Blockchain 如何更深入地了解chainlink req.add（“path”）请求的JSON正文？增加2+；路径

我可以通过

req.add（“path”，“chainlink”）

但是，我想返回价格值，

“chainlink”，“USD”

。输出json有两条路径，如何到达第二条路径以获得价格值

  function requestLINKPrice() 
    public
    onlyOwner
  {
    Chainlink.Request memory req = buildChainlinkRequest(JOB, address(this), this.fulfill.selector);
    req.add("get", "https://api.coingecko.com/api/v3/simple/price?ids=chainlink&vs_currencies=usd");
    req.add("path", "chainlinkUSD");
    req.addInt("times", 100);
    sendChainlinkRequestTo(ORACLE, req, ORACLE_PAYMENT);
  }

下面是API的JSON响应

{
  chainlink: {
    usd: 3.78
  }
}

您可以将与

copyPath

语法一起使用

string[] memory copyPath = new string[](2);
copyPath[0] = "chainlink";
copyPath[1] = "USD";
req.addStringArray("copyPath", copyPath);

下面是整个函数

  function requestLINKPrice() 
    public
    onlyOwner
  {
    Chainlink.Request memory req = buildChainlinkRequest(JOB, address(this), this.fulfill.selector);
    req.add("get", "https://api.coingecko.com/api/v3/simple/price?ids=chainlink&vs_currencies=usd");
    string[] memory copyPath = new string[](2);
    copyPath[0] = "chainlink";
    copyPath[1] = "USD";
    req.addStringArray("copyPath", copyPath);
    req.addInt("times", 100);
    sendChainlinkRequestTo(ORACLE, req, ORACLE_PAYMENT);
  }