Router to integrate django with postgres database schemas

routers.py

class AbstractRouter(object):
    """
    A router to control all database operations on models in the
    application.
    """
    def __init__(self, app, schema):
        self.app = app
        self.schema = schema

    def db_for_read(self, model, **hints):
        """
        Attempts to read 'app' models go to 'schema' database.
        """
        if model._meta.app_label == self.app:
            return self.schema
        return None

    def db_for_write(self, model, **hints):
        """
        Attempts to write 'app' models go to 'schema' database.
        """
        if model._meta.app_label == self.app:
            return self.schema
        return None

    def allow_relation(self, obj1, obj2, **hints):
        """
        Allow relations if a model in the 'app' is involved.
        """
        if obj1._meta.app_label == self.app or \
           obj2._meta.app_label == self.app:
           return True
        return None

    def allow_migrate(self, db, app_label, model=None, **hints):
        """
        Make sure the 'app' only appears in the 'schema'
        database.
        """
        if app_label == self.app:
            return db == self.schema
        return None

class FooRouter(AbstractRouter):
    def __init__(self):
        AbstractRouter.__init__(self, 'app', 'schema')