Cop to check for duplicate scopes

[dvandersluis]

I accidentally wrote the following code:

scope :visible, -> { where(visible: true) }
scope :hidden, -> { where(visible: true) }

It'd be great to detect that the same scope is defined twice, because this most likely is always an error.

Describe the solution you'd like

Register an offense when multiple scopes have identical bodies.

Describe alternatives you've considered

N/A

Additional context

N/A

[natematykiewicz]

I made a PR for this #607

[lulalala]

Hi @natematykiewicz I want to ask you if you think the following use case can be included as part of the DuplicateScope cop:

We accidentally declared the scope with the same name twice, but with different scoping. This has caused some confusion as to why the scope behaves differently.

The case is different to what you are covering. I want to write a cop for such case, but am wondering if making it part of your cop makes sense. Thanks!