Firebase update() - exclude fields

Question

I have a class which I'm saving to Firebase using update().

Is it possible to prevent certain fields (known by name) of the object being saved, from being saved to firebase db?

Think like transient in java.

I mean without using JS delete operator.

Frank van Puffelen · Accepted Answer · 2017-07-23 03:52:31Z

6

When you call update(), Firebase will change the value of each property (or path) that you've specific in the object you pass in. If you don't want a specific property to be used, don't pass it in.

If you have an existing object and you want a copy that excludes a few fields:

clone a js object except for one key

Or:

var obj = { a: 1, b: 2, c: 3, d: 4, e: { f: 5 } }
var updates = {};
Object.keys(obj).forEach((key) => {
  if (key !== "c") updates[key] = obj[key];
});
ref.update(updates);

answered Jul 23, 2017 at 3:52

Frank van Puffelen

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2 Comments

KarolDepka Over a year ago

Thanks. Upvoted. Is there something like "filter"/"mutator" functions that could be applied when "serializing" to Firebase? That would a useful feature.

Jay Over a year ago

@KarolDepka If this answer helped, please accept it instead of upvoting so it can help others as well.

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