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Hello!

As a noob in rails, i am having a problem on how to find a decent and 
straightforward notifications system for my application. 
Being a Api like application (talking with the client is made using JSON / 
later on XML as well), i have a problem finding a good solution to feed my 
needs. 

I have tried to use the rails validators, but then i have realized that is not 
a good solution, as i need to send normal notifications as well (Ex: "You have 
successfully bought this item" ).

After that ideea failed ... I have tried to implement a "Notification" module 
inside my user model as, all my notifications are user related. However ... 
this system has 2 instance variables :    @notifications and @api_errors.  Now, 
the problem would be the validation of the user action, and here might be 
several messages to send:

 - Stock finished 
 - No money 
 - No access to this feature ... 
 - CC invalid 
... etc

now ... i can do my checks like 

if false == money_requirement? 
 self.add_api_error "You do not have enough money"
end

if false == product.stock_requirement?
  self.add_api_error .... 
end

But the main problem ... would be now, the method of trigger the action.  

if self.api_errors.size == 0 
  # do play with the user account, stocks and other stuff .... 
end 

what i am asking you: Is there any way to play with those notifications and 
errors without passing through the database?   They are more like flashes, but 
the code is inside the model ... so, i don't want to fall into an antipattern 
having session related info inside my model. 

Thanks.
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