所以这可能有点令人困惑，但请耐心等待。简而言之，我想遍历具有特定键值的所有属性，然后在值不为空的情况下将它们插入模板。这是我的代码：

属性：

# === Default file Configurations
#
default['elasticsearch']['default']['ES_USER']              = ''
default['elasticsearch']['default']['ES_GROUP']             = ''
default['elasticsearch']['default']['ES_HEAP_SIZE']         = ''
default['elasticsearch']['default']['MAX_OPEN_FILES']       = ''
default['elasticsearch']['default']['MAX_LOCKED_MEMORY']    = 'unlimited'
default['elasticsearch']['default']['MAX_MAP_COUNT']        = ''
default['elasticsearch']['default']['LOG_DIR']              = '/var/log/elasticsearch'
default['elasticsearch']['default']['DATA_DIR']             = '/var/lib/elasticsearch'
default['elasticsearch']['default']['WORK_DIR']             = '/tmp/elasticsearch'
default['elasticsearch']['default']['CONF_DIR']             = '/etc/elasticsearch'
default['elasticsearch']['default']['CONF_FILE']            = '/etc/elasticsearch/elasticsearch.yml'
default['elasticsearch']['default']['RESTART_ON_UPGRADE']   = ''

模板：

<% node['elasticsearch']['default'].each do |host| -%>
    <% if node.elasticsearch.default.host not nil -%>
        <%= host %>=<%= node.elasticsearch.default.host %>
<% end %>

输出（希望）：

MAX_LOCKED_MEMORY=unlimited
LOG_DIR=/var/log/elasticsearch
DATA_DIR=/var/lib/elasticsearch
WORK_DIR=/tmp/elasticsearch
CONF_DIR=/etc/elasticsearch
CONF_FILE=/etc/elasticsearch/elasticsearch.yml

我的红宝石并不是最好的，因为我只是从所有这些东西开始，但是我找不到这种情况的任何例子。任何帮助将是巨大的，谢谢。