Module: ForeignModel::ClassMethods

Defined in:
lib/foreign_model.rb

Instance Method Summary collapse

Instance Method Details

#belongs_to_foreign_model(name, options = {}) ⇒ Object 



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# File 'lib/foreign_model.rb', line 14

def belongs_to_foreign_model(name, options={})
  options[:class_name] ||= ForeignModel.camelize(name.to_s)
  
  ForeignModel::SCOPE_PROCS[self][name.to_s] = begin
    if options[:scope]
      options[:scope]
    elsif options[:polymorphic]
      proc do |r|
        type = r.send("#{name}_type")
        type and eval(type)
      end
    else
      #TODO: this is a hack
      proc{ eval(options[:class_name]) }
    end
  end
    
  class_eval %`
    def parent_proc_for_#{name}
      @parent_proc_for_#{name} ||= begin
        ForeignModel::SCOPE_PROCS[self.class]["#{name}"].call(self)
      end
    end
    
    def #{name}
      @#{name} ||= parent_proc_for_#{name}.find(#{name}_id) if parent_proc_for_#{name} && #{name}_id 
    end

    def #{name}=(foreign_model)
      @#{name} = foreign_model
      if foreign_model
        send('#{name}_id=', foreign_model.id)
        send('#{name}_type=', foreign_model.class.name) if respond_to? '#{name}_type='
      end
    end

    def #{name}_id=(foreign_model_id)
      if #{name}_id != foreign_model_id
        write_raw_attribute("#{name}_id", foreign_model_id)
        @#{name} = nil
      end
    end
  `
  
  if options[:polymorphic]
    class_eval %`  
      def #{name}_type=(foreign_model_type)
        if #{name}_type != foreign_model_type
          write_raw_attribute("#{name}_type", foreign_model_type)
          @#{name} = nil
        end
      end
    `
  end
end