diff --git a/lib/scope.js b/lib/scope.js
index 8b90432c..c51f00fd 100644
--- a/lib/scope.js
+++ b/lib/scope.js
@@ -59,6 +59,9 @@ function defineScope(cls, targetClass, name, params, methods) {
                     var self = this;
                     return targetClass.all(mergeParams(actualCond, caller._scope), function(err, data) {
                         if (!err && saveOnCache) {
+                            if (!self.__cachedRelations) {
+                                self.__cachedRelations = {};
+                            }
                             self.__cachedRelations[name] = data;
                         }
                         cb(err, data);
diff --git a/test/scope.test.js b/test/scope.test.js
new file mode 100644
index 00000000..352133b1
--- /dev/null
+++ b/test/scope.test.js
@@ -0,0 +1,65 @@
+// This test written in mocha+should.js
+var should = require('./init.js');
+
+var db, Railway, Station;
+
+describe('sc0pe', function() {
+    before(function() {
+        db = getSchema();
+        Railway = db.define('Railway', {
+            URID: {type: String, index: true}
+        });
+        Station = db.define('Station', {
+            USID: {type: String, index: true},
+            capacity: {type: Number, index: true},
+            thoughput: {type: Number, index: true},
+            isActive: {type: Boolean, index: true},
+            isUndeground: {type: Boolean, index: true}
+        });
+
+    });
+
+    beforeEach(function(done) {
+        Railway.destroyAll(function() {
+            Station.destroyAll(done);
+        });
+    });
+
+    it('should define scope with query', function(done) {
+        Station.scope('active', {where: {isActive: true}});
+
+        Station.active.create(function(err, station) {
+            should.not.exist(err);
+            should.exist(station);
+            should.exist(station.isActive);
+            station.isActive.should.be.true;
+            done();
+        });
+    });
+
+    it('should allow scope chaining', function(done) {
+        Station.scope('active', {where: {isActive: true}});
+        Station.scope('subway', {where: {isUndeground: true}});
+        Station.active.subway.create(function(err, station) {
+            should.not.exist(err);
+            should.exist(station);
+            station.isActive.should.be.true;
+            station.isUndeground.should.be.true;
+            done();
+        })
+    });
+
+    it('should query all', function(done) {
+        Station.scope('active', {where: {isActive: true}});
+        Station.scope('inactive', {where: {isActive: false}});
+        Station.scope('ground', {where: {isUndeground: true}});
+        Station.active.ground.create(function() {
+            Station.inactive.ground.create(function() {
+                Station.ground.inactive(function(err, ss) {
+                    ss.should.have.lengthOf(1);
+                    done();
+                });
+            });
+        });
+    });
+});