从 web3js 调用 Factory 合约的子函数

Posted 2023-02-18

【中文标题】从 web3js 调用 Factory 合约的子函数

【英文标题】：Calling function in child of Factory contract from web3js

【发布时间】：2019-07-08 18:41:19

【问题描述】：

给定一份​​合同Example和一份工厂合同ExampleFactory：

//Example.sol

contract ExampleFactory 
  Example [] public examples;

 function newExample(bytes32 _name) 
   Example example = new Example(_name);
   examples.push(example);
 


contract Example 

  bytes32 public name;
  bool printed;
  event Print(bytes32);

  constructor(bytes32 _name) 
    name = _name;
  

  function printName() public 
    printed = true;
    emit Print(name);
  

如何在我的truffle test 中调用printName？：

//Example.test.sol

artifacts.require("ExampleFactory");

contract("Example", function () 

  beforeEach(async function() 
    this.exampleFactory = await ExampleFactory.new()
    await ExampleFactory.newExample(web3.utils.utf8ToHex("hello"))
  )

  describe("printName()", function () 

    it("PRINTS!", async function() 
     const example = await this.exampleFactory.examples(0);
     await example.printName() // example.printName is not a function!!
    )

  )
)

【参考方案1】：

调用this.exampleFactory.examples(0)返回子合约的地址，web3.js不知道ABI。 需要导入孩子的ABI，并用地址实例化一个对象

artifacts.require("Example" )

Const example = await Example.at(await this.exampleFactory.examples(0))