diff --git a/.gitignore b/.gitignore
index 0df43ff..e02d796 100644
--- a/.gitignore
+++ b/.gitignore
@@ -37,4 +37,4 @@ nosetests.xml
 # Virtualenv folders
 local
 include
-test-project/testproject/test-project.sqlite
+*.sqlite
diff --git a/README.md b/README.md
index 4bcbdb9..9502f93 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@ sqlalchemy-datatables [![Build Status](https://travis-ci.org/Pegase745/sqlalchem
 =====================
 
 ## Usage
-The package is available on [PyPI] (https://pypi.python.org/pypi/sqlalchemy-datatables/0.1.0)
+The package is available on [PyPI] (https://pypi.python.org/pypi/sqlalchemy-datatables/0.1.2)
 
 > pip install sqlalchemy-datatables
 
@@ -96,15 +96,30 @@ def simple_example(request):
 $ git clone 
 $ virtualenv --no-site-packages sqlalchemy-datatables
 $ cd sqlalchemy-datatables/
-$ cd test-project/
-$ $venv/bin/python setup.py develop
-
 Once only: 
-$ $venv/bin/python sqlalchemy-datatables/setup.py develop
+$ bin/python setup.py develop
 
+$ cd test-project/
+$ $venv/bin/python setup.py develop
+$ $venv/bin/initialize_test-project_db development.ini
 $ $venv/bin/pserve development.ini
+
+Open a web browser and got to the url localhost:6543
 ```
 
+## Changelog
+
+#### v0.1.2 (13/08/2013)####
+- Fixing errors due to relationships (filtering, sorting)
+- Setting filter default value to str, avoiding JSON serializable type errors
+
+#### v0.1.1 (12/08/2013)####
+- Fixing viewing column relationships
+
+#### v0.1.0 (12/08/2013)####
+- First version
+
+
 ## License
 
 Copyright (c) 2013 Michel Nemnom
diff --git a/datatables/__init__.py b/datatables/__init__.py
index 196dea9..e67961e 100644
--- a/datatables/__init__.py
+++ b/datatables/__init__.py
@@ -1,4 +1,4 @@
 # -*- coding: utf-8 -*-
-__VERSION__ = '0.1.1'
+__VERSION__ = '0.1.2'
 
-from datatables import *
\ No newline at end of file
+from datatables import *
diff --git a/datatables/datatables.py b/datatables/datatables.py
index 81dfed3..e94da99 100644
--- a/datatables/datatables.py
+++ b/datatables/datatables.py
@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 from sqlalchemy.sql.expression import asc, desc
 from sqlalchemy.sql import or_
+from sqlalchemy.orm.properties import RelationshipProperty
 
 from collections import namedtuple
 
@@ -29,8 +30,10 @@ class ColumnDT(ColumnTuple):
 
     :returns: a ColumnDT object 
     """
-    def __new__(cls, column_name, mData=None, filter=None):
-        """On creation, sets default None values for mData and filter
+    def __new__(cls, column_name, mData=None, filter=str):
+        """
+        On creation, sets default None values for mData and string value for
+        filter (cause: Object representation is not JSON serializable)
         """
         return super(ColumnDT, cls).__new__(cls, column_name, mData, filter)
 
@@ -121,7 +124,20 @@ def filtering(self):
 
         if search_value:
             for col in self.columns:
-                conditions.append(getattr(self.sqla_object, col.column_name).like("%" + search_value + "%"))
+                tmp_column_name = col.column_name.split('.')
+                obj = getattr(self.sqla_object, tmp_column_name[0])
+                if isinstance(obj.property, RelationshipProperty): # Ex: ForeignKey
+                    # Ex: address.description
+                    sqla_obj = obj.mapper.class_
+                    column_name = "".join(tmp_column_name[1:])
+                    if not column_name:
+                        # find first primary key
+                        column_name = obj.property.table.primary_key.columns \
+                            .values()[0].name
+                else:
+                    sqla_obj = self.sqla_object
+                    column_name = col.column_name
+                conditions.append(get_attr(sqla_obj, column_name).like("%" + search_value + "%"))
 
             condition = or_(*conditions)
             self.query = self.query.filter(condition)
@@ -147,7 +163,20 @@ def sorting(self):
                         self.request_values['sSortDir_'+str(i)]))
 
         for sort in sorting:
-            sort_name = self.sqla_object.__tablename__ + '.' + sort.name
+            tmp_sort_name = sort.name.split('.')
+            obj = getattr(self.sqla_object, tmp_sort_name[0])
+            if isinstance(obj.property, RelationshipProperty): # Ex: ForeignKey
+                 # Ex: address.description => description => addresses.description
+                sort_name = "".join(tmp_sort_name[1:])
+                if not sort_name:
+                    # Find first piramry key
+                    sort_name = obj.property.table.primary_key.columns \
+                            .values()[0].name
+                tablename = obj.property.table.name
+            else: #-> ColumnProperty
+                sort_name = sort.name
+                tablename = self.sqla_object.__tablename__
+            sort_name = "%s.%s" % (tablename, sort_name)
             self.query = self.query.order_by(
                 asc(sort_name) if sort.dir == 'asc' else desc(sort_name))
 
@@ -163,4 +192,4 @@ def paging(self):
             pages.length = int(self.request_values['iDisplayLength'])
 
         offset = pages.start + pages.length
-        self.query = self.query.slice(pages.start, offset)
\ No newline at end of file
+        self.query = self.query.slice(pages.start, offset)
diff --git a/test-project/testproject/models.py b/test-project/testproject/models.py
index 14aec8f..16813dc 100644
--- a/test-project/testproject/models.py
+++ b/test-project/testproject/models.py
@@ -32,6 +32,12 @@ class User(Base):
     def __init__(self, name):
         self.name = name
 
+    def __str__(self):
+        return u"%s" % self.name
+
+    def __repr__(self):
+        return '<%s#%s>' % (self.__class__.__name__, self.id)
+
 
 class Address(Base):
     __tablename__ = 'addresses'
@@ -42,5 +48,8 @@ class Address(Base):
     def __init__(self, description):
         self.description = description
 
+    def __str__(self):
+        return "%s" % (self.id)
+
     def __repr__(self):
-        pass
+        return '<%s#%s>' % (self.__class__.__name__, self.id)
diff --git a/test-project/testproject/scripts/initializedb.py b/test-project/testproject/scripts/initializedb.py
index 8a786f4..bf7374b 100644
--- a/test-project/testproject/scripts/initializedb.py
+++ b/test-project/testproject/scripts/initializedb.py
@@ -37,9 +37,9 @@ def main(argv=sys.argv):
     with transaction.manager:
         i = 0
         while i < 30:
-            address = Address(description='Address#' + str(i))
+            address = Address(description='Address#2' + str(i).rjust(2, "0"))
             DBSession.add(address)
-            user = User(name='User#' + str(i))
+            user = User(name='User#1' + str(i).rjust(2, "0"))
             user.address = address
             DBSession.add(user)
             sleep(1)
diff --git a/test-project/testproject/views.py b/test-project/testproject/views.py
index b1e387a..f2e0134 100644
--- a/test-project/testproject/views.py
+++ b/test-project/testproject/views.py
@@ -53,7 +53,7 @@ def simple_example(request):
     columns.append(ColumnDT('id'))
     columns.append(ColumnDT('name', None, _upper))
     columns.append(ColumnDT('address.description'))
-    columns.append(ColumnDT('created_at', None , str))
+    columns.append(ColumnDT('created_at'))
 
     # defining the initial query depending on your purpose
     query = DBSession.query(User).join(Address).filter(Address.id > 14)
@@ -67,4 +67,4 @@ def simple_example(request):
 
 @view_config(route_name='relation_example', request_method='GET', renderer='json')
 def relation_example(request):
-    pass
\ No newline at end of file
+    pass