diff --git a/lib/Model.js b/lib/Model.js
index db218e6..fbc25f4 100644
--- a/lib/Model.js
+++ b/lib/Model.js
@@ -91,16 +91,15 @@ Model.prototype.find = function (conditions, callback) {
 	if (!_.isPlainObject(conditions)) conditions = { _id: conditions };
 
 	// Handle any renames
-	for(var upstream in $.options.renames) {
-		var downstream = $.options.renames[upstream];
-
-		conditions[upstream] = conditions[upstream] || conditions[downstream];
-				
-		if(conditions[upstream] === undefined)
-			delete conditions[upstream];
+	for(var upstream in this.options.renames) {
+		var downstream = this.options.renames[upstream];
 
-		if(conditions[downstream] !== undefined)
+		if(conditions.hasOwnProperty(upstream)) {
+			if(conditions.hasOwnProperty(downstream)) delete conditions[downstream];
+		} else if(conditions.hasOwnProperty(downstream)) {
+			conditions[upstream] = conditions[downstream];
 			delete conditions[downstream];
+		}
 	}
 
 	transform.up(this.options.transforms, conditions);
@@ -137,16 +136,15 @@ Model.prototype.findOne = Model.prototype.get = function (conditions, callback)
 	if (!_.isPlainObject(conditions)) conditions = { _id: conditions };
 
 	// Handle any renames
-	for(var upstream in $.options.renames) {
-		var downstream = $.options.renames[upstream];
-
-		conditions[upstream] = conditions[upstream] || conditions[downstream];
-				
-		if(conditions[upstream] === undefined)
-			delete conditions[upstream];
+	for(var upstream in this.options.renames) {
+		var downstream = this.options.renames[upstream];
 
-		if(conditions[downstream] !== undefined)
+		if(conditions.hasOwnProperty(upstream)) {
+			if(conditions.hasOwnProperty(downstream)) delete conditions[downstream];
+		} else if(conditions.hasOwnProperty(downstream)) {
+			conditions[upstream] = conditions[downstream];
 			delete conditions[downstream];
+		}
 	}
 
 	transform.up(this.options.transforms, conditions);
@@ -226,13 +224,12 @@ Model.prototype.insert = Model.prototype.create = function (object, callback) {
 			for(var upstream in $.options.renames) {
 				var downstream = $.options.renames[upstream];
 
-				obj[upstream] = obj[upstream] || obj[downstream];
-				
-				if(obj[upstream] === undefined)
-					delete obj[upstream];
-
-				if(obj[downstream] !== undefined)
+				if(obj.hasOwnProperty(upstream)) {
+					if(obj.hasOwnProperty(downstream)) delete obj[downstream];
+				} else if(obj.hasOwnProperty(downstream)) {
+					obj[upstream] = obj[downstream];
 					delete obj[downstream];
+				}
 			}
 
 			// Transform the object
@@ -274,13 +271,12 @@ Model.prototype.update = function (conditions, changes, callback) {
 	for(var upstream in this.options.renames) {
 		var downstream = this.options.renames[upstream];
 
-		conditions[upstream] = conditions[upstream] || conditions[downstream];
-		
-		if(conditions[upstream] === undefined)
-			delete conditions[upstream];
-
-		if(conditions[downstream] !== undefined)
+		if(conditions.hasOwnProperty(upstream)) {
+			if(conditions.hasOwnProperty(downstream)) delete conditions[downstream];
+		} else if(conditions.hasOwnProperty(downstream)) {
+			conditions[upstream] = conditions[downstream];
 			delete conditions[downstream];
+		}
 	}
 
 	transform.up(this.options.transforms, conditions);
@@ -308,13 +304,12 @@ Model.prototype.count = function (conditions, callback) {
 	for(var upstream in this.options.renames) {
 		var downstream = this.options.renames[upstream];
 
-		conditions[upstream] = conditions[upstream] || conditions[downstream];
-		
-		if(conditions[upstream] === undefined)
-			delete conditions[upstream];
-
-		if(conditions[downstream] !== undefined)
+		if(conditions.hasOwnProperty(upstream)) {
+			if(conditions.hasOwnProperty(downstream)) delete conditions[downstream];
+		} else if(conditions.hasOwnProperty(downstream)) {
+			conditions[upstream] = conditions[downstream];
 			delete conditions[downstream];
+		}
 	}
 
 	transform.up(this.options.transforms, conditions);
@@ -349,13 +344,12 @@ Model.prototype.remove = function (conditions, callback) {
 	for(var upstream in this.options.renames) {
 		var downstream = this.options.renames[upstream];
 
-		conditions[upstream] = conditions[upstream] || conditions[downstream];
-		
-		if(conditions[upstream] === undefined)
-			delete conditions[upstream];
-
-		if(conditions[downstream] !== undefined)
+		if(conditions.hasOwnProperty(upstream)) {
+			if(conditions.hasOwnProperty(downstream)) delete conditions[downstream];
+		} else if(conditions.hasOwnProperty(downstream)) {
+			conditions[upstream] = conditions[downstream];
 			delete conditions[downstream];
+		}
 	}
 
 	transform.up(this.options.transforms, conditions);
diff --git a/lib/utils/transforms.js b/lib/utils/transforms.js
index 6f4b74e..0454492 100644
--- a/lib/utils/transforms.js
+++ b/lib/utils/transforms.js
@@ -17,8 +17,8 @@ function transform(transforms, method, properties) {
 		if (transforms[k] && transforms[k][method]) {
 			// Have a direct transform to apply
 			var newValue = transforms[k][method](properties[k]);
-			if(newValue === undefined && properties[k] !== undefined) delete properties[k];
-			else if(newValue !== undefined) properties[k] = newValue;
+			if(newValue === undefined) delete properties[k];
+			else properties[k] = newValue;
 		} else if (transforms[k]) {
 			// Have a nested transformation to apply
 			transform(transforms[k], method, properties[k]);
diff --git a/package.json b/package.json
index d9d7308..6f0bfb8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "iridium",
-	"version": "1.3.7",
+	"version": "1.3.8",
 	"author": "Benjamin Pannell <admin@sierrasoftworks.com>",
 	"description": "A custom lightweight ORM for MongoDB designed for power-users",
 	"homepage": "https://sierrasoftworks.com/iridium",
diff --git a/test/model.js b/test/model.js
index 2ba29b9..be50491 100644
--- a/test/model.js
+++ b/test/model.js
@@ -35,7 +35,7 @@ describe('orm', function () {
 
 			before(function(done) {
 				model =  new Model(db, 'model', {
-					name: String
+					name: /.+/
 				}, {
 					renames: {
 						_id: 'name'