diff --git a/lib/abstract-class.js b/lib/abstract-class.js
index 65392c4b..ecd39cf4 100644
--- a/lib/abstract-class.js
+++ b/lib/abstract-class.js
@@ -729,17 +729,23 @@ AbstractClass.belongsTo = function (anotherClass, params) {
         }.bind(this));
     };
 
-    this.prototype[methodName] = function (p) {
+    this.prototype[methodName] = function (refresh, p) {
+        if (arguments.length === 1) {
+            p = refresh;
+            refresh = false;
+        } else if (arguments.length > 2) {
+            throw new Error('Method only can\'t be only called with more than two arguments');
+        }
         var self = this;
-        var cachedValue = null;
-        if (this.__cachedRelations && this.__cachedRelations[methodName]) {
+        var cachedValue;
+        if (!refresh && this.__cachedRelations && (typeof this.__cachedRelations[methodName] !== 'undefined')) {
             cachedValue = this.__cachedRelations[methodName];
         }
         if (p instanceof AbstractClass) { // acts as setter
             this[fk] = p.id;
             this.__cachedRelations[methodName] = p;
         } else if (typeof p === 'function') { // acts as async getter
-            if (cachedValue === null) {
+            if (typeof cachedValue === 'undefined') {
                 this.__finders__[methodName](this[fk], function(err, inst) {
                     if (!err) {
                         self.__cachedRelations[methodName] = inst;
@@ -752,10 +758,10 @@ AbstractClass.belongsTo = function (anotherClass, params) {
                 return cachedValue;
             }
         } else if (typeof p === 'undefined') { // acts as sync getter
-            return cachedValue || this[fk];
+            return this[fk];
         } else { // setter
             this[fk] = p;
-            this.__cachedRelations[methodName] = p;
+            delete this.__cachedRelations[methodName];
         }
     };
 
@@ -793,6 +799,7 @@ function defineScope(cls, targetClass, name, params, methods) {
             var f = function caller(condOrRefresh, cb) {
                 var actualCond = {};
                 var actualRefresh = false;
+                var saveOnCache = true;
                 if (arguments.length === 1) {
                     cb = condOrRefresh;
                 } else if (arguments.length === 2) {
@@ -800,23 +807,23 @@ function defineScope(cls, targetClass, name, params, methods) {
                         actualRefresh = condOrRefresh;
                     } else {
                         actualCond = condOrRefresh;
+                        actualRefresh = true;
+                        saveOnCache = false;
                     }
-                } else if (arguments.length > 2) {
-                    throw new Error('Method only can\'t be called with more than two arguments');
+                } else {
+                    throw new Error('Method only can be only called with one or two arguments');
                 }
 
-                if (!this.__cachedRelations || !this.__cachedRelations[name] || actualRefresh) {
+                if (!this.__cachedRelations || (typeof this.__cachedRelations[name] == 'undefined') || actualRefresh) {
                     var self = this;
                     return targetClass.all(mergeParams(actualCond, caller._scope), function(err, data) {
-                        self.__cachedRelations[name] = data;
+                        if (!err && saveOnCache) {
+                            self.__cachedRelations[name] = data;
+                        }
                         cb(err, data);
                     });
                 } else {
-                    if (cb) {
-                        cb(null, this.__cachedRelations);
-                    } else {
-                        return this.__cachedRelations[name];
-                    }
+                    cb(null, this.__cachedRelations[name]);
                 }
             };
             f._scope = typeof params === 'function' ? params.call(this) : params;