delete book from DB is done

Author: anijitsao

src/dbRelated/booksDbOps.js

@@ -41,4 +41,21 @@ const addBookToDB = async (bookToAdd) => {
   }
 };
 
-export { findBooksFromDB, addBookToDB };
+const deleteBookFromDB = async (bookToDelete) => {
+  // create the connection
+  const client = createConnectionToDB();
+  try {
+    // select the DB and collection
+    const db = selectDB(client, DB_NAME);
+    const bookDeleted = await db
+      .collection(COLLECTION_BOOKS)
+      .deleteOne({ _id: convertToObjectId(bookToDelete._id) });
+    return bookDeleted.deletedCount;
+  } catch (error) {
+    return error.toString();
+  } finally {
+    await closeConnectionToDB(client);
+  }
+};
+
+export { findBooksFromDB, addBookToDB, deleteBookFromDB };

src/resolvers/bookResolver.js

@@ -1,5 +1,9 @@
 // local dependencies
-import { findBooksFromDB, addBookToDB } from "../dbRelated/booksDbOps.js";
+import {
+  findBooksFromDB,
+  addBookToDB,
+  deleteBookFromDB,
+} from "../dbRelated/booksDbOps.js";
 
 const resolvers = {
   Query: {
@@ -12,7 +16,9 @@ const resolvers = {
     addBook: (_, args) => {
       return addBookToDB(args);
     },
+    deleteBook: (_, args) => {
+      return deleteBookFromDB(args);
+    },
   },
 };
-// console.log("fromm console", resolvers.Query.getAllBooks());
 export { resolvers };

src/typedefs/bookTypedef.js

@@ -15,6 +15,7 @@ const booksTypeDefs = gql`
   # All the Mutations on Book listed here
   type Mutation {
     addBook(name: String!): Book!
+    deleteBook(_id: ID!): Int!
   }
 `;