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Maximillian Dornseif
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Dec 10, 2014
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| #!/usr/bin/env python | ||
| # encoding: utf-8 | ||
| """ | ||
| gaetk/comp.py compability layer for App Engine | ||
| Created by Dr. Maximillian Dornseif on 2014-12-10. | ||
| Copyright (c) 2014 HUDORA GmbH. All rights reserved. | ||
| """ | ||
|
|
||
| from urllib import unquote | ||
|
|
||
| from google.appengine.ext import db | ||
| from google.appengine.ext import ndb | ||
|
|
||
| def xdb_kind(model_class): | ||
| """Get kind from db or ndb model class""" | ||
| kind = getattr(model_class, '_get_kind', None) | ||
| if not kind: | ||
| kind = getattr(model_class, 'kind', None) | ||
| if not kind: | ||
| return model_class.__name__ | ||
| return kind() | ||
|
|
||
| def xdb_get(model_class, encoded_key): | ||
| """Ermittle die Instanz über den gegeben ID""" | ||
| if issubclass(model_class, ndb.Model): | ||
| key = ndb.Key(urlsafe=encoded_key) | ||
| instance = key.get() | ||
| elif issubclass(model_class, db.Model): | ||
| instance = model_class.get(unquote(encoded_key)) | ||
| return instance | ||
|
|
||
| def xdb_is_ndb(model_class): | ||
| if hasattr(model_class, 'all'): | ||
| return False | ||
| else: | ||
| return True | ||
|
|
||
| def xdb_key(instance): | ||
| if xdb_is_ndb(instance): | ||
| return instance.key | ||
| else: | ||
| return instance.key() | ||
|
|
||
| def xdb_to_protobuf(instance): | ||
| if xdb_is_ndb(instance): | ||
| return ndb.ModelAdapter().entity_to_pb(instance).Encode() | ||
| else: | ||
| db.model_to_protobuf(instance).Encode() | ||
|
|
||
| def _get_queryset_db(model_class, ordering=None): | ||
| """Queryset für Subklasse von db.Model""" | ||
| query = model_class.all() | ||
| if ordering: | ||
| attr, direction = ordering | ||
| if attr in model_class.properties(): | ||
| if direction == '-': | ||
| attr = '-' + attr | ||
| query.order(attr) | ||
| return query | ||
|
|
||
| def _get_queryset_ndb(model_class, ordering): | ||
| """Queryset für Subklasse von ndb.Model""" | ||
| query = model_class.query() | ||
| if ordering: | ||
| attr, direction = ordering | ||
| prop = model_class._properties.get(attr) | ||
| if prop: | ||
| if direction == '-': | ||
| return query.order(-prop) | ||
| else: | ||
| return query.order(prop) | ||
| return query | ||
|
|
||
| def xdb_queryset(model_class, ordering=None): | ||
| """Gib das QuerySet für die Admin-Seite zurück | ||
| Es wird die gewünschte Sortierung durchgeführt. | ||
| """ | ||
| # TODO: Tupel: (attr, direction) | ||
| if xdb_is_ndb(model_class): | ||
| query = _get_queryset_ndb(model_class, ordering) | ||
| else: | ||
| query = _get_queryset_db(model_class, ordering) | ||
| return query | ||
|
|
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