Here is the logic that I am trying to achieve. I have a User Model and
the business rule is that user can accept maximum 5 friends requests.
for this I have an accept method in User Model which looks similar to
below code snippet
raise ArgumentError if self.friends.count >= MAX_FRIENDS_ALLOWED
#code to add friend to friends list
As you can see that I basically query for count of friends for a user
and if the count is greater then or equal to MAX_FRIENDS_ALLOWED the
friend accept request should not go through.
From the UI perspective I have a link_to_remote, "Accept" link that
calls an action which calls the User Model's "accept" method. Basically
UI looks like
FRIEND NAME | Action