Module: Cms::Behaviors::DynamicAttributes::MacroMethods

Defined in:
lib/cms/behaviors/dynamic_attributes.rb

Instance Method Summary collapse

Instance Method Details

#has_dynamic_attributes(options = {}) ⇒ Object

Will make the current class have dynamic attributes.



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# File 'lib/cms/behaviors/dynamic_attributes.rb', line 125

def has_dynamic_attributes(options={})
  @has_dynamic_attributes = true
  include InstanceMethods

  # Provide default options
  options[:class_name] ||= self.class_name + 'Attribute'
  options[:table_name] ||= options[:class_name].tableize
  options[:relationship_name] ||= options[:class_name].tableize.to_sym
  options[:foreign_key] ||= self.class_name.foreign_key
  options[:base_foreign_key] ||= self.name.underscore.foreign_key
  options[:name_field] ||= 'name'
  options[:value_field] ||= 'value'
  options[:fields].collect! {|f| f.to_s} unless options[:fields].nil?

  # Init option storage if necessary
  cattr_accessor :dynamic_options
  self.dynamic_options ||= Hash.new

  # Return if already processed.
  return if self.dynamic_options.keys.include? options[:class_name]

  # Attempt to load related class. If not create it
  begin
    options[:class_name].constantize
  rescue
    Object.const_set(options[:class_name],
      Class.new(ActiveRecord::Base)).class_eval do
      def self.reloadable? #:nodoc:
        false
      end
    end
  end

  # Store options
  self.dynamic_options[options[:class_name]] = options

  # Modify attribute class
  attribute_class = options[:class_name].constantize
  base_class = self.name.underscore.to_sym
  attribute_class.class_eval do
    belongs_to base_class, :foreign_key => options[:base_foreign_key]
    alias_method :base, base_class # For generic access
  end

  # Modify main class
  class_eval do
    has_many options[:relationship_name],
      :class_name => options[:class_name],
      :table_name => options[:table_name],
      :foreign_key => options[:foreign_key],
      :dependent => :destroy

    # The following is only setup once
    unless private_method_defined? :method_missing_without_dynamic_attributes

      # Carry out delayed actions before save
      after_validation_on_update :save_modified_dynamic_attributes

      # Make attributes seem real
      alias_method :method_missing_without_dynamic_attributes, :method_missing
      alias_method :method_missing, :method_missing_with_dynamic_attributes

      private

      alias_method :read_attribute_without_dynamic_attributes, :read_attribute
      alias_method :read_attribute, :read_attribute_with_dynamic_attributes
      alias_method :write_attribute_without_dynamic_attributes, :write_attribute
      alias_method :write_attribute, :write_attribute_with_dynamic_attributes

    end
  end
end

#has_dynamic_attributes? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cms/behaviors/dynamic_attributes.rb', line 120

def has_dynamic_attributes?
  !!@has_dynamic_attributes
end