Make notEqual work on relations

* ⚡ regression tests for #1349

* 🎉 fixes #1349

* Adds support for multiple constraints on the same key

src/Controllers/DatabaseController.js

@@ -444,26 +444,60 @@ DatabaseController.prototype.reduceInRelation = function(className, query, schem
   }
 
   let promises = Object.keys(query).map((key) => {
-    if (query[key] && (query[key]['$in'] || query[key].__type == 'Pointer')) {
+    if (query[key] && (query[key]['$in'] || query[key]['$ne'] || query[key]['$nin'] || query[key].__type == 'Pointer')) {
       let t = schema.getExpectedType(className, key);
       let match = t ? t.match(/^relation<(.*)>$/) : false;
       if (!match) {
         return Promise.resolve(query);
       }
       let relatedClassName = match[1];
-      let relatedIds;
-      if (query[key]['$in']) {
-        relatedIds = query[key]['$in'].map(r => r.objectId);
-      } else {
-        relatedIds = [query[key].objectId];
-      }
-      return this.owningIds(className, key, relatedIds).then((ids) => {
-        delete query[key];
-        this.addInObjectIdsIds(ids, query);
-        return Promise.resolve(query);
+      // Build the list of queries
+      let queries = Object.keys(query[key]).map((constraintKey) => {
+        let relatedIds;
+        let isNegation = false;
+        if (constraintKey === 'objectId') {
+          relatedIds = [query[key].objectId];
+        } else if (constraintKey == '$in') {
+          relatedIds = query[key]['$in'].map(r => r.objectId);
+        } else if (constraintKey == '$nin') {
+          isNegation = true;
+          relatedIds = query[key]['$nin'].map(r => r.objectId);
+        } else if (constraintKey == '$ne') {
+          isNegation = true;
+          relatedIds = [query[key]['$ne'].objectId];
+        } else {
+          return;
+        }
+        return {
+          isNegation,
+          relatedIds
+        }
       });
+
+      // remove the current queryKey as we don,t need it anymore
+      delete query[key];
+      // execute each query independnently to build the list of
+      // $in / $nin
+      let promises = queries.map((q) => {
+        if (!q) {
+          return Promise.resolve();
+        }
+        return this.owningIds(className, key, q.relatedIds).then((ids) => {
+          if (q.isNegation) {
+            this.addNotInObjectIdsIds(ids, query);
+          } else {
+            this.addInObjectIdsIds(ids, query);
+          }
+          return Promise.resolve();
+        });
+      });
+
+      return Promise.all(promises).then(() => {
+        return Promise.resolve();
+      })
+
     }
-    return Promise.resolve(query);
+    return Promise.resolve();
   })
 
   return Promise.all(promises).then(() => {
@@ -520,6 +554,29 @@ DatabaseController.prototype.addInObjectIdsIds = function(ids = null, query) {
   return query;
 }
 
+DatabaseController.prototype.addNotInObjectIdsIds = function(ids = null, query) {
+  let idsFromNin = query.objectId && query.objectId['$nin'] ? query.objectId['$nin'] : null;
+  let allIds = [idsFromNin, ids].filter(list => list !== null);
+  let totalLength = allIds.reduce((memo, list) => memo + list.length, 0);
+
+  let idsIntersection = [];
+  if (totalLength > 125) {
+    idsIntersection = intersect.big(allIds);
+  } else {
+    idsIntersection = intersect(allIds);
+  }
+
+  // Need to make sure we don't clobber existing $lt or other constraints on objectId.
+  // Clobbering $eq, $in and shorthand $eq (query.objectId === 'string') constraints
+  // is expected though.
+  if (!('objectId' in query) || typeof query.objectId === 'string') {
+    query.objectId = {};
+  }
+  query.objectId['$nin'] = idsIntersection;
+
+  return query;
+}
+
 // Runs a query on the database.
 // Returns a promise that resolves to a list of items.
 // Options: