fc3acf2e8d
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
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| .. | ||
| active_record | ||
| arel | ||
| rails/generators | ||
| active_record.rb | ||
| arel.rb | ||