Question

I’m trying to set the namespace for all DB operations for the Google App Engine in python, but i can’t get it done.

Currently my code looks something like this:

""" Set Google namespace """
if user:
    namespace = thisUser.namespace
    namespace_manager.set_namespace(namespace)
""" End Google namespace """

#Then i have all sorts of classes:

class MainPage(BaseHandler):
    def get(self):
        #code with DB operations like get and put...

class MainPage2(BaseHandler):
    def get(self):
        #code with DB operations like get and put...

class MainPage3(BaseHandler):
    def get(self):
        #code with DB operations like get and put...

app = webapp2.WSGIApplication([ ... ], debug=True, config=webapp2_config)

The problem with this is, is that in the classes all DB operations are still done on the default namespace (so as if no namespace is set). Eventhough i set the namespace in the very top of my code.

When i print the variable “namespace”, which i also set in the top of the code, then i do get to see the namespace that i wish to use.

But it looks like Google App Engine somewhere resets the namespace to empty before running the code in the classes.

So now i’m wondering if there’s a good way to set the namespace once somewhere.

Currently i set it like this in all “def’s”:

class MainPage(BaseHandler):
    def get(self):
        namespace_manager.set_namespace(namespace)

        #code with DB operations like get and put...

class MainPage(BaseHandler):
    def get(self):
        namespace_manager.set_namespace(namespace)

        #code with DB operations like get and put...

etc...

It’s just not a very elegant solution.

Answer 1

You need to write a middleware that will intercept the request and will set the namespace according to your app logic.