method

find_by!

rails latest stable - Class: ActiveRecord::FinderMethods

find_by!(arg, *args)

public

Like #find_by, except that if no record is found, raises an ActiveRecord::RecordNotFound error.

# File activerecord/lib/active_record/relation/finder_methods.rb, line 109
    def find_by!(arg, *args)
      where(arg, *args).take!
    end