method

instantiate

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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 256
      def instantiate(attributes, column_types = {}, &block)
        klass = discriminate_class_for_record(attributes)
        instantiate_instance_of(klass, attributes, column_types, &block)
      end

instantiate

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