Ruby on Rails - activerecord bang (!) methods in ruby on rails- ruby on rails tutorial - rails guides - rails tutorial - ruby rails
- If we need an ActiveRecord method to raise an exception instead of a false value in case of failure, we can add ! to them.
- This is very important. As some exceptions/failures are hard to catch if we don't use ! on them. I recommended doing this in our development cycle to write all our ActiveRecord code this way to save we time and trouble.
Class User < ActiveRecord::Base
validates :last_name, presence: true
end
User.create!(first_name: "John")
#=> ActiveRecord::RecordInvalid: Validation failed: Last name can't be blankClicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team
The ActiveRecord methods which accept a bang (!) are:
- .create!
- .take!
- .first!
- .last!
- .find_by!
- .find_or_create_by!
- #save!
- #update!
- all AR dynamic finders