class Mapping < ActiveRecord::Base scope :topicmapping, -> { where(mappable_type: :Topic) } scope :synapsemapping, -> { where(mappable_type: :Synapse) } belongs_to :mappable, polymorphic: true belongs_to :map, :class_name => "Map", :foreign_key => "map_id", touch: true belongs_to :user validates :xloc, presence: true, unless: Proc.new { |m| m.mappable_type == 'Synapse' } validates :yloc, presence: true, unless: Proc.new { |m| m.mappable_type == 'Synapse' } validates :map, presence: true validates :mappable, presence: true def user_name self.user.name end def user_image self.user.image.url end def as_json(options={}) super(:methods =>[:user_name, :user_image]) end end