Django的ModelForm unique_together验证 [英] Django's ModelForm unique_together validation

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本文介绍了Django的ModelForm unique_together验证的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我有一个看起来像这样的Django模型。

  class Solution(models.Model):
' ''
代表具体问题的解决方案。
'''
name = models.CharField(max_length = 50)
problem = models.ForeignKey(问题)
description = models.TextField(blank = True)
date = models.DateTimeField(auto_now_add = True)

class Meta:
unique_together =(name,problem)
pre>

我使用一个表单来添加如下所示的模型:

  class SolutionForm(forms.ModelForm):
class Meta:
model = Solution
exclude = ['problem']

我的问题是, SolutionForm 不验证解决方案 unique_together 约束,因此,它将返回一个 IntegrityError 试图保存的形式时。我知道我可以使用 validate_unique 来手动检查这一点,但是我想知道是否有任何方法可以在验证形式中捕获这一点,并自动返回一个表单错误。 >

谢谢。

解决方案

我设法解决这个问题,而不修改视图一个干净的方法我的形式:

  class SolutionForm(forms.ModelForm):
class Meta:
模型=解决方案
排除= [ '问题']

高清干净(个体经营):
cleaned_data = self.cleaned_data

尝试:
Solution.objects.get(name = clean_data ['name'],problem = self.problem)
除了Solution.DoesNotExist:
pass
else:
raise ValidationError('这个名称已经存在这个问题)

#解决方案总是返回cleaned_data
返回cleaned_data

在视图中我唯一需要做的是在执行 is_valid 之前在表单中添加一个问题属性。


I have a Django model that looks like this.

class Solution(models.Model):
    '''
    Represents a solution to a specific problem.
    '''
    name = models.CharField(max_length=50)
    problem = models.ForeignKey(Problem)
    description = models.TextField(blank=True)
    date = models.DateTimeField(auto_now_add=True)

    class Meta:
        unique_together = ("name", "problem")

I use a form for adding models that looks like this:

class SolutionForm(forms.ModelForm):
    class Meta:
        model = Solution
        exclude = ['problem']

My problem is that the SolutionForm does not validate Solution's unique_together constraint and thus, it returns an IntegrityError when trying to save the form. I know that I could use validate_unique to manually check for this but I was wondering if there's any way to catch this in the form validation and return a form error automatically.

Thanks.

解决方案

I managed to fix this without modifying the view by adding a clean method to my form:

class SolutionForm(forms.ModelForm):
    class Meta:
        model = Solution
        exclude = ['problem']

    def clean(self):
        cleaned_data = self.cleaned_data

        try:
            Solution.objects.get(name=cleaned_data['name'], problem=self.problem)
        except Solution.DoesNotExist:
            pass
        else:
            raise ValidationError('Solution with this Name already exists for this problem')

        # Always return cleaned_data
        return cleaned_data

The only thing I need to do now in the view is to add a problem property to the form before executing is_valid.

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