在dynamodb中使用掃描過濾嵌套數組

Question

我試圖用嵌套數組計算出 DynamoDB 掃描。 我試圖根據嵌套數組中的調查 ID 獲取用戶詳細信息，我的表值是這樣的。

{
 "id": "28009dd8-5802-20f5-c7c9-af53e710ac91",
 "user": {
  "address1": "1, Park avenue",
  "address2": "Austin",
  "birthDate": "1999-01-01",
  "city": "Austin",
  "contact": "9876543210",
  "country": "1",
  "email": "rajmohan@gm.com",
  "emgContact": "2",
  "empStatus": "1",
  "ethnicity": "5",
  "firstName": "Rajmohan",
  "gender": "male",
  "highLevelEduc": "2",
  "image": "",
  "lName": "V",
  "mName": "",
  "nationality": "1",
  "relationalStatus": "1",
  "state": "43",
  "telephone": "9876543210",
  "zipCode": "70031"
 },
 "survey": [
  {
   "id": "e8de014a-22c1-12bf-4653-577c8031138",
   "email": "rajmohan@gm.com",
   "method": [
    "email"
   ],
   "name": "Rajmohan",
   "onDemand": "yes",
   "pollSchedule": "None",
   "pollTarget": "Educator",
   "telephone": "963696369",
   "user_id": "413ca05f-ed91-50e7-1974-3e0280ca4a3d"
  },
  {
   "id": "5f4db059-c8a3-e673-iygk-d857425e1077",
   "created_at": 1674459043374,
   "email": "test@gmail.com",
   "method": [
    "email"
   ],
   "name": "New testing",
   "onDemand": "yes",
   "pollSchedule": "None",
   "pollTarget": "Educator",
   "telephone": "963696369",
   "user_id": "413ca05f-ed91-50e7-2635-3e0280ca4a3d"
  }
 ],
 "summary": "test",
 "user": "413ca05f-ed91-8k8y-2635-3e0280ca4a3d"
}

我的掃描語法就是這樣。

var param = {
        TableName: 'user',
        FilterExpression: 'contains(#survey.#id,:id)',
        ExpressionAttributeNames: {
            '#survey': 'survey',
            '#id':'id'   
        },
        ExpressionAttributeValues: {
            ':id': id
        },
      }

但我無法獲得價值。 我的觀點是基於我需要獲得用戶價值的調查ID。

Answer 1

你不能做你正在嘗試的事情，你需要傳遞 map 的全部價值，我敢肯定這很難做到。

使用地圖列表

當使用contains function 時，您需要知道整個 map 值，因為您詢問的是列表中是否包含 map，而不是字符串是否包含在 map 中：

var mymap = {
   "id": "e8de014a-22c1-12bf-4653-577c8031138",
   "email": "rajmohan@gm.com",
   "method": [
    "email"
   ],
   "name": "Rajmohan",
   "onDemand": "yes",
   "pollSchedule": "None",
   "pollTarget": "Educator",
   "telephone": "963696369",
   "user_id": "413ca05f-ed91-50e7-1974-3e0280ca4a3d"
  }

var param = {
        TableName: 'user',
        FilterExpression: 'contains(#survey,:mymap)',
        ExpressionAttributeNames: {
            '#survey': 'survey'
        },
        ExpressionAttributeValues: {
            ':mymap': mymap
        },
      }

---

使用嵌套地圖

您應該將列表結構化為 map：

 "survey": {
 "e8de014a-22c1-12bf-4653-577c8031138":{
   "email": "rajmohan@gm.com",
   "method": [
    "email"
   ],
   "name": "Rajmohan",
   "onDemand": "yes",
   "pollSchedule": "None",
   "pollTarget": "Educator",
   "telephone": "963696369",
   "user_id": "413ca05f-ed91-50e7-1974-3e0280ca4a3d"
  },
  "5f4db059-c8a3-e673-iygk-d857425e1077": {
   "created_at": 1674459043374,
   "email": "test@gmail.com",
   "method": [
    "email"
   ],
   "name": "New testing",
   "onDemand": "yes",
   "pollSchedule": "None",
   "pollTarget": "Educator",
   "telephone": "963696369",
   "user_id": "413ca05f-ed91-50e7-2635-3e0280ca4a3d"
  }
 }

var id = "5f4db059-c8a3-e673-iygk-d857425e1077"
var param = {
        TableName: 'user',
        FilterExpression: 'attribute_exists(#survey.#id)',
        ExpressionAttributeNames: {
            '#survey': 'survey',
            '#id': id 
        }
      }