Prepopulating inlines based on the parent model in the Django Admin
- by Alasdair
I have two models, Event and Series, where each Event belongs to a Series. Most of the time, an Event's start_time is the same as its Series' default_time.
Here's a stripped down version of the models.
#models.py
class Series(models.Model):
name = models.CharField(max_length=50)
default_time = models.TimeField()
class Event(models.Model):
name = models.CharField(max_length=50)
date = models.DateField()
start_time = models.TimeField()
series = models.ForeignKey(Series)
I use inlines in the admin application, so that I can edit all the Events for a Series at once.
If a series has already been created, I want to prepopulate the start_time for each inline Event with the Series' default_time. So far, I have created a model admin form for Event, and used the initial option to prepopulate the time field with a fixed time.
#admin.py
...
import datetime
class OEventInlineAdminForm(forms.ModelForm):
start_time = forms.TimeField(initial=datetime.time(18,30,00))
class Meta:
model = OEvent
class EventInline(admin.TabularInline):
form = EventInlineAdminForm
model = Event
class SeriesAdmin(admin.ModelAdmin):
inlines = [EventInline,]
I am not sure how to proceed from here. Is it possible to extend the code, so that the initial value for the start_time field is the Series' default_time?
