Typeorm how to get relations of relations

by

We can load sub-relations by using 'relation.subrelation' within the relations array itself like this:

relations: ['relation1', 'relation2', 'relation2.subrelation1']

So for your case, instead of using join you can simply do something like this:

this.entityManager.findOne(ChatRoomEntity, {
        where: {id: roomToJoin.id},
        relations: ['activeUsers', 'messages', 'messages.fromUser'],
      }).then(roomEntity => {
...

This is specified here: https://github.com/typeorm/typeorm/blob/master/docs/find-options.md#basic-options

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