reactjs - 规范化状态的 Redux 选择器

Question

我需要帮助为基于来自 redux docs 的文档规范化的状态创建选择器

状态

{
    "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上，我想显示相关的类(class)和类(class)。我无法创建选择器来访问此信息。

人物选择器

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
}

因为 createSelector 不接受任何参数。对于我的 courses 状态切片；如何创建一个选择器，从中获取当前选定人员个人资料的信息？

我应该创建一个联结表来描述实体之间的关系吗？

(我对 react/redux 很陌生)

Answer 1

你的选择器可以接受 props 和 state。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
  }
);