Opened 8 years ago

Closed 8 years ago

#15096 closed (wontfix)

Add post_form_save signal

Reported by: James Dabbs Owned by: James Dabbs
Component: Uncategorized Version: master
Severity: Keywords: signals
Cc: Triage Stage: Unreviewed
Has patch: yes Needs documentation: yes
Needs tests: yes Patch needs improvement: yes
Easy pickings: no UI/UX: no


Several people (see stackoverflow, #13950, django-developers) have had trouble with / questions about model post_save signals and m2m fields. Personally, I've got a model where the objects almost never change, but every time one is added, I need to run a (relatively expensive) callback function which depends on the entire collection of related objects. Unfortunately, the model's post_save signal fires before the m2m fields are populated, and it's wasteful to run the callback function after every m2m_changed, since only the last change matters.

I propose adding a post_form_save signal to any ModelForm that fires after the form's save_m2m method has been called. That will allow the sort of m2m batch processing that I (and this gentleman) are looking for.

Attachments (1)

post_form_save.diff (1.3 KB) - added by James Dabbs 8 years ago.

Download all attachments as: .zip

Change History (3)

Changed 8 years ago by James Dabbs

Attachment: post_form_save.diff added

comment:1 Changed 8 years ago by James Dabbs

Has patch: set
Needs documentation: set
Needs tests: set
Owner: changed from nobody to James Dabbs
Patch needs improvement: set
Status: newassigned

comment:2 Changed 8 years ago by Russell Keith-Magee

Resolution: wontfix
Status: assignedclosed

discussion on Django-dev

Marking wontfix.

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