Recently we had a few PRs created that defined the same association. They were both in code review at the same time, so both added the association that did not previously exist. When both got merged, we didn't realize that we now had the same association defined twice in 1 model. It would be nice if there were a cop that caught this and pointed it out.

For example:

belongs_to :foo
belongs_to :bar
belongs_to :blah
belongs_to :foo # <----- Duplicate

has_many :somethings