Fix return type of ActiveRecord::QueryMethods#extract_associated #1823
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Motivation
See https://api.rubyonrails.org/classes/ActiveRecord/QueryMethods.html#method-i-extract_associated - this returns an array and the return type unknown since it depends on the association passed in.
Implementation
Override when iterating over QUERY_METHODS to return the right thing seemed like the right place to hook into since it collects methods from the aforementioned Active Record module.
Tests
Updated tests.