How to provide an inline model field with a queryset choices without losing field value for inline r
- by Judith Boonstra
The code displayed below is providing the choices I need for the app field, and the choices I need for the attr field when using Admin.
I am having a problem with the attr field on the inline form for already saved records. The attr selected for these saved does show in small print above the field, but not within the field itself.
#
MODELS:
Class Vocab(models.Model):
entity = models.Charfield, max_length = 40, unique = True)
Class App(models.Model):
name = models.ForeignKey(Vocab, related_name = 'vocab_appname', unique = True)
app = SelfForeignKey('self, verbose_name = 'parent', blank = True, null = True)
attr = models.ManyToManyField(Vocab, related_name = 'vocab_appattr', through ='AppAttr'
def parqs(self):
a method that provides a queryset consisting of available apps from vocab,
excluding self and any apps within the current app's dependent line.
def attrqs(self):
a method that provides a queryset consisting of available attr from vocab
excluding those already selected by current app, 2) those already selected
by any apps within the current app's parent line, and 3) those selected by
any apps within the current app's dependent line.
Class AppAttr(models.Model):
app = models.ForeignKey(App)
attr = models.ForeignKey(Vocab)
#
FORMS:
from models import AppAttr
def appattr_form_callback(instance, field, *args, **kwargs)
if field.name = 'attr':
if instance:
return field.formfield(queryset = instance.attrqs(), *kwargs)
return field.formfield(*kwargs)
#
ADMIN:
necessary imports
class AppAttrInline(admin.TabularInline):
model = AppAttr
def get_formset(self, request, obj = None, **kwargs):
kwargs['formfield_callback'] = curry(appattr_form_callback, obj)
return super(AppAttrInline, self).get_formset(request, obj, **kwargs)
class AppForm(forms.ModelForm):
class Meta:
model = App
def __init__(self, *args, **kwargs):
super(AppForm, self).__init__(*args, **kwargs)
if self.instance.id is None:
working = App.objects.all()
else:
thisrec = App.objects.get(id = self.instance.id)
working = thisrec.parqs()
self.fields['par'].queryset = working
class AppAdmin(admin.ModelAdmin):
form = AppForm
inlines = [AppAttrInline,]
fieldsets = ..........
necessary register statements
