Added some logic

README.md

@@ -1,4 +1,3 @@
 
 
-shelf items
-shelves/id/books
+shelves/id/items !!!!

backend/apps/authors/models.py

@@ -1,6 +1,6 @@
-# from django.db import models
-# from apps.user.models import User
+from django.db import models
+from apps.user.models import User
 
-# class Author(models.Model):
-#     user = models.ForeignKey(User, on_delete=models.CASCADE, related_name="Authors")
-#     name = models.CharField(max_length=255)
+class Author(models.Model):
+    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name="authors")
+    name = models.CharField(max_length=255)

backend/apps/authors/serializers.py

@@ -0,0 +1,16 @@
+from rest_framework import serializers
+
+from apps.authors.models import Author
+
+class AuthorSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Author
+        fields = ["id", "name"]
+        read_only_fields = ["id"]
+
+    def create(self, validated_data):
+        request = self.context["request"]
+        validated_data["user"] = request.user
+
+        return super().create(validated_data)
+        

backend/apps/authors/urls.py

@@ -1,9 +1,9 @@
 from rest_framework.routers import DefaultRouter
 
-# from apps.authors.views import AuthorsViewSet
+from apps.authors.views import AuthorsViewSet
 
 urlpatterns = []
 
-# router = DefaultRouter()
-# router.register("", viewset=AuthorsViewSet)
-# urlpatterns += router.urls
+router = DefaultRouter()
+router.register("", viewset=AuthorsViewSet)
+urlpatterns += router.urls

backend/apps/authors/views.py

@@ -1,20 +1,20 @@
-# from rest_framework import viewsets
+from rest_framework import viewsets
 
-# from apps.authors.models import Author
-# from apps.authors.serializers import AuthorSerializer
-# from rest_framework import viewsets 
-# from rest_framework.permissions import IsAuthenticated
-# from rest_framework_simplejwt.authentication import JWTAuthentication
+from apps.authors.models import Author
+from apps.authors.serializers import AuthorSerializer
+from rest_framework import viewsets 
+from rest_framework.permissions import IsAuthenticated
+from rest_framework_simplejwt.authentication import JWTAuthentication
 
-# class AuthorsViewSet(viewsets.ModelViewSet):
-#     queryset = Author.objects.select_related("shelf")
-#     serializer_class = AuthorSerializer
+class AuthorsViewSet(viewsets.ModelViewSet):
+    queryset = Author.objects.all()
+    serializer_class = AuthorSerializer
 
-#     authentication_classes = [JWTAuthentication]
-#     permission_classes = [IsAuthenticated]
+    authentication_classes = [JWTAuthentication]
+    permission_classes = [IsAuthenticated]
 
-#     def get_queryset(self):
-#         return self.queryset.filter(
-#             shelf__user_id=self.request.user.pk
-#         )
+    def get_queryset(self):
+        return self.queryset.filter(
+            user_id=self.request.user.pk
+        )
 

backend/apps/books/models.py

@@ -1,11 +1,11 @@
 from django.db import models
 
 from apps.shelves.models import Shelf
-# from apps.authors.models import Author
+from apps.authors.models import Author
 from apps.user.models import User
 
 class Book(models.Model):
-    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name="Authors")
-    # authors = models.ManyToManyField(Author, related_name="books")
+    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name="books")
+    authors = models.ManyToManyField(Author, related_name="books")
     name = models.CharField(max_length=255)
     isbn = models.CharField(max_length=13)

backend/apps/books/serializers.py

@@ -1,17 +1,27 @@
 from rest_framework import serializers
 
-from apps.books.models import Book
 from apps.shelves.serializers import ShelfSerializer
+from apps.authors.serializers import AuthorSerializer
+from apps.books.models import Book
 from apps.shelves.models import Shelf
+from apps.authors.models import Author
 
 class BookSerializer(serializers.ModelSerializer):
-    #shelf = ShelfSerializer(read_only=True)
-    #shelf_id = serializers.PrimaryKeyRelatedField(
-        #queryset=Shelf.objects.all(),
-        #source="shelf", 
-        #write_only=True
-    #)
+    shelf = ShelfSerializer(read_only=True)
+    shelf_id = serializers.PrimaryKeyRelatedField(
+        queryset=Shelf.objects.all(),
+        source="shelf", 
+        write_only=True
+    )
     
+    authors = AuthorSerializer(many=True, read_only=True)
+    authors_id = serializers.PrimaryKeyRelatedField(
+        queryset=Author.objects.all(),
+        source="authors",
+        many=True,
+        allow_null=True,
+        write_only=True
+    )
     
     class Meta: 
         model = Book
@@ -19,7 +29,30 @@ class BookSerializer(serializers.ModelSerializer):
             "id",
             "name",
             "isbn", 
-            #"shelf",
-            #"shelf_id"
+            "shelf",
+            "shelf_id",
+            "authors",
+            "authors_id"
         ]
-        read_only_fields = ["id"]
+        read_only_fields = ["id"]
+    
+
+    def __init__(self, instance=None, data=..., **kwargs):
+        super().__init__(instance, data, **kwargs)
+
+        request = self.context.get("request")        
+        if request and request.user:
+            self.fields["shelf_id"].queryset = Shelf.objects.filter(
+                user=request.user
+            )
+
+            self.fields["authors_id"].queryset = Author.objects.filter(
+                user=request.user
+            )
+
+            
+    def create(self, validated_data):
+        request = self.context["request"]
+        validated_data["user"] = request.user
+
+        return super().create(validated_data)

backend/apps/books/views.py

@@ -16,4 +16,4 @@ class BooksViewSet(viewsets.ModelViewSet):
     def get_queryset(self):
         return self.queryset.filter(
             shelf__user_id=self.request.user.pk
-        )
+        ).prefetch_related("authors")

backend/apps/shelf_items/apps.py

@@ -2,4 +2,4 @@ from django.apps import AppConfig
 
 
 class ShelfItemsConfig(AppConfig):
-    name = 'shelf_items'
+    name = 'apps.shelf_items'

backend/apps/shelf_items/models.py

@@ -1,3 +1,19 @@
+from django.db.models import Q, F
 from django.db import models
 
-# Create your models here.
+from apps.books.models import Book
+from apps.shelves.models import Shelf
+
+class ShelfItem(models.Model):
+    book = models.ForeignKey(Book, on_delete=models.CASCADE, related_name="shelf_items")
+    shelf = models.ForeignKey(Shelf, on_delete=models.CASCADE, related_name="book_items")
+
+    quantity = models.PositiveIntegerField(default=0)
+
+    class Meta:
+        constraints = [
+            models.UniqueConstraint(
+                fields=["book", "shelf"],
+                name="unique_book_per_shelf"
+            ),
+        ]

backend/apps/shelf_items/serializers.py

@@ -0,0 +1,77 @@
+from rest_framework import serializers
+
+from apps.shelf_items.models import ShelfItem
+from apps.books.models import Book
+from apps.shelves.models import Shelf
+from apps.shelves.serializers import ShelfSerializer
+from apps.books.serializers import BookSerializer
+
+class ShelfItemSerializer(serializers.ModelSerializer):
+    shelf = ShelfSerializer(read_only=True)
+    shelf_id = serializers.PrimaryKeyRelatedField(
+        queryset=Shelf.objects.all(),
+        source="shelf", 
+        write_only=True
+    )
+
+    book = BookSerializer(read_only=True)
+    book_id = serializers.PrimaryKeyRelatedField(
+        queryset=Book.objects.all(),
+        source="book", 
+        write_only=True
+    )
+
+    class Meta:
+        model = ShelfItem
+        fields = [
+            "id",
+            "shelf",
+            "shelf_id",
+            "book",
+            "book_id",
+            "quantity"
+        ]
+        read_only_fields = ["id"]
+
+    def __init__(self, instance=None, data=..., **kwargs):
+        super().__init__(instance, data, **kwargs)
+
+        request = self.context.get("request")        
+        if request and request.user:
+            self.fields["shelf_id"].queryset = Shelf.objects.filter(
+                user=request.user
+            )
+
+            self.fields["book_id"].queryset = Book.objects.filter(
+                user=request.user
+            )
+
+    def validate(self, attrs):
+        attrs = super().validate(attrs)
+
+        book = attrs.get("book")
+        shelf = attrs.get("shelf")
+
+        if book and shelf:
+            qs = ShelfItem.objects.filter(
+                book=book,
+                shelf=shelf
+            )
+            
+            if self.instance:
+                qs = qs.exclude(pk=self.instance.pk)
+
+            if qs.exists():
+                raise serializers.ValidationError(
+                    "This Book already exists in shelf!"
+                )
+                
+            if book.user_id != shelf.user_id:
+                raise serializers.ValidationError(
+                    "Book and Shelf must be from the same user!"
+                )
+        
+        return attrs
+
+
+    

backend/apps/shelf_items/urls.py

@@ -0,0 +1,9 @@
+from rest_framework.routers import DefaultRouter
+
+from apps.shelf_items.views import ShelfItemsViewSet
+
+urlpatterns = []
+
+router = DefaultRouter()
+router.register("", viewset=ShelfItemsViewSet)
+urlpatterns += router.urls

backend/apps/shelf_items/views.py

@@ -1,3 +1,20 @@
-from django.shortcuts import render
+from rest_framework import viewsets
 
-# Create your views here.
+from apps.shelf_items.models import ShelfItem
+from apps.shelf_items.serializers import ShelfItemSerializer
+from rest_framework import viewsets 
+from rest_framework.permissions import IsAuthenticated
+from rest_framework_simplejwt.authentication import JWTAuthentication
+
+
+class ShelfItemsViewSet(viewsets.ModelViewSet):
+    queryset = ShelfItem.objects.all()
+    serializer_class =  ShelfItemSerializer 
+
+    authentication_classes = [JWTAuthentication]
+    permission_classes = [IsAuthenticated]
+
+    def get_queryset(self):
+        return ShelfItem.objects.filter(
+            shelf__user_id=self.request.user.pk,
+        ).select_related("book", "shelf").prefetch_related("book__authors")