Firebase Web Update() Deletes All Other Child Nodes

Hello everyone I am getting weird behaviour here. I try to update one specific child node, when the user clicks a button. Here is my code: var updates2 = {}; var offer = { minus

Solution 1:

What is actually happening in your code is the folowing:

You are writing entirely to the key thereby wiping off the whole properties in your dataset.

this

updates2['/offer/' + keyReal] = offer;

wipes out the whole data in that particular key.

Try this instead:

firebase.database().ref('offer/' + keyReal).update({
    minusAccandShare: 2,
  });

this allows you to make sure you change the specified property in your firebase dataset.

I hope this helped

Solution 2:

Seems like you should read up on firebase refs. You don't seem to be updating the ref so you're updating (presumably) the root DB object (I have never passed a blank ref to Firebase so I'm not 100% sure what the behavior is of using firebase.database().ref().

I've "compiled" your code so you we can see what you're passing to the empty ref:

var updates2 = {};

updates2['/offerLight/' + keyReal] = offer;
updates2['/offer/' + keyReal] = offer;

// Becomes...

updates2 = {
  '/offerLight/jifdjsiavdas': {
    minusAccandShare: 2
  },
  '/offer/jifdjsiavdas': {
    minusAccandShare: 2
  }
}

// So...return firebase.database().ref().update( updates2 );

// is sent asreturn firebase.database().ref().update({
  '/offerLight/jifdjsiavdas': {
    minusAccandShare: 2
  },
  '/offer/jifdjsiavdas': {
    minusAccandShare: 2
  }
})

It seems like what you actually want to be doing is referencing the child node jifdjsiavdas. You'll want to point to it with a reference like this:

firebase.database.ref( 'offer/' + keyReal ).update( offer );