feat:Added CRUD support for books and authors

Signed-off-by: Hitarth Hindocha <hindochahitarth@gmail.com>

Author: hindochahitarth

spring-boot-postgres-graphql/src/main/java/com/keploy/springbootpostgresgraphql/controller/BookController.java

@@ -115,6 +115,17 @@ public Boolean deleteAuthor(@Argument int id) {
         return true;
     }
 
+    @MutationMapping
+    public Author updateAuthor(@Argument int id, @Argument AuthorInput author) {
+        Author existingAuthor = authorRepository.findAuthorById(id);
+        if (existingAuthor != null) {
+            existingAuthor.setFirstName(author.getFirstName());
+            existingAuthor.setLastName(author.getLastName());
+            return authorRepository.save(existingAuthor);
+        }
+        return null;
+    }
+
     @MutationMapping
     public Category addCategory(@Argument CategoryInput category) {
         Category newCategory = new Category();

spring-boot-postgres-graphql/src/main/resources/graphql/schema.graphqls

@@ -13,6 +13,7 @@ type Mutation {
     updateBook(id: ID!, book: BookInput!): Book
     deleteBook(id: ID!): Boolean
     addAuthor(author: AuthorInput!): Author
+    updateAuthor(id: ID!, author: AuthorInput!): Author
     deleteAuthor(id: ID!): Boolean
     addCategory(category: CategoryInput!): Category
 }