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javascript - Firebase -- Bulk delete child nodes

I am building a simple todo app using reactFire, Firebase, and reactJS. The problem I am running into is when I try to bulk delete completed entries in the list.

componentWillMount: function() {
        this.ref = Firebase.database().ref("items/");
        this.bindAsArray(this.ref, "items");
        this.ref.on('value', this.handleDataLoaded);
}

for (var i in this.state.items) {
            var key = items[i]['.key'];
            if(items[i].done){
                this.ref.child(key).remove();
            }
}

The loop ends prematurely i.e. before deleting all the completed entries, because the render function is called.

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