method
to_key
v5.0.0.1 -
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Class: ActiveModel::Conversion
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to_key()
public
Returns an Array of all key attributes if any of the attributes is set, whether or not the object is persisted. 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]