[Vuejs]-How to establish the relation between two different trees in the root of the database using IDs?

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this seem to be the most practical method:

Tying the users node to the buildings:

Template:

    <p>Name: <input type="text" v-model="newBuilding.name"></p>
    <p>Address: <input type="text" v-model="newBuilding.address"></p>

Data:

data () {
    return {
      newBuilding: {
        name: '',
        address: '',
        ownerID: '',
      }
    }
  },

Methods:

addBuilding: function () {

    // get current user from firebase
      let userId = firebase.auth().currentUser.uid; 

    // create a random pushkey but without pushing it yet
      let buildingKey = buildingsRef.push().key 

    // set the user.uid as building data child "ownerId" value, (the other data nodes where hydrated from the <template>
      this.newBuilding.ownerID = userId; 

    // SET THE NEW BUILDING 
      buildingsRef.child(buildingKey).set(this.newBuilding); 

      // SET THE BUILDING PUCHKEY ON A CHILD NODE ON THE **USERS** NODE
  usersRef.child(userId).child('isAdmin').child(buildingKey).set(true);

}

I hope this does it for you.

Follow more questions on this topic here:

What is the best practice to write the rules of Firebase in a situation like this?

Is it possible to define a variable on the firebase database references path?

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