如何序列化 PersistentMap 和 return 它

Question

我有一个简单的 map 并想添加到它并 return 它序列化。这是我的代码

organizations: PersistentMap<string, string> = new PersistentMap<
    string,
    string
  >("oc"); 

getOrgList(): PersistentMap<string, string> {
    return this.organizations;
  }

合约调用panic如下：

kind: {
    ExecutionError: 'Smart contract panicked: Cannot parse JSON, filename: "~lib/assemblyscript-json/decoder.ts" line: 144 col: 5'      
  },

更新：当地图为空时，我不会收到任何错误。我使用

将项目添加到地图

this.organizations.set(orgCode, orgName);

然后我就这样从命令行调用它

near call cert.msaudi.testnet createOrgId '{\"orgCode\":\"AAA\",\"orgName\":\"AAAA\"}' --accountId=msaudi.testnet

编辑：完整合约代码

import { Context, PersistentMap } from "near-sdk-core";

@nearBindgen
export class Contract {
  public organizations: PersistentMap<string, string> = new PersistentMap<
    string,
    string
  >("oc"); //orgCode, orgName

  //check if organization name is there from the frontend to save processing time.
  @mutateState()
  createOrgId(orgCode: string, orgName: string): string {
    this.organizations.set(orgCode, orgName);
    return "Organization created with code:" + orgCode + " name: " + orgName;
  }

  getOrgList(): PersistentMap<string, string> {
    return this.organizations;
  }
}

Answer 1

如果你想从合约return一个正规的地图，你需要将地图从PersistentMap<string,string>解析为一个正规的Map<string,string>。不仅如此，如果您想 return 除键之外的所有值，还需要与地图分开跟踪键。那是因为 PersistentMap 不存储密钥，您无法检索它们 (Here's a separate thread about it)。

 keys: PersistentVector<string>; // Need to store the keys as well

 getOrgList(): Map<string, string> {
    const res: Map<string, string> = new Map<string, string>();
    for (let i = 0; i < this.keys.length; i++) {
      res.set(this.keys[i], this.organizations.getSome(this.keys[i]));
    }
    return res;
 }

如何序列化 PersistentMap 和 return 它

How to serialize PersistentMap and return it

nearprotocol