Get the value of has_many in rails error(no method error)-Collection of common programming errors

The problem is that at least one of the comments on your post object has a nil value for the user association. You’re checking that email is not nil, but you’re not checking whether user itself is nil (which is what is triggering the NoMethodError).

As a start, I would change this line:

to:

This is a handy pattern in ruby which first checks that comment.user is defined, and if it is defined returns the second argument, i.e. comment.user.email. If comment.user is not defined (or nil, or false) then the second argument is not evaluated, and the return value is nil (so if no user is defined, then comment.user.email is never evaluated so you don’t get an error).

Originally posted 2013-11-09 21:20:56.