清理类型为URLField的数据 [英] Cleaning data which is of type URLField

问题描述

我的模型中有一个简单的URLField

I have a simple URLField in my model

link = models.URLField(verify_exists = False, max_length = 225)

我想从字段中删除前导和尾随空格。我不认为我可以在clean_fieldname或clean方法中执行此操作。

I would like to strip the leading and trailing spaces from the field. I don't think I can do this in "clean_fieldname" or in the "clean" method.

我需要对URLField进行子类化，并删除to_python方法中的空格吗？有没有更好的方式来做这个没有任何分类？

Do I need to sub-class the "URLField" and remove the spaces in to_python method? Is there a better way to do this without any sub-classing?

已编辑

这是我的表单

class StoryForm(forms.ModelForm):

    title = forms.CharField(max_length=225, error_messages={'required' : 'Enter a title for the story'})
    link = forms.URLField(max_length=225, error_messages={'required' : 'Enter a link to the story', 'invalid' : 'Enter a valid link like www.ted.com'})

    class Meta:
        model = models.Story
        fields = ('title', 'link')

    def clean_link(self):
        link = self.cleaned_data['link']
        return link.strip()

和我的模型

class Story(models.Model):
    title = models.CharField(max_length = 225)
    link = models.URLField(verify_exists = False, max_length = 225)

推荐答案

我做了一个快速实验，发现您可以使用 clean _ 方法来删除前导/尾随空格。如下所示：

I did a quick experiment and found out that you can indeed use a clean_ method to remove leading/trailing spaces. Something like this:

# models.py
class UrlModel(models.Model):
    link = models.URLField(verify_exists = False, max_length = 225)

    def __unicode__(self):
        return self.link

# forms.py 
class UrlForm(ModelForm):
    class Meta:
        model = UrlModel

    def clean_link(self):
        link  = self.cleaned_data['link']
        return link.strip()

# shell
In [1]: from test_app.forms import UrlForm

In [2]: f = UrlForm(data = dict(link = '  http://google.com  '))

In [3]: f.is_valid()
Out[3]: True

In [4]: f.save()
Out[4]: <UrlModel: http://google.com>

更新

我收到一条错误，说输入有效的链接，如www.ted.com。我编辑了我的问题，并包含了有关的模型和表单。

I get an error saying "Enter a valid link like www.ted.com". I edited my question and included the model and form in question.

我验证了您的表单类确实提供了错误。

I verified that your form class does give the error.

在做了一个小的改动后，我能够使其工作。我所做的是删除自定义标题和链接字段。我们正在使用这里的模型表单，底层模型已经有这些领域。我相信重新定义会导致在调用自定义清除方法之前提出验证错误。

After making a small change I was able to make it work. All I did was remove the custom title and link fields. We are working with a model form here and the underlying model already has these fields. I believe the redefinition led to a validation error being raised before the custom clean method was invoked.

class StoryForm(forms.ModelForm):
    class Meta:
        model = Story
        fields = ('title', 'link')

    def clean_link(self):
        link = self.cleaned_data['link']
        return link.strip()

这是Shell的一些示例输出：

Here is some sample output from the shell:

In [1]: from test_app.forms import StoryForm

In [2]: data = dict(title="Google story", link  = "   http://google.com ")

In [3]: f = StoryForm(data)

In [4]: f.is_valid()
Out[4]: True

In [5]: f.save()
Out[5]: <Story: Google story http://google.com>

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