author | Sverre Rabbelier <srabbelier@gmail.com> |
Sat, 12 Sep 2009 17:10:39 +0200 | |
changeset 2907 | fbf0d63f37b9 |
parent 54 | 03e267d67478 |
permissions | -rw-r--r-- |
54
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1 |
from django.db import models |
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from django.utils.translation import ugettext_lazy as _ |
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from django.utils.encoding import smart_unicode |
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|
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class ContentTypeManager(models.Manager): |
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|
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# Cache to avoid re-looking up ContentType objects all over the place. |
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# This cache is shared by all the get_for_* methods. |
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_cache = {} |
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|
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def get_for_model(self, model): |
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""" |
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Returns the ContentType object for a given model, creating the |
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ContentType if necessary. Lookups are cached so that subsequent lookups |
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for the same model don't hit the database. |
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""" |
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opts = model._meta |
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key = (opts.app_label, opts.object_name.lower()) |
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try: |
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ct = self.__class__._cache[key] |
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except KeyError: |
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# Load or create the ContentType entry. The smart_unicode() is |
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# needed around opts.verbose_name_raw because name_raw might be a |
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# django.utils.functional.__proxy__ object. |
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ct, created = self.get_or_create( |
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app_label = opts.app_label, |
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model = opts.object_name.lower(), |
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28 |
defaults = {'name': smart_unicode(opts.verbose_name_raw)}, |
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) |
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self._add_to_cache(ct) |
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|
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return ct |
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|
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def get_for_id(self, id): |
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""" |
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Lookup a ContentType by ID. Uses the same shared cache as get_for_model |
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(though ContentTypes are obviously not created on-the-fly by get_by_id). |
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""" |
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try: |
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ct = self.__class__._cache[id] |
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except KeyError: |
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# This could raise a DoesNotExist; that's correct behavior and will |
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# make sure that only correct ctypes get stored in the cache dict. |
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ct = self.get(pk=id) |
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self._add_to_cache(ct) |
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return ct |
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|
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def clear_cache(self): |
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""" |
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Clear out the content-type cache. This needs to happen during database |
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flushes to prevent caching of "stale" content type IDs (see |
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52 |
django.contrib.contenttypes.management.update_contenttypes for where |
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this gets called). |
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""" |
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self.__class__._cache.clear() |
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|
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def _add_to_cache(self, ct): |
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"""Insert a ContentType into the cache.""" |
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model = ct.model_class() |
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key = (model._meta.app_label, model._meta.object_name.lower()) |
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self.__class__._cache[key] = ct |
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self.__class__._cache[ct.id] = ct |
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|
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class ContentType(models.Model): |
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name = models.CharField(max_length=100) |
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app_label = models.CharField(max_length=100) |
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model = models.CharField(_('python model class name'), max_length=100) |
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objects = ContentTypeManager() |
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|
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class Meta: |
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verbose_name = _('content type') |
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verbose_name_plural = _('content types') |
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db_table = 'django_content_type' |
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ordering = ('name',) |
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unique_together = (('app_label', 'model'),) |
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|
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def __unicode__(self): |
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return self.name |
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|
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def model_class(self): |
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81 |
"Returns the Python model class for this type of content." |
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82 |
from django.db import models |
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83 |
return models.get_model(self.app_label, self.model) |
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84 |
|
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85 |
def get_object_for_this_type(self, **kwargs): |
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86 |
""" |
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Returns an object of this type for the keyword arguments given. |
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88 |
Basically, this is a proxy around this object_type's get_object() model |
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89 |
method. The ObjectNotExist exception, if thrown, will not be caught, |
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90 |
so code that calls this method should catch it. |
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91 |
""" |
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return self.model_class()._default_manager.get(**kwargs) |