显示唯一字段的Django错误消息

Question

当重复条目尝试保存时,我想更改默认错误消息,因为它们应该是唯一的,即unique=True.很像这样:

email = models.EmailField(unique=True, error_messages={'unique':"This email has already been registered."})

但是,unique在上面的情况下是猜测,并不起作用.我也无法找出错误的名称实际上是什么.有谁知道正确的名字？

请注意,此验证是模型级别,而不是表单验证.

编辑:更多信息,目前显示当前错误消息form.errors:

[model_name] with this [field_label] already exists

哪个不是非常用户友好,所以我想覆盖它...

Answer 1

非常感谢你.

email = models.EmailField(unique=True, error_messages={'unique':"This email has already been registered."})

这个现在效果很好.

如果您想自定义error_messages invalided,请执行此操作forms.ModelForm

email = forms.EmailField(error_messages={'invalid': 'Your email address is incorrect'})

但是,如本所述,unique消息应该在model现场定制

email = models.EmailField(unique=True, error_messages={'unique':"This email has already been registered."})

Answer 2

此错误消息显然在django/db/models/base.py文件中是硬编码的.

def unique_error_message(self, model_class, unique_check):
    opts = model_class._meta
    model_name = capfirst(opts.verbose_name)

    # A unique field
    if len(unique_check) == 1:
        field_name = unique_check[0]
        field_label = capfirst(opts.get_field(field_name).verbose_name)
        # Insert the error into the error dict, very sneaky
        return _(u"%(model_name)s with this %(field_label)s already exists.") %  {
            'model_name': unicode(model_name),
            'field_label': unicode(field_label)
        }
    # unique_together
    else:
        field_labels = map(lambda f: capfirst(opts.get_field(f).verbose_name), unique_check)
        field_labels = get_text_list(field_labels, _('and'))
        return _(u"%(model_name)s with this %(field_label)s already exists.") %  {
            'model_name': unicode(model_name),
            'field_label': unicode(field_labels)
        }

解决此问题的一种方法是创建从EmailField派生的自定义模型,并覆盖unique_error_message方法.但要注意,升级到较新版本的Django时可能会破坏它.