Databases
StackOverflow2013
Postsdbo
PODjango: m2m relationship is not getting updated in post_save signal
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PODjango: m2m relationship is not getting updated in post_save signal
    primarykey
    data
    text
    <p>In my problem, the m2m relationship is not getting updated in post_save signal.</p> <p>I have a post_save that checks to make sure that the user is a staff member and if they don't have default permissions, then they are assigned default permissions. If the user is not staff, then it confirms that they don't have default permissions. </p> <pre><code>def user_post_save(sender, instance, **kwargs): """ If the user is staff and they don't have default auth permissions assign them. """ group_ids = [g.id for g in instance.groups.all()] if instance.is_staff and 1 not in group_ids: # give them default auth permissions. instance.groups.add(1) elif not instance.is_staff and 1 in group_ids: # if they are not staff and they have the permission, remove it. instance.groups.remove(1) post_save.connect(user_post_save, sender=User) </code></pre> <p>The problem is that instance.groups makes it to the end of user_post_save with the correct intended values, however it doesn't update in the db. What I am missing? </p> <p>Thank you ahead of time for your help!</p> <hr> <p>More info: I was playing around and took away staff status from a user with default permissions. When I looked at the postgres logs, I noticed the following: </p> <pre><code>LOG: statement: DELETE FROM "auth_user_groups" WHERE "auth_user_groups"."user_id" = 8 </code></pre> <p>A couple of statements later... </p> <pre><code>LOG: statement: INSERT INTO "auth_user_groups" ("user_id", "group_id") VALUES (8, 1) </code></pre> <p>So, it is properly being deleted, there is just something causing it to insert again?</p> <hr> <p>Update:</p> <p>Here is the repo/branch: <a href="https://github.com/jaycrossler/geoq-django/tree/guardian_setup/geoq" rel="nofollow">https://github.com/jaycrossler/geoq-django/tree/guardian_setup/geoq</a><br> Here is the specific location of the signal: <a href="https://github.com/jaycrossler/geoq-django/blob/guardian_setup/geoq/accounts/models.py" rel="nofollow">https://github.com/jaycrossler/geoq-django/blob/guardian_setup/geoq/accounts/models.py</a></p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USjackiekazil
    1. USjackiekazil
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. PODjango: m2m relationship is not getting updated in post_save signal
      1. USjackiekazil
      1. VTBountyStart
    2. VO
      singulars
      1. PODjango: m2m relationship is not getting updated in post_save signal
      1. This table or related slice is empty.
      1. VTBountyClose
    1. CODoes it work if you edit and save an existing user, but fail when creating a new one?
      singulars
      1. PODjango: m2m relationship is not getting updated in post_save signal
      1. USPeter DeGlopper
    2. COUpdated -- was supposed to be post_save, not pre_save, because relationship doesn't exist with new users. @PeterDeGlopper -- to answer your question, it doesn't work for existing users. It is never an option with new users, because new users are default not staff members and do not have permissions.
      singulars
      1. PODjango: m2m relationship is not getting updated in post_save signal
      1. USjackiekazil
    3. COCan you perhaps share your models (and any other overriding you are doing to the signals?)
      singulars
      1. PODjango: m2m relationship is not getting updated in post_save signal
      1. USyuvi
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload