method

instantiate

Ruby on Rails latest stable (v7.1.3.2) - 0 notes - Class: ClassMethods

1.0.0
1.1.6
1.2.6
2.0.3
2.1.0
2.2.1
2.3.8
3.0.0
3.0.9
3.1.0
3.2.1
3.2.8
3.2.13
4.0.2 (0)
4.1.8 (38)
4.2.1 (0)
4.2.7 (0)
4.2.9 (0)
5.0.0.1 (9)
5.1.7 (0)
5.2.3 (0)
6.0.0 (0)
6.1.3.1 (0)
6.1.7.7 (0)
7.0.0 (0)
7.1.3.2 (0)
7.1.3.4 (0)
What's this?

instantiate(attributes, column_types = {}, &block) public

Given an attributes hash, instantiate returns a new instance of the appropriate class. Accepts only keys as strings.

For example, Post.all may return Comments, Messages, and Emails by storing the record’s subclass in a type attribute. By calling instantiate instead of new, finder methods ensure they get new instances of the appropriate class for each record.

See ActiveRecord::Inheritance#discriminate_class_for_record to see how this “single-table” inheritance mapping is implemented.

Show source

# File activerecord/lib/active_record/persistence.rb, line 376
      def instantiate(attributes, column_types = {}, &block)
        klass = discriminate_class_for_record(attributes)
        instantiate_instance_of(klass, attributes, column_types, &block)
      end

instantiate

Related methods