author | Nishanth Amuluru <nishanth@fossee.in> |
Sat, 08 Jan 2011 11:20:57 +0530 | |
changeset 307 | c6bca38c1cbf |
permissions | -rw-r--r-- |
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""" |
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By specifying the 'proxy' Meta attribute, model subclasses can specify that |
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they will take data directly from the table of their base class table rather |
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than using a new table of their own. This allows them to act as simple proxies, |
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providing a modified interface to the data from the base class. |
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""" |
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from django.contrib.contenttypes.models import ContentType |
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from django.db import models |
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# A couple of managers for testing managing overriding in proxy model cases. |
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|
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class PersonManager(models.Manager): |
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def get_query_set(self): |
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return super(PersonManager, self).get_query_set().exclude(name="fred") |
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class SubManager(models.Manager): |
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def get_query_set(self): |
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return super(SubManager, self).get_query_set().exclude(name="wilma") |
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class Person(models.Model): |
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""" |
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A simple concrete base class. |
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""" |
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name = models.CharField(max_length=50) |
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objects = PersonManager() |
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def __unicode__(self): |
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return self.name |
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class Abstract(models.Model): |
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""" |
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A simple abstract base class, to be used for error checking. |
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""" |
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data = models.CharField(max_length=10) |
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class Meta: |
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abstract = True |
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class MyPerson(Person): |
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""" |
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A proxy subclass, this should not get a new table. Overrides the default |
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manager. |
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""" |
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class Meta: |
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proxy = True |
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ordering = ["name"] |
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objects = SubManager() |
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other = PersonManager() |
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def has_special_name(self): |
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return self.name.lower() == "special" |
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class ManagerMixin(models.Model): |
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excluder = SubManager() |
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class Meta: |
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abstract = True |
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class OtherPerson(Person, ManagerMixin): |
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""" |
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A class with the default manager from Person, plus an secondary manager. |
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""" |
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class Meta: |
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proxy = True |
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ordering = ["name"] |
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class StatusPerson(MyPerson): |
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""" |
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A non-proxy subclass of a proxy, it should get a new table. |
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""" |
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status = models.CharField(max_length=80) |
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# We can even have proxies of proxies (and subclass of those). |
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class MyPersonProxy(MyPerson): |
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class Meta: |
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proxy = True |
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class LowerStatusPerson(MyPersonProxy): |
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status = models.CharField(max_length=80) |
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class User(models.Model): |
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name = models.CharField(max_length=100) |
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def __unicode__(self): |
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return self.name |
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class UserProxy(User): |
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class Meta: |
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proxy = True |
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class UserProxyProxy(UserProxy): |
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class Meta: |
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proxy = True |
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# We can still use `select_related()` to include related models in our querysets. |
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class Country(models.Model): |
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name = models.CharField(max_length=50) |
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class State(models.Model): |
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name = models.CharField(max_length=50) |
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country = models.ForeignKey(Country) |
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def __unicode__(self): |
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return self.name |
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class StateProxy(State): |
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class Meta: |
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proxy = True |
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# Proxy models still works with filters (on related fields) |
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# and select_related, even when mixed with model inheritance |
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class BaseUser(models.Model): |
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name = models.CharField(max_length=255) |
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class TrackerUser(BaseUser): |
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status = models.CharField(max_length=50) |
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class ProxyTrackerUser(TrackerUser): |
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class Meta: |
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proxy = True |
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class Issue(models.Model): |
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summary = models.CharField(max_length=255) |
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assignee = models.ForeignKey(TrackerUser) |
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def __unicode__(self): |
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return ':'.join((self.__class__.__name__,self.summary,)) |
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class Bug(Issue): |
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version = models.CharField(max_length=50) |
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reporter = models.ForeignKey(BaseUser) |
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class ProxyBug(Bug): |
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""" |
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Proxy of an inherited class |
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""" |
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class Meta: |
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proxy = True |
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|
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class ProxyProxyBug(ProxyBug): |
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""" |
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A proxy of proxy model with related field |
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""" |
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class Meta: |
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proxy = True |
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|
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class Improvement(Issue): |
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""" |
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A model that has relation to a proxy model |
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or to a proxy of proxy model |
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""" |
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version = models.CharField(max_length=50) |
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reporter = models.ForeignKey(ProxyTrackerUser) |
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associated_bug = models.ForeignKey(ProxyProxyBug) |
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|
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class ProxyImprovement(Improvement): |
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class Meta: |
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proxy = True |