for循环中的for循环Django模板

Question

我想在模板中设置“发送请求/取消请求”功能。
显示问题，如果请求存在“取消”，如果不存在“发送”。 我不知道如何正确获取请求并将“profile”与“to_profile”进行比较。
现在我在'for'循环中遇到了'for'循环...... \

在模板中，它为一个配置文件显示 3 个按钮（来自此事件的相同数量请求） enter image description here

您能否给我一些如何解决、避免或以其他方式做的提示。
谢谢！

请求模型

class EventInviteRequest(models.Model):
    from_event = models.ForeignKey(Event, on_delete=models.CASCADE,
                                   related_name='from_event', null=True)
    to_profile = models.ForeignKey(Profile, on_delete=models.CASCADE,
                                   related_name='to_profile', null=True)
    timestamp = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"From {self.from_event} to {self.to_profile}"

查看我尝试使用的

def get_list_of_all_users(request, event_id):
    """Get list of all users"""
    event = Event.objects.get(id=event_id)
    profiles = Profile.objects.all()
    requests = EventInviteRequest.objects.filter(from_event=event)

    context = {'profiles': profiles, 'event': event, 'requests': requests}
    return render(request, 'events/invite_all_profiles_to_event.html', context)

模板

{% extends 'base.html' %}
{% load static %}

{% block title %}All profiles{% endblock %}

{% block content %}
    
    <h3>All profiles:</h3>

    {% for profile in profiles %}
    <div style="display: inline-block; margin-right: 10px; text-align: center;">
        <a href="{% url 'account:profile' profile.id %}">
            {% if profile.photo %}
                <img src="{{ profile.photo.url }}" width="70" height="100">
            {% else %}
                <img src="{% static 'images/no_img/no_img.png' %}" width="70" height="100">
            {% endif %} 
            <h4>{{ profile.user }}</h4>
        </a>
        {% if request.user == profile.user %}
            <p>You</p>
        {% else %}
            {% if profile in request.user.profile.friends.all %}
                <p>Friends</p>
            {% else %}
                {% if profile == request.user.profile %}
                {% else %}
                    <a href="{% url 'account:send' profile.id %}">Add to friends</a>
                {% endif %}
            {% endif %}
            <br>
        {% endif %}
        {% if request.user.profile == profile %}
        {% else %}
        <br>
            The problem here
            {% for req in requests %}
                {% if req.to_profile == profile %}
                    <a href="{% url 'events:cancel_event_invite' event.id profile.id %}">Cancel</a>
                    <br>
                {% else %}
                    <a href="{% url 'events:invite_user_to_event' event.id profile.id %}">Invite to event</a>
                    <br>
                {% endif %}
            {% endfor %}
        {% endif %}
    </div>
    {% empty %}
        <p>No profiles yet</p>
    {% endfor %}
    
{% endblock %}

更新
我找到了解决方案，我不确定它有多好，但 atm 对我来说是有效的。

{% for req in profile.to_profile.all %}
        {% if profile == req.to_profile %}
            <a href="{% url 'events:cancel_event_invite' event.id profile.id %}">Cancel</a>
        {% else %}
            <a href="{% url 'events:invite_profile_redirect' event.id profile.id %}">Invite to event</a>
        {% endif %}
{% empty %}
    <a href="{% url 'events:invite_profile_redirect' event.id profile.id %}">Invite to event</a>
{% endfor %}

Answer 1

尝试做这样的事情。 模型.py

class EventInviteRequest(models.Model):
    from_event = models.ForeignKey(Event, on_delete=models.CASCADE,
                                   related_name='from_event', blank=True,null=True)
    to_profile = models.ManyToManyField(Profile, on_delete=models.CASCADE,
                                   related_name='to_profile', blank=True,null=True)
    timestamp = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"From {self.from_event}"

1. 运行python manage.py makemigrations
   
2. 运行python manage.py migrate

views.py

def get_list_of_all_users(request, event_id):
    """Get list of all users"""
    event = Event.objects.get(id=event_id)
    profiles = Profile.objects.all()
    requests = EventInviteRequest.objects.filter(from_event=event)

    context = {'profiles': profiles, 'event': event, 'requests': requests}
    return render(request, 'events/invite_all_profiles_to_event.html', context)

在您遇到问题的模板中

{% for req in requests %}
                {% if profile in req.to_profile.all %}
                    <a href="{% url 'events:cancel_event_invite' event.id profile.id %}">Cancel</a>
                    <br>
                {% else %}
                    <a href="{% url 'events:invite_user_to_event' event.id profile.id %}">Invite to event</a>
                    <br>
                {% endif %}
            {% endfor %}