Class: RailsAdmin::Config::LazyModel

Inherits:
BasicObject
Defined in:
lib/rails_admin/config/lazy_model.rb

Instance Method Summary collapse

Constructor Details

#initialize(entity, &block) ⇒ LazyModel

Returns a new instance of LazyModel.



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# File 'lib/rails_admin/config/lazy_model.rb', line 6

def initialize(entity, &block)
  @entity = entity
  @deferred_blocks = [*block]
  @existing_blocks = []
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, &block) ⇒ Object 



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# File 'lib/rails_admin/config/lazy_model.rb', line 59

def method_missing(method, *args, &block)
  target.send(method, *args, &block)
end

Instance Method Details

#add_deferred_block(&block) ⇒ Object 



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# File 'lib/rails_admin/config/lazy_model.rb', line 12

def add_deferred_block(&block)
  @deferred_blocks << block
end

#respond_to?(method, include_private = false) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rails_admin/config/lazy_model.rb', line 63

def respond_to?(method, include_private = false)
  super || target.respond_to?(method, include_private)
end

#target ⇒ Object 



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# File 'lib/rails_admin/config/lazy_model.rb', line 16

def target
  @model ||= ::RailsAdmin::Config::Model.new(@entity)
  # When evaluating multiple configuration blocks, the order of
  # execution is important. As one would expect (in my opinion),
  # options defined within a resource should take precedence over
  # more general options defined in an initializer. This way,
  # general settings for a number of resources could be specified
  # in the initializer, while models could override these settings
  # later, if required.
  #
  # CAVEAT: It cannot be guaranteed that blocks defined in an initializer
  # will be loaded (and adde to @deferred_blocks) first. For instance, if
  # the initializer references a model class before defining
  # a RailsAdmin configuration block, the configuration from the
  # resource will get added to @deferred_blocks first:
  #
  #     # app/models/some_model.rb
  #     class SomeModel
  #       rails_admin do
  #         :
  #       end
  #     end
  #
  #     # config/initializers/rails_admin.rb
  #     model = 'SomeModel'.constantize # blocks from SomeModel get loaded
  #     model.config model do           # blocks from initializer gets loaded
  #       :
  #     end
  #
  # Thus, sort all blocks to excute for a resource by Proc.source_path,
  # to guarantee that blocks from 'config/initializers' evaluate before
  # blocks defined within a model class.
  unless @deferred_blocks.empty?
    @existing_blocks += @deferred_blocks
    @existing_blocks.
      partition { |block| block.source_location.first =~ %r{config\/initializers} }.
      flatten.
      each { |block| @model.instance_eval(&block) }
    @deferred_blocks = []
  end
  @model
end