[Vuejs]-Querying and mutating firebase realtime database many to many (two way) relationships

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You have to use the update() method which allows writing “multiple values to the Database at once” (see also here):

Here is an example on how you would do for the first case (“how do I not only add him to the players object, but also to the team_memberships object”). 

var userObj = {
    firstName: payload.firstName,
    lastName: payload.lastName,
    jerseyNumber: payload.jerseyNumber,
    teamName: payload.teamName
};

var team_id = '....'  //I don't know how you plan to get this value.

var newPlayerKey = firebase.database().ref('users').child(user.uid).child('players').push().key;

var updates = {};
updates['/users/' + user.uid + '/players/' + newPlayerKey] = userObj;
updates['/users/' + user.uid + '/team_memberships/' + team_id + '/' + newPlayerKey] = true;

return firebase.database().ref().update(updates);

Note: I don’t know how you plan to get the value of team_id but most probably from the front end, since you have the teamName.

👤Renaud Tarnec

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