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# File 'lib/has_draft.rb', line 7
def has_draft(options = {}, &block)
return if self.included_modules.include?(HasDraft::InstanceMethods)
include HasDraft::InstanceMethods
cattr_accessor :draft_class_name, :draft_foreign_key, :draft_table_name, :draft_columns
self.draft_class_name = options[:class_name] || 'Draft'
self.draft_foreign_key = options[:foreign_key] || self.to_s.foreign_key
self.draft_table_name = options[:table_name] || "#{table_name_prefix}#{base_class.name.demodulize.underscore}_drafts#{table_name_suffix}"
options[:belongs_to] = self.to_s.demodulize.underscore.to_sym if options[:belongs_to].nil?
class_eval do
has_one :draft, :class_name => "#{self.to_s}::#{draft_class_name}",
:foreign_key => draft_foreign_key,
:dependent => :destroy,
:inverse_of => options[:belongs_to]
scope :with_draft, lambda { includes(:draft).where("#{draft_table_name}.id IS NOT NULL") }
scope :without_draft, lambda { includes(:draft).where("#{draft_table_name}.id IS NULL") }
end
options[:extends] = ActiveRecord::Base if options[:extends].nil?
const_set(draft_class_name, Class.new(options[:extends]))
draft_class.cattr_accessor :original_class
draft_class.original_class = self
draft_class.table_name = draft_table_name
draft_class.belongs_to options[:belongs_to], :class_name => "::#{self.to_s}", :foreign_key => draft_foreign_key, :inverse_of => :draft
draft_class.class_eval(&block) if block_given?
self.draft_columns = draft_class.new.attributes.keys - [draft_class.primary_key, draft_foreign_key, 'created_at', 'updated_at', inheritance_column]
end
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