Two ForeignKeys to show a combo in admin

Hi! I have a model as this:

class User:

   id

class Type:

   user = ForeignKey(User)

class B:

   user = ForeignKey(User)

   type = ForeignKey(Type)

  

When I'm creating a B object in the admin I like to show a combo with all the users, and after select the user in the first combo, fill the second combo only with Type of their users...

I must do that with ajax and subquerys? or admin.py allow me to do this easily?

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@agonzalezro

Please, don't send me files with extensions: .doc, .docx, .xls, .xlsx, .ppt and/or .pptx

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