BAEL-5404 - UUID as Entity ID in MongoDB

Commit to spring-data-mongodb-2

persistence-modules/spring-data-mongodb-2/src/main/java/com/baeldung/uuid/event/UuidIdentifiedEntityEventListener.java

@@ -0,0 +1,23 @@
+package com.baeldung.uuid.event;
+
+import java.util.UUID;
+
+import org.springframework.data.mongodb.core.mapping.event.AbstractMongoEventListener;
+import org.springframework.data.mongodb.core.mapping.event.BeforeConvertEvent;
+
+import com.baeldung.uuid.model.UuidIdentifiedEntity;
+
+
+public class UuidIdentifiedEntityEventListener extends AbstractMongoEventListener<UuidIdentifiedEntity> {
+    
+    @Override
+    public void onBeforeConvert(BeforeConvertEvent<UuidIdentifiedEntity> event) {
+        
+        super.onBeforeConvert(event);
+        UuidIdentifiedEntity entity = event.getSource();
+        
+        if(entity.getId() == null) {
+            entity.setId(UUID.randomUUID());
+        } 
+    }    
+}

persistence-modules/spring-data-mongodb-2/src/main/java/com/baeldung/uuid/model/Book.java

@@ -0,0 +1,26 @@
+package com.baeldung.uuid.model;
+
+import org.springframework.data.mongodb.core.mapping.Document;
+
+@Document
+public class Book extends UuidIdentifiedEntity {    
+    
+    private String title;
+    private String author;
+            
+    public String getTitle() {
+        return title;
+    }
+    
+    public void setTitle(String title) {
+        this.title = title;
+    }
+    
+    public String getAuthor() {
+        return author;
+    }
+    
+    public void setAuthor(String author) {
+        this.author = author;
+    }   
+}

persistence-modules/spring-data-mongodb-2/src/main/java/com/baeldung/uuid/model/UuidIdentifiedEntity.java

@@ -0,0 +1,25 @@
+package com.baeldung.uuid.model;
+
+import java.util.UUID;
+
+import org.springframework.data.annotation.Id;
+
+public abstract class UuidIdentifiedEntity {
+
+    @Id   
+    protected UUID id;    
+
+    public UUID getId() {
+        return id;
+    }
+    
+    public void setId(UUID id) {
+        
+        if(this.id != null) {
+            
+            throw new UnsupportedOperationException("ID is already defined");
+        }
+        
+        this.id = id;
+    }
+}

persistence-modules/spring-data-mongodb-2/src/main/java/com/baeldung/uuid/repository/BookRepository.java

@@ -0,0 +1,11 @@
+package com.baeldung.uuid.repository;
+
+import java.util.UUID;
+
+import org.springframework.data.mongodb.repository.MongoRepository;
+
+import com.baeldung.uuid.model.Book;
+
+public interface BookRepository extends MongoRepository<Book, UUID> {
+
+}

persistence-modules/spring-data-mongodb-2/src/main/java/com/baeldung/uuid/repository/CustomMongoRepository.java

@@ -0,0 +1,14 @@
+package com.baeldung.uuid.repository;
+
+import java.util.UUID;
+
+import org.springframework.data.mongodb.repository.MongoRepository;
+import org.springframework.data.repository.NoRepositoryBean;
+
+import com.baeldung.uuid.model.UuidIdentifiedEntity;
+
+
+@NoRepositoryBean
+public interface CustomMongoRepository<T extends UuidIdentifiedEntity> extends MongoRepository<T, UUID> {
+
+}

persistence-modules/spring-data-mongodb-2/src/main/java/com/baeldung/uuid/repository/impl/CustomMongoRepositoryImpl.java

@@ -0,0 +1,52 @@
+package com.baeldung.uuid.repository.impl;
+
+import java.util.List;
+import java.util.UUID;
+
+import org.springframework.data.mongodb.core.MongoOperations;
+import org.springframework.data.mongodb.repository.query.MongoEntityInformation;
+import org.springframework.data.mongodb.repository.support.SimpleMongoRepository;
+
+import com.baeldung.uuid.model.UuidIdentifiedEntity;
+import com.baeldung.uuid.repository.CustomMongoRepository;
+
+
+public class CustomMongoRepositoryImpl<T extends UuidIdentifiedEntity> extends SimpleMongoRepository<T, UUID> implements CustomMongoRepository<T> {
+
+    public CustomMongoRepositoryImpl(MongoEntityInformation<T, UUID> metadata, MongoOperations mongoOperations) {
+        
+        super(metadata, mongoOperations);        
+    }
+    
+    @Override
+    public <S extends T> S save(S entity) {
+        generateId(entity);
+        return super.save(entity);
+    }
+
+    @Override
+    public <S extends T> List<S> saveAll(Iterable<S> entities) {
+        entities.forEach(entity -> generateId(entity));
+        return super.saveAll(entities);
+    }
+
+    @Override
+    public <S extends T> S insert(S entity) {
+        generateId(entity);
+        return super.insert(entity);
+    }
+
+    @Override
+    public <S extends T> List<S> insert(Iterable<S> entities) {
+        entities.forEach(entity -> generateId(entity));
+        return super.insert(entities);
+    }
+
+    protected <S extends T> void generateId(S entity) {
+        
+        if(entity != null && entity.getId() == null) {
+            entity.setId(UUID.randomUUID());
+        }
+    }
+
+}