我试图从两个不同的地方调用React组件的细雨useCacheCall（）钩子。这是被调用的React组件
const FamilyContainer = ({ member }) => {
console.log("inside family container, member: ", member);
const { useCacheCall } = drizzleReactHooks.useDrizzle();
const organization = useCacheCall("MyContract", "getOrganization", member);
console.log("organization: ", organization && organization);
const maxLevel = useCacheCall("MyContract", "levels");
console.log("maxLevel: ", maxLevel && typeof maxLevel);
if (!isLoaded(organization) || !isLoaded(maxLevel)) {
return "loading...";
}
if (isEmpty(organization) || isEmpty(maxLevel)) return <PageNotFound />;
return (
<FamilySection
organization={organization}
maxLevel={parseInt(maxLevel, 10)}
/>
);
};
export default FamilyContainer;
我正在通过复制网址粘贴到浏览器地址栏的方式从第一位置调用上述React组件： http：// localhost：3000 /＃/ invited / 7434DC1BF0 成功执行。这是调用代码：
const InviteReceived = ({ playerAccount, inviterData }) => {
const useStyles = makeStyles((theme) => ({
root: {
flexGrow: 1,
},
}));
const classes = useStyles();
const history = useHistory();
return (
<Grid container spacing={0}>
<Grid item xs={12} sm={12} md={12} lg={5}>
<Box
display="flex"
flexDirection="column"
justifyContent="center"
p={1}
m={0}
bgcolor="black"
>
<InviteReceivedSection
playerAccount={playerAccount}
inviterAccount={inviterData.ID}
/>
<PayTributeSection playerAccount={playerAccount} />
</Box>
</Grid>
<Grid item xs={12} sm={12} md={12} lg={7}>
<FamilyContainer member={inviterData.ID} />
</Grid>
</Grid>
);
};
export default InviteReceived;
从完全相同的React组件的第二个位置进行调用，方法是将该URL复制并粘贴到浏览器地址栏： http：// localhost：3000 /＃/ member / 0x16Aa59291f0C27586B87CDcF48630cB721Dcd0cC ，从而不断重复失败错误消息： TypeError：无法读取未定义的属性“方法” 。但是，如果我先运行第一个调用，然后再调用第二个组件（使用URL），则不会发生错误（很奇怪）。
const MemberComponent = ({ playerAccount }) => {
console.log("Inside member component, playeraccount ", playerAccount);
const useStyles = makeStyles((theme) => ({
root: {
flexGrow: 1,
},
}));
const classes = useStyles();
const history = useHistory();
return (
<Grid container spacing={0}>
<Grid item xs={12} sm={12} md={12} lg={5}>
<Box
display="flex"
flexDirection="column"
justifyContent="center"
p={1}
m={0}
bgcolor="black"
>
<ProfileDetailsSection playerAccount={playerAccount} />
<RecruitSection playerAccount={playerAccount} />
</Box>
</Grid>
<Grid item xs={12} sm={12} md={12} lg={7}>
<FamilyContainer member={playerAccount} />
</Grid>
</Grid>
);
};
export default MemberComponent;
这是错误跟踪：
TypeError: Cannot read property 'methods' of undefined
current
C:/src/hooks/create-use-cache-call.js:19
16 | {}
17 | )
18 | } else {
> 19 | const instance = drizzle.contracts[contractNameOrNames]
| ^ 20 | const cacheKey = instance.methods[methodNameOrFunction].cacheCall(...args)
21 | const cache =
22 | drizzleState.contracts[contractNameOrNames][methodNameOrFunction][
View compiled
e.useDrizzleState
C:/src/hooks/index.js:36
33 |
34 | // This is the escape hatch mentioned above. We keep a ref to `args` and whenever they change, we immediately update the state just like in the subscription.
35 | // This won't have any effect if `args` is undefined.
> 36 | const argsRef = useRef(args)
| ^ 37 | const [state, setState] = useState(
38 | mapStateRef.current(drizzle.store.getState())
39 | )
View compiled
(anonymous function)
C:/src/hooks/create-use-cache-call.js:8
5 | methodNameOrFunction,
6 | ...args
7 | ) => {
> 8 | const isFunction = typeof methodNameOrFunction === 'function'
9 | const drizzleState = useDrizzleState(drizzleState => {
10 | if (isFunction) {
11 | return contractNameOrNames.reduce(
View compiled
FamilyContainer
C:/code/MyContract/codebase/client/src/containers/FamilyContainer.js:10
7 | const FamilyContainer = ({ member }) => {
8 | console.log("inside family container, member: ", member);
9 | const { useCacheCall } = drizzleReactHooks.useDrizzle();
> 10 | const organization = useCacheCall("MyContract", "getOrganization", member);
11 | console.log("organization: ", organization && organization);
12 |
13 | const maxLevel = useCacheCall("MyContract", "levels");
View compiled
▶ 16 stack frames were collapsed.
Module../src/index.js
C:/code/MyContract/codebase/client/src/index.js:100
97 | const drizzle = new Drizzle(drizzleOptions, reduxStore);
98 | console.log("Drizzle: ", drizzle, " reduxStore: ", reduxStore);
99 |
> 100 | ReactDOM.render(
101 | <React.StrictMode>
102 | <ThemeProvider theme={theme}>
103 | <drizzleReactHooks.DrizzleProvider drizzle={drizzle}>
View compiled
__webpack_require__
C:/code/MyContract/codebase/client/webpack/bootstrap:784
781 | };
782 |
783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
| ^ 785 |
786 | // Flag the module as loaded
787 | module.l = true;
View compiled
fn
C:/code/MyContract/codebase/client/webpack/bootstrap:150
147 | );
148 | hotCurrentParents = [];
149 | }
> 150 | return __webpack_require__(request);
| ^ 151 | };
152 | var ObjectFactory = function ObjectFactory(name) {
153 | return {
View compiled
1
http://localhost:3000/static/js/main.chunk.js:7398:18
__webpack_require__
C:/code/MyContract/codebase/client/webpack/bootstrap:784
781 | };
782 |
783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
| ^ 785 |
786 | // Flag the module as loaded
787 | module.l = true;
View compiled
checkDeferredModules
C:/code/MyContract/codebase/client/webpack/bootstrap:45
42 | }
43 | if(fulfilled) {
44 | deferredModules.splice(i--, 1);
> 45 | result = __webpack_require__(__webpack_require__.s = deferredModule[0]);
| ^ 46 | }
47 | }
48 |
View compiled
Array.webpackJsonpCallback [as push]
http://localhost:3000/static/js/bundle.js:33:19
30 | /******/ deferredModules.push.apply(deferredModules, executeModules || []);
31 | /******/
32 | /******/ // run deferred modules when all chunks ready
> 33 | /******/ return checkDeferredModules();
| ^ 34 | /******/ };
35 | /******/ function checkDeferredModules() {
36 | /******/ var result;
View source
更新：另外，我发现仅当我直接在地址栏中发布链接时才会出现问题。但是，如果从其他某个组件内部遍历该组件，则不会发生该错误。关于为什么的任何想法？有什么想法可能仅在一次调用中引起问题吗？
答案 0 :(得分：0)
最终找到了问题。因为我是直接使用URL，所以第二次调用（一个抛出错误）是在毛毛雨正确初始化并建立与以太坊的连接之前执行useCacheCall（）。在我的
<drizzleReactHooks.Initializer
error="There was an error."
loadingContractsAndAccounts="loading contracts & accounts..."
loadingWeb3="loading web3..."
>
<App/>
</drizzleReactHooks.Initializer>