尝试连接 HOC

Question

我正在尝试使用用户角色来确定是否显示组件。所以我尝试使用 HOC 来处理该功能，但我收到一个我不太明白的错误。这是代码：

import React from 'react';
import { getUserRoles } from 'modules/api/account/user/selectors';
import { connect } from 'react-redux';

const RestrictedOrFallBack = ({
    wrappedComponent,
    role,
    userRoles,
    fallback,
}) => {
    if (userRoles.includes(role)) return wrappedComponent;
    return fallback;
};

const mapStateToProps = state => ({
    userRoles: getUserRoles(state),
});

const ConnectedRestrictedOrFallback = connect(mapStateToProps)(RestrictedOrFallBack);

export { RestrictedOrFallBack };
export default ({
    role,
    fallback = () => (<div />),
}) => WrappedComponent => (
    <ConnectedRestrictedOrFallback
        role={role}
        fallback={fallback}
        WrappedComponent={WrappedComponent}
    />
);

我得到的错误是：React.createElement: type is invalid -- expected a string (for built-in components) or a class/function (for composite components) but got: <Connect(RestrictedOrFallBack) />

我做错了什么？

编辑：根据答案更新代码

import React from 'react';
import { getUserRoles } from 'modules/api/account/user/selectors';
import { connect } from 'react-redux';
import compose from 'utility/compose';

const RestrictedOrFallBack = ({
    wrappedComponent,
    role,
    userRoles,
    fallback,
}) => {
    debugger;
    if (userRoles && userRoles.includes(role)) return wrappedComponent;
    return fallback;
};

const mapStateToProps = state => ({
    userRoles: getUserRoles(state),
});

const ConnectedRestrictedOrFallback = compose(
    connect(mapStateToProps),
    RestrictedOrFallBack,
);

export { RestrictedOrFallBack };
export default ({
    role,
    fallback = () => (<div />),
}) => wrappedComponent => ConnectedRestrictedOrFallback({
    role,
    fallback,
    wrappedComponent,
});

Answer 1

你不能 "connect" HOC。 "connect" returns HOC 本身和 HOC 只能应用于实际组件。

您要做的是compose 2 个 HOC 组成一个新的 HOC。

所以你会做这样的事情：

import { connect, compose } from 'redux';

const ConnectedRestrictedOrFallback = compose(
    connect(mapStateToProps),
    RestrictedOrFallback
);

尝试连接 HOC

Trying to connect an HOC

connect

reactjs

redux

react-redux

higher-order-components