Quoting Learn By Doing <[email protected]>:
> 
> Hi Colin,
> 
> After reading the API, I think that
> 
>      validates_presence_of   :user_id
> 
> will not even check to make sure that the user exists in the user
> table.  It only makes sure that the field value is not blank:
> http://apidock.com/rails/ActiveRecord/Validations/ClassMethods/validates_presence_of.
> 
> So this validation does not do the work of a proper foreign key
> constraint.  Am I reading the API incorrectly?
> 

Yes, there is another validation to verify that the associated object exists
and is valid, validates_associated.

HTH,
  Jeffrey

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