Python 使用带有两个查询集的django模板筛选问题-django

我有一个django模板，我想用它来过滤查询集中的对象。我有一个要添加新成员的组。我有一个成员对象列表，用于跟踪创建组时添加的组成员。成员是通过显示用户朋友列表并在其姓名旁边显示复选框而添加的。现在，我想显示一个尚未成为该组成员的朋友列表，然后将他们添加到该组（如果选中）。我在html模板过滤系统中遇到了一个问题，我创建该系统只是为了显示尚未成为成员的好友列表。。。有人能帮我弄清楚吗。我有以下所有代码：

以下是传递的查询：

# grab the group members
members = Member.objects.filter(group = group).all()
# grab all of the friends fo the logged in user
friender = Friend.objects.filter(user = user.username).all()
friended = Friend.objects.filter(friend = user).all()
friends = friender | friended
# the required parameters for this form
parameters = {
     'friends':friends,
     'members':members,
     'group':group,
     'message':message,
}
return render(request, 'groups/add_members.html', parameters)

下面是html模板：

{% extends "general/header.html" %}

{% block content %}
    <h1>Create Group</h1>
    <p>{{ message }}</p>
    <form method="POST">
        {% csrf_token %}
        {% for friend in friends %}
          {% for member in members %}
            {% if member.user.username != friend.friend.username %}
              {% if member.user.username != friend.user %}
                {% if friend.user == user.username %}
                  <p>
                    {{ friend.friend.username }}
                    <input type="checkbox" name="{{friend.friend.username}}" value="{{friend.friend.username}}">
                  </p>
                {% endif %}
                {% if friend.friend == user %}
                  <p>
                    {{ friend.user }}
                    <input type="checkbox" name="{{friend.user}}" value="{{friend.user}}">
                  </p>
                {% endif %}
              {% endif %}
            {% endif %}
          {% endfor %}
        {% endfor %}
        <input type="submit" name="submit" value="submit">
    </form>

{% endblock %}

以下是正在显示的内容：

以下是模型：

# the following are models for accepted friend requests
class Friend(models.Model):
    user = models.CharField(max_length=22, default='current user')
    friend = models.ForeignKey(User, on_delete=models.CASCADE, default=1)
    created = models.DateTimeField(auto_now_add=True)

class UserActivity(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    account = models.CharField(max_length=150, null=True)
    expense = models.ForeignKey(Expense, null=True, on_delete=models.CASCADE)
    request = models.ForeignKey(Request, null=True, on_delete=models.CASCADE)
    description = models.CharField(max_length=200, default='some action')
    reference = models.IntegerField(default = '101', null = True)
    category = models.IntegerField(default=1)
    status = models.SmallIntegerField(default=1)
    # 1 = unseen
    # 2 = seen
    created = models.DateTimeField(auto_now_add=True)
# Member stores all of the different members to each of the created groups
class Member(models.Model):
    user = models.ForeignKey(User, default=1, on_delete=models.CASCADE)
    group = models.ForeignKey(Group, default=1 , on_delete=models.CASCADE)
    status = models.SmallIntegerField(default=1)
    # 1 = member
    # 2 - host
    created = models.DateTimeField(auto_now_add=True)

---

没有模型很难进行调试，但您可以像这样简化代码：

创建成员列表：

members = [member.user.username for member in Member.objects.filter(group = group)]

将HTML模板更改为此。检查

friend

是否不在

members

列表中，如果

True

则显示他：

{% extends "general/header.html" %}
{% block content %}
  <h1>Create Group</h1>
  <p>{{ message }}</p>
  <form method="POST">
    {% csrf_token %}
    {% for friend in friends %}
      {% if friend.friend.username not in members %}
        <p>
          {{ friend.friend.username }}
          <input type="checkbox" name="{{friend.friend.username}}" value="{{ friend.friend.username }}">
        </p>
      {% endif %}
      {% if friend.user not in members %}
        <p>
          {{ friend.user }}
          <input type="checkbox" name="{{friend.user}}" value="{{ friend.user }}">
        </p>
      {% endif %}
    {% endfor %}
    <input type="submit" name="submit" value="submit">
  </form>
{% endblock %}

{%extends“general/header.html”%}
{%block content%}
创建组
{{message}}

{%csrf_令牌%}
{%为好友中的好友%}
{%如果friend.friend.username不在成员%}

{{friend.friend.username}

{%endif%}
{%if friend.user不在成员%}

{{friend.user}

{%endif%}
{%endfor%}
{%endblock%}

这将仅显示当前不是组成员的用户

其他备注：

• 过滤后无需使用

  .all（）

  。你已经在过滤了，根据定义，这并不是全部
• 尽可能避免嵌套循环和嵌套ifs。有时你无法避免它们

  ---

请添加您的模型。我试图避免嵌套，但昨天我找不到解决方案。我会试试你的解决方案，看看是否有效。看来它会奏效的。

{% extends "general/header.html" %}
{% block content %}
  <h1>Create Group</h1>
  <p>{{ message }}</p>
  <form method="POST">
    {% csrf_token %}
    {% for friend in friends %}
      {% if friend.friend.username not in members %}
        <p>
          {{ friend.friend.username }}
          <input type="checkbox" name="{{friend.friend.username}}" value="{{ friend.friend.username }}">
        </p>
      {% endif %}
      {% if friend.user not in members %}
        <p>
          {{ friend.user }}
          <input type="checkbox" name="{{friend.user}}" value="{{ friend.user }}">
        </p>
      {% endif %}
    {% endfor %}
    <input type="submit" name="submit" value="submit">
  </form>
{% endblock %}