Contents

# AnafHabtm

module ActiveRecordExtensions
  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(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
  
  def named_association(member, klass, attribute, create=nil)
    member = member.to_s
    klass = klass.name
    attribute = attribute.to_s
    if 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
    
  
end

Version data entries

7 entries across 7 versions & 1 rubygems

Version	Path
anaf_habtm-0.0.7	lib/active_record_extensions.rb
anaf_habtm-0.0.6	lib/active_record_extensions.rb
anaf_habtm-0.0.5	lib/active_record_extensions.rb
anaf_habtm-0.0.4	lib/active_record_extensions.rb
anaf_habtm-0.0.3	lib/active_record_extensions.rb
anaf_habtm-0.0.2	lib/active_record_extensions.rb
anaf_habtm-0.0.1	lib/active_record_extensions.rb