fix: Prevent query->equalTo from overriding other conditions (#510)

Author: dplewis

src/Parse/ParseQuery.php

@@ -140,7 +140,7 @@ public function get($objectId, $useMasterKey = false)
      */
     public function equalTo($key, $value)
     {
-        $this->where[$key] = $value;
+        $this->addCondition($key, '$eq', $value);
 
         return $this;
     }

tests/Parse/ParseQueryTest.php

@@ -2663,7 +2663,9 @@ public function testGetAndSetConditions()
 
         $this->assertEquals([
             'where' => [
-                'key'   => 'value',
+                'key'   => [
+                    '$eq' => 'value',
+                ],
                 'key2'  => [
                     '$ne'   => 'value2',
                 ],
@@ -2719,4 +2721,57 @@ public function testUnknownCondition()
             'unrecognized'  => 1
         ]);
     }
+
+    /**
+     * @group query-equalTo-conditions
+     */
+    public function testEqualToWithSameKeyDoesNotOverrideOtherConditions()
+    {
+        $baz = new ParseObject('TestObject');
+        $baz->setArray('fooStack', [
+            [
+                'status' => 'baz'
+            ],
+            [
+                'status' => 'bar'
+            ]
+        ]);
+        $baz->save();
+
+        $bar = new ParseObject('TestObject');
+        $bar->setArray('fooStack', [
+            [
+                'status' => 'bar'
+            ]
+        ]);
+        $bar->save();
+
+        $qux = new ParseObject('TestObject');
+        $qux->setArray('fooStack', [
+            [
+                'status' => 'bar',
+            ],
+            [
+                'status' => 'qux'
+            ]
+        ]);
+        $qux->save();
+
+        $query = new ParseQuery('TestObject');
+        $query->notEqualTo('fooStack.status', 'baz');
+        $query->equalTo('fooStack.status', 'bar');
+
+        $this->assertEquals(2, $query->count(true));
+
+        $this->assertSame([
+            'where' => [
+                'fooStack.status'   => [
+                    '$ne'   => 'baz',
+                    '$eq' => 'bar',
+                ]
+            ],
+            'limit' => 0,
+            'count' => 1,
+        ], $query->_getOptions());
+    }
 }