[Rails] Re: has_one :item, :polymorphic => true

Yup, then like Marnen said, Person should belong to Item:

belongs_to :item, :polymorphic => true

In your migration, you can use:

t.references :item, :polymorphic => true

Which will create item_type and item_id columns.

Then each class A, B, and C can have one person:

has_one :person, :as => :item

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