Module: HasDraft::ClassMethods

Defined in:
lib/has_draft.rb

Instance Method Summary collapse

Instance Method Details

#draft_class ⇒ Object 



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# File 'lib/has_draft.rb', line 51

def draft_class
  const_get(draft_class_name)
end

#has_draft(options = {}, &block) ⇒ Object 



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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}"

  # Default parent association
  options[:belongs_to] = self.to_s.demodulize.underscore.to_sym if options[:belongs_to].nil?

  # Create Relationship to Draft Copy
  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

  # Default parent class to ActiveRecord::Base
  options[:extends] = ActiveRecord::Base if options[:extends].nil?

  # Dynamically Create Model::Draft Class
  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 Parent Association
  draft_class.belongs_to options[:belongs_to], :class_name  => "::#{self.to_s}", :foreign_key => draft_foreign_key, :inverse_of => :draft

  # Block extension
  draft_class.class_eval(&block) if block_given?
  
  # Finally setup which columns to draft
  self.draft_columns = draft_class.new.attributes.keys - [draft_class.primary_key, draft_foreign_key, 'created_at', 'updated_at', inheritance_column]
end