Question

我一直在寻找答案，但是其中任何一个对我都很有用。问题是我想用以下HTML代码显示 non_field_error ：

{% if form.non_field_errors %}
        <div class="alert alert-danger">{{ form.non_field_errors|join:"<br \>" }}</div>
{% endif %}

这将产生以下结果： The duplicated error, one formatted and the other not

这是我的 forms.py 代码：

 user = authenticate(username=username, password=password)
        if not user or not user.is_active:
            self.add_error(None, "Incorrect credentials")

如何仅显示格式化的字段，而不同时显示两者？

更新： 如果我尝试这种方法：

{% if form.non_field_errors %}
    {% for error in form.non_field_errors %}
        <div class="alert alert-danger">{{ error }}</div>
    {% endfor %}
{% endif %}

我大致遇到相同的问题：The same error. It appears twice

Answer 1

如果non_field_errors是一个列表，则可以使用django的每种语法，而不是使用
标记将它们连接在一起，例如：

-(void)initialseTimerNotificationData{

    UNMutableNotificationContent *content = [UNMutableNotificationContent new];
    content.title = @"Title";
    content.body = @"A Message";
    content.sound = [UNNotificationSound defaultSound];
    content.accessibilityHint = @"NotificationCategory";

    NSURL *imgUrl = [[NSBundle mainBundle] URLForResource:@"notification" withExtension:@"png"];
    NSError *attachmentError = nil;
    UNNotificationAttachment *attachment = [UNNotificationAttachment attachmentWithIdentifier:@"" URL:imgUrl options:@{UNNotificationAttachmentOptionsTypeHintKey: @"kUTTypePNG"} error:&attachmentError];
    content.attachments = @[attachment];

    [self addNotificationAction];
    // category identifier should be unique. As diff
    content.categoryIdentifier = @"NotificationCategory";

    // convert string to date


NSDateComponents *componenets = [[NSCalendar currentCalendar] components:NSCalendarUnitSecond + NSCalendarUnitNanosecond fromDate:[NSDate date]];

for (int i= 0; i< minuteArrayList.count; i++) {

componenets.hour = 0;
componenets.minute = [listArray objectAtInde:i];
UNCalendarNotificationTrigger* trigger = [UNCalendarNotificationTrigger
triggerWithDateMatchingComponents:componenets repeats:NO];

    [center addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) {

        if (error) {
            NSLog(@":%@", error.localizedDescription);
        }

    }];
}

还没有测试过，但这就是一般想法，我相信语法正确

Answer 2

我有相同的探针，我发现是因为我有{{ form }} django标签，该标签也加载了non_field_errors，所以我不得不像这样手动渲染它

{{ form.non_field_errors }}
{{ form.label }}
{{ form.field_name }}

Django Non_Field_Error显示重复的Bootstrap

2 个答案: