Django简单标记在if条件下不起作用

Question

我想自定义django-admin的视频对象的更改表单添加块与审查工具。

当我在if条件中使用自定义simpletags时-它不起作用。

models.py：

class Video(models.Model):

    class Meta:
        db_table = 'video'

    DRAFT = 1
    MODERATION = 2
    PUBLISHED = 3
    REJECTED = 4
    HOSTING_UPLOADING = 5
    SUSPICIOUS = 6

    PUBLICATION_STATUSES = (
        (DRAFT, 'draft'),
        (MODERATION, 'moderation'),
        (PUBLISHED, 'published'),
        (HOSTING_UPLOADING, 'hosting uploading'),
        (REJECTED, 'rejected'),
        (SUSPICIOUS, 'suspicious')
    )

    video_pk = models.AutoField(primary_key=True)
    name = models.CharField(max_length=150, blank=True)
    hosting_id = models.CharField(max_length=20, blank=True)
    publication_status = models.PositiveSmallIntegerField(choices=PUBLICATION_STATUSES, default=MODERATION)

模板标记video_publication_statuses.py：

from api.models import Video
from django import template

register = template.Library()

@register.simple_tag
def moderation(status):
    return status == Video.MODERATION


@register.simple_tag
def suspicious(status):
    return status == Video.SUSPICIOUS


@register.simple_tag
def published(status):
    return status == Video.PUBLISHED


@register.simple_tag
def hosting_uploading(status):
    return status == Video.HOSTING_UPLOADING


@register.simple_tag
def rejected(status):
    return status == Video.REJECTED

change_form.html：

{% extends "admin/change_form.html" %}
{% load video_publication_statuses %}
{% suspicious original.publication_status as suspicious_status %}
{% moderation original.publication_status as moderation_status %}
{% hosting_uploading original.publication_status as hosting_uploading_status %}
{% published original.publication_status as published_status %}
{% rejected original.publication_status as rejected_status %}

{% block after_related_objects %}
  {% if original.pk %}
    {% for fieldset in adminform %}
      {% if fieldset.name == 'Moderation' %}
        {% include "admin/includes/fieldset.html" %}
      {% endif %}
    {% endfor %}
    <div class="submit-row">
      {% if rejected_status or moderation_status or suspicious_status %}
        <input type="submit" value="Publish" name="publish" >
      {% endif %}
      {% if published_status %}
        <input type="submit" value="Reject" name="reject" >
      {% endif %}
    </div>
  {% endif %}
{% endblock %}

当我使用显式的值而不是标记时，它是有效的：

  {% if original.publication_status == 3 %}
    <input type="submit" value="Reject" name="reject" >
  {% endif %}

请告诉我标签出了什么问题？

Answer 1

我相信这种情况的发生是因为模板标签传递字符串，而您正在根据整数检查字符串，例如return "3" == 3

不过从广义上讲，您在模板中放入了很多逻辑，我通常会避免这种情况。模板标记是为“表示逻辑”保留的，我将其理解为“改变事物呈现的方式”，而不是改变查看的内容。该逻辑属于视图或模型本身。

把这个逻辑放在你的模型上应该很容易。

class Original(...):
  def rejected(self):
    return self.status == Video.rejected