Module: AnafHabtm::ActiveRecord

Defined in:
lib/anaf_active_record.rb

Instance Method Summary collapse

Instance Method Details

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



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# File 'lib/anaf_active_record.rb', line 4

def anaf_habtm(association, options={}, &block)
  class_eval do
    # Define a proc that will look up the (potentially) existing object
    finder = proc {|id| association.to_s.singularize.camelize.constantize.where(:id=>id).first
    }

    # Define a proc that will set the association collection
    set_collection = proc {|me, coll| me.send("#{association.to_s.tableize}=", coll)}
    has_and_belongs_to_many association.to_sym, options
    # Define the actual association setter.
    define_method "#{association.to_s.tableize}_attributes=", lambda{|attributes_for_association|
      coll = []

      attributes_for_association.each_value do |params|
        next if params["_destroy"] == "1"
        obj = finder.call(params["id"]) if params.has_key?("id")
        params.extend(AnafHabtm::HashExtension)
        # ActiveRecord::Base.attributes=() doesn't like extra parameters.
        coll << block.call(params.copy_without_destroy, obj)
      end
      set_collection.call(self, coll)
    }
  end
end

#named_association(member, attribute, opts = {}) ⇒ Object 



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# File 'lib/anaf_active_record.rb', line 29

def named_association(member, attribute, opts={})
  member = member.to_s
  klass = opts.has_key?(:class) ? opts[:class_name] : member.to_s.singularize.camelize
  attribute = attribute.to_s
  if opts.has_key?(:create)
    class_eval "def #{member}_#{attribute}=(#{attribute});
    return if #{attribute}.blank?
    self.#{member} = #{klass}.find_or_create_by_#{attribute}(#{attribute})
    end;"
  else
    class_eval "def #{member}_#{attribute}=(#{attribute}); self.#{member} = #{klass}.find_by_#{attribute}(#{attribute}) unless #{attribute}.blank?; end;"
  end
  class_eval "def #{member}_#{attribute}; #{member}.#{attribute} if #{member}; end;"
end