method

method_missing

Ruby on Rails latest stable (v6.1.7.7) - 0 notes - Class: ActiveRecord::Base

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What's this?

Method deprecated or moved

This method is deprecated or moved on the latest stable version. The last existing version (v3.1.0) is shown here.

These similar methods exist in v6.1.7.7:

method_missing(method_id, *arguments, &block) private

Enables dynamic finders like User.find_by_user_name(user_name) and <tt>User.scoped_by_user_name(user_name). Refer to Dynamic attribute-based finders section at the top of this file for more detailed information.

It’s even possible to use all the additional parameters to find. For example, the full interface for find_all_by_amount is actually find_all_by_amount(amount, options).

Each dynamic finder using scoped_by_* is also defined in the class after it is first invoked, so that future attempts to use it do not run through method_missing.

Show source

# File activerecord/lib/active_record/base.rb, line 1045
        def method_missing(method_id, *arguments, &block)
          if match = DynamicFinderMatch.match(method_id)
            attribute_names = match.attribute_names
            super unless all_attributes_exists?(attribute_names)
            if !arguments.first.is_a?(Hash) && arguments.size < attribute_names.size
              ActiveSupport::Deprecation.warn(Calling dynamic finder with less number of arguments than the number of attributes in method name is deprecated and will raise an ArguementError in the next version of Rails. Please passing `nil' to the argument you want it to be nil.)
            end
            if match.finder?
              options = arguments.extract_options!
              relation = options.any? ? scoped(options) : scoped
              relation.send :find_by_attributes, match, attribute_names, *arguments
            elsif match.instantiator?
              scoped.send :find_or_instantiator_by_attributes, match, attribute_names, *arguments, &block
            end
          elsif match = DynamicScopeMatch.match(method_id)
            attribute_names = match.attribute_names
            super unless all_attributes_exists?(attribute_names)
            if arguments.size < attribute_names.size
              ActiveSupport::Deprecation.warn(
                "Calling dynamic scope with less number of arguments than the number of attributes in "                  "method name is deprecated and will raise an ArguementError in the next version of Rails. "                  "Please passing `nil' to the argument you want it to be nil."
              )
            end
            if match.scope?
              self.class_eval                 def self.#{method_id}(*args)                                    # def self.scoped_by_user_name_and_password(*args)                  attributes = Hash[[:#{attribute_names.join(',:')}].zip(args)] #   attributes = Hash[[:user_name, :password].zip(args)]                                                                                #                  scoped(:conditions => attributes)                             #   scoped(:conditions => attributes)                end                                                             # end, __FILE__, __LINE__ + 1
              send(method_id, *arguments)
            end
          else
            super
          end
        end

method_missing

Related methods

Method deprecated or moved

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