Return users in Get Languages

Author: mickablondo

src/main/java/dev/mikablondo/hibernate_reactive_test/controller/LanguageController.java

@@ -2,14 +2,12 @@
 
 import dev.mikablondo.hibernate_reactive_test.dto.Language;
 import dev.mikablondo.hibernate_reactive_test.services.LanguageService;
+import io.smallrye.mutiny.Multi;
 import io.smallrye.mutiny.Uni;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestBody;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.*;
 
 /**
  * This class is a REST controller for managing Language entities.
@@ -23,6 +21,11 @@ public class LanguageController {
 
     private final LanguageService languageService;
 
+    @GetMapping
+    public Multi<Language> getAllLanguages() {
+        return languageService.getAllLanguages();
+    }
+
     @PostMapping
     public Uni<ResponseEntity<Void>> createLanguage(@RequestBody Language language) {
         return languageService.createLanguage(language)

src/main/java/dev/mikablondo/hibernate_reactive_test/entity/LanguageEntity.java

@@ -1,7 +1,10 @@
 package dev.mikablondo.hibernate_reactive_test.entity;
 
 import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
 import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
 
 import java.util.HashSet;
 import java.util.Set;
@@ -15,6 +18,9 @@
  */
 @Entity
 @Builder
+@Getter
+@NoArgsConstructor
+@AllArgsConstructor
 @Table(name = "langage")
 public class LanguageEntity {
     @Id

src/main/java/dev/mikablondo/hibernate_reactive_test/entity/UserLanguageEntity.java

@@ -1,6 +1,9 @@
 package dev.mikablondo.hibernate_reactive_test.entity;
 
 import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
 
 /**
  * This class represents a UserLanguage entity in the database.
@@ -9,6 +12,9 @@
  * It is also annotated with @Table to specify the table name in the database.
  */
 @Entity
+@Getter
+@NoArgsConstructor
+@AllArgsConstructor
 @Table(name = "utilisateur_langage")
 @IdClass(UserLanguageId.class)
 public class UserLanguageEntity {

src/main/java/dev/mikablondo/hibernate_reactive_test/repository/LanguageRepository.java

@@ -1,6 +1,7 @@
 package dev.mikablondo.hibernate_reactive_test.repository;
 
 import dev.mikablondo.hibernate_reactive_test.entity.LanguageEntity;
+import io.smallrye.mutiny.Multi;
 import io.smallrye.mutiny.Uni;
 import lombok.RequiredArgsConstructor;
 import org.hibernate.reactive.mutiny.Mutiny;
@@ -25,4 +26,19 @@ public Uni<Void> createLanguage(LanguageEntity entity) {
                         .onFailure().invoke((Throwable t) -> System.err.println("Failed to create language: " + t.getMessage()))
         );
     }
+
+    /**
+     * This method retrieves all languages from the database.
+     *
+     * @return a Multi stream of LanguageEntity objects
+     */
+    public Multi<LanguageEntity> getAllLanguages() {
+        return sessionFactory.withSession(session ->
+                session.createQuery("FROM LanguageEntity", LanguageEntity.class)
+                        .getResultList()
+                        .onItem().transformToMulti(Multi.createFrom()::iterable)
+                        .onItem().call(language -> session.fetch(language.getUtilisateurs()))
+                        .collect().asList()
+        ).onItem().transformToMulti(Multi.createFrom()::iterable);
+    }
 }

src/main/java/dev/mikablondo/hibernate_reactive_test/services/LanguageService.java

@@ -1,13 +1,16 @@
 package dev.mikablondo.hibernate_reactive_test.services;
 
 import dev.mikablondo.hibernate_reactive_test.dto.Language;
+import dev.mikablondo.hibernate_reactive_test.dto.User;
 import dev.mikablondo.hibernate_reactive_test.entity.LanguageEntity;
 import dev.mikablondo.hibernate_reactive_test.repository.LanguageRepository;
+import io.smallrye.mutiny.Multi;
 import io.smallrye.mutiny.Uni;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
 import java.util.UUID;
+import java.util.stream.Collectors;
 
 /**
  * This class is a service for managing Language entities.
@@ -32,4 +35,25 @@ public Uni<Void> createLanguage(Language language) {
                 .nom(language.getNom())
                 .build());
     }
+
+    /**
+     * This method retrieves all languages from the database.
+     *
+     * @return a Multi<Language> containing all languages
+     */
+    public Multi<Language> getAllLanguages() {
+        return languageRepository.getAllLanguages()
+                .onItem().transform(languageEntity -> Language.builder()
+                        .id(languageEntity.getId())
+                        .nom(languageEntity.getNom())
+                        .utilisateurs(languageEntity.getUtilisateurs()
+                                .stream()
+                                .map(userLanguage -> User.builder()
+                                        .id(userLanguage.getUtilisateur().getId())
+                                        .nom(userLanguage.getUtilisateur().getNom())
+                                        .age(userLanguage.getUtilisateur().getAge())
+                                        .build())
+                                .collect(Collectors.toSet()))
+                        .build());
+    }
 }