I often see a use case when in a query, there are several relations with 
attributes with the same names(for example, in our codebase, there are 
several "soft-deletable" entities, and all of them have deleted_at

Article.where(deleted_at: nil).joins(:comments).where(comments: { deleted_at: 
nil })

At the moment, it's not possible to unscope deleted_at only for articles or 
only for comments.

I created a PR that adds support for specifying tables in where clauses in 
unscope method:

Article.where(deleted_at: nil).joins(:comments).where(comments: { deleted_at: 
nil }).unscope(where: { articles: :deleted_at })
  # == Article.joins(:comments).where(comments: { deleted_at: nil }) 

PR: https://github.com/rails/rails/pull/38608

Happy to get any feedback, thanks!

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