I have two models, a MainModel and a related InlineModel that i'd like to show as an inline in the admin. This InlineModel can be used for, say, making notes about the model and should track the logged in admin user making changes. While this seems simple (and indeed, the docs show an example for this when the user field is part of the MainModel), I can't seem to grasp it when the field is on the Inline.
To be specific, my goal is:
And my questions:
Here are my current ideas:
#models.py
class MainModel(models.Model):
some_info = models.IntegerField()
class InlineModel(models.Model):
main = models.ForeignKey(MainModel)
data = models.CharField(max_length=255)
user = models.ForeignKey('auth.User')
#admin.py
class InlineModelInline(admin.TabularInline):
model = InlineModel
fields = ('data', 'user')
#readonly_fields = ('data', 'user') #Bonus question later
class MainModelAdmin(admin.ModelAdmin):
list_display = ('id', 'some_info')
inlines = [InlineModelInline]
#def save_model(self, request, obj, form, change):
#http://docs.djangoproject.com/en/dev/ref/contrib/admin/#django.contrib.admin.ModelAdmin.save_model
#Only called for MainModel, not for any of the inlines
#Otherwise, would be ideal
def save_formset(self, request, form, formset, change):
#http://docs.djangoproject.com/en/dev/ref/contrib/admin/#django.contrib.admin.ModelAdmin.save_formset
#Experimenting showd this is called once per formset (where the formset is a group of inlines)
#See code block at http://code.djangoproject.com/browser/django/tags/releases/1.2.1/django/contrib/admin/options.py#L894
if not isinstance(formset.model, InlineModel):
return super(MainModelAdmin, self).save_formset(request, form, formset, change)
instances = formset.save(commit=False)
for instance in instances:
if not instance.pk:
instance.user = request.user
instance.save()
formset.save_m2m()
I have solved the first half of my question:
def save_formset(self, request, form, formset, change):
if formset.model != InlineModel:
return super(MainModelAdmin, self).save_formset(request, form, formset, change)
instances = formset.save(commit=False)
for instance in instances:
if not instance.pk:
instance.user = request.user
instance.save()
formset.save_m2m()
Now i'm interested in the bonus behavior:
I'm required to select a user when adding a new inline due to validation rules. My best guess is to not include the 'user' field in my InlineModelInline.fields tuple, but then this won't show the author for existing InlineModel instances. (Edit: adding 'user' to readonly_fields works here)
(Edit) How can I make the existing inlines render 'data' as readonly, but still be able to edit it when adding a new inline?
It worked for me. This approach won't allow me to delete Inline items.
def save_formset(self, request, form, formset, change):
for form in formset.forms:
form.instance.user = request.user
formset.save()
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