Question

您知道如何创建客户端列表控制器吗？

我检查了StackOverflow-没有找到问题的答案。

是否有一种简单的方法来创建资源，该资源在第一页加载时从服务器读取所有记录。然后在客户端完成排序，筛选，分页。还可以选择禁用分页。

我试图复制ra-core的ListController.js和ra-ui-materialui的List.js并对其进行自定义，但是出错了，我可以继续。我是新来做出反应并进行PoC的人。

这是错误：

TypeError：无法读取未定义的属性“ apply”
      （匿名函数）
      node_modules / recompose / compose.js：22
      19 |
      20 | return funcs.reduce（function（a，b）{
      21 |返回函数（）{
      22 |返回a（b.apply（undefined，arguments））;
      23 | };
      24 | }）;
      25 | }
      查看编译的
      ./src/ListController.js
      src / ListController.js：431
      428 |导出默认的compose（
      429 | connect（
      430 | mapStateToProps，
      431 | {
      432 | crudGetList：crudGetListAction，
      433 | changeListParams：changeListParamsAction，
      434 | setSelectedIds：setListSelectedIdsAction，
      查看已编译

我已将导入从相对路径更改为导入react-admin；有关如何解决该错误的任何建议？

这是更改后的ListController.js文件：

/* eslint no-console: ["error", { allow: ["warn", "error"] }] */
import { Component } from 'react';
import PropTypes from 'prop-types';
import { connect } from 'react-redux';
import { parse, stringify } from 'query-string';
import { push as pushAction } from 'react-router-redux';
import compose from 'recompose/compose';
import { createSelector } from 'reselect';
import inflection from 'inflection';
import debounce from 'lodash/debounce';
import isEqual from 'lodash/isEqual';
import pickBy from 'lodash/pickBy';

import removeEmpty from 'react-admin';
import queryReducer, {
    SET_SORT,
    SET_PAGE,
    SET_PER_PAGE,
    SET_FILTER,
    SORT_DESC,
} from 'react-admin';
import { crudGetList as crudGetListAction } from 'react-admin';
import {
    changeListParams as changeListParamsAction,
    setListSelectedIds as setListSelectedIdsAction,
    toggleListItem as toggleListItemAction,
} from 'react-admin';
import translate from 'react-admin';
import removeKey from 'react-admin';

/**
 * List page component
 *
 * The <List> component renders the list layout (title, buttons, filters, pagination),
 * and fetches the list of records from the REST API.
 * It then delegates the rendering of the list of records to its child component.
 * Usually, it's a <Datagrid>, responsible for displaying a table with one row for each post.
 *
 * In Redux terms, <List> is a connected component, and <Datagrid> is a dumb component.
 *
 * Props:
 *   - title
 *   - perPage
 *   - sort
 *   - filter (the permanent filter to apply to the query)
 *   - actions
 *   - filters (a React Element used to display the filter form)
 *   - pagination
 *
 * @example
 *     const PostFilter = (props) => (
 *         <Filter {...props}>
 *             <TextInput label="Search" source="q" alwaysOn />
 *             <TextInput label="Title" source="title" />
 *         </Filter>
 *     );
 *     export const PostList = (props) => (
 *         <List {...props}
 *             title="List of posts"
 *             sort={{ field: 'published_at' }}
 *             filter={{ is_published: true }}
 *             filters={<PostFilter />}
 *         >
 *             <Datagrid>
 *                 <TextField source="id" />
 *                 <TextField source="title" />
 *                 <EditButton />
 *             </Datagrid>
 *         </List>
 *     );
 */
export class ListController extends Component {
    state = {};

    componentDidMount() {
        if (
            !this.props.query.page &&
            !(this.props.ids || []).length &&
            this.props.params.page > 1 &&
            this.props.total > 0
        ) {
            this.setPage(this.props.params.page - 1);
            return;
        }

        this.updateData();
        if (Object.keys(this.props.query).length > 0) {
            this.props.changeListParams(this.props.resource, this.props.query);
        }
    }

    componentWillUnmount() {
        this.setFilters.cancel();
    }

    componentWillReceiveProps(nextProps) {
        if (
            nextProps.resource !== this.props.resource ||
            nextProps.query.sort !== this.props.query.sort ||
            nextProps.query.order !== this.props.query.order ||
            nextProps.query.page !== this.props.query.page ||
            nextProps.query.filter !== this.props.query.filter
        ) {
            this.updateData(
                Object.keys(nextProps.query).length > 0
                    ? nextProps.query
                    : nextProps.params
            );
        }
        if (nextProps.version !== this.props.version) {
            this.updateData();
        }
    }

    shouldComponentUpdate(nextProps, nextState) {
        if (
            nextProps.translate === this.props.translate &&
            nextProps.isLoading === this.props.isLoading &&
            nextProps.version === this.props.version &&
            nextState === this.state &&
            nextProps.data === this.props.data &&
            nextProps.selectedIds === this.props.selectedIds &&
            nextProps.total === this.props.total
        ) {
            return false;
        }
        return true;
    }

    /**
     * Merge list params from 4 different sources:
     *   - the query string
     *   - the params stored in the state (from previous navigation)
     *   - the filter defaultValues
     *   - the props passed to the List component
     */
    getQuery() {
        const query =
            Object.keys(this.props.query).length > 0
                ? this.props.query
                : { ...this.props.params };
        const filterDefaultValues = this.props.filterDefaultValues || {};

        query.filter = { ...filterDefaultValues, ...query.filter };

        if (!query.sort) {
            query.sort = this.props.sort.field;
            query.order = this.props.sort.order;
        }
        if (!query.perPage) {
            query.perPage = this.props.perPage;
        }
        if (!query.page) {
            query.page = 1;
        }
        return query;
    }

    updateData(query) {
        const params = query || this.getQuery();
        const { sort, order, page = 1, perPage, filter } = params;
        const pagination = {
            page: parseInt(page, 10),
            perPage: parseInt(perPage, 10),
        };
        const permanentFilter = this.props.filter;
        this.props.crudGetList(
            this.props.resource,
            pagination,
            { field: sort, order },
            { ...filter, ...permanentFilter }
        );
    }

    setSort = sort => this.changeParams({ type: SET_SORT, payload: sort });

    setPage = page => this.changeParams({ type: SET_PAGE, payload: page });

    setPerPage = perPage =>
        this.changeParams({ type: SET_PER_PAGE, payload: perPage });

    setFilters = debounce(filters => {
        if (isEqual(filters, this.props.filterValues)) {
            return;
        }

        // fix for redux-form bug with onChange and enableReinitialize
        const filtersWithoutEmpty = removeEmpty(filters);
        this.changeParams({ type: SET_FILTER, payload: filtersWithoutEmpty });
    }, this.props.debounce);

    showFilter = (filterName, defaultValue) => {
        this.setState({ [filterName]: true });
        if (typeof defaultValue !== 'undefined') {
            this.setFilters({
                ...this.props.filterValues,
                [filterName]: defaultValue,
            });
        }
    };

    hideFilter = filterName => {
        this.setState({ [filterName]: false });
        const newFilters = removeKey(this.props.filterValues, filterName);
        this.setFilters(newFilters);
    };

    handleSelect = ids => {
        this.props.setSelectedIds(this.props.resource, ids);
    };

    handleUnselectItems = () => {
        this.props.setSelectedIds(this.props.resource, []);
    };

    handleToggleItem = id => {
        this.props.toggleItem(this.props.resource, id);
    };

    changeParams(action) {
        const newParams = queryReducer(this.getQuery(), action);
        this.props.push({
            ...this.props.location,
            search: `?${stringify({
                ...newParams,
                filter: JSON.stringify(newParams.filter),
            })}`,
        });
        this.props.changeListParams(this.props.resource, newParams);
    }

    render() {
        const {
            basePath,
            children,
            resource,
            hasCreate,
            data,
            ids,
            total,
            isLoading,
            translate,
            version,
            selectedIds,
        } = this.props;
        const query = this.getQuery();

        const queryFilterValues = query.filter || {};

        const resourceName = translate(`resources.${resource}.name`, {
            smart_count: 2,
            _: inflection.humanize(inflection.pluralize(resource)),
        });
        const defaultTitle = translate('ra.page.list', {
            name: `${resourceName}`,
        });

        return children({
            basePath,
            currentSort: {
                field: query.sort,
                order: query.order,
            },
            data,
            defaultTitle,
            displayedFilters: this.state,
            filterValues: queryFilterValues,
            hasCreate,
            hideFilter: this.hideFilter,
            ids,
            isLoading,
            onSelect: this.handleSelect,
            onToggleItem: this.handleToggleItem,
            onUnselectItems: this.handleUnselectItems,
            page: parseInt(query.page || 1, 10),
            perPage: parseInt(query.perPage, 10),
            refresh: this.refresh,
            resource,
            selectedIds,
            setFilters: this.setFilters,
            setPage: this.setPage,
            setPerPage: this.setPerPage,
            setSort: this.setSort,
            showFilter: this.showFilter,
            translate,
            total,
            version,
        });
    }
}

ListController.propTypes = {
    // the props you can change
    children: PropTypes.func.isRequired,
    filter: PropTypes.object,
    filters: PropTypes.element,
    filterDefaultValues: PropTypes.object, // eslint-disable-line react/forbid-prop-types
    pagination: PropTypes.element,
    perPage: PropTypes.number.isRequired,
    sort: PropTypes.shape({
        field: PropTypes.string,
        order: PropTypes.string,
    }),
    // the props managed by react-admin
    authProvider: PropTypes.func,
    basePath: PropTypes.string.isRequired,
    changeListParams: PropTypes.func.isRequired,
    crudGetList: PropTypes.func.isRequired,
    data: PropTypes.object, // eslint-disable-line react/forbid-prop-types
    debounce: PropTypes.number,
    filterValues: PropTypes.object, // eslint-disable-line react/forbid-prop-types
    hasCreate: PropTypes.bool.isRequired,
    hasEdit: PropTypes.bool.isRequired,
    hasList: PropTypes.bool.isRequired,
    hasShow: PropTypes.bool.isRequired,
    ids: PropTypes.array,
    selectedIds: PropTypes.array,
    isLoading: PropTypes.bool.isRequired,
    location: PropTypes.object.isRequired,
    path: PropTypes.string,
    params: PropTypes.object.isRequired,
    push: PropTypes.func.isRequired,
    query: PropTypes.object.isRequired,
    resource: PropTypes.string.isRequired,
    setSelectedIds: PropTypes.func.isRequired,
    toggleItem: PropTypes.func.isRequired,
    total: PropTypes.number.isRequired,
    translate: PropTypes.func.isRequired,
    version: PropTypes.number,
};

ListController.defaultProps = {
    debounce: 500,
    filter: {},
    filterValues: {},
    perPage: 10,
    sort: {
        field: 'id',
        order: SORT_DESC,
    },
};

const injectedProps = [
    'basePath',
    'currentSort',
    'data',
    'defaultTitle',
    'displayedFilters',
    'filterValues',
    'hasCreate',
    'hideFilter',
    'ids',
    'isLoading',
    'onSelect',
    'onToggleItem',
    'onUnselectItems',
    'page',
    'perPage',
    'refresh',
    'resource',
    'selectedIds',
    'setFilters',
    'setPage',
    'setPerPage',
    'setSort',
    'showFilter',
    'total',
    'translate',
    'version',
];

/**
 * Select the props injected by the ListController
 * to be passed to the List children need
 * This is an implementation of pick()
 */
export const getListControllerProps = props =>
    injectedProps.reduce((acc, key) => ({ ...acc, [key]: props[key] }), {});

/**
 * Select the props not injected by the ListController
 * to be used inside the List children to sanitize props injected by List
 * This is an implementation of omit()
 */
export const sanitizeListRestProps = props =>
    Object.keys(props)
        .filter(props => !injectedProps.includes(props))
        .reduce((acc, key) => ({ ...acc, [key]: props[key] }), {});

const validQueryParams = ['page', 'perPage', 'sort', 'order', 'filter'];
const getLocationPath = props => props.location.pathname;
const getLocationSearch = props => props.location.search;
const selectQuery = createSelector(
    getLocationPath,
    getLocationSearch,
    (path, search) => {
        const query = pickBy(
            parse(search),
            (v, k) => validQueryParams.indexOf(k) !== -1
        );
        if (query.filter && typeof query.filter === 'string') {
            try {
                query.filter = JSON.parse(query.filter);
            } catch (err) {
                delete query.filter;
            }
        }
        return query;
    }
);

function mapStateToProps(state, props) {
    const resourceState = state.admin.resources[props.resource];

    return {
        query: selectQuery(props),
        params: resourceState.list.params,
        ids: resourceState.list.ids,
        selectedIds: resourceState.list.selectedIds,
        total: resourceState.list.total,
        data: resourceState.data,
        isLoading: state.admin.loading > 0,
        filterValues: resourceState.list.params.filter,
        version: state.admin.ui.viewVersion,
    };
}

export default compose(
    connect(
        mapStateToProps,
        {
            crudGetList: crudGetListAction,
            changeListParams: changeListParamsAction,
            setSelectedIds: setListSelectedIdsAction,
            toggleItem: toggleListItemAction,
            push: pushAction,
        }
    ),
    translate
)(ListController);

Answer 1

使用自定义dataProvider处理此用例会更容易。

每次在列表视图中执行操作（排序，过滤等）时，React Admin都会向数据提供者询问数据。

例如，假设我们要列出用户，然后按性别过滤用户，然后按年龄排序。数据提供者将使用以下参数调用三次：

dataProvider('GET_LIST', 'user', { sort: defaultSort, filters: defaultFilters });
dataProvider('GET_LIST', 'user', { sort: defaultSort, filters: { gender: 'm' } });
dataProvider('GET_LIST', 'user', { sort: { field: 'age', order: 'DESC' }, filters: { gender: 'm' } });

因此，为了实现所需的行为，您的自定义数据提供程序将类似于：

// customDataResolver.js
import simpleRestProvider from 'ra-data-simple-rest';

const restDataProvider = simpleRestDataProvider('http://example.com/api');

let users; // In-memory cache (but you can write in storage or something)

export default (type, resource, params) => {
    if (type === 'GET_LIST' && resource === 'users') {
         if (!users) {
              return restDataProvider(type, resource, params)
                   .then((data) => {
                       users = data;
                       return data;
                   });
         }

         return users
             .sort(sortBy(params.sort))
             .filter(filterBy(params.filter));
    };

    return restDataProvider(type, resource, params);
};

react-admin如何创建客户端列表控制器

1 个答案: