Post Request to Django Rest Api that has a filter. So messages/?room=4 - django

Question

My Backend is built like this. Every 'Room' has 'Messages' And Every Message has a Sender (person who sends it).
I want to make a post request to messages/?room=4. So I want to basically add a message directly to the room with id=4.
//models
class UserProfile(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
class Meta:
verbose_name_plural = 'All Users'
def __str__(self):
return self.user.username
#receiver(post_save, sender=User)
def create_user_data(sender, update_fields, created, instance, **kwargs):
if created:
user = instance
profile = UserProfile.objects.create(user=user)
class Message(models.Model):
sender = models.ForeignKey(UserProfile, on_delete=models.CASCADE, related_name="sendermessage")
content = models.CharField(max_length=500)
date = models.DateField(default=date.today)
canview = models.ManyToManyField(UserProfile, blank=True, related_name="messagecanview")
class Meta:
verbose_name_plural = 'Messages'
def __str__(self):
return "{sender}".format(sender=self.sender)
class Room(models.Model):
name = models.CharField(max_length=50)
members = models.ManyToManyField(UserProfile, blank=True, related_name='room')
messages = models.ManyToManyField(Message, blank=True, related_name='room')
class Meta:
verbose_name_plural = 'Rooms'
def __str__(self):
return "{name}".format(name=self.name)
//serializers, views
class UserProfileSerializer(serializers.ModelSerializer):
username = serializers.CharField(source='user.username')
class Meta:
model = UserProfile
fields = ('id', 'username')
class MessageSerializer(serializers.ModelSerializer):
sender_obj = UserProfileSerializer(source='sender', read_only=True)
class Meta:
model = Message
fields = ('id', 'content', 'date', 'sender', 'sender_obj')
class RoomSerializer(serializers.ModelSerializer):
messages = MessageSerializer(many=True, read_only=True)
members = UserProfileSerializer(many=True, read_only=True)
class Meta:
model = Room
fields = ('id', 'name', 'members', 'messages')
class UserProfileView(viewsets.ModelViewSet):
http_method_names = ['get', 'post', 'put', 'delete', 'patch']
queryset = UserProfile.objects.all()
serializer_class = UserProfileSerializer
filter_backends = (
django_filters.rest_framework.DjangoFilterBackend,
rest_framework.filters.OrderingFilter,
)
filter_fields = ['room']
class MessageView(viewsets.ModelViewSet):
http_method_names = ['get', 'post', 'put', 'delete', 'patch']
queryset = Message.objects.all()
serializer_class = MessageSerializer
filter_backends = (
django_filters.rest_framework.DjangoFilterBackend,
rest_framework.filters.OrderingFilter,
)
filter_fields = ['room']
class UserMessageView(MessageView):
def get_queryset(self):
return Message.objects.filter(canview__user=self.request.user)
class RoomView(viewsets.ModelViewSet):
http_method_names = ['get', 'post', 'put', 'delete', 'patch']
queryset = Room.objects.all()
serializer_class = RoomSerializer
class UserRoomView(RoomView):
def get_queryset(self):
return Room.objects.filter(members__user=self.request.user)
API all messages:
[
{
"id": 7,
"content": "hej",
"date": "2019-07-08",
"sender": 1,
"sender_obj": {
"id": 1,
"username": "william"
}
},
{
"id": 8,
"content": "yoyo",
"date": "2019-07-08",
"sender": 2,
"sender_obj": {
"id": 2,
"username": "eric"
}
},
{
"id": 9,
"content": "tjo bror",
"date": "2019-07-08",
"sender": 3,
"sender_obj": {
"id": 3,
"username": "ryan"
}
},
{
"id": 10,
"content": "hej jag heter Eric och jag gar pa polhemskolan i lund och jag ar 17 ar gammal",
"date": "2019-07-08",
"sender": 2,
"sender_obj": {
"id": 2,
"username": "eric"
}
},
{
"id": 11,
"content": "vi vet hahah",
"date": "2019-07-09",
"sender": 1,
"sender_obj": {
"id": 1,
"username": "william"
}
},
{
"id": 12,
"content": "amen sluta",
"date": "2019-07-09",
"sender": 2,
"sender_obj": {
"id": 2,
"username": "eric"
}
},
{
"id": 13,
"content": "hej",
"date": "2019-07-09",
"sender": 1,
"sender_obj": {
"id": 1,
"username": "william"
}
},
{
"id": 14,
"content": "hej william",
"date": "2019-07-09",
"sender": 3,
"sender_obj": {
"id": 3,
"username": "ryan"
}
}
]
API messages/?room=4
[
{
"id": 7,
"content": "hej",
"date": "2019-07-08",
"sender": 1,
"sender_obj": {
"id": 1,
"username": "william"
}
},
{
"id": 13,
"content": "hej",
"date": "2019-07-09",
"sender": 1,
"sender_obj": {
"id": 1,
"username": "william"
}
},
{
"id": 14,
"content": "hej william",
"date": "2019-07-09",
"sender": 3,
"sender_obj": {
"id": 3,
"username": "ryan"
}
}
]
If someone has a solution it would help loads. I need to get this to work because its a chat application I am developing on flutter- mobile.

Answer 1

Change your MessageSerializer to expose the room related_field ( which is a ManyToManyField and thus each message can be associated to multiple rooms...):
class MessageSerializer(serializers.ModelSerializer):
[...]
fields = ('id', 'content', 'date', 'sender', 'sender_obj', 'room')
# ^^^^^^^^
POST to your /message interface like:
{
"content": "foodefafa",
"sender": 17,
"rooms":[42]
}