Redux Selector用于规范化状态

问题描述 投票:2回答:2

我需要帮助创建状态选择器,根据redux docs的文档规范化

{
    "entities": {
        "people": {
            "byId": {
                "1": {
                    "name": "Test User 1",
                    "classes": ["class1", "class2"],
                    "isSelected": true
                },
                "2": {
                    "name": "Test User 2",
                    "classes": ["class2", "class3"],
                    "isSelected": false
                },
                "3": {
                    "name": "Test User 3",
                    "classes": ["class4"],
                    "isSelected": false
                }
            },
            "allIds": ["1", "2", "3"]
        },
        "classes": {
            "byId": {
                "class1": {
                    "name": "Class 1",
                    "courses": ["course1", "course2"]
                },
                "class2": {
                    "name": "Class 2",
                    "courses": ["course2"]
                },
                "class3": {
                    "name": "Class 3",
                    "courses": ["course1", "course3"]
                }
            },
            "allIds": ["class1", "class2", "class3"]
        },
        "courses": {
            "byId": {
                "course1": {
                    "name": "Course 1"
                },
                "course2": {
                    "name": "Course 2"
                },
                "course3": {
                    "name": "Course 3"
                }
            },
            "allIds": ["course1", "course2", "course3"]
        }
    }
}

在每个人的个人资料中,我想显示相关的课程和课程。我无法创建选择器来访问此信息。

人民选择

import { createSelector } from 'reselect';

const getPeopleDetails = createSelector(
    state => state.entities.people,
    (people) => people.allIds.reduce(
        (acc, cV) => {  
            if(people.byId[cV].isSelected) acc.push(people.byId[cV]); return acc; 
        }, [])
);

export default {
    getPeopleDetails
}

由于createSelector不接受任何参数。对于我在courses州的切片;如何创建选择器以获取当前所选人员的个人资料的信息?

我应该创建一个联结表来描述实体之间的关系吗?

(我很反应/ redux)

reactjs redux selector reselect
2个回答
0
投票

你的选择器可以采取道具和状态。然后你可以将它用作选择器的参数:

const getPerson = (state, props) =>
  state.entities.people.byId[props.id];

const getPersonDetails = createSelector(
  getPerson,
  state => state.entities.classes,
  (person, classes) => {
    // loop through classes, etc..
    // return whatever
  }
);

0
投票

我通过创建另一个名为ui的状态切片来解决这个问题。在该切片中,我管理选定的对象ID。

当特定组件的选定Id中存在值时,将呈现组件。每个组件都有一个if条件,它检查ui切片是否填充了所选的ID。

React Design

例如,

{
    "ui": {
        "personSelectedId": ["1"],
        "classSelectedId": ["class1", "class2"],
        "courseSelectedId": ["course1", "course2"],
    }
}

希望这是有道理的。

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