Method: ActiveModel::Lint::Tests#test_to_param

Defined in:

lib/active_model/lint.rb

#test_to_param ⇒ Object

Passes if the object’s model responds to to_param and if calling this method returns nil when the object is not persisted. Fails otherwise.

to_param is used to represent the object’s key in URLs. Implementers can decide to either raise an exception or provide a default in case the record uses a composite primary key. There are no tests for this behavior in lint because it doesn’t make sense to force any of the possible implementation strategies on the implementer.

# File 'lib/active_model/lint.rb', line 46

def test_to_param
  assert_respond_to model, :to_param
  def_method(model, :to_key) { [1] }
  def_method(model, :persisted?) { false }
  assert model.to_param.nil?, "to_param should return nil when `persisted?` returns false"
end