# File lib/dragonfly/active_model_extensions/attachment_class_methods.rb, line 64
        def init(model_class, attribute, app, config_block)
          @model_class, @attribute, @app, @config_block = model_class, attribute, app, config_block
          include app.analyser.analysis_methods
          include app.job_definitions
          define_method :format do
            job.format
          end
          define_method :mime_type do
            job.mime_type
          end
          ConfigProxy.new(self, config_block) if config_block
          self
        end