Django，过滤当前登录用户以多对多模型形式显示的集合

问题描述

我知道它在某个地方，但是找不到.

I know it's there somewhere but I can't find it.

因此，我有一个类别"模型和一个书籍"模型，其中有许多到类别".当以模型形式创建新书时，所有类别都将显示给用户以分配给该书.在那种情况下，我只希望当前用户创建的类别显示在该字段中，而不是所有类别.

So I have a 'category' model and a 'book' model which has a many to many to 'category'. When creating a new book in a modelform, all the categories are presented to the user to assign to the book. In that case I want only the categories created by the current user to show up in that field, not all the categories.

什么是最好的方法?

推荐答案

假设您的模型如下:

class Category(models.Model):
    ....
    creator = models.ForeignKey(User)

class Book(models.Model):
    ...
    categories = models.ManyToManyField(Category)

假设您的表单如下:

class BookForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):
        current_user = kwargs.pop('user')
        super(BookForm, self).__init__(*args, **kwargs)
        self.fields['categories'].queryset = Categories.objects.filter(creator=current_user)

因此，您需要覆盖表单的__init__，将当前用户传递给此表单.然后在所需的ManyToManyField上设置queryset属性.

So, you need to overide __init__ of your form, pass the current user to this form. And then set a queryset attribute on the ManyToManyField you want.

您的视图:

#GET request
book_form = BookForm(user=request.user)

#POST request
book_form = BookForm(data=request.POST, user=request.user)

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