I am a beginner in Ruby on Rails.

I would like to make the following database model:

Package (has_many packagelines)
  Packageline (belongs_to package)

The package line can be one of 3 things: entity, item or service, so I
would like to have a line type with the options entity, item or service.
I also want a field where I store the foreign key. The problem is that
the foreign key is dependent on what is selected in the line type field.

Can somebody tell me how I can manage this.

Thanx!

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