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Add change tracking methods for `belongs_to` associations by georgeclaghorn · Pu...
source link: https://github.com/rails/rails/pull/42751
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Permit checking whether a belongs_to association has been pointed to a new target record in the previous save and whether it will point to a new target record in the next save.
post.category # => #<Category id: 1, name: "Ruby"> post.category = Category.second # => #<Category id: 2, name: "Programming"> post.category_changed? # => true post.category_previously_changed? # => false post.save! post.category_changed? # => false post.category_previously_changed? # => true
Example use case: use Hotwire to broadcast removal of a blog post from its previous category when its category changes. Requires an accessor for the previous target of the association, which can be added separately.
To-do:
- Documentation
- Tests
- Changelog entry
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