Question

我遇到使用MongoJack和updateById方法的问题。

在来自MongoJack的javadoc中，它声明方法updateById（K，T）（link to javadoc）可以与K一起使用，T作为要保存的对象。但是，以下代码和测试表明情况并非如此。完整的源代码可以在Github找到：https://github.com/nilsmagnus/mongojackupdatebyid/。

要保存的对象：

package no.nils.mongoupdate;

  public class Scenario {
  public String _id;
  public String name;

  public Scenario(String name) {
    this.name = name;
  }

  public String get_id() {
    return _id;
  }

  public String getName() {
    return name;
  }
}

更新课程：

package no.nils.mongoupdate;

import org.mongojack.JacksonDBCollection;
import org.mongojack.WriteResult;
import com.mongodb.DB;
import com.mongodb.DBCollection;

class ScenarioStorage {
private JacksonDBCollection<Scenario, String> scenarioCollection;

public ScenarioStorage(DB db) {
    DBCollection dbCollection = db.getCollection("scenario");
    scenarioCollection = JacksonDBCollection.wrap(dbCollection, Scenario.class, String.class);
}

public void update(Scenario scenario) {
    WriteResult<Scenario, String> writeResult = scenarioCollection.updateById(scenario._id, scenario);
    if (writeResult.getError() != null) throw new RuntimeException(writeResult.getError());
}

public String saveNewScenario(Scenario scenario) {
    WriteResult<Scenario, String> writeResult = scenarioCollection.insert(scenario);
    if (writeResult.getError() != null) throw new RuntimeException(writeResult.getError());
    return writeResult.getSavedId();
}


public Scenario getScenario(String id) {
    return scenarioCollection.findOneById(id);
}
}

显示失败的测试：

package no.nils.mongoupdate;

import java.net.UnknownHostException;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;

import org.junit.Before;
import org.junit.Test;
import com.mongodb.DB;
import com.mongodb.MongoClient;

public class ScenarioStorageTest {

private ScenarioStorage storage;

@Before
public void createDb() throws UnknownHostException {
    MongoClient mongoClient = new MongoClient("localhost", 27017);
    DB db = mongoClient.getDB("junittest");
    storage = new ScenarioStorage(db);
}

@Test
public void shouldUpdateNameAfterUpdate() {
    Scenario scenario = new Scenario("first");
    final String id = storage.saveNewScenario(scenario);
    scenario._id = id;
    scenario.name = "newname";
    storage.update(scenario);
    Scenario updated = storage.getScenario(id);
    assertNotNull("Stored object should have been fetched.", updated.name);
    assertEquals("The stored object should now have the name 'newname'.", updated.name, "newname");
}
}

第一次断言测试失败。请告知我是否误解了mongojack的javadoc或我可能犯的任何其他错误。

Answer 1

好的，javadoc和教程已经破解。解决方案是将注释@ObjectId添加到_id字段。

@ObjectId
public String _id;

使用MongoJack和updateById

1 个答案: