Question

我们在Scala中使用Android上的Robospice和ORMLite模块进行持久化，并且在将外部集合保存到数据库时遇到了困难。数据正在正确接收（即我们正在使用几个帖子正确地解释和解释用户）但是当需要将数据保存到缓存时，它无法保存国外集合。

我们已通过控制台获得此异常，但您可以看到用户确实有一个setter和getter，因此我们不确定问题可能是什么。

java.lang.IllegalArgumentException: Could not find appropriate set method for private java.util.Collection scaloid.scala_test.models.User.posts
        at com.j256.ormlite.field.DatabaseFieldConfig.findSetMethod(DatabaseFieldConfig.java:576)
        at com.octo.android.robospice.persistence.ormlite.InDatabaseObjectPersister.saveAllForeignObjectsToCache(InDatabaseObjectPersister.java:192)
        at com.octo.android.robospice.persistence.ormlite.InDatabaseObjectPersister$1.call(InDatabaseObjectPersister.java:96)
        at com.octo.android.robospice.persistence.ormlite.InDatabaseObjectPersister$1.call(InDatabaseObjectPersister.java:91)
        at com.j256.ormlite.misc.TransactionManager.callInTransaction(TransactionManager.java:168)
        at com.j256.ormlite.stmt.StatementExecutor.callBatchTasks(StatementExecutor.java:553)
        at com.j256.ormlite.dao.BaseDaoImpl.callBatchTasks(BaseDaoImpl.java:633)
        at com.j256.ormlite.dao.RuntimeExceptionDao.callBatchTasks(RuntimeExceptionDao.java:534)
        at com.octo.android.robospice.persistence.ormlite.InDatabaseObjectPersister.saveDataToCacheAndReturnData(InDatabaseObjectPersister.java:91)
        at com.octo.android.robospice.persistence.CacheManager.saveDataToCacheAndReturnData(CacheManager.java:77)
        at com.octo.android.robospice.request.DefaultRequestRunner.saveDataToCacheAndReturnData(DefaultRequestRunner.java:265)
        at com.octo.android.robospice.request.DefaultRequestRunner.processRequest(DefaultRequestRunner.java:172)
        at com.octo.android.robospice.request.DefaultRequestRunner$1.run(DefaultRequestRunner.java:216)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
        at java.util.concurrent.FutureTask.run(FutureTask.java:237)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
        at java.lang.Thread.run(Thread.java:841)

这是用户模型。

@JsonIgnoreProperties(ignoreUnknown = true)
@DatabaseTable(tableName = "u_old")
class User @JsonCreator()() {

  @JsonProperty("name")
  @DatabaseField
  var name: String = ""

  @JsonProperty("email")
  @DatabaseField
  var email: String = ""

  @JsonProperty("id")
  @DatabaseField(id = true)
  var id : Int = 0

  @JsonProperty("posts")
  @ForeignCollectionField
  private var posts: util.Collection[Post] = null

  def getPosts: util.Collection[Post] = this.posts

  def setPosts(posts : util.Collection[Post]) : Unit = {
    this.posts = posts
  }

}

和Post模型。

@JsonIgnoreProperties(ignoreUnknown = true)
@DatabaseTable(tableName = "p_old")
class Post @JsonCreator()() {

  @JsonProperty("title")
  @DatabaseField
  var title : String = ""

  @JsonProperty("body")
  @DatabaseField
  var body : String = ""

  @JsonProperty("id")
  @DatabaseField(id = true)
  var id : Int = 0

  @JsonProperty("user")
  @DatabaseField(foreign = true, foreignAutoCreate = true, foreignAutoRefresh = true)
  private var user : User = null

  def getUser : User = this.user

  def setUser(user : User) {
    this.user = user
  }

}

我们在这里做错了什么吗？或者这只是Scala和ORMLite的错误？对此的任何帮助将不胜感激。

使用Robospice和Scala在ORMLite中保存外来集合

0 个答案: