using curly double brackets inside another curly double brackets in django template - sql

Question

I started studying Django few days back, while doing a project I came across a situation.
In the views.py, I'm passing
def chat_rooms(request):
context = dict()
context['title'] = 'Chat'
rooms = Chat_rooms.objects.filter(Q(user1 = request.user.id) | Q(user2 = request.user.id) )
context['rooms'] = rooms
for room in rooms:
rmssg = Chats.objects.filter(room_id = room.id)
lmssg = Chats.objects.latest('id')
context[str(room.id)] = lmssg
return render(request,'previlageGroup/chat_rooms.html',context)
In the Django template,chat_room.html
{% for room in rooms %}
<div class="card" style="width: 100%;">
<a href="{% url 'pgroup:chat.screen' room.id %}">
<div class="card-body">
<p class="card-text">
{{ {{room.id}}.message}}
</p>
</div>
</a>
</div>
{% endfor %}
In models.py
class Chat_rooms(models.Model):
user1 = models.ForeignKey(User, on_delete=models.CASCADE, related_name='user1')
user2 = models.ForeignKey(User, on_delete=models.CASCADE, related_name='user2')
created_on = models.DateTimeField(auto_now_add=True)
class Chats(models.Model):
date = models.DateTimeField(auto_now_add=True)
has_viewed = models.BooleanField(default= False)
message = models.CharField(max_length = 200)
sender = models.ForeignKey(User, on_delete=models.CASCADE, related_name='sender')
receiver = models.ForeignKey(User, on_delete=models.CASCADE, related_name='receiver')
room = models.ForeignKey(Chat_rooms, on_delete=models.CASCADE)
Django is giving me a error, that {{ {{room.id}}.message }} is not possible.
How can I do this? Is there any other way? Thanks in advance

Answer 1

At the end of the day, a django Model object is just like any other object in python, so you could easily do:
for room in rooms:
rmssg = Chats.objects.filter(room_id = room.id)
lmssg = Chats.objects.latest('id')
room.last_msg = lmssg
And access {{ room.last_msg }} in your template. This might cause errors if you ever happen to implement a last_msg field though.
Perhaps a more elegant solution would be implementing a related_name to your room field. If you change the last line of your views.py to:
room = models.ForeignKey(Chat_rooms, on_delete=models.CASCADE, related_name="chats")
You would be able to do things like:
room.chats.all() #get all messages from a chatroom
And, in your templates, you could do:
{{ room.chats.last }}
To get the last message in the chat.