[ACCEPTED]-Rails 4: How to cancel save on a "before_save" callback?-ruby-on-rails
Rails 5
As of Rails 5, you can signal that an operation should 19 be aborted by explicitly calling throw :abort inside 18 your callback. The documentation section 17 on cancelling callbacks (now) states:
If a
before_*callbackthrows :abort, all the 16 later callbacks and the associated action 15 are cancelled.
The following section on transactions continues:
If 14 a
before_*callback cancels the action aROLLBACKis issued. You 13 can also trigger aROLLBACKraising an exception 12 in any of the callbacks, includingafter_*hooks.
Rails 4
The 11 story is pretty similar to with Rails 5, except 10 that callbacks should instead return false. The 9 corresponding parts of the documentation helpfully states
If 8 a
before_*callback returns false, all the later 7 callbacks and the associated action are 6 cancelled. If an after_* callback returns 5 false, all the later callbacks are cancelled.
Followed 4 by
If a before_* callback cancels the action 3 a
ROLLBACKis issued. You can also trigger a ROLLBACK 2 raising an exception in any of the callbacks, including 1 after_* hooks.
To prevent record from being saved, you 1 should simply return false:
def check_for_similar_record
if ProductsColor.exists?(color_id: self.color_id, product_id: self.product_id)
# merge values
false
else
true
end
end
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