From 890f26266917baa82ae9b2582b1bba9a9c139383 Mon Sep 17 00:00:00 2001
From: jdlugosz963 <jdlugosz963@gmail.com>
Date: Sun, 28 Nov 2021 22:57:10 +0100
Subject: Add groups list and detail view

---
 chat_api/models.py      |  2 +-
 chat_api/serializers.py |  9 ++++++++
 chat_api/urls.py        |  5 +++--
 chat_api/views.py       | 55 +++++++++++++++++++++++++++++++++++++++++++++++--
 4 files changed, 66 insertions(+), 5 deletions(-)

diff --git a/chat_api/models.py b/chat_api/models.py
index 5076d0b..54fb0f3 100644
--- a/chat_api/models.py
+++ b/chat_api/models.py
@@ -12,7 +12,7 @@ class DmMessage(models.Model):
         return str(self.sender)
 
 class Group(models.Model):
-    name = models.CharField(max_length=16, null=False)
+    name = models.CharField(max_length=16, null=False, unique=True)
     owner = models.ForeignKey(User, related_name="owner_group", on_delete=models.CASCADE)
     users = models.ManyToManyField(User, related_name="users_group")
     create_date = models.DateTimeField(auto_now=True)
diff --git a/chat_api/serializers.py b/chat_api/serializers.py
index 50d84e0..585bb36 100644
--- a/chat_api/serializers.py
+++ b/chat_api/serializers.py
@@ -3,6 +3,15 @@ from rest_framework import serializers
 from .models import *
 
 class GroupSerializer(serializers.ModelSerializer):
+    is_mine = serializers.SerializerMethodField('_is_mine')
+
+    def _is_mine(self, obj):
+        request = self.context.get('request')
+        if request:
+            return request.user == obj.owner
+        return False
+
     class Meta:
         model = Group
         fields = '__all__'
+        extra_fields = ('is_mine', )
diff --git a/chat_api/urls.py b/chat_api/urls.py
index 9fa6016..617a0f2 100644
--- a/chat_api/urls.py
+++ b/chat_api/urls.py
@@ -1,6 +1,7 @@
 from django.urls import path
-from .views import GroupView
+from .views import *
 
 urlpatterns = [
-    path('groups/', GroupView.as_view(), '')    
+    path('groups/', GroupView.as_view(), 'groups_list'),
+    path('groups/detail/<int:pk>/', GroupDetailView.as_view(), 'groups_detail'),
 ]
diff --git a/chat_api/views.py b/chat_api/views.py
index f94f3a0..eca6d45 100644
--- a/chat_api/views.py
+++ b/chat_api/views.py
@@ -5,6 +5,8 @@ from rest_framework.serializers import Serializer
 from rest_framework.views import APIView
 from rest_framework import permissions
 from rest_framework import generics
+from rest_framework.views import Http404
+from rest_framework.generics import get_object_or_404
 from knox.auth import TokenAuthentication
 
 from django.db.models.query import Q
@@ -12,6 +14,17 @@ from django.db.models.query import Q
 from .models import *
 from .serializers import *
 
+
+def set_users(request):
+    users_list = request.data.get('users', [])
+    user_pk = request.user.pk
+
+    if isinstance(users_list, list):
+        if user_pk not in users_list:
+            users_list.append(user_pk)
+
+    request.data['users'] = users_list
+
 class GroupView(generics.ListCreateAPIView):
     permission_classes = (permissions.IsAuthenticated, )
     authentication_classes = (TokenAuthentication, )
@@ -20,9 +33,47 @@ class GroupView(generics.ListCreateAPIView):
     def get_queryset(self):
         return Group.objects.filter(
                     Q(owner=self.request.user) |
-                    Q(users__in=(self.request.user, ))
+                    Q(users__in=(self.request.user.pk, ))
                 ).distinct()
+    
+    def get_serializer_context(self):
+        context = super(GroupView, self).get_serializer_context()
+        context.update({"request": self.request})
+        return context
 
     def create(self, request, *args, **kwargs):
         request.data['owner'] = request.user.pk
-        return super().create(request, *args, **kwargs)
\ No newline at end of file
+        set_users(request)
+        return super().create(request, *args, **kwargs)
+
+class GroupDetailView(generics.RetrieveUpdateDestroyAPIView):
+    permission_classes = (permissions.IsAuthenticated, )
+    authentication_classes = (TokenAuthentication, )
+    serializer_class = GroupSerializer
+
+    def get_queryset(self):
+        return Group.objects.filter(
+                    Q(owner=self.request.user)
+                ).distinct()
+
+    def get_serializer_context(self):
+        context = super(GroupDetailView, self).get_serializer_context()
+        context.update({"request": self.request})
+        return context
+
+    def update(self, request, *args, **kwargs):
+        request.data['owner'] = request.user.pk
+        set_users(request)
+        return super().update(request, *args, **kwargs)
+
+    def retrieve(self, request, pk):
+        try:
+            group = Group.objects.filter(
+                Q(owner=request.user) |
+                Q(users__in=(request.user.pk, ))
+            ).distinct().get(Q(pk=pk))
+        except Group.DoesNotExist:
+            raise Http404
+
+        serializer = GroupSerializer(group, context={"request": self.request})
+        return Response(serializer.data)
-- 
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