method

method_missing

v2.2.1 - Show latest stable - 0 notes - Class: ActiveRecord::AttributeMethods

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What's this?

method_missing(method_id, *args, &block) public

Allows access to the object attributes, which are held in the @attributes hash, as though they were first-class methods. So a Person class with a name attribute can use Person#name and Person#name= and never directly use the attributes hash — except for multiple assigns with ActiveRecord#attributes=. A Milestone class can also ask Milestone#completed? to test that the completed attribute is not nil or 0.

It’s also possible to instantiate related objects, so a Client class belonging to the clients table with a master_id foreign key can instantiate master through Client#master.

Show source

# File activerecord/lib/active_record/attribute_methods.rb, line 234
    def method_missing(method_id, *args, &block)
      method_name = method_id.to_s

      if self.class.private_method_defined?(method_name)
        raise NoMethodError.new("Attempt to call private method", method_name, args)
      end

      # If we haven't generated any methods yet, generate them, then
      # see if we've created the method we're looking for.
      if !self.class.generated_methods?
        self.class.define_attribute_methods
        if self.class.generated_methods.include?(method_name)
          return self.send(method_id, *args, &block)
        end
      end
      
      if self.class.primary_key.to_s == method_name
        id
      elsif md = self.class.match_attribute_method?(method_name)
        attribute_name, method_type = md.pre_match, md.to_s
        if @attributes.include?(attribute_name)
          __send__("attribute#{method_type}", attribute_name, *args, &block)
        else
          super
        end
      elsif @attributes.include?(method_name)
        read_attribute(method_name)
      else
        super
      end
    end

method_missing

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