diff --git a/spec/ParseQuery.spec.js b/spec/ParseQuery.spec.js
index f5b6dc1a2b..9171d12cbb 100644
--- a/spec/ParseQuery.spec.js
+++ b/spec/ParseQuery.spec.js
@@ -2088,4 +2088,60 @@ describe('Parse.Query testing', () => {
       console.log(error);
     });
   });
+  
+  // #371
+  it('should properly interpret a query', (done) => {
+    var query = new Parse.Query("C1");
+    var auxQuery = new Parse.Query("C1");
+    query.matchesKeyInQuery("A1", "A2", auxQuery);
+    query.include("A3");
+    query.include("A2");
+    query.find().then((result) => {
+      done();
+    }, (err) => {
+      console.error(err);
+      fail("should not failt");
+      done();
+    })
+  });
+  
+  it('should properly interpret a query', (done) => {
+    var user = new Parse.User();
+    user.set("username", "foo");
+    user.set("password", "bar");
+    return user.save().then( (user) => {
+      var objIdQuery = new Parse.Query("_User").equalTo("objectId", user.id);
+      var blockedUserQuery = user.relation("blockedUsers").query();
+      
+      var aResponseQuery = new Parse.Query("MatchRelationshipActivityResponse");
+      aResponseQuery.equalTo("userA", user);
+      aResponseQuery.equalTo("userAResponse", 1);
+      
+      var bResponseQuery = new Parse.Query("MatchRelationshipActivityResponse");
+      bResponseQuery.equalTo("userB", user);
+      bResponseQuery.equalTo("userBResponse", 1);
+      
+      var matchOr = Parse.Query.or(aResponseQuery, bResponseQuery);
+      var matchRelationshipA = new Parse.Query("_User");
+      matchRelationshipA.matchesKeyInQuery("objectId", "userAObjectId", matchOr);
+      var matchRelationshipB = new Parse.Query("_User");
+      matchRelationshipB.matchesKeyInQuery("objectId", "userBObjectId", matchOr);
+      
+      
+      var orQuery = Parse.Query.or(objIdQuery, blockedUserQuery, matchRelationshipA, matchRelationshipB);
+      var query = new Parse.Query("_User");
+      query.doesNotMatchQuery("objectId", orQuery);
+      return query.find();
+    }).then((res) => {
+      done();
+      done();
+    }, (err) => {
+      console.error(err);
+      fail("should not fail");
+      done();
+    });
+    
+    
+  });
+  
 });
diff --git a/spec/ParseRelation.spec.js b/spec/ParseRelation.spec.js
index a3fbe82ce5..e1416ecb6e 100644
--- a/spec/ParseRelation.spec.js
+++ b/spec/ParseRelation.spec.js
@@ -291,6 +291,44 @@ describe('Parse.Relation testing', () => {
     });
   });
   
+  it("query on pointer and relation fields with equal", (done) => {
+    var ChildObject = Parse.Object.extend("ChildObject");
+    var childObjects = [];
+    for (var i = 0; i < 10; i++) {
+      childObjects.push(new ChildObject({x: i}));
+    }
+
+    Parse.Object.saveAll(childObjects).then(() => {
+        var ParentObject = Parse.Object.extend("ParentObject");
+        var parent = new ParentObject();
+        parent.set("x", 4);
+        var relation = parent.relation("toChilds");
+        relation.add(childObjects[0]);
+        relation.add(childObjects[1]);
+        relation.add(childObjects[2]);
+        
+        var parent2 = new ParentObject();
+        parent2.set("x", 3);
+        parent2.set("toChild", childObjects[2]);
+        
+        var parents = [];
+        parents.push(parent);
+        parents.push(parent2);
+        parents.push(new ParentObject());
+        
+       return Parse.Object.saveAll(parents).then(() => {
+          var query = new Parse.Query(ParentObject);
+          query.equalTo("objectId", parent.id);
+          query.equalTo("toChilds", childObjects[2]);
+         
+          return query.find().then((list) => {
+            equal(list.length, 1, "There should be 1 result");
+            done();
+          });
+        });
+    });
+  });
+  
   it("or queries on pointer and relation fields", (done) => {
     var ChildObject = Parse.Object.extend("ChildObject");
     var childObjects = [];
@@ -335,6 +373,7 @@ describe('Parse.Relation testing', () => {
     });
   });
 
+
   it("Get query on relation using un-fetched parent object", (done) => {
     // Setup data model
     var Wheel = Parse.Object.extend('Wheel');
diff --git a/src/Controllers/DatabaseController.js b/src/Controllers/DatabaseController.js
index ec0fb1f69c..683b9be053 100644
--- a/src/Controllers/DatabaseController.js
+++ b/src/Controllers/DatabaseController.js
@@ -417,9 +417,8 @@ DatabaseController.prototype.reduceInRelation = function(className, query, schem
         relatedIds = [query[key].objectId];
       }
       return this.owningIds(className, key, relatedIds).then((ids) => {
-        delete query[key];
-        query.objectId = Object.assign({'$in': []}, query.objectId);
-        query.objectId['$in'] = query.objectId['$in'].concat(ids);
+        delete query[key]; 
+        this.addInObjectIdsIds(ids, query);
         return Promise.resolve(query);
       });
     }
@@ -448,15 +447,23 @@ DatabaseController.prototype.reduceRelationKeys = function(className, query) {
       relatedTo.key,
       relatedTo.object.objectId).then((ids) => {
         delete query['$relatedTo'];
-        query.objectId = query.objectId || {};
-        let queryIn = query.objectId['$in'] || [];
-        queryIn = queryIn.concat(ids);
-        query['objectId'] = {'$in': queryIn};
+        this.addInObjectIdsIds(ids, query);
         return this.reduceRelationKeys(className, query);
       });
   }
 };
 
+DatabaseController.prototype.addInObjectIdsIds = function(ids, query) {
+  if (typeof query.objectId == 'string') {
+    query.objectId = {'$in': [query.objectId]};
+  }
+   query.objectId = query.objectId || {};
+   let queryIn =  [].concat(query.objectId['$in'] || [], ids || []);
+   // make a set and spread to remove duplicates
+   query.objectId = {'$in': [...new Set(queryIn)]};
+   return query;
+}
+
 // Runs a query on the database.
 // Returns a promise that resolves to a list of items.
 // Options:
diff --git a/src/RestQuery.js b/src/RestQuery.js
index e68ec16f31..5cd2df52cb 100644
--- a/src/RestQuery.js
+++ b/src/RestQuery.js
@@ -271,11 +271,11 @@ RestQuery.prototype.replaceSelect = function() {
 
   // The select value must have precisely two keys - query and key
   var selectValue = selectObject['$select'];
+  // iOS SDK don't send where if not set, let it pass
   if (!selectValue.query ||
       !selectValue.key ||
       typeof selectValue.query !== 'object' ||
       !selectValue.query.className ||
-      !selectValue.query.where ||
       Object.keys(selectValue).length !== 2) {
     throw new Parse.Error(Parse.Error.INVALID_QUERY,
                           'improper usage of $select');