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In Ruby on Rails Guide, is imageable a model? And does imageable have a database table?
How does imageable_id point to two different id attributes for Employee and Product?
No, in the page that you linked, imageable represents a polymorphic association to either an Employee or Product. In order for the polymorphic association to work, rails will need to determine the ‘type’ of object (i.e. either an Employee or a Product) by looking at the ‘imageable_type’ entry in the db and then the id of the respective object (imageable_id).
For example, an entry within the db of imageable_type => ‘Employee’ and and imageable_id => ‘4’. ActiveRecord would figure out that the association is to id 4 in the employees table.