Conditional 'attr_accessible' using ActiveResource in Ruby on Rails?

You could try something like what Amazon Web Services does: use a very long, randomly generated key with each request. Check that key is correct in your profiles app, and if yes, update the attribute.

Solution: Don't use simply Profile. Create, use the association builders instead. Protect the user_id attribute and use user.profiles.

Create!(params:profile) to have it automatically set the user_id field for profiles to whatever the user object is.

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