In a model for a site I'm building I need that two entities have
different values when taken together. So I used the unique_together
into the Meta class. My code looks like this:
class Language(models.Model):
#...
class Url(models.Model):
# ...
class Content(models.Model):
url = models.ForeignKey(Url)
language = models.ForeignKey(Language)
# ...
class Meta:
unique_together = (("url", "language"), )
(content doesn't specify a primary key so django creates the
content_id entity)
In this way I should be able to associate to the same URL multiple
contents in different languages and in the same time to be sure that
for a URL there is at most one content per language (of course the
language management is handled by the view).
Everything works well, but trying to modify one content just gives
this:
AssertionError at /admin/pageviewer/content/2/
get() returned more than one Content -- it returned 2! Lookup
parameters were {'published_on__year': 2007, 'published_on__month':
12, 'title__iexact': 'Homepage', 'published_on__day': 15}
This is due to the fact that django does a lookup query without the
two attributes that I declared as unique_together, and it returns more
than one entry (as it should be).
Additionally, a sqlall on the application shows this on the content
table:
CREATE TABLE "pageviewer_content" (
"id" integer NOT NULL PRIMARY KEY,
"url_id" varchar(70) NOT NULL REFERENCES "pageviewer_url" ("url"),
"language_id" varchar(2) NOT NULL,
"title" varchar(100) NOT NULL,
"content" text NOT NULL,
"published_on" datetime NOT NULL,
"last_modified" datetime NOT NULL,
"author_id" integer NOT NULL REFERENCES "auth_user" ("id"),
UNIQUE ("url_id", "language_id")
);
Shouldn't language_id reference pageviewer_language?
Anyway the question is: is this an expected behavior? and if so, how
can I handle this situation?
Thank you,
Giuliani Vito Ivan
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