One model interface to read/write to multiple models Django

I've the following models in Django.

class User(models.Model):

       name = models.CharField(max_length=50)

       ...

       ...

    class UserInformation(models.Model):

       user = models.ForeignKey(User)

       key = models.CharField(max_length=250)

       value = models.TextField()

       ...

       ...

    class UserAddress(models.Model):

       user = models.ForeignKey(User)

       address = models.TextField(null=True)

       city = models.CharField(max_length=200)

       ...

       ...

Basically I want to create an interface for User through which I can route read and write operations to UserInformation and UserAddress.

user = User.objects.get(id=1)

    Ex - If someone wants to get all addresses of a user.

   user.get_information('address') --> This will in turn search UserAddress table and return a list of addresses.

    Ex - If someone wants to get the current age of a user.

   user.get_information('age') --> This will in turn search UserInformation table with key=age and return the value.

Similarly given a key I want to write data through the interface.

    Ex - Insert age of a user.Enter code here...

    user = User.objects.get(id=1)

   user.update_information('age', value=30) --> This will in turn insert a row in UserInformation table with key=age and value=30.

Problems:

=========

* I'm planning to create another table TableKeyMapping to keep the mapping of keys to table names. Such as if key_name=age, table_name=UserInformation. If key_name=address, then table_name=UserAddress.

What should I save in table_name..the model name UserAddress or the complete path including the the app user.models.UserAddress.

* To get data, I was planning to create a property called get_information in User model which will take key_name as a parameter. Is this the proper approach or are there any better solutions available.

* Not sure how I'll write data into separate tables. Any links or documentation will be appreciated.

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