Mapping associations with no join included

[lfreneda]

What If a want to group some properties on a nested object.

Here's a sample:

resultMaps = [
      {
        mapId: 'teamMap',
        idProperty: 'id',
        properties: ['name'],
        associations: [
          { name: 'players', mapId: 'playerMap', columnPrefix: 'player_' }
        ]
      },
      {
        mapId: 'playerMap',
        properties: ['name']
      }
    ]

    resultSet = [
      { team_id: 1, team_name: 'New England Patriots', player_name: 'Tom Brady' }
    ];

    mappedResult = joinjs.map(resultSet, resultMaps, 'teamMap', 'team_');

    expect(mappedResult).to.deep.equal [
      {
        id: 1
        name: 'New England Patriots'
        player: {
          name: 'Tom Brady'
        }
      }
    ]

Is this possible?

[FerrielMelarpis]

probably create custom property for that using createNew

[FerrielMelarpis]

@lfreneda actually disregard my comment above.
The most likely solution for this would be to use player_name as idProperty of playerMap. There would be no problem with doing that if player_name is a unique column and assuming that this is a one-to-one relationship since you are asking about associations, not collections.

    resultMaps = [
      {
        mapId: 'teamMap',
        idProperty: 'id',
        properties: ['name'],
        associations: [ // use collections for one-to-many
          { name: 'players', mapId: 'playerMap', columnPrefix: 'player_' }
        ]
      },
      {
        mapId: 'playerMap',
        idProperty: ['name']
      }
    ];

However, with regards to the PR title:

Mapping associations with no join included

I think that that is not the scope of this library. Associations are basically the way to map relationships in result sets. join-js is agnostic of your data relationships that is why you are the one to teach it how to read your data.