Django models relation about user user_group asset asset group

[周建华]

I have design the base model like this:

class User
    some user attr

class UserGroup 
    some user_group attr

class Asset
   ...

class AssetGroup
   ...


I want to authorize asset and asset_group to user or user_group, I have no 
good idea about the models design

If i set like this:

class UserAsset
    user = ..
    asset = ...

class UserAssetGroup
   user = ..
   asset_group = ...

class UserGroupAsset
   user_group = 
   asset = 

class UserGroupAssetGroup
    user_group = 
    asset_group = ..


If I check the user  have the asset permission or not , i will check the 
user or user group of the user isn't have the asset permission,  the user 
or user group have the asset group(the asset belong to)  permission   . 
It's will check more than 10 tables.





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