Add to Realm List only if doesn't exist

Question

I am trying to create a TV Series schema with a list of available Seasons (using RealmJS), I would like to not add duplicate season numbers to the Seasons[] list.

This is what I have:

TvSeries.schema = {
  name: 'TvSeries',
  primaryKey: 'mediaId',
  properties: {
    mediaId: 'string',
    seasons: 'Seasons[]'
  }
}

Seasons.schema = {
  name: 'Seasons',
  primaryKey: 'seasonNumber',
  properties: {
    seasonNumber: 'int'
  }
}

realm.write(() => {
  let season = realm.create('Seasons', { seasonNumber: seasonNumber }, true)
  let tvShow = realm.create('TvSeries', mediaObject, true)
  let seasonsList = tvShow.seasons
  seasonsList.push(season)
})

When I add a new episode (not shown here), it will add the TV Series data and Season again and as there are multiple episodes in a season, it will add to the Seasons[] list multiple times.

My thoughts would be to go through the Seasons[] list and check if it exists, if not then push a new season to it.

Is there a better way of doing this?

Answer 1

I would just do a quick check to see if the list already contains the season before inserting:

realm.write(() => {
    let season = realm.create('Seasons', { seasonNumber: seasonNumber }, true)
    let tvShow = realm.create('TvSeries', mediaObject, true)
    let seasonsList = tvShow.seasons
    if (seasonsList.filtered("seasonNumber == $0", season.seasonNumber).length == 0) {
        seasonsList.push(season)
    }
})