Django在修改ModelForm的查询集时传递信息 [英] Django, passing information when modifying queryset for ModelForm

问题描述

数据库：
文档有许多部分，部分有许多评论

Database: Document has many Sections, Sections has many Comments

在每个文档页面上都有一个注释表单，可以让您选择该部分使用ModelChoiceField）。问题是ModelChoiceField将包含所有文档的所有部分。

On each document page, there is a comment form that lets you pick the section (using a ModelChoiceField). The problem is that the ModelChoiceField will contain ALL sections for all documents.

所以要限制他们，我这样做：

So to limit them I do this:

class CommentForm(ModelForm):
    def __init__(self, *args, **kwargs):
        super(CommentForm, self).__init__(*args, **kwargs)
        if self.instance:
            logger.debug(self.instance.document_id) # Prints "None"
            self.fields['section'].queryset = Section.objects.filter(document=self.instance.document)
            # ^^^ Throws DoesNotExist as self.instance.document is None

，我的看法只是：

form = CommentForm()

如何传递CommentForm文档ID？

How do I pass CommentForm a document id?

编辑：在我的看法中尝试：

d = Document.objects.get(id=id)
c = Comment(d)
form = CommentForm(c)

但是document_id仍然没有评论表单

but document_id is still None in CommentForm

推荐答案

您可以在初始化表单时传递文档ID：

You can pass the document id when initialising the form:

class CommentForm(ModelForm):
    def __init__(self, doc_id=None, *args, **kwargs):
        if doc_id:
            self.fields['section'].queryset = Section.objects.filter(document__id=doc_id)

在视图中

def my_view(request):
    ...
    doc = Document.objects(...)
    form = CommentForm(doc_id = doc.id)

---

编辑

我编辑的第二行视图，我认为处理您的评论？ （make doc.id）关键字arguement

I edited the second line of the view, which I think deals with your comment? (make doc.id) a keyword arguement

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