method
to_key
v4.2.9 -
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Class: ActiveModel::Conversion
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to_key()
public
Returns an Array of all key attributes if any is set, regardless if the object is persisted or not. Returns nil if there are no key attributes.
class Person include ActiveModel::Conversion attr_accessor :id end person = Person.create(id: 1) person.to_key # => [1]