Permission on insert rules

Hello everybody,

Just a question.
I'm writing some rules to insert/update some data in my database, and I 
gave all the privileges on that view to the user, and only select on the 
tables.
When that user inserts data using the view, I thought that was user 
postgres that will do the rest ! But I got  permission denied on those 
tables.
The idea was to create a layer, with the views, giving to that user 
permission on views to insert and update, and not to tables.
Is this possible ?

Thanks in advance.
Luis Sousa