A User has many teachers. I'm trying to lock down my API. I have a 
"user.add_teacher teacher" method and want to make that the *only* way to 
"user.teachers << teacher". Any way to lock down the teachers association so it 
is read only from outside the user class and only settable within self?

I'm not just looking for attr_protected to avoid mass assignment. I'm 
specifically looking to ensure that nobody on the team will write 
"user.teachers << teacher" and bypass all of the additional business logic in 
the add_teacher method. I know I can do a "find within project" for "teachers 
<<" but don't want to remember to have to do that.

I know my specs should catch anything that's amiss, and I'm not sure whether 
this is an idiomatic approach in Ruby/Rails but I'd appreciate any 
thoughts/suggestions.

Thanks,
Peter


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