method
instantiate
v6.1.3.1 -
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- Class:
ActiveRecord::Persistence::ClassMethods
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.
