python - 无法访问模板中的foreignKey

Question

我正在尝试访问模板中的foreignKey 对象，但它根本不显示任何内容。

我想显示保存在数据库中的 ImageField 的 url

模型.py

class Usertasks(models.Model):
    TaskID = models.CharField(max_length=55)
    user = models.ForeignKey(User, unique=False, on_delete=models.CASCADE)
    TaskStatus = models.CharField(max_length=15, default="missing")

class TaskImages(models.Model):
    UserTasks = models.ForeignKey(Usertasks, related_name='images', on_delete=models.CASCADE)
    image = models.ImageField()

View .py

def task_info(request, taskid):
    task = Usertasks.objects.get(TaskID=taskid)
    taskhtml = Usertasks.objects.filter(TaskID=taskid)
    files = os.listdir(task.OutputPath)
    fullpath = task.OutputPath
    print(files)
    for img in files:
        imagepath = fullpath + "/" + img
        task_image = TaskImages()
        task_image.UserTasks = task
        task_image.image = imagepath
        task_image.save()
    return render(request, 'dashboard/task.html', {'query':taskhtml})

html

{% for item in query.image_set.all %}

<img src="{{ item.url }}">

{% endfor %}

Answer 1

您已为 TaskImages 中的 UserTasks 设置了 lated_name kwarg。因此，您可以使用该值来代替 _set

https://docs.djangoproject.com/en/2.2/ref/models/fields/#django.db.models.ForeignKey.related_name

https://docs.djangoproject.com/en/2.2/topics/db/queries/#following-relationships-backward

You can override the FOO_set name by setting the related_name parameter in the ForeignKey definition.

对于您的问题，您需要使用 query.images，而不是 image_set