Make notEqual work on relations

* ⚡ regression tests for #1349

* 🎉 fixes #1349

* Adds support for multiple constraints on the same key

spec/ParseQuery.spec.js

@@ -23,6 +23,105 @@ describe('Parse.Query testing', () => {
     });
   });
 
+  it("notEqualTo with Relation is working", function(done) {
+    var user = new Parse.User();
+    user.setPassword("asdf");
+    user.setUsername("zxcv");
+
+    var user1 = new Parse.User();
+    user1.setPassword("asdf");
+    user1.setUsername("qwerty");
+
+    var user2 = new Parse.User();
+    user2.setPassword("asdf");
+    user2.setUsername("asdf");
+
+    var Cake = Parse.Object.extend("Cake");
+    var cake1 = new Cake();
+    var cake2 = new Cake();
+    var cake3 = new Cake();
+
+
+    user.signUp().then(function(){
+      return user1.signUp();
+    }).then(function(){
+      return user2.signUp();
+    }).then(function(){
+      var relLike1 = cake1.relation("liker");
+      relLike1.add([user, user1]);
+
+      var relDislike1 = cake1.relation("hater");
+      relDislike1.add(user2);
+      return cake1.save();
+    }).then(function(){
+      var rellike2 = cake2.relation("liker");
+      rellike2.add([user, user1]);
+
+      var relDislike2 = cake2.relation("hater");
+      relDislike2.add(user2);
+
+      return cake2.save();
+    }).then(function(){
+      var rellike3 = cake3.relation("liker");
+      rellike3.add(user);
+
+      var relDislike3 = cake3.relation("hater");
+      relDislike3.add([user1, user2]);
+      return cake3.save();
+    }).then(function(){
+      var query = new Parse.Query(Cake);
+      // User2 likes nothing so we should receive 0
+      query.equalTo("liker", user2);
+      return query.find().then(function(results){
+        equal(results.length, 0);
+      });
+    }).then(function(){
+      var query = new Parse.Query(Cake);
+      // User1 likes two of three cakes
+      query.equalTo("liker", user1);
+      return query.find().then(function(results){
+        // It should return 2 -> cake 1 and cake 2
+        equal(results.length, 2);
+      });
+    }).then(function(){
+      var query = new Parse.Query(Cake);
+      // We want to know which cake the user1 is not appreciating -> cake3
+      query.notEqualTo("liker", user1);
+      return query.find().then(function(results){
+        // Should return 1 -> the cake 3
+        equal(results.length, 1);
+      });
+    }).then(function(){
+      var query = new Parse.Query(Cake);
+      // User2 is a hater of everything so we should receive 0
+      query.notEqualTo("hater", user2);
+      return query.find().then(function(results){
+        equal(results.length, 0);
+      });
+    }).then(function(){
+      var query = new Parse.Query(Cake);
+      // Only cake3 is liked by user
+      query.notContainedIn("liker", [user1]);
+      return query.find().then(function(results){
+        equal(results.length, 1);
+      });
+    }).then(function(){
+      var query = new Parse.Query(Cake);
+      // All the users
+      query.containedIn("liker", [user, user1, user2]);
+      // Exclude user 1
+      query.notEqualTo("liker", user1);
+      // Only cake3 is liked only by user1
+      return query.find().then(function(results){
+        equal(results.length, 1);
+        let cake = results[0];
+        expect(cake.id).toBe(cake3.id);
+      });
+    }).then(function(){
+      done();
+    })
+  });
+
   it("query with limit", function(done) {
     var baz = new TestObject({ foo: 'baz' });
     var qux = new TestObject({ foo: 'qux' });

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: