Django 使用模型实例启动表单字段

发布于 2024-12-05 18:15:02 字数 944 浏览 0 评论 0原文

我觉得这看起来很平常，并感到惊讶。

我拥有的

是 Django 模型 + 表单（ModelForm）。

我的用户填写了表单，在我看来，我有通常的情况：

    if request.POST:
        form = myForm(request.POST)
    if request.method == "POST" and form.is_valid():
        result = form.save(commit=False)

现在我需要大量操作表单的某些字段（在“结果”对象中），并且我想检查表单<保存之前再次 code>is_valid() 。

问题

我尝试使用字典（如建议的这里)

result_dictionary = dict((x.name, getattr(result, x.name)) for x in result._meta.fields)

或

result_dictionary = model_to_dict(result, fields=[field.name for field in result._meta.fields])

加上

testForm = myForm(initial=result_dictionary)

，但它没有通过 is_valid() 并且不会给出任何错误！ 这些字段已正确传递到新表单...

有什么想法吗？

原文

I thought it looks trivial, and was surprised.

What I have

I have a Django model + form (ModelForm).

My user fills in the form, and on my view I have the usual:

    if request.POST:
        form = myForm(request.POST)
    if request.method == "POST" and form.is_valid():
        result = form.save(commit=False)

Now I need to heavily manipulate some fields of the form (in the "result" object) and I want to check the forms is_valid() again before saving.

The Problem

I tried to create a new form using the "result" object (that is a ModelForm object) using a dictionary (as suggested here)

result_dictionary = dict((x.name, getattr(result, x.name)) for x in result._meta.fields)

result_dictionary = model_to_dict(result, fields=[field.name for field in result._meta.fields])

plus

testForm = myForm(initial=result_dictionary)

but it doesn't pass is_valid() and does'nt give any errors!
The fields are passed OK to the new form...

Any ideas?

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凉城已无爱 2024-12-12 18:15:02

有时，查看 Django 源代码确实很有帮助，这里是 BaseForm.is_valid()：

def is_valid(self):
    """
    Returns True if the form has no errors. Otherwise, False. If errors are
    being ignored, returns False.
    """
    return self.is_bound and not bool(self.errors)

因此，如果没有错误，is_valid() 将返回 false，因为您没有绑定表单后，您还没有在任何地方提供表单来查找数据。尝试使用 form.data 字典，如下所示：

if request.POST:
    form = myModel(request.POST)
if request.method == "POST" and form.is_valid():
    form.data['field1'] = 'Changing this'
    form.data['field2'] = 34

    testform = myModel(data=form.data)

Sometimes, looking in the Django source can be really helpful, here's BaseForm.is_valid():

def is_valid(self):
    """
    Returns True if the form has no errors. Otherwise, False. If errors are
    being ignored, returns False.
    """
    return self.is_bound and not bool(self.errors)

So if there are no errors, is_valid() returns false because you haven't bound the form, you haven't given the form anywhere to look for data. Try using the form.data dictionary instead, something like this:

if request.POST:
    form = myModel(request.POST)
if request.method == "POST" and form.is_valid():
    form.data['field1'] = 'Changing this'
    form.data['field2'] = 34

    testform = myModel(data=form.data)

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