Comments on: A Detailed Django Tutorial: Blog Basics Part II

By: Peter Hanley

Peter Hanley — Mon, 02 Aug 2010 14:11:51 +0000

My previous comment had an error – changing the code to “obj.author = request.author” will generate another error.

However, changing the placement of the save_model code block to right underneath the class definition fixes the problem (not sure why, but I’m assuming it’s to do with when the different lines actually execute):
from django.contrib import admin from models import Post class PostAdmin(admin.ModelAdmin): def save_model(self, request, obj, form, change): if not change: obj.author = request.user obj.save() fields = ( 'title' , 'body') list_display = ('title', 'author', 'pub_date') date_hierarchy = 'pub_date' admin.site.register(Post, PostAdmin)
Note that if you copy/paste this block, you may have to clean up your indentation.

By: Peter Hanley

Peter Hanley — Mon, 02 Aug 2010 14:01:01 +0000

Unfortunately, adding author to the fields – while it does make the page work – also undoes what he was showing users how to do (adding the current logged in user as a hidden, unchangeable value rather than a selectable list)

I looked up the related documentation and found

class ArticleAdmin(admin.ModelAdmin):
def save_model(self, request, obj, form, change):
obj.user = request.user
obj.save()

at http://docs.djangoproject.com/en/1.2/ref/contrib/admin/#django.contrib.admin.ModelAdmin.save_model

I had hoped that obj.author = request.user was a typo and tried changing the line to
obj.author = request.author
on the grounds that there wasn’t a user defined explicitly in the app, but it also didn’t work.

I’m still looking around, though.

By: Joey

Joey — Fri, 18 Jun 2010 07:42:26 +0000

admin.py

–
from django.contrib import admin
from models import Post

class PostAdmin(admin.ModelAdmin):
fields = (‘author’, ‘title’, ‘body’)
list_display = (‘title’, ‘author’, ‘pub_date’)
date_hierarchy = ‘pub_date’
def save_model(self, request, obj, form, change):
if not change:
obj.author = request.user
obj.save()
admin.site.register(Post, PostAdmin)

–

You have to add author to fields.

By: Error in Section 1

Error in Section 1 — Sun, 21 Mar 2010 22:58:42 +0000

In section 1 there was a typing error for creating the posts app: you said to put “python manage.py startproject posts”, when it should have been “python manage.py startapp posts”. Luckily, I caught the error before I tried to run your code.

By: lizzie

lizzie — Thu, 08 Oct 2009 17:31:57 +0000

I have the same error as Jack, here’s the traceback:
Traceback:
File “/var/lib/python-support/python2.6/django/core/handlers/base.py” in get_response
86. response = callback(request, *callback_args, **callback_kwargs)
File “/var/lib/python-support/python2.6/django/contrib/admin/sites.py” in root
157. return self.model_page(request, *url.split(‘/’, 2))
File “/var/lib/python-support/python2.6/django/views/decorators/cache.py” in _wrapped_view_func
44. response = view_func(request, *args, **kwargs)
File “/var/lib/python-support/python2.6/django/contrib/admin/sites.py” in model_page
176. return admin_obj(request, rest_of_url)
File “/var/lib/python-support/python2.6/django/contrib/admin/options.py” in __call__
191. return self.add_view(request)
File “/var/lib/python-support/python2.6/django/db/transaction.py” in _commit_on_success
238. res = func(*args, **kw)
File “/var/lib/python-support/python2.6/django/contrib/admin/options.py” in add_view
494. self.save_model(request, new_object, form, change=False)
File “/var/lib/python-support/python2.6/django/contrib/admin/options.py” in save_model
376. obj.save()
File “/var/lib/python-support/python2.6/django/db/models/base.py” in save
311. self.save_base(force_insert=force_insert, force_update=force_update)
File “/var/lib/python-support/python2.6/django/db/models/base.py” in save_base
383. result = manager._insert(values, return_id=update_pk)
File “/var/lib/python-support/python2.6/django/db/models/manager.py” in _insert
138. return insert_query(self.model, values, **kwargs)
File “/var/lib/python-support/python2.6/django/db/models/query.py” in insert_query
894. return query.execute_sql(return_id)
File “/var/lib/python-support/python2.6/django/db/models/sql/subqueries.py” in execute_sql
309. cursor = super(InsertQuery, self).execute_sql(None)
File “/var/lib/python-support/python2.6/django/db/models/sql/query.py” in execute_sql
1734. cursor.execute(sql, params)
File “/var/lib/python-support/python2.6/django/db/backends/util.py” in execute
19. return self.cursor.execute(sql, params)
File “/var/lib/python-support/python2.6/django/db/backends/sqlite3/base.py” in execute
168. return Database.Cursor.execute(self, query, params)

Exception Type: IntegrityError at /admin/posts/post/add/
Exception Value: posts_post.author_id may not be NULL

Any suggestions?

By: Jack

Jack — Sat, 05 Sep 2009 11:50:11 +0000

I get the following error when I try to save a post:

IntegrityError at /admin/posts/post/add/

posts_post.author_id may not be NULL

Any idea what could be causing that?

By: Jeff

Jeff — Sun, 14 Jun 2009 22:24:27 +0000

If I recall correctly, this was changed in some svn revision.

Just wondering, are you using SVN or 1.0?

By: Spy

Spy — Fri, 24 Apr 2009 14:29:36 +0000

Hi,

I have had a problem with urlpatterns, in my opinion instead of
(r’^admin/’, include(admin.site.urls)),
should be
(r’^admin/(.*)’, admin.site.root),
Regards,
Spy

By: Django Blog Tutorial | Blog of Jeff

Django Blog Tutorial | Blog of Jeff — Fri, 03 Apr 2009 07:49:28 +0000

[...] Part 2 [...]