Commits on Sep 13, 2021

1. Reset has_one association when the related belongs_to association… …

   … is set.
   
   When setting a `belongs_to` association the inverse `has_one` association is reset.
   
   Example:
   
   ```ruby
   jimmy = Author.create(name: "Jimmy Tolkien")
   david = Author.create(name: "DHH")
   post = jimmy.create_post(title: "The silly medallion", body: "")
   jimmy.post.update!(author: david)
   assert_nil jimmy.post
   ```
   
   Fixes rails#43096

   

   intrip committed Sep 13, 2021
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