小编mks*_*mks的帖子

这是我的代码.
我想将asset_datajson插入asset_data列中.我正在使用aws sdk.它说aws sdk现在支持json. http://aws.amazon.com/releasenotes/SDK/JavaScript/1691866671551861

var asset_data = {
    "name": "name" + i,
    "contentUrl": "http://www.hdwallpapersimages.com/nature-beauty-desktop-images/94892/",
    "size": 300,
    "headline": "headline",
    "description": "assetUrl reference for the creator",
    "encodingFormat": 'jpeg'
  };

  var params = {
    TableName: 'xyz',
    Item: { // a map of attribute name to AttributeValue
      "asset_id": {S: "asset" + i},
      "hit_id": {S: "0"},
      "created_date": {"S": Date.now().toString()},
      "status": {N: "0"},
      "operation": {S: "image_tagging"},
      "asset_data": {L: asset_data},
      "source": {S: "DAM"},
      "completed_date": {S: Date.now().toString()},
      "response_data": {S: "taged value"}
      // more …

我们如何基于索引（而不是基于主键has和range键）更新dynamodb表。
我有一个按名称创建的索引key_id-index ，哈希为asset_id，范围为hit_id。我想基于更新表，key_id-index因为更新时我不知道这些。

var paramsu = {
  TableName: 'asset',
  //IndexName: 'key_id-index',
  Key: { // The primary key of the item (a map of attribute name to AttributeValue)

    asset_id: { S: 'a' },
    hit_id: { S: 'h' }
    // more attributes...
  },
  AttributeUpdates: { // The attributes to update (map of attribute name to AttributeValueUpdate)

    key_id: {
      Action: 'PUT', // PUT (replace)
                     // ADD (adds to number or set)
                     // DELETE (delete attribute or …