Overriding Size of Django Admin Multi-select Widget

Question

Newbie Django question: I\'d like the Django admin to display more rows of choices in the multi-select widget. I have an extremely long list to select from and the default 4

Answer 1

I did this in the admin.py by setting a blanket size for all ManyToManyField items, for instance:

from django.contrib import admin
from django.forms import SelectMultiple
from django.db import models
from models import *

class RiverAdmin(admin.ModelAdmin):
    formfield_overrides = { models.ManyToManyField: {'widget': SelectMultiple(attrs={'size':'10'})}, }

admin.site.register(River, RiverAdmin)