Ruby Object#id warnings and Active Record

Question

We keep seeing warnings like the following when we run our specs:

Object#id will be deprecated; use Object#object_id

The code in question is accessing the id of an ActiveRecord model (which is an attribute on the table, obviously, rather than the object instance ID in the Ruby VM).

Does anyone know how to turn these particular warnings off or somehow avoid them?

Answer 1

When an object is descended from ActiveRecord::Base, a call to id goes to AR::B's id method rather than the deprecated one on Object.

That warning usually means one of my objects isn't what I think it is.

Answer 2

The object#id warning only happen on regular ruby classes like NilClass. ActiveRecord::Base overrides object#id

Answer 3

Your object is not actually an AR object, usually indicating that some data retrieval has failed (Table.find_by_name('nonexistent name') will return nil). If all you want to do is shut off the visible warnings, you can turn off whiny_nils in your config, otherwise do an is_a? test before trying to access the object's attributes and handle the failure case gracefully.

Answer 4

Try using [:id] instead of .id

Answer 5

I'm assuming you're doing mocking / stubbing (because you mentioned specs).

In my case, I run into these warnings when I stub an ActiveRecord object and access its ID attribute.

In cases where you expect to access the ID of your ActiveRecord object, I'd recommend you do the following:

 mock("MyActiveRecordObject", :id => 1001)