Fix/3678 overloaded query constraints (#3723)

* Added failing test

* Updated test description

* Properly handle equalities with additional operator constraints

* adds continuation to silence rejected promises

* Wrap json parsing

* nits

spec/ParseQuery.spec.js

@@ -1891,6 +1891,41 @@ describe('Parse.Query testing', () => {
     });
   });
 
+  it("equalTo on same column as $dontSelect should not break $dontSelect functionality (#3678)", function(done) {
+    var AuthorObject = Parse.Object.extend("Author");
+    var BlockedObject = Parse.Object.extend("Blocked");
+    var PostObject = Parse.Object.extend("Post");
+
+    var postAuthor = null;
+    var requestUser = null;
+
+    return new AuthorObject({ name: "Julius"}).save().then((user) => {
+      postAuthor = user;
+      return new AuthorObject({ name: "Bob"}).save();
+    }).then((user) => {
+      requestUser = user;
+      var objects = [
+        new PostObject({ author: postAuthor, title: "Lorem ipsum" }),
+        new PostObject({ author: requestUser, title: "Kafka" }),
+        new PostObject({ author: requestUser, title: "Brown fox" }),
+        new BlockedObject({ blockedBy: postAuthor, blockedUser: requestUser})
+      ];
+      return Parse.Object.saveAll(objects);
+    }).then(() => {
+      var banListQuery = new Parse.Query(BlockedObject);
+      banListQuery.equalTo("blockedUser", requestUser);
+
+      return new Parse.Query(PostObject)
+        .equalTo("author", postAuthor)
+        .doesNotMatchKeyInQuery("author", "blockedBy", banListQuery)
+        .find()
+        .then((r) => {
+          expect(r.length).toEqual(0);
+          done();
+        }, done.fail);
+    })
+  });
+
   it("object with length", function(done) {
     var TestObject = Parse.Object.extend("TestObject");
     var obj = new TestObject();

src/RestQuery.js

@@ -169,6 +169,8 @@ RestQuery.prototype.buildRestWhere = function() {
     return this.replaceInQuery();
   }).then(() => {
     return this.replaceNotInQuery();
+  }).then(() => {
+    return this.replaceEquality();
   });
 }
 
@@ -438,6 +440,39 @@ const cleanResultAuthData = function (result) {
   }
 };
 
+const replaceEqualityConstraint = (constraint) => {
+  if (typeof constraint !== 'object') {
+    return constraint;
+  }
+  const equalToObject = {};
+  let hasDirectConstraint = false;
+  let hasOperatorConstraint = false;
+  for (const key in constraint) {
+    if (key.indexOf('$') !== 0) {
+      hasDirectConstraint = true;
+      equalToObject[key] = constraint[key];
+    } else {
+      hasOperatorConstraint = true;
+    }
+  }
+  if (hasDirectConstraint && hasOperatorConstraint) {
+    constraint['$eq'] = equalToObject;
+    Object.keys(equalToObject).forEach((key) => {
+      delete constraint[key];
+    });
+  }
+  return constraint;
+}
+
+RestQuery.prototype.replaceEquality = function() {
+  if (typeof this.restWhere !== 'object') {
+    return;
+  }
+  for (const key in this.restWhere) {
+    this.restWhere[key] = replaceEqualityConstraint(this.restWhere[key]);
+  }
+}
+
 // Returns a promise for whether it was successful.
 // Populates this.response with an object that only has 'results'.
 RestQuery.prototype.runFind = function(options = {}) {