[英]Django Admin: Limit query-set selection for a inline form
我有一個 Django 管理表單和一個內聯表單,如下所示。 它有許多領域。 models Place
有photos = models.ManyToManyField(Photo)
,而Photo
是另一個 Django model。
問題是我有太多Photo
實例,單擊我在 Django 管理員下編輯表單,我得到一個包含所有 Photo 實例選擇的下拉列表。
如何限制僅與Place
有關系的選擇?
class Photoinline(admin.TabularInline):
model = Place.photos.through
extra = 1
readonly_fields = ('preview', 'my_order',)
def preview(self, obj):
if obj.photo:
id = obj.photo_id
photo = Photo.objects.get(id=id)
return mark_safe('<img src="/media/%s" width="150" />' % (photo.photo))
else:
return mark_safe('Empty, please upload an image')
def my_order(self, obj):
id = obj.photo_id
photo = Photo.objects.get(id=id)
if not photo.order:
return ""
return photo.order
class PlaceAdmin(admin.ModelAdmin):
list_display = ('name', 'city', 'state', 'country')
exclude = ('photos',)
formfield_overrides = {
models.ForeignKey: {'widget': Select(attrs={'style':'width: 350px;'})},
models.FloatField: {'widget': Select(attrs={'style':'min-width: 350px;'})},
models.URLField: {'widget': TextInput(attrs={'style':'width: 350px;'})},
models.CharField: {'widget': TextInput(attrs={'style':'width: 350px;'})},
models.TextField: {'widget': Textarea(attrs={'style':'width: 350px;height: 38px;'})}
}
inlines = [
Photoinline,
]
您需要保存父表單正在更新的Place object 的副本,並使用該 object 作為線索來限制內聯 forms 的照片表單字段的選擇。
class Photoinline(admin.TabularInline):
model = Place.photos.through
extra = 1
readonly_fields = ('preview', 'my_order',)
def preview(self, obj):
if obj.photo:
id = obj.photo_id
photo = Photo.objects.get(id=id)
return mark_safe('<img src="/media/%s" width="150" />' % (photo.photo))
else:
return mark_safe('Empty, please upload an image')
def my_order(self, obj):
id = obj.photo_id
photo = Photo.objects.get(id=id)
if not photo.order:
return ""
return photo.order
def formfield_for_foreignkey(self, db_field, request=None, **kwargs):
formfield = super(Photoinline, self).formfield_for_foreignkey(db_field, request, **kwargs)
if db_field.name == 'photo':
if request._place_obj is not None:
formfield.queryset = formfield.queryset.filter(place__exact = request._place_obj)
else:
formfield.queryset = formfield.queryset.none()
return formfield
class PlaceAdmin(admin.ModelAdmin):
list_display = ('name', 'city', 'state', 'country')
exclude = ('photos',)
formfield_overrides = {
models.ForeignKey: {'widget': Select(attrs={'style':'width: 350px;'})},
models.FloatField: {'widget': Select(attrs={'style':'min-width: 350px;'})},
models.URLField: {'widget': TextInput(attrs={'style':'width: 350px;'})},
models.CharField: {'widget': TextInput(attrs={'style':'width: 350px;'})},
models.TextField: {'widget': Textarea(attrs={'style':'width: 350px;height: 38px;'})}
}
inlines = [
Photoinline,
]
def get_form(self, request, obj=None, **kwargs):
request._place_obj = obj
return super(PlaceAdmin, self).get_form(request, obj, **kwargs)
這個答案可以幫助你了解更多細節: https://stackoverflow.com/a/4236159/11326730
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