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I have a parent object, Post, which has the following children.
has_one :link
has_one :picture
has_one :code
These children are mutually exclusive.
Is there a way to use polymorphic associations in reverse so that I don't have to have link_id, picture_id, and code_id fields in my Post table?
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Polymorphic relationship in Rails refers to a type of Active Record association. This concept is used to attach a model to another model that can be of a different type by only having to define one association.
Polymorphic association is a term used in discussions of Object-Relational Mapping with respect to the problem of representing in the relational database domain, a relationship from one class to multiple classes.
In Ruby on Rails, a polymorphic association is an Active Record association that can connect a model to multiple other models. For example, we can use a single association to connect the Review model with the Event and Restaurant models, allowing us to connect a review with either an event or a restaurant.
I wrote up a small Gist showing how to do this: https://gist.github.com/1242485
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