MODELFORM DESIGN

[Heman Okumbo]

I need to implement a model design where users_a upload data:(Description_Fields-name,email,area,region,comments and some images) according to their Location_Fields(country, city/state and district).when user_b search for content they access this data according to the criterion it was uploaded(Location_Fields)then (Description_Field).Users_a can also view contents sent by other users_a,user_b cannot perform operations done by users_a:upload data,I have the code/api that produce (Location_Fileds):How do i chain Description_fields to Location_Fields,especially the district?