Question

我有一个django模板，我想用它来过滤查询集中的对象。我有一个组，我想添加新成员。我有一个成员对象列表，用于跟踪创建组时添加的组成员。通过显示用户朋友列表添加成员，其名称旁边有一个复选框。我现在想要显示一个尚未成为该组成员的朋友列表，然后将它们添加到该组中（如果已选中）。我遇到的问题是我创建的html模板过滤系统只显示了尚未成员的朋友列表...任何人都可以帮我解决这个问题。我有以下所有代码：

这是传递的查询：

# 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)

现在这里是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 %}

以下是现在存在的朋友和成员列表

logged in user omar
friends: hani, assad, rana, amer 
members: hani, assad

这是显示的内容：

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)

Answer 1

没有模型很难调试，但你可以像这样简化你的代码：

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。您检查friend列表中是否有members以及True是否显示了他：

{% 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 %}

这将仅显示当前不是该组成员的用户。

其他评论：

过滤后无需使用.all()。您已经过滤了，根据定义，并非所有过滤。
尽可能避免嵌套循环和嵌套ifs。有时你无法避免它们。

使用带有两个查询集的django模板过滤问题 - django

1 个答案: