Question

使用django rest框架作为后端，使用angularjs作为前端

后端

class ReleaseBugs(models.Model):
    bug_name = models.CharField(max_length=30)
    bug_image = models.ImageField(blank=True, null=True, upload_to='release_bugs/')

class ReleaseBugsSerializer(serializers.ModelSerializer):
    class Meta:
        model = ReleaseBugs
        fields = '__all__'

前端

Upload.upload({
        method: 'PUT',
        url: api_url + '/' + data.id + '/' ,
        data: data
    }).then();

Upload.upload({
        method: 'POST',
        url: api_url + '/' + data.id + '/' ,
        data: data
    }).then();

问题当第一次上传图像，完成后，后端将bug_image转换为url，而不是当我想要修改数据（例如bug_name）并再次发布时，这是被禁止的。我有一个解决方案，当重新发布数据时，使用ng-upload-file将url转换为blob
```
Upload.urlToBlob($scope.release_bug.bug_image).then(function(blob) {
                $scope.release_bug.bug_image = blob;
                // do post
            });
```
但是，这种方式只是上传具有不同文件名的相同图像。我认为这是浪费时间和空间。

我是新手，有更好的方法吗？

Answer 1

提出了解决方案，只需在视图集更新时进行更新，而不使用Serilizer

org.apache.spark.SparkException: Task failed while writing rows
    at org.apache.spark.sql.execution.datasources.FileFormatWriter$.org$apache$spark$sql$execution$datasources$FileFormatWriter$$executeTask(FileFormatWriter.scala:270)
    at org.apache.spark.sql.execution.datasources.FileFormatWriter$$anonfun$write$1$$anonfun$apply$mcV$sp$1.apply(FileFormatWriter.scala:189)
    at org.apache.spark.sql.execution.datasources.FileFormatWriter$$anonfun$write$1$$anonfun$apply$mcV$sp$1.apply(FileFormatWriter.scala:188)
    at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
    at org.apache.spark.scheduler.Task.run(Task.scala:108)
    at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:338)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
    at com.geaviation.pivotTypes.LeftJoinTty$$anonfun$main$1$$anonfun$3.apply(LeftJoinTty.scala:145)
    at com.geaviation.pivotTypes.LeftJoinTty$$anonfun$main$1$$anonfun$3.apply(LeftJoinTty.scala:128)
    at scala.collection.Iterator$$anon$11.next(Iterator.scala:409)
    at scala.collection.Iterator$$anon$11.next(Iterator.scala:409)
    at scala.collection.Iterator$$anon$11.next(Iterator.scala:409)
    at org.apache.spark.sql.execution.datasources.FileFormatWriter$SingleDirectoryWriteTask.execute(FileFormatWriter.scala:324)
    at org.apache.spark.sql.execution.datasources.FileFormatWriter$$anonfun$org$apache$spark$sql$execution$datasources$FileFormatWriter$$executeTask$3.apply(FileFormatWriter.scala:256)
    at org.apache.spark.sql.execution.datasources.FileFormatWriter$$anonfun$org$apache$spark$sql$execution$datasources$FileFormatWriter$$executeTask$3.apply(FileFormatWriter.scala:254)
    at org.apache.spark.util.Utils$.tryWithSafeFinallyAndFailureCallbacks(Utils.scala:1371)
    at org.apache.spark.sql.execution.datasources.FileFormatWriter$.org$apache$spark$sql$execution$datasources$FileFormatWriter$$executeTask(FileFormatWriter.scala:259)
    ... 8 more

ng-upload-file和django rest框架使用filefield发布和更新数据

1 个答案: