How to use becomes in Rails

Question

I have a Post Class and a Comment Class. I have a post object and want to convert it to a Comment object. I went through Rails api and found becomes(klass).For now there is not association between a Post and Comment. So i tried

@post.becomes(Comment)

but becomes method could not be found for @post object. Am i missing something ?

Answer 1

Put the methods you want both models to use on a module. Then include that module in both models.

Answer 2

Please note that becomes returns a new object but does not modify the existing object. You need to do the assignment yourself

@post = @post.becomes(Comment)

See the documentation ActiveRecord::Persistence#becomes