为什么我在用AWS合成lambda函数时得到"this.combinedGrant不是一个函数“？

Question

我正在使用AWS创建我的云堆栈，我发现错误"this.combinedGrant不是一个函数“是由下面的代码生成的，但是我找不到对它的任何引用：

    let authFunctions = [
      {
        name: 'user-registration',
        handler: 'index.register',
        code: './handlers/user-registration',
        loginAccess: loginTable.grantFullAccess,
        otpAccess: otpTable.grantWriteData
      },

..。

    for (let i in authFunctions) {
      let definition = authFunctions[i];
      let func = new Function(this, `${definition.name}-function`, {
        runtime: Runtime.NODEJS_12_X,
        handler: definition.handler,
        code: Code.asset(definition.code),
        environment: {
          LOGIN_TABLE_NAME: loginTable.tableName,
          OTP_TABLE_NAME: otpTable.tableName,
          MAILGUN_DOMAIN: credentials.mailgun.domain,
          MAILGUN_FROM: credentials.mailgun.from,
          MAILGUN_API_KEY: credentials.mailgun.api_key,
          JWT_SECRET: definition.hasJWTSecret ? "secret-placeholder" : ""
        },
        layers: [authLayer, utilityLayer],
        timeout: Duration.seconds(5)
      });

      definition.loginAccess(func);
      definition.otpAccess(func);

      let api = new RestApi(this, `${definition.name}-api`);
      api.root.addMethod('POST', new LambdaIntegration(func));
    }

Answer 1

问题是试图直接分配loginTable.grantFullAccess函数。解决方案是用字符串替换，然后使用开关情况应用它们：

    let authFunctions = [
      {
        name: 'user-registration',
        handler: 'index.register',
        code: './handlers/user-registration',
        loginAccess: 'full',
        otpAccess: 'write'
      },

..。

      switch (definition.loginAccess) {
        case 'full':
          loginTable.grantFullAccess(func);
          break;
        case 'read':
          loginTable.grantReadData(func);
          break;
      }