ruby on rails - How to create permalink with id? -

How do I create a permacetime with an ID for a new model?

Example

  Animal = Animal. Creating (name: 'cool dog') surgery does animal with the name of the # 1 and the dog's animal name. Urinal = & gt; "1-Cold-dog"   
 How do you add the proper callback so that the ID is inserted?  before_save  or  after_save  does not work  
  after_save: update_permalink #or before_save def update_permalink self.permalink = "# {id} # {name} } ". Paramerize and   
 What's happening? Instead of "1-cold dog" I get "Cool-dog"  
 And why do I find it on after_save Setting up an attribute without saving but does not work on first_save because the ID is not built on a new record.   
 
 
 According to  
 you should use after_save  
 
 Save and destroy both, wrapped in a transaction, it ensures that you will be under the cover of what you do in the verification or callback. You can use assumptions to check the values ​​that depend on the transaction or you can increase the exception of rollback in the callback, which includes the after_ * callback.  
 As a result of the database changes are not seen outside your connection until the operation is complete. For example, if you later attempt to update the indicator of a search engine, then not after viewing the updated record for the index. There is a one-time callback update that is updated once. see below.   
 As I have mentioned above, you may like it compared to your animal model.  
  def to_param "# {id}} - # {name.parameterize}" end   
 This will automatically all your URLs like that permelink Which you are trying to create and you still have  Animal.find (params [: id])