I have the following input as an example of clubs that includes a property players which is an array of objects.
const clubs = [
{
id: 5,
name: 'Club Name',
creatorId: 10,
players: [
{
userId: 2, // group by this property
name: 'Player name 1',
clubId: 5,
},
{
userId: 7, // group by this property
name: 'Player name 2',
clubId: 5,
},
],
},
{
id: 6,
name: 'Club Name 2',
creatorId: 2,
players: [
{
userId: 7, // group by this property
name: 'Player name 3',
clubId: 6,
},
{
userId: 8, // group by this property
name: 'Player name 4',
clubId: 6,
},
{
userId: 22, // group by this property
name: 'Player name 5',
clubId: 6,
},
],
},
];
I want to groupBy each of the player.userIds of each club and should have a value of the club for each player, to have the following output.
{
'2': [{ id: 5, name: 'Club Name', creatorId: 10, players: [Array] }],
'7': [
{ id: 5, name: 'Club Name', creatorId: 10, players: [Array] },
{ id: 6, name: 'Club Name 2', creatorId: 2, players: [Array] },
],
'8': [{ id: 6, name: 'Club Name 2', creatorId: 2, players: [Array] }],
'22': [{ id: 6, name: 'Club Name 2', creatorId: 2, players: [Array] }],
};
I have tried
const byPlayer = allClubs.reduce((b, a) => {
a.players.forEach((player) => {
const id = player.clubId;
const clubsByPlayer = b[id] || (b[id] = []);
clubsByPlayer.push(a);
});
return b;
}, {});
But it returned the group by the clubId and a value of each player in the club
{
'5': [
{ id: 5, name: 'Club Name', creatorId: 10, players: [Array] },
{ id: 5, name: 'Club Name', creatorId: 10, players: [Array] },
],
'6': [
{ id: 6, name: 'Club Name 2', creatorId: 2, players: [Array] },
{ id: 6, name: 'Club Name 2', creatorId: 2, players: [Array] },
{ id: 6, name: 'Club Name 2', creatorId: 2, players: [Array] },
],
};
Replace
const id = player.clubId;
with
const id = player.userId;
const
clubs = [{ id: 5, name: 'Club Name', creatorId: 10, players: [{ userId: 2, name: 'Player name 1', clubId: 5 }, { userId: 7, name: 'Player name 2', clubId: 5 }] }, { id: 6, name: 'Club Name 2', creatorId: 2, players: [{ userId: 7, name: 'Player name 3', clubId: 6 }, { userId: 8, name: 'Player name 4', clubId: 6 }, { userId: 22, name: 'Player name 5', clubId: 6 }] }],
byPlayer = clubs.reduce((b, a) => {
a.players.forEach((player) => {
(b[player.userId] ??= []).push(a);
});
return b;
}, {});
console.log(byPlayer).as-console-wrapper { max-height: 100% !important; top: 0; }