Ruby on Rails Callback, what is difference between :before_save and :before_create?

Question

Could you explain in detail what the :before_save and :before_create Ruby on Rails callbacks are, and what they have to do with Rails validations?

Answer 1

before_create vs before_save :on => :create

Sometimes you have to be careful of the order of the callbacks

See here for more details: http://pivotallabs.com/activerecord-callbacks-autosave-before-this-and-that-etc/