From 5a23c962d2d2c8a4ef3f30a3b0965039808924e8 Mon Sep 17 00:00:00 2001
From: Mario Orlicky <orlickymario@gmail.com>
Date: Sun, 13 Nov 2016 20:38:14 +0100
Subject: Filtering logic by empty labels/members

---
 client/lib/filter.js | 27 ++++++++++++++++++++++++---
 1 file changed, 24 insertions(+), 3 deletions(-)

diff --git a/client/lib/filter.js b/client/lib/filter.js
index 74305284..656f5fe2 100644
--- a/client/lib/filter.js
+++ b/client/lib/filter.js
@@ -61,7 +61,18 @@ class SetFilter {
 
   _getMongoSelector() {
     this._dep.depend();
-    return { $in: this._selectedElements };
+    return { $in: this._selectedElements }
+  }
+
+  _getEmptySelector() {
+    this._dep.depend();
+    let includeEmpty = false
+    this._selectedElements.forEach((el) => {
+      if (el == undefined) {
+        includeEmpty = true;
+      }
+    });
+    return includeEmpty ? { $eq: [] } : null;
   }
 }
 
@@ -95,16 +106,26 @@ Filter = {
       return {};
 
     const filterSelector = {};
+    const emptySelector = {};
+    let includeEmptySelectors = false;
     this._fields.forEach((fieldName) => {
       const filter = this[fieldName];
-      if (filter._isActive())
+      if (filter._isActive()) {
         filterSelector[fieldName] = filter._getMongoSelector();
+        emptySelector[fieldName] = filter._getEmptySelector();
+        if (emptySelector[fieldName] != null) {
+          includeEmptySelectors = true;
+        }
+      }
     });
 
     const exceptionsSelector = {_id: {$in: this._exceptions}};
     this._exceptionsDep.depend();
 
-    return {$or: [filterSelector, exceptionsSelector]};
+    if (includeEmptySelectors)
+      return {$or: [filterSelector, exceptionsSelector, emptySelector]};
+    else
+      return {$or: [filterSelector, exceptionsSelector]};
   },
 
   mongoSelector(additionalSelector) {
-- 
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