Active Model Lint Tests
You can test whether an object is compliant with the Active Model API
by including ActiveModel::Lint::Tests
in your TestCase. It will include tests that tell you whether your object is fully compliant, or if not, which aspects of the API
are not implemented.
Note an object is not required to implement all APIs in order to work with Action Pack. This module only intends to provide guidance in case you want all features out of the box.
These tests do not attempt to determine the semantic correctness of the returned values. For instance, you could implement valid?
to always return true
, and the tests would pass. It is up to you to ensure that the values are semantically meaningful.
Objects you pass in are expected to return a compliant object from a call to to_model
. It is perfectly fine for to_model
to return self
.
- T
Instance Public methods
test_errors_aref() Link
Passes if the object’s model responds to errors
and if calling [](attribute)
on the result of this method returns an array. Fails otherwise.
errors[attribute]
is used to retrieve the errors of a model for a given attribute. If errors are present, the method should return an array of strings that are the errors for the attribute in question. If localization is used, the strings should be localized for the current locale. If no error is present, the method should return an empty array.
test_model_naming() Link
Passes if the object’s model responds to model_name
both as an instance method and as a class method, and if calling this method returns a string with some convenience methods: :human
, :singular
and :plural
.
Check ActiveModel::Naming
for more information.
# File activemodel/lib/active_model/lint.rb, line 81 def test_model_naming assert_respond_to model.class, :model_name model_name = model.class.model_name assert_respond_to model_name, :to_str assert_respond_to model_name.human, :to_str assert_respond_to model_name.singular, :to_str assert_respond_to model_name.plural, :to_str assert_respond_to model, :model_name assert_equal model.model_name, model.class.model_name end
test_persisted?() Link
Passes if the object’s model responds to persisted?
and if calling this method returns either true
or false
. Fails otherwise.
persisted?
is used when calculating the URL for an object. If the object is not persisted, a form for that object, for instance, will route to the create action. If it is persisted, a form for the object will route to the update action.
test_to_key() Link
Passes if the object’s model responds to to_key
and if calling this method returns nil
when the object is not persisted. Fails otherwise.
to_key
returns an Enumerable
of all (primary) key attributes of the model, and is used to a generate unique DOM id for the object.
test_to_param() Link
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.
test_to_partial_path() Link
Passes if the object’s model responds to to_partial_path
and if calling this method returns a string. Fails otherwise.
to_partial_path
is used for looking up partials. For example, a BlogPost model might return “blog_posts/blog_post”.