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python - 扩大在活动结束后将帖子下线的可能性

问题描述

我正在尝试使用以下代码扩展我在这个问题中展示的功能：

@property
def is_expired(self):
    print(self.publishing_date)
    if self.membership == "One Month":
        if self.publishing_date + datetime.timedelta(days=30) < datetime.datetime.now():
            message = 'Scaduto'
            return message
        else:
            expiring_date = self.publishing_date + datetime.timedelta(days=30)
            delta = expiring_date - datetime.datetime.now()
            return delta
    else:
        if self.publishing_date + datetime.timedelta(days=365) < datetime.datetime.now():
            message = 'Scaduto'
            return message
        else:
            expiring_date = self.publishing_date + datetime.timedelta(days=365)
            delta = expiring_date - datetime.datetime.now()
            return delta
    return False

我想使用这个新模板：

  {% for asset in user_details.authorized_user_set.all %}
    {% if not asset.is_expired %}
    <tr>
      <td class="text-left"><p><strong><a class="text-info" href="{{ asset.get_absolute_url }}">{{ asset.title }}</a></strong></p></td>
      <td class="text-center">
        {% if asset.type == "3D Region" %}
          <p class="badge badge-pill badge-primary">{{ asset.type }}</p>
        {% elif asset.type == "3D Village" %}
          <p class="badge badge-pill badge-secondary">{{ asset.type }}</p>
        {% else %}
          <p class="badge badge-pill badge-success">{{ asset.type }}</p>
        {% endif %}
      </td>
      <td class="text-right"><p>{{ asset.publishing_date }}</p></td>
      <td class="text-center">
        {% if asset.membership == "One Month" %}
          <p class="badge badge-pill badge-warning">{{ asset.membership }}</p>
        {% else %}
          <p class="badge badge-pill badge-danger">{{ asset.membership }}</p>
        {% endif %}
      </td>
      <td class="text-right"><p>{{ asset.delta }}</p></td>
    </tr>
    {% endif %}
  {% endfor %}

在 Django 管理面板中，我可以正确地看到我想要的所有内容，如下图所示，但模板给了我一个空表。如果我删除返回 delta 一切正常的 else 条件，那么问题就在这里，但我不知道如果我使用完整代码，为什么在 Django 管理面板中一切正常。

在此处输入图像描述

标签： pythondjangodjango-modelsdjango-templates

解决方案

It returns an empty table because your property is_expired always return a non-false value. Your asset.is_expired check should check if asset.is_expired == 'Scaduto'.

However, I recommend you to have this logic inside your model:

@property
def expiration_date(self):
    if self.membership == "One Month":
        return self.publishing_date + datetime.timedelta(days=30)
    else:
        return self.publishing_date + datetime.timedelta(days=365)

@property
def is_expired(self):
    return self.expiration_date < datetime.datetime.now()

@property
def delta(self):
    return self.expiration_date - datetime.datetime.now() if not self.is_expired else 'Scaduto'

Then, you can use it as you want in the template. If what you want is to have it as you have in the admin panel:

  {% for asset in user_details.authorized_user_set.all %}
    <tr>
      <td class="text-left"><p><strong><a class="text-info" href="{{ asset.get_absolute_url }}">{{ asset.title }}</a></strong></p></td>
      <td class="text-center">
        {% if asset.type == "3D Region" %}
          <p class="badge badge-pill badge-primary">{{ asset.type }}</p>
        {% elif asset.type == "3D Village" %}
          <p class="badge badge-pill badge-secondary">{{ asset.type }}</p>
        {% else %}
          <p class="badge badge-pill badge-success">{{ asset.type }}</p>
        {% endif %}
      </td>
      <td class="text-right"><p>{{ asset.publishing_date }}</p></td>
      <td class="text-center">
        {% if asset.membership == "One Month" %}
          <p class="badge badge-pill badge-warning">{{ asset.membership }}</p>
        {% else %}
          <p class="badge badge-pill badge-danger">{{ asset.membership }}</p>
        {% endif %}
      </td>
      <td class="text-right"><p>{{ asset.delta }}</p></td>
    </tr>
  {% endfor %}

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