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from django.db import models
from django.utils.translation import gettext_lazy as _
class ContentTypeManager(models.Manager):
def get_for_model(self, model):
"""
Returns the ContentType object for the given model, creating the
ContentType if necessary.
"""
opts = model._meta
# The str() is needed around opts.verbose_name because it's a
# django.utils.functional.__proxy__ object.
ct, created = self.model._default_manager.get_or_create(app_label=opts.app_label,
model=opts.object_name.lower(), defaults={'name': str(opts.verbose_name)})
return ct
class ContentType(models.Model):
name = models.CharField(maxlength=100)
app_label = models.CharField(maxlength=100)
model = models.CharField(_('python model class name'), maxlength=100)
objects = ContentTypeManager()
class Meta:
verbose_name = _('content type')
verbose_name_plural = _('content types')
db_table = 'django_content_type'
ordering = ('name',)
unique_together = (('app_label', 'model'),)
def __str__(self):
return self.name
def model_class(self):
"Returns the Python model class for this type of content."
from django.db import models
return models.get_model(self.app_label, self.model)
def get_object_for_this_type(self, **kwargs):
"""
Returns an object of this type for the keyword arguments given.
Basically, this is a proxy around this object_type's get_object() model
method. The ObjectNotExist exception, if thrown, will not be caught,
so code that calls this method should catch it.
"""
return self.model_class()._default_manager.get(**kwargs)
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