Django-UpdateView表单无法保存

问题描述

我在 CBV （ UpdateView ）中使用表单的代码在单击<$ c时不会保存到数据库中$ c>提交按钮。我看不出有什么问题。

My code for using forms inside CBV(UpdateView) won't save to DB when clicking Submit button. I don't see what's wrong.

views.py

class BHA_UpdateView(UpdateView):
    template_name = 'bha_test.html'
    context_object_name = 'bha'
    model = BHA_List
    success_url = reverse_lazy('well_list')
    pk_url_kwarg = 'pk_alt'
    form_class = BHA_overall_Form

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        api = get_well_api(self.request)
        context['single_well_bha_list'] = BHA_List.objects.filter(well=api)
        return context

    def form_valid(self, form):
        self.object = form.save()
        return super().form_valid(form)

models.py

class WellInfo(models.Model):
    api = models.CharField(max_length=100, primary_key=True)
    well_name = models.CharField(max_length=100)
    status = models.CharField(max_length=100)

class BHA_List(models.Model):
    well = models.ForeignKey(WellInfo, 'CASCADE', related_name='bha_list')
    bha_number = models.CharField(max_length=100)

class BHA_overall(models.Model):
    bha_number = models.ForeignKey(BHA_List, 'CASCADE', related_name='bha_overall')
    drill_str_name = models.CharField(max_length=111)
    depth_in = models.CharField(max_length=111)

bha_test.html

<form method="POST">
  {% csrf_token %}
  {{ form.as_p }}
  <input type="submit" class='btn btn-primary' value="Submit">
</form>

forms.py

from django import forms
from contextual.models import BHA_overall

class BHA_overall_Form(forms.ModelForm):
    class Meta():
        model = BHA_overall
        fields = '__all__'

model = BHA_List ，还有另一种通过外键与模型相关的形式。表单字段将显示给用户，单击提交按钮后，应将用户输入保存到数据库，但不会。

So there is a model = BHA_List, and there is another form that is related to the model by a foreign key. The form fields will be displayed to the users, and upon clicking a submit button, it should save the user input to DB, but it doesn't. What's wrong?

推荐答案

您的ModelForm模型与您的UpdateView模型不匹配

Your ModelForm model doesn't match your UpdateView Model

您使用以下方式声明您的ModelForm：

You are declaring your ModelForm with:

model = BHA_Overall

您的UpdateView具有：

Your UpdateView has:

model = BHA_List

请记住，UpdateViews使用model =执行查询集，因此它们可以将Model实例分配给ModelForm，最可能的是不匹配，因为它们是不同的型号。

Do remember that UpdateViews execute a queryset with model= so they can assign a Model instance to the ModelForm, most likely there is not match as they are different models.

此外，如果您不进行额外的验证或修改ModelForm.instance，则无需在UpdateView中覆盖form_valid方法。

Also, if you are not doing extra validations or modifyng the ModelForm.instance you don't need to override form_valid method in the UpdateView.

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