डेटा रिज़ॉल्वर लागू करना

import org.springframework.graphql.data.method.annotation.QueryMapping;
import org.springframework.stereotype.Controller;

@Controller
public class GreetingController {

  @QueryMapping
  public String hello() {
    return "Hello from CoddyKit!";
  }
}

import org.springframework.graphql.data.method.annotation.QueryMapping;
import org.springframework.stereotype.Controller;

// A simple data class for our Book
record Book(String id, String title, String author) {}

@Controller
public class BookController {

  @QueryMapping
  public Book firstBook() {
    return new Book("book-1", "The Great Journey", "Alice Wonderland");
  }
}

import org.springframework.graphql.data.method.annotation.QueryMapping;
import org.springframework.stereotype.Controller;
import java.util.List;
import java.util.ArrayList;

record Book(String id, String title, String author) {}

@Controller
public class BookListController {

  private final List<Book> books = new ArrayList<>(List.of(
    new Book("b-1", "The Moonstone", "Wilkie Collins"),
    new Book("b-2", "Pride and Prejudice", "Jane Austen"),
    new Book("b-3", "1984", "George Orwell")
  ));

  @QueryMapping
  public List<Book> allBooks() {
    return books;
  }
}

import org.springframework.graphql.data.method.annotation.Argument;
import org.springframework.graphql.data.method.annotation.QueryMapping;
import org.springframework.stereotype.Controller;
import java.util.List;
import java.util.ArrayList;

record Book(String id, String title, String author) {}

@Controller
public class BookByIdController {

  private final List<Book> books = new ArrayList<>(List.of(
    new Book("b-1", "The Moonstone", "Wilkie Collins"),
    new Book("b-2", "Pride and Prejudice", "Jane Austen")
  ));

  @QueryMapping
  public Book bookById(@Argument String id) {
    return books.stream()
      .filter(book -> book.id().equals(id))
      .findFirst()
      .orElse(null);
  }
}

import org.springframework.graphql.data.method.annotation.SchemaMapping;
import org.springframework.stereotype.Controller;

record Book(String id, String title, String authorId) {}
record Author(String id, String name) {}

@Controller
public class AuthorResolver {

  // This resolver is for the 'author' field on a 'Book' object
  @SchemaMapping
  public Author author(Book book) {
    // In a real app, you'd fetch from a data source using book.authorId()
    if ("auth-1".equals(book.authorId())) {
      return new Author(book.authorId(), "Wilkie Collins");
    }
    return new Author(book.authorId(), "Unknown Author");
  }
}

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.graphql.data.method.annotation.Argument;
import org.springframework.graphql.data.method.annotation.QueryMapping;
import org.springframework.graphql.data.method.annotation.SchemaMapping;
import org.springframework.stereotype.Controller;
import java.util.List;
import java.util.ArrayList;

// Data classes
record Book(String id, String title, String authorId) {}
record Author(String id, String name) {}

@SpringBootApplication
public class GraphQLResolversApp {
  public static void main(String[] args) {
    SpringApplication.run(GraphQLResolversApp.class, args);
  }
}

@Controller
class BookDataController {

  private final List<Book> books = new ArrayList<>(List.of(
    new Book("b-1", "The Moonstone", "auth-1"),
    new Book("b-2", "Pride and Prejudice", "auth-2"),
    new Book("b-3", "1984", "auth-3")
  ));

  @QueryMapping
  public List<Book> allBooks() {
    return books;
  }

  @QueryMapping
  public Book bookById(@Argument String id) {
    return books.stream()
      .filter(book -> book.id().equals(id))
      .findFirst()
      .orElse(null);
  }

  // Field-level resolver for 'author' on 'Book'
  @SchemaMapping
  public Author author(Book book) {
    // Mocking author data lookup
    return switch (book.authorId()) {
      case "auth-1" -> new Author("auth-1", "Wilkie Collins");
      case "auth-2" -> new Author("auth-2", "Jane Austen");
      case "auth-3" -> new Author("auth-3", "George Orwell");
      default -> new Author(book.authorId(), "Unknown Author");
    };
  }
}