Question

I’ve created two objects outside the database. One is SERVICES and one is MODULES.

I’d like to be able to get all MODULES related to a certain service. For instance, for the below example, I’d like to issue a command that basically says “Get list of Module Objects related to Service with key FACEBOOK” and have it return the two last Module objects.

class Module(object):

    def __init__(self, key, service, name):
        self.key = key
        self.service = service
        self.name = name

ALL_MODULES = [
    Module(
        'TWT',
        SERVICES['TWITTER'],
        'Twitter Tweets',
    ),
    Module(
        'FBC',
        SERVICES['FACEBOOK'],
        'Facebook Comments',
    ),
    Module(
        'FBP',
        SERVICES['FACEBOOK'],
        'Facebook Posts',
    ),
]

#dict of the above list
MODULES = dict([(s.key, s) for s in ALL_MODULES])

Answer 1

I assume that SERVICES returns a Service-class having an name-attribute. If this is true, then you can get all modules related to a service (FACEBOOK for example) like this:

serviceModules = [m for m in ALL_MODULES if m.service.name == 'FACEBOOK']