Completed all tasks

api/admin.py

@@ -1,4 +1,5 @@
 from django.contrib import admin
-from .models import Todo
+from .models import Todo, collaboratorOfTodo
 
-admin.site.register(Todo)
+admin.site.register(Todo)
+admin.site.register(collaboratorOfTodo)

api/migrations/0003_collaboratoroftodo.py

@@ -0,0 +1,24 @@
+# Generated by Django 3.0.7 on 2021-08-07 08:22
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('api', '0002_todo_creator'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='collaboratorOfTodo',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('collaborator', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL)),
+                ('todo', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='api.Todo')),
+            ],
+        ),
+    ]

api/migrations/0004_collaboratoroftodo_collaborator_username.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.0.7 on 2021-08-07 10:22
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0003_collaboratoroftodo'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='collaboratoroftodo',
+            name='collaborator_username',
+            field=models.CharField(default='', max_length=500),
+        ),
+    ]

api/models.py

@@ -7,4 +7,13 @@ class Todo(models.Model):
     title = models.CharField(max_length=255)
 
     def __str__(self):
-        return self.title
+        return self.title
+
+
+class collaboratorOfTodo(models.Model):
+    todo = models.ForeignKey(Todo, on_delete=models.CASCADE)
+    collaborator = models.ForeignKey(User, on_delete=models.CASCADE)
+    collaborator_username = models.CharField(max_length=500, default = "")
+
+    def __str__(self):
+        return self.todo.title 

api/serializers.py

@@ -1,12 +1,17 @@
 from rest_framework import serializers
-from .models import Todo
+from .models import Todo, collaboratorOfTodo
+from django.contrib.auth.models import User
 
 
 """
 TODO:
 Create the appropriate Serializer class(es) for implementing
 Todo GET (List and Detail), PUT, PATCH and DELETE.
 """
+class TodoItemSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Todo
+        fields = ('id', 'title',)
 
 
 class TodoCreateSerializer(serializers.ModelSerializer):
@@ -23,7 +28,34 @@ def save(self, **kwargs):
         user = self.context['request'].user
         title = data['title']
         todo = Todo.objects.create(creator=user, title=title)
-
+        return todo
+
     class Meta:
         model = Todo
         fields = ('id', 'title',)
+
+
+
+class TodoCollaboratorSerializer(serializers.ModelSerializer):
+
+    def create(self, **kwargs):
+        data = self.validated_data
+        task = self.context["todo"]
+        if (collaboratorOfTodo.objects.filter(todo = task, collaborator_username = data['collaborator_username']).exists()):
+            return None
+
+        else:    
+            todoCollaborator = collaboratorOfTodo.objects.create(todo = task, collaborator_username = data['collaborator_username'], collaborator = User.objects.get(username = data['collaborator_username']))
+            return todoCollaborator
+
+    class Meta:
+        model = collaboratorOfTodo
+        fields = ('id', 'collaborator_username',)
+
+
+class UserAsCollaboraterSerializer(serializers.ModelSerializer):
+
+    class Meta:
+        model = collaboratorOfTodo
+        fields = ('todo',)
+

api/urls.py

@@ -1,5 +1,5 @@
 from django.urls import path
-from .views import TodoCreateView
+from .views import TodoCreateView,TodoGetAllView,TodoByIdView,TodoCollaboratorView, RemoveAllCollaboratorView,removeACollaboratorView, userAsCollaboratorView
 
 """
 TODO:
@@ -9,4 +9,10 @@
 
 urlpatterns = [
     path('todo/create/', TodoCreateView.as_view()),
+    path('todo/<int:id>', TodoByIdView.as_view()),
+    path('todo/', TodoGetAllView.as_view()),
+    path('todo/<int:id>/collaborators', TodoCollaboratorView.as_view()),
+    path('todo/user_as_collaborator', userAsCollaboratorView.as_view()),
+    path('todo/<int:id>/remove_all_collaborators', RemoveAllCollaboratorView.as_view()),
+    path('todo/remove_a_collaborator_by_its_id/<int:id>', removeACollaboratorView.as_view()),
 ]

api/views.py

@@ -2,8 +2,9 @@
 from rest_framework import permissions
 from rest_framework import status
 from rest_framework.response import Response
-from .serializers import TodoCreateSerializer
-from .models import Todo
+from .serializers import TodoCreateSerializer, TodoItemSerializer, TodoCollaboratorSerializer, UserAsCollaboraterSerializer
+from .models import Todo, collaboratorOfTodo
+from django.http import HttpResponse
 
 
 """
@@ -12,6 +13,105 @@
 Todo GET (List and Detail), PUT, PATCH and DELETE.
 """
 
+class TodoByIdView(generics.GenericAPIView):
+    permission_classes = (permissions.IsAuthenticated, )
+    serializer_class = TodoItemSerializer
+
+    def get_object(self,user, id):
+        try:
+            # t = Todo.objects.get(id = id)
+            # if t is None:
+            #     return Response({"Todo with the given id does not exist."},status = status.HTTP_404_NOT_FOUND)
+            return Todo.objects.get(id = id, creator =user)
+        except:
+            return None 
+
+    def get(self, request, id = None):
+        todo = self.get_object(request.user, id)
+        if todo is None:
+             t = Todo.objects.get(id = id)
+             if collaboratorOfTodo.objects.filter(todo = t, collaborator = request.user).exists():
+                todo = t
+             else:
+                return Response({"You do not have permission to view this todo."},status = status.HTTP_400_BAD_REQUEST) 
+        if todo is not None:        
+            serializer = self.get_serializer(todo)
+            return Response(serializer.data, status = status.HTTP_200_OK)
+
+
+
+    def put(self, request, id):
+        todo = self.get_object(request.user, id)
+        if todo is None:
+             t = Todo.objects.get(id = id)
+             if collaboratorOfTodo.objects.filter(todo = t, collaborator = request.user).exists():
+                todo = t
+             else:
+                return Response({"You do not have permission to update this todo."},status = status.HTTP_400_BAD_REQUEST)    
+        if todo is not None:    
+            serializer = self.get_serializer(todo, data = request.data)
+            serializer.is_valid(raise_exception=True)
+            serializer.save()
+            return Response(serializer.data)
+
+
+
+    def patch(self, request, id = None):
+        todo = self.get_object(request.user, id)
+        if todo is None:
+            t = Todo.objects.get(id = id)
+            if collaboratorOfTodo.objects.filter(todo = t, collaborator = request.user).exists():
+                todo = t
+            else:
+                return Response({"You do not have permission to update this todo."},status = status.HTTP_400_BAD_REQUEST)     
+        if todo is not None: 
+            serializer = self.get_serializer(todo, data = request.data, partial =True)
+            serializer.is_valid(raise_exception=True)
+            serializer.save()
+            return Response(serializer.data)
+
+
+
+    def delete(self, request, id = None):
+        todo = self.get_object(request.user, id)
+        if todo is None:
+            t = Todo.objects.get(id = id)
+            if collaboratorOfTodo.objects.filter(todo = t, collaborator = request.user).exists():
+                todo = t
+            else:
+                return Response({"You do not have permission to delete this todo."},status = status.HTTP_400_BAD_REQUEST)     
+        if todo is not None: 
+            todo.delete()
+            return Response(status = status.HTTP_204_NO_CONTENT)
+
+
+
+class TodoGetAllView(generics.GenericAPIView):
+    permission_classes = (permissions.IsAuthenticated, )
+    serializer_class = TodoItemSerializer
+
+
+    def get(self,request):
+        allTodos = Todo.objects.filter(creator = request.user)
+        todosDueToCollaboration = collaboratorOfTodo.objects.filter(collaborator = request.user)
+        serializer_collaborator = UserAsCollaboraterSerializer(todosDueToCollaboration , many =True)
+        serializer = self.get_serializer(allTodos, many =True)
+
+        responseBody = []
+
+        for x in serializer.data:
+            responseBody.append(x)
+
+        for x in serializer_collaborator.data:
+            todo = Todo.objects.get(id = x['todo'])
+            creatorOfTodo = todo.creator
+            responseBody.append({'id' : todo.id , 'title' : todo.title , 'Todo_creator' : creatorOfTodo.username})
+
+        return Response(responseBody, status = status.HTTP_200_OK)
+
+
+
+
 
 class TodoCreateView(generics.GenericAPIView):
     """
@@ -31,5 +131,102 @@ def post(self, request):
         """
         serializer = self.get_serializer(data=request.data)
         serializer.is_valid(raise_exception=True)
-        serializer.save()
-        return Response(status=status.HTTP_200_OK)
+        data = serializer.save()
+        responseBody = {
+            'id' : data.id,
+            'title' : data.title
+        }
+        return Response(responseBody, status=status.HTTP_201_CREATED)
+
+
+
+class TodoCollaboratorView(generics.GenericAPIView):
+    permission_classes = (permissions.IsAuthenticated, )
+    serializer_class = TodoCollaboratorSerializer
+
+    def get_object(self, user,id):
+        try:
+            return Todo.objects.get(id = id, creator =user)
+        except:
+            return None  
+
+    def get(self, request, id):
+        todo = self.get_object(request.user, id)
+        if todo is None:
+            t = Todo.objects.get(id = id)
+            if collaboratorOfTodo.objects.filter(todo = t, collaborator = request.user).exists():
+                todo = t
+            else:
+                return Response({"You do not have permission to view collaborators of this todo."},status = status.HTTP_400_BAD_REQUEST) 
+        if todo is not None:         
+            allCollaboratorsOfTodo = collaboratorOfTodo.objects.filter(todo = todo)
+            serializer = TodoCollaboratorSerializer(allCollaboratorsOfTodo, many =True)
+            return Response(serializer.data, status = status.HTTP_200_OK)          
+
+    def post(self, request, id):
+        todo = self.get_object(request.user,id)
+        if todo is not None:
+            Data = request.data
+            user = request.user
+            if(user.username == Data['collaborator_username']):
+                return Response({"You cannot become the collaborator as you are the creator of this todo"},status = status.HTTP_400_BAD_REQUEST)
+            else:
+                serializer = TodoCollaboratorSerializer(data = request.data, context = {"todo" : todo})
+                serializer.is_valid(raise_exception=True)
+                newCollaborator = serializer.create()
+                if newCollaborator is not None:
+                    return Response(serializer.data)
+                else:
+                    return  Response({"Entered user is already a collaborator of this todo."}, status = status.HTTP_400_BAD_REQUEST)
+        else:
+            return Response({"You do not have permission to add collaborators to this todo"},status = status.HTTP_400_BAD_REQUEST)
+
+
+
+
+class RemoveAllCollaboratorView(generics.GenericAPIView):
+        permission_classes = (permissions.IsAuthenticated, )
+        serializer_class = TodoCollaboratorSerializer
+
+        def delete(self, request, id):
+            todo = Todo.objects.get(id = id)
+            if (todo.creator != request.user):
+                return Response({"You do not have permissions to delete collaborators of this todo."},status = status.HTTP_400_BAD_REQUEST)
+            elif todo is not None:
+                CollaboratorsToBeDeleted = collaboratorOfTodo.objects.filter(todo = todo)
+                for c in CollaboratorsToBeDeleted:
+                    c.delete()
+                return Response({"All Collaborators of this todo deleted successfully"},status = status.HTTP_204_NO_CONTENT)
+
+
+
+
+
+class removeACollaboratorView(generics.GenericAPIView):
+        permission_classes = (permissions.IsAuthenticated, )
+        serializer_class = TodoCollaboratorSerializer  
+
+        def delete(self, request, id):
+            CollaboratorToBeDeleted = collaboratorOfTodo.objects.get(id = id)
+            todo = CollaboratorToBeDeleted.todo
+            if todo.creator == request.user:
+                CollaboratorToBeDeleted.delete()
+                return Response({"Collaborator deleted successfully"},status = status.HTTP_204_NO_CONTENT)
+
+            else:
+                return Response({"You do not have permissions to delete collaborator of this todo."},status = status.HTTP_400_BAD_REQUEST) 
+
+
+class userAsCollaboratorView(generics.GenericAPIView):   
+        permission_classes = (permissions.IsAuthenticated, )
+        serializer_class = UserAsCollaboraterSerializer
+
+        def get(self, request):
+            todos = collaboratorOfTodo.objects.filter(collaborator = request.user)
+            serializer = UserAsCollaboraterSerializer(todos , many =True)
+            responseBody = []
+            for x in serializer.data:
+                todo = Todo.objects.get(id = x['todo'])
+                creatorOfTodo = todo.creator
+                responseBody.append({'Todo_id' : todo.id , 'Todo_title' : todo.title , 'Todo_creator' : creatorOfTodo.username})
+            return Response(responseBody)