ReactiveMongo GridFS error saving file from disk

Question

I have an application that uses gridFS to store some images for things. Im using the gridFSBodyParser and controllers work. Now I need to seed some data from disk for a test for a particular edge case, for which I cannot use the controller because reasons. I have following code and relevant imports -

import java.nio.file.{Files, Paths}
import com.cookit.allergy.Allergy
import play.api.libs.iteratee.Enumerator
import play.modules.reactivemongo.MongoController.readFileReads
import play.modules.reactivemongo.ReactiveMongoApi
import reactivemongo.play.json._
def seedTestData(....) = {
  for {
    //create actual entity
    obj <- createEntity(....)
    //create avatar for entity
    gridFS <- mongo.asyncGridFS.flatMap(gridFS => {
      val url = this.getClass.getClassLoader.getResource("test.jpg")
      gridFS.save(
        Enumerator.enumerate(List(Files.readAllBytes(Paths.get(url.getPath)))),
        gridFS.fileToSave(Some(name), Some("image/jpeg"), None, buildMD(obj)))
    }).map(result => {
      logger.info(.....)
    }).recover({
      case e: Exception =>
        logger.error(....)
        e.printStackTrace()
        throw e
    })
  } yield {
    ....
  }
}

My problem is with id generation. It complains that -

play.api.libs.json.JsResultException: JsResultException(errors:List((,List(JsonValidationError(List(List((,List(JsonValidationError(List(List((,List(JsonValidationError(List(List((,List(JsonValidationError(List(Wrong ObjectId (length != 24): '4c75f45d255045a2aac01fdbbe031c11'),WrappedArray()))))),WrappedArray()))))),WrappedArray()))))),WrappedArray())))))

I suspect it has something to do with the JSON serialization, but I cannot figure out exactly where the problem is.

Answer 1

基本上，我最终传递了一个自定义FileToSave[JSONSerializationPack.type, JsValue]实现而不是gridFS.fileToSave(....)并覆盖了包、文件名、内容类型、上传日期和元数据字段。