code: function offValue(dbRef) {
  		var storageKey = getStorageKeyFromDbRef(dbRef, 'value');
  
  		//Turn listener off.
  		dbRef.off();
  
  		return new Promise(function (resolve, reject) {
  			if (storageKey in snapPeak) {
  				var dataToCache = snapPeak[storageKey];
  				delete snapPeak[storageKey];
  				resolve(_reactNative.AsyncStorage.setItem(storageKey, dataToCache));
  			} else {
  				resolve(null);
  			}
  		});
  	}
docs: Remove any listeners from the specified ref, and save any existing data to the cache.
  @param {firebase.database.Reference} dbRef Firebase database reference to clear.
  @returns {Promise} Promis that will resolve after listener is switched off and cache has been written.