From a97d2e5764cc1e3f2678942c682399aba2b55159 Mon Sep 17 00:00:00 2001
From: johnlim <johnlim.dingwei@gmail.com>
Date: Tue, 25 Oct 2016 17:45:48 +0800
Subject: [PATCH] Should allow an equalTo query with a 'null' value so that the
 client is able to query for data that does not have a specific key.

---
 firebase-query.html      | 14 +++++++++-----
 test/firebase-query.html | 15 +++++++++++++++
 2 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/firebase-query.html b/firebase-query.html
index 2edaf32..beef1cd 100644
--- a/firebase-query.html
+++ b/firebase-query.html
@@ -69,7 +69,7 @@
            */
           query: {
             type: Object,
-            computed: '__computeQuery(ref, orderByChild, orderByValue, limitToFirst, limitToLast, startAt, endAt, equalTo)',
+            computed: '__computeQuery(ref, orderByChild, orderByValue, limitToFirst, limitToLast, startAt, endAt, equalTo, equalToNull)',
             observer: '__queryChanged'
           },
 
@@ -127,7 +127,11 @@
             type: Object,
             value: null
           },
-
+          equalToNull: {
+            type: Boolean,
+            reflectToAttribute: true,
+            value: false
+          },
           /**
            * The maximum number of nodes to include in the query.
            *
@@ -240,7 +244,7 @@
           }
         },
 
-        __computeQuery: function(ref, orderByChild, orderByValue, limitToFirst, limitToLast, startAt, endAt, equalTo) {
+        __computeQuery: function(ref, orderByChild, orderByValue, limitToFirst, limitToLast, startAt, endAt, equalTo, equalToNull) {
           if (ref == null) {
             return null;
           }
@@ -269,7 +273,7 @@
             query = query.endAt(endAt);
           }
 
-          if (equalTo !== null) {
+          if (equalTo !== null || equalToNull) {
             query = query.equalTo(equalTo);
           }
 
@@ -375,7 +379,7 @@
           var targetIndex = previousChildKey ? this.__indexFromKey(previousChildKey) : 0;
 
           this._log('Firebase child_moved:', key, value,
-              'to index', targetIndex);
+                  'to index', targetIndex);
 
           if (value) {
             var index = this.__indexFromKey(key);
diff --git a/test/firebase-query.html b/test/firebase-query.html
index d946ff0..ca81347 100644
--- a/test/firebase-query.html
+++ b/test/firebase-query.html
@@ -280,6 +280,21 @@
             expect(query.data.length).to.be.eql(2);
           });
         });
+
+        test('should allow an equalTo query with a `null` value to enable query for data without a specific key', function() {
+          query.orderByChild = 'thing';
+          query.equalTo = null;
+          query.equalToNull = true;
+
+          return setFirebaseValue(query.path, {
+            a: {thing: true},
+            b: {thing: false},
+            c: {nothing: false}
+          }).then(function() {
+            expect(query.data[0].$key).to.be.eql('c');
+            expect(query.data.length).to.be.eql(1);
+          });
+        });
       });
 
       suite('instance isolation', function() {