如何过滤没有数组的标准化嵌套JSON数据？

Question

after use normalizr library I have the following normalized JSON object result in the Redux state of my application:

  { 
    sports: {
        byId: {
          1: {
            id: 1,
            name: 'Soccer',
            slug: 'soccer'
          },
          2: {
            id: 2,
            name: 'Basketball',
            slug: 'basketball'
          },
          3: {
            id: 3,
            name: 'American Football',
            slug: 'american-football'
          }
        },
        allIds: [
          '1',
          '2',
          '3'
        ]
      },
      competitions: {
        byId: {
          '1': {
            id: 1,
            name: 'Competition 1',
            short_name: 'Comp 1',
            slug: 'comp-1',
            sport: 1,
            status: {
             is_live: false 
           }
          },
          '2': {
            id: 2,
            name: 'Competition 2',
            short_name: 'Comp 2',
            slug: 'comp-2',
            sport: 1,
            status: {
             is_live: true 
           }
          },
          '3': {
            id: 3,
            name: 'National Basketball League',
            short_name: 'NBA',
            slug: 'national-basketball-league',
            sport_slug: 'basketball',
            sport: 3,
            status: {
             is_live: true 
           }
          }
        },
        allIds: [
          '1',
          '2',
          '3'
        ]
     }

What I want achieve: I want a list of competitions filtered/categorized by sports .

How can I do that?

Also I want to be able to group competitions by it's status.is_live .

So how can I get an list of competitions breakdown by sport that status.is_live equals true and competitions status.is_live equals false?

Any help is appreciated! Thanks

Answer 1

If you don't want to use lodash , you can write a .groupBy function pretty easily ( example ). You'll need to loop over the output object and reassign its children values with a for instead of using .mapValues .

I used lodash in the example, just to point out the logic.

Note: I'd remove the grouping in the data in the original response, and let the client do this on its own - it's easier to work on an unsorted array and filter/map that instead of working against values from an object that has redundant keys (since they represent groups by Id)

 let data = { sports: { byId: { 1: { id: 1, name: 'Soccer', slug: 'soccer' }, 2: { id: 2, name: 'Basketball', slug: 'basketball' }, 3: { id: 3, name: 'American Football', slug: 'american-football' } }, allIds: [ '1', '2', '3' ] }, competitions: { byId: { '1': { id: 1, name: 'Competition 1', short_name: 'Comp 1', slug: 'comp-1', sport: 1, status: { is_live: false } }, '2': { id: 2, name: 'Competition 2', short_name: 'Comp 2', slug: 'comp-2', sport: 1, status: { is_live: true } }, '3': { id: 3, name: 'National Basketball League', short_name: 'NBA', slug: 'national-basketball-league', sport_slug: 'basketball', sport: 3, status: { is_live: true } } }, allIds: [ '1', '2', '3' ] } } let competitions = Object.values(data.competitions.byId) // _.chain(arr) keeps returning `lodash` objects // so I don't have to call it separately for every action let filteredCompetitions = _.chain(competitions) .groupBy(i => i.status.is_live) .mapValues(i => _.groupBy(i, 'sport')) .value() // returns the final value console.log(filteredCompetitions) 

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