django，使用唯一字段编辑表单，form.is_valid return false

Question

class modelA(..):
    fieldA = ...     unique
    fieldB = ...     unique

    class Meta:
        unique_together = [['fieldA','fieldB']]


class formA(modelform):

    class Meta:
        model = modelA
        field = ['fieldA','fieldB']


def viewA(request):
    if request.method == 'POST':
        form = formA(request.POST)
        if form.is_valid():          here return false !!!!!
            ......

在编辑表单中，点击提交按钮更新数据库时，form.is_valid() return false 因为unique_together检查, 如何解决问题？

Answer 1

您应该将 instance 参数与您要编辑的模型实例一起传递：

from django.shortcuts import get_object_or_404

def viewA(request, pk):
    obj = get_object_or_404(modelA, pk=pk)
    if request.method == 'POST':
        form = formA(request.POST, instance=obj)
        if form.is_valid():
            ...

django，使用唯一字段编辑表单，form.is_valid return false

django,edit form with unique field, form.is_valid return false

forms

django

unique