Composite Key Pattern in Firebase

example.ts

  createData() {

    const data = {
      name: 'Crane',
      family: 'bird',
      weight: 10,
      endangered: false,

      // composite keys
      endangered_family: 'false_bird',
      endangered_weight: 'false_10',
      family_weight: 'bird_10',
      endangered_family_weight: 'false_bird_10'
    }

    this.db.list('/animals').push(data)

  }


  getData() {
    this.db.list('/animals', {
      query: {
        orderByChild: 'endangered_family_weight',
        equalTo: 'bird_10_false'
      }
    })
  }