Python django.apps.apps 模块，get_models() 实例源码

def _from_view_models(self):
        if hasattr(self._view_meta, "from_view_models"):
            return self._view_meta.from_view_models
        tables = {
            model._meta.db_table: model for model in apps.get_models()
        }
        from_models = self._view_meta.from_models
        from_view_models = set()
        for label in from_models:
            if "." in label:
                app_label, model_name = label.split(".")
                model = apps.get_model(app_label=app_label, model_name=model_name)
                if issubclass(model, View):
                    from_view_models.add(model)
            else:
                model = tables[label]
                if issubclass(model, View):
                    from_view_models.add(model)
        setattr(self._view_meta, "from_view_models", from_view_models)
        return from_view_models

def handle(self, *args, **options):
        validate = options.get('validate', False)
        force = options.get('force', False)
        app_config = apps.get_app_config('postgresviews')
        tables = {
            model._meta.db_table: model for model in apps.get_models()
        }

        for model in ViewBase.view_models:
            app_config.validate_view_model(model, tables)

        if validate:
            return

        if force:
            drop_views()

        create_views()

def check_all_models(app_configs=None, **kwargs):
    errors = []
    for model in apps.get_models():
        if app_configs is None or model._meta.app_config in app_configs:
            if not inspect.ismethod(model.check):
                errors.append(
                    Error(
                        "The '%s.check()' class method is "
                        "currently overridden by %r." % (
                            model.__name__, model.check),
                        hint=None,
                        obj=model,
                        id='models.E020'
                    )
                )
            else:
                errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def check_all_models(app_configs=None, **kwargs):
    errors = []
    if app_configs is None:
        models = apps.get_models()
    else:
        models = chain.from_iterable(app_config.get_models() for app_config in app_configs)
    for model in models:
        if not inspect.ismethod(model.check):
            errors.append(
                Error(
                    "The '%s.check()' class method is currently overridden by %r."
                    % (model.__name__, model.check),
                    obj=model,
                    id='models.E020'
                )
            )
        else:
            errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def check_all_models(app_configs=None, **kwargs):
    errors = []
    if app_configs is None:
        models = apps.get_models()
    else:
        models = chain.from_iterable(app_config.get_models() for app_config in app_configs)
    for model in models:
        if not inspect.ismethod(model.check):
            errors.append(
                Error(
                    "The '%s.check()' class method is currently overridden by %r."
                    % (model.__name__, model.check),
                    obj=model,
                    id='models.E020'
                )
            )
        else:
            errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def check_all_models(app_configs=None, **kwargs):
    errors = []
    if app_configs is None:
        models = apps.get_models()
    else:
        models = chain.from_iterable(app_config.get_models() for app_config in app_configs)
    for model in models:
        if not inspect.ismethod(model.check):
            errors.append(
                Error(
                    "The '%s.check()' class method is currently overridden by %r."
                    % (model.__name__, model.check),
                    obj=model,
                    id='models.E020'
                )
            )
        else:
            errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def handle(self, *args, **options):
        page_photos = PagePhoto.objects.filter(instance_id=0)
        if page_photos.exists():
            self.stdout.write('Deleting %s PagePhoto without instance' % page_photos.count())
            page_photos.delete()

        page_files = PageFile.objects.filter(instance_id=0)
        if page_files.exists():
            self.stdout.write('Deleting %s PageFiles without instance' % page_files.count())
            page_files.delete()

        simple_photos = SimplePhoto.objects.filter(instance_id=0)
        if simple_photos.exists():
            self.stdout.write('Deleting %s SimplePhoto without instance' % simple_photos.count())
            simple_photos.delete()

        for app in self.get_apps():
            for model in apps.get_models(app):
                if not model._meta.managed:
                    continue

                self.process_model(app, model)

        self.stdout.write('Done')

def check_all_models(app_configs=None, **kwargs):
    errors = []
    if app_configs is None:
        models = apps.get_models()
    else:
        models = chain.from_iterable(app_config.get_models() for app_config in app_configs)
    for model in models:
        if not inspect.ismethod(model.check):
            errors.append(
                Error(
                    "The '%s.check()' class method is currently overridden by %r."
                    % (model.__name__, model.check),
                    obj=model,
                    id='models.E020'
                )
            )
        else:
            errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def check_all_models(app_configs=None, **kwargs):
    errors = []
    for model in apps.get_models():
        if app_configs is None or model._meta.app_config in app_configs:
            if not inspect.ismethod(model.check):
                errors.append(
                    Error(
                        "The '%s.check()' class method is "
                        "currently overridden by %r." % (
                            model.__name__, model.check),
                        hint=None,
                        obj=model,
                        id='models.E020'
                    )
                )
            else:
                errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def check_all_models(app_configs=None, **kwargs):
    errors = []
    for model in apps.get_models():
        if app_configs is None or model._meta.app_config in app_configs:
            if not inspect.ismethod(model.check):
                errors.append(
                    Error(
                        "The '%s.check()' class method is "
                        "currently overridden by %r." % (
                            model.__name__, model.check),
                        hint=None,
                        obj=model,
                        id='models.E020'
                    )
                )
            else:
                errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def check_all_models(app_configs=None, **kwargs):
    errors = []
    for model in apps.get_models():
        if app_configs is None or model._meta.app_config in app_configs:
            if not inspect.ismethod(model.check):
                errors.append(
                    Error(
                        "The '%s.check()' class method is "
                        "currently overridden by %r." % (
                            model.__name__, model.check),
                        hint=None,
                        obj=model,
                        id='models.E020'
                    )
                )
            else:
                errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def check_all_models(app_configs=None, **kwargs):
    errors = []
    for model in apps.get_models():
        if app_configs is None or model._meta.app_config in app_configs:
            if not inspect.ismethod(model.check):
                errors.append(
                    Error(
                        "The '%s.check()' class method is "
                        "currently overridden by %r." % (
                            model.__name__, model.check),
                        hint=None,
                        obj=model,
                        id='models.E020'
                    )
                )
            else:
                errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def check_all_models(app_configs=None, **kwargs):
    errors = []
    for model in apps.get_models():
        if app_configs is None or model._meta.app_config in app_configs:
            if not inspect.ismethod(model.check):
                errors.append(
                    Error(
                        "The '%s.check()' class method is "
                        "currently overridden by %r." % (
                            model.__name__, model.check),
                        hint=None,
                        obj=model,
                        id='models.E020'
                    )
                )
            else:
                errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def check_all_models(app_configs=None, **kwargs):
    errors = []
    if app_configs is None:
        models = apps.get_models()
    else:
        models = chain.from_iterable(app_config.get_models() for app_config in app_configs)
    for model in models:
        if not inspect.ismethod(model.check):
            errors.append(
                Error(
                    "The '%s.check()' class method is currently overridden by %r."
                    % (model.__name__, model.check),
                    obj=model,
                    id='models.E020'
                )
            )
        else:
            errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def check_all_models(app_configs=None, **kwargs):
    errors = []
    if app_configs is None:
        models = apps.get_models()
    else:
        models = chain.from_iterable(app_config.get_models() for app_config in app_configs)
    for model in models:
        if not inspect.ismethod(model.check):
            errors.append(
                Error(
                    "The '%s.check()' class method is currently overridden by %r."
                    % (model.__name__, model.check),
                    obj=model,
                    id='models.E020'
                )
            )
        else:
            errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def handle_noargs(self, *args, **options):
        verbosity = int(options.get('verbosity'))
        for model in apps.get_models():
            if hasattr(model, 'add_missing_placeholders'):
                if verbosity:
                    self.stdout.write('Adding placeholders for %s "%s"...' % (
                        model.objects.count(),
                        force_text(model._meta.verbose_name_plural).title(),
                    ))
                ok = updated = 0
                for obj in model.objects.all():
                    if obj.add_missing_placeholders():
                        updated += 1
                    else:
                        ok += 1
                if verbosity:
                    self.stdout.write('%s updated, %s OK' % (updated, ok))

def check_all_models(app_configs=None, **kwargs):
    errors = []
    if app_configs is None:
        models = apps.get_models()
    else:
        models = chain.from_iterable(app_config.get_models() for app_config in app_configs)
    for model in models:
        if not inspect.ismethod(model.check):
            errors.append(
                Error(
                    "The '%s.check()' class method is currently overridden by %r."
                    % (model.__name__, model.check),
                    obj=model,
                    id='models.E020'
                )
            )
        else:
            errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def check_all_models(app_configs=None, **kwargs):
    errors = []
    if app_configs is None:
        models = apps.get_models()
    else:
        models = chain.from_iterable(app_config.get_models() for app_config in app_configs)
    for model in models:
        if not inspect.ismethod(model.check):
            errors.append(
                Error(
                    "The '%s.check()' class method is currently overridden by %r."
                    % (model.__name__, model.check),
                    obj=model,
                    id='models.E020'
                )
            )
        else:
            errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def ready(self):
        for db in settings.DATABASES:
            name = db['NAME']
            db_wrapper_class = import_string(db['ENGINE'] + '.base.DatabaseWrapper')
            base_model = getattr(db_wrapper_class, 'base_model', None)
            if base_model:
                models = apps.get_models()
                for model in models:
                    if name == router.db_for_read(model):
                        for k, v in base_model.__dict__:
                            if k == 'objects':
                                model_manager = getattr(model, 'objects', None)
                                if model_manager:
                                    manager_cls = model_manager.__class__
                                    custom_cls = v.__class__
                                    new_manager = type('AnyBackendCustomManager', (custom_cls, manager_cls), {})
                                    setattr(model, 'objects', new_manager())
                                else:
                                    setattr(model, 'objects', v)
                            elif not k.startswith('__'):
                                setattr(model, k ,v)

def check_all_models(app_configs=None, **kwargs):
    errors = []
    for model in apps.get_models():
        if app_configs is None or model._meta.app_config in app_configs:
            if not inspect.ismethod(model.check):
                errors.append(
                    Error(
                        "The '%s.check()' class method is "
                        "currently overridden by %r." % (
                            model.__name__, model.check),
                        hint=None,
                        obj=model,
                        id='models.E020'
                    )
                )
            else:
                errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def check_all_models(app_configs=None, **kwargs):
    errors = []
    if app_configs is None:
        models = apps.get_models()
    else:
        models = chain.from_iterable(app_config.get_models() for app_config in app_configs)
    for model in models:
        if not inspect.ismethod(model.check):
            errors.append(
                Error(
                    "The '%s.check()' class method is currently overridden by %r."
                    % (model.__name__, model.check),
                    obj=model,
                    id='models.E020'
                )
            )
        else:
            errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def check_all_models(app_configs=None, **kwargs):
    errors = []
    for model in apps.get_models():
        if app_configs is None or model._meta.app_config in app_configs:
            if not inspect.ismethod(model.check):
                errors.append(
                    Error(
                        "The '%s.check()' class method is "
                        "currently overridden by %r." % (
                            model.__name__, model.check),
                        hint=None,
                        obj=model,
                        id='models.E020'
                    )
                )
            else:
                errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def check_all_models(app_configs=None, **kwargs):
    errors = []
    for model in apps.get_models():
        if app_configs is None or model._meta.app_config in app_configs:
            if not inspect.ismethod(model.check):
                errors.append(
                    Error(
                        "The '%s.check()' class method is "
                        "currently overridden by %r." % (
                            model.__name__, model.check),
                        hint=None,
                        obj=model,
                        id='models.E020'
                    )
                )
            else:
                errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def apps_view(request, pk):
    boite = get_object_or_404(Boite, pk=pk, user=request.user)

    # update apps data
    boite.get_apps_dictionary()

    apps_list = []
    enabled_apps = 0
    for model in apps.get_models():
        if issubclass(model, App):
            app_instances = model.objects.filter(boite=boite)
            pk = None
            enabled = None

            if app_instances:
                first_app = app_instances.first()
                pk = first_app.pk
                enabled = first_app.enabled
                enabled_apps += 1

            verbose_name =  model._meta.verbose_name.title()
            apps_list.append({'verbose_name':verbose_name[16:], 'pk':pk, 'enabled':enabled, 'app_label': model._meta.app_label, 'instance': app_instances.first()})

    return render(request, 'boites/boite_apps.html', {'boite': boite, 'boite_id': boite.id, 'apps': apps_list, 'show_create_button' : len(apps_list) > enabled_apps})

def check_all_models(app_configs=None, **kwargs):
    errors = []
    if app_configs is None:
        models = apps.get_models()
    else:
        models = chain.from_iterable(app_config.get_models() for app_config in app_configs)
    for model in models:
        if not inspect.ismethod(model.check):
            errors.append(
                Error(
                    "The '%s.check()' class method is currently overridden by %r."
                    % (model.__name__, model.check),
                    obj=model,
                    id='models.E020'
                )
            )
        else:
            errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def check_all_models(app_configs=None, **kwargs):
    errors = []
    if app_configs is None:
        models = apps.get_models()
    else:
        models = chain.from_iterable(app_config.get_models() for app_config in app_configs)
    for model in models:
        if not inspect.ismethod(model.check):
            errors.append(
                Error(
                    "The '%s.check()' class method is currently overridden by %r."
                    % (model.__name__, model.check),
                    obj=model,
                    id='models.E020'
                )
            )
        else:
            errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def check_all_models(app_configs=None, **kwargs):
    errors = []
    if app_configs is None:
        models = apps.get_models()
    else:
        models = chain.from_iterable(app_config.get_models() for app_config in app_configs)
    for model in models:
        if not inspect.ismethod(model.check):
            errors.append(
                Error(
                    "The '%s.check()' class method is currently overridden by %r."
                    % (model.__name__, model.check),
                    obj=model,
                    id='models.E020'
                )
            )
        else:
            errors.extend(model.check(**kwargs))
    return errors

def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = apps.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.model_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3:
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

def _get_models(apps, stack):
    """
    If we are in a migration operation, we need to look in that for models.
    We really only should be injecting ourselves if we find a frame that contains
    a database_(forwards|backwards) function.
    Otherwise, we can look in the `apps` object passed in.
    """
    for frame in stack:
        frame_locals = frame[0].f_locals
        if frame[3] == 'database_forwards' and all(
            local in frame_locals for local in ('from_state', 'to_state', 'schema_editor', 'self')
        ) and isinstance(frame_locals['self'], Operation):
            # Should this be from_state, or to_state, or should we look in both?
            from_state = frame_locals['from_state']
            to_state = frame_locals['to_state']
            models = set()
            if to_state.apps:
                models = models.union(to_state.apps.get_models())
            if from_state.apps:
                models = models.union(from_state.apps.get_models())
            return models

    return apps.get_models()

def check_all_models(app_configs=None, **kwargs):
    errors = []
    for model in apps.get_models():
        if app_configs is None or model._meta.app_config in app_configs:
            if not inspect.ismethod(model.check):
                errors.append(
                    Error(
                        "The '%s.check()' class method is "
                        "currently overridden by %r." % (
                            model.__name__, model.check),
                        hint=None,
                        obj=model,
                        id='models.E020'
                    )
                )
            else:
                errors.extend(model.check(**kwargs))
    return errors