From 65694644c3349b13646958f542ba81ab46800086 Mon Sep 17 00:00:00 2001
From: pofider <honza.pofider@seznam.cz>
Date: Mon, 30 Jan 2023 15:35:05 +0100
Subject: [PATCH] add support to ne

---
 lib/queryTransform.js | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/lib/queryTransform.js b/lib/queryTransform.js
index 6d976cc..5bd159b 100644
--- a/lib/queryTransform.js
+++ b/lib/queryTransform.js
@@ -97,6 +97,21 @@ Node.prototype.transform = function () {
     this._prop(result, this.left, { $gte: this.right.value })
   }
 
+  if (this.type === 'ne' && this.right.type === 'literal') {
+    // odata parser returns ['null', ''] for a filter with "field eq null"
+    // we handle the case by fixing the query in case this happens
+    if (
+      Array.isArray(this.right.value) &&
+      this.right.value.length === 2 &&
+      this.right.value[0] === 'null' &&
+      this.right.value[1] === ''
+    ) {
+      this._prop(result, this.left, { $ne: null })
+    } else {
+      this._prop(result, this.left, { $ne: this.right.value })
+    }
+  }
+
   if (this.type === 'and') {
     result.$and = result.$and || []
     result.$and.push(new Node(this.left.type, this.left.left, this.left.right, this.func, this.args).transform())