Как разместить json-массив в AWS dynamodb

Question

Как мы можем вставить следующие данные в историю aws dynamodb.

{ 
    "userId":"4", 
    "gpId": "44", 
    "uname": "username", 
    "position":"Cloud Solution Engineer", 
    "companyName" : "xyz Technlologies", 
    "skills": [{"linux":"1","windows":"2","Docker": "3"}] 
} 

Я попытался, используя следующий код в node.js

var userId=event.userId; 
    var gpId=event.gpId; 
    var fbId=event.fbId; 
    var uname=event.uname; 
    var position=event.position; 
    var role=event.role; 
    var companyName=event.companyName; 
    var skills=event.skills; 

dynamodb.putItem({ 
     "TableName": tableName, 
     "Item" : { 
      "userId": {"N": userId}, 
      "gpId": {"N": gpId}, 
      "uname" : {"S":uname}, 
      "position" : {"S":position}, 
      "role" : {"S":role}, 
      "companyName" : {"S":companyName}, 
      "skills" : {"SS":skills} 
     } 

Я пытаюсь код ниже он дает ниже ошибки мне.

{ 
    "errorMessage": "Expected params.Item['skills'].S to be a string", 
    "errorType": "InvalidParameterType", 
    "stackTrace": [ 
    "ParamValidator.fail (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:50:37)", 
    "ParamValidator.validateType (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:218:10)", 
    "ParamValidator.validateString (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:150:14)", 
    "ParamValidator.validateScalar (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:130:21)", 
    "ParamValidator.validateMember (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:94:21)", 
    "ParamValidator.validateStructure (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:75:14)", 
    "ParamValidator.validateMember (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:88:21)", 
    "ParamValidator.validateMap (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:117:14)", 
    "ParamValidator.validateMember (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:92:21)", 
    "ParamValidator.validateStructure (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:75:14)" 
    ] 
} 

Я попытался изменить {"S": skills} с skills.

это дает мне следующую ошибку:

{ 
    "errorMessage": "Unexpected key '0' found in params.Item['skills']", 
    "errorType": "UnexpectedParameter", 
    "stackTrace": [ 
    "ParamValidator.fail (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:50:37)", 
    "ParamValidator.validateStructure (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:77:14)", 
    "ParamValidator.validateMember (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:88:21)", 
    "ParamValidator.validateMap (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:117:14)", 
    "ParamValidator.validateMember (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:92:21)", 
    "ParamValidator.validateStructure (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:75:14)", 
    "ParamValidator.validateMember (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:88:21)", 
    "ParamValidator.validate (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:34:10)", 
    "Request.VALIDATE_PARAMETERS (/var/runtime/node_modules/aws-sdk/lib/event_listeners.js:109:42)", 
    "Request.callListeners (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:105:20)" 
    ] 
} 

Я попытался карту применения, как это предлагается в ответ, но это дает мне следующую ошибку:

{ 
    "errorMessage": "There were 3 validation errors:\n* UnexpectedParameter: Unexpected key 'linux' found in params.Item['skills'].M['0']\n* UnexpectedParameter: Unexpected key 'windows' found in params.Item['skills'].M['0']\n* UnexpectedParameter: Unexpected key 'Docker' found in params.Item['skills'].M['0']", 
    "errorType": "MultipleValidationErrors", 
    "stackTrace": [ 
    "* UnexpectedParameter: Unexpected key 'linux' found in params.Item['skills'].M['0']", 
    "* UnexpectedParameter: Unexpected key 'windows' found in params.Item['skills'].M['0']", 
    "* UnexpectedParameter: Unexpected key 'Docker' found in params.Item['skills'].M['0']", 
    "ParamValidator.validate (/var/runtime/node_modules/aws-sdk/lib/param_validator.js:40:28)", 
    "Request.VALIDATE_PARAMETERS (/var/runtime/node_modules/aws-sdk/lib/event_listeners.js:109:42)", 
    "Request.callListeners (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:105:20)", 
    "callNextListener (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:95:12)", 
    "/var/runtime/node_modules/aws-sdk/lib/event_listeners.js:75:9", 
    "finish (/var/runtime/node_modules/aws-sdk/lib/config.js:308:7)", 
    "/var/runtime/node_modules/aws-sdk/lib/config.js:324:9", 
    "EnvironmentCredentials.get (/var/runtime/node_modules/aws-sdk/lib/credentials.js:126:7)", 
    "getAsyncCredentials (/var/runtime/node_modules/aws-sdk/lib/config.js:318:24)", 
    "Config.getCredentials (/var/runtime/node_modules/aws-sdk/lib/config.js:338:9)" 
    ] 
} 

Answer 1

skills не является строкой набора (СС), он должен иметь тип атрибута Карта (M) после следующего присваивания 0-индекса:

var skills = event.skills[0]; 

http://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_AttributeValue.html