我使用的是 Django 1.5.5。为我的项目。我有一些模型,其中一些模型与另一个模型具有多对多字段:
class ScreeningFormat(CorecrmModel):
name = models.CharField(max_length=100)
class Film(CorecrmModel):
title = models.CharField(max_length=255)
screening_formats = models.ManyToManyField(ScreeningFormat)
class Screen(CorecrmModel):
name = models.CharField(max_length=100)
screening_formats = models.ManyToManyField(ScreeningFormat)
class FilmShow(CorecrmModel):
film = models.ForeignKey(Film)
screen = models.ForeignKey(Screen)
screening_formats = models.ManyToManyField(ScreeningFormat)
我为 FilmShow 创建了一个自定义管理表单,它有一个 clean_screening_formats
方法:
class FilmShowAdminForm(admin.ModelForm):
def clean_screening_formats(self):
# Make sure the selected screening format exists in those marked for the film
screening_formats = self.cleaned_data['screening_formats']
film_formats = self.cleaned_data['film'].screening_formats.all()
sf_errors = []
for (counter, sf) in enumerate(screening_formats):
if sf not in film_formats:
sf_error = forms.ValidationError('%s is not a valid screening format for %s' % (sf.name, self.cleaned_data['film'].title), code='error%s' % counter)
sf_errors.append(sf_error)
if any(sf_errors):
raise forms.ValidationError(sf_errors)
return formats
实际的验证检查工作正常,但管理表单上这些错误消息的输出有点不正常。而单个错误消息输出为(例如):
This field is required.
消息列表的输出如下所示:
[u'35mm Film is not a valid screening format for Thor: The Dark World']
[u'Blu Ray is not a valid screening format for Thor: The Dark World']
谁能建议我如何正确显示这些错误消息列表?
编辑: 我认为这个问题是由于当出现多个错误时 django 存储消息的方式略有不同。示例:
>>> from django import forms
>>> error = forms.ValidationError('This is the error message', code='lone_error')
>>> error.messages
[u'This is the error message']
>>> e1 = forms.ValidationError('This is the first error message', code='error1')
>>> e2 = forms.ValidationError('This is the second error message', code='error2')
>>> error_list = [e1, e2]
>>> el = forms.ValidationError(error_list)
>>> el.messages
[u"[u'This is the first error message']", u"[u'This is the second error message']"]
这可能是 Django 中的错误吗?
最佳答案
您所做的实现仅对 Django 1.6+ 有效。比较:1.6 docs至 1.5 .
在 1.6 之前,消息在 django.core.exceptions.ValidationError
中被立即转换为字符串(参见代码 here ):
class ValidationError(Exception):
"""An error while validating data."""
def __init__(self, message, code=None, params=None):
import operator
from django.utils.encoding import force_text
"""
ValidationError can be passed any object that can be printed (usually
a string), a list of objects or a dictionary.
"""
if isinstance(message, dict):
self.message_dict = message
# Reduce each list of messages into a single list.
message = reduce(operator.add, message.values())
if isinstance(message, list):
self.messages = [force_text(msg) for msg in message] #! Will output "u'<message>'"
在您的例子中,不是传递 ValidationError
实例列表,而是传递字符串列表:
>>> e1 = 'This is the first error message'
>>> e2 = 'This is the second error message'
>>> error_list = [e1, e2]
>>> el = forms.ValidationError(error_list)
>>> el.messages
[u'This is the first error message', u'This is the second error message']
关于Django:正确显示一个字段的多个错误消息,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19770705/