django模型形成过滤器查询

问题描述

我有以下模型：

class Article(models.Model):

   title = models.CharField()
   description = models.TextField()
   author = models.ForeignKey(User)


class Rating(models.Model):

    value = models.IntegerField(choices=RATING_CHOICES)
    additional_note = models.TextField(null=True, blank=True)
    from_user = models.ForeignKey(User, related_name='from_user')
    to_user = models.ForeignKey(User, related_name='to_user')
    rated_article = models.ForeignKey(Article, null=True, blank=True)
    dtobject = models.DateTimeField(auto_now_add=True)

根据上述模型，我创建了一个模型窗体，如下所示：

Based upon the above model, i have created a model form, as follows:

模型表单：

class RatingForm(ModelForm):

     class Meta:
          model = Rating
          exclude = ('from_user', 'dtobject')

排除 from_user ，因为 request.user 是$ code> from_user 。

Excluding from_user because the request.user is the from_user.

表单呈现良好，但在下拉字段中的 to_user 中，作者也可以评价自己。所以我想要将current_user的名称填入下拉字段。我如何做？

The form renders well, but in to_user in the dropdown field, the author can rate himself as well. So i would want the current_user's name to populate in the dropdown field. How do i do it?

推荐答案

覆盖 __ init __ 删除当前用户从 to_user 选择。

Override __init__ to remove current user from the to_user choices.

更新：更多说明

ForeignKey使用 ModelChoiceField ，其选择是查询。因此，在 __ init __ 中，您必须从 to_user 的查询器中删除当前用户。

ForeignKey uses ModelChoiceField whose choices are queryset. So in __init__ you have to remove the current user from to_user's queryset.

更新2：示例

class RatingForm(ModelForm):
    def __init__(self, current_user, *args, **kwargs):
        super(RatingForm, self).__init__(*args, **kwargs)
        self.fields['to_user'].queryset = self.fields['to_user'].queryset.exclude(id=current_user.id)

    class Meta:
        model = Rating
        exclude = ('from_user', 'dtobject')

现在在您创建的视图中 RatingForm object pass request.user 作为关键字参数 current_user 这样。

Now in the view where you create RatingForm object pass request.user as keyword argument current_user like this.

form = RatingForm(current_user=request.user)

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