diff --git a/common/models.py b/common/models.py
new file mode 100644
index 0000000000..2a8992554d
--- /dev/null
+++ b/common/models.py
@@ -0,0 +1,131 @@
+from utils import *
+
+
+class Model(object):
+
+    accessible_fields = ['id']
+    updatable_fields = ['id']
+    initializable_fields = ['id']
+    base_url = None
+    default_retrieve_params = {}
+
+    DEFAULT_ACTIONS_WITH_ID = ['get', 'put', 'delete']
+    DEFAULT_ACTIONS_WITHOUT_ID = ['get_all', 'post']
+    DEFAULT_ACTIONS = DEFAULT_ACTIONS_WITH_ID + DEFAULT_ACTIONS_WITHOUT_ID
+
+    def __init__(self, *args, **kwargs):
+        self.attributes = extract(kwargs, self.accessible_fields)
+        self.retrieved = False
+
+    def __getattr__(self, name):
+        if name == 'id':
+            return self.attributes.get('id', None)
+        try:
+            return self.attributes[name]
+        except KeyError:
+            if self.retrieved or self.id is None:
+                raise AttributeError("Field {0} does not exist".format(name))
+            self.retrieve()
+            return self.__getattr__(name)
+
+    def __setattr__(self, name, value):
+        if name == 'attributes' or name not in self.accessible_fields:
+            super(Model, self).__setattr__(name, value)
+        else:
+            self.attributes[name] = value
+
+    def __getitem__(self, key):
+        if key not in self.accessible_fields:
+            raise KeyError("Field {0} does not exist".format(key))
+        return self.attributes.get(key)
+
+    def __setitem__(self, key, value):
+        if key not in self.accessible_fields:
+            raise KeyError("Field {0} does not exist".format(key))
+        self.attributes.__setitem__(key, value)
+
+    def items(self, *args, **kwargs):
+        return self.attributes.items(*args, **kwargs)
+
+    def get(self, *args, **kwargs):
+        return self.attributes.get(*args, **kwargs)
+
+    def to_dict(self):
+        self.retrieve()
+        return self.attributes
+
+    def retrieve(self, *args, **kwargs):
+        if not self.retrieved:
+            self._retrieve(*args, **kwargs)
+            self.retrieved = True
+        return self
+
+    def _retrieve(self, *args, **kwargs):
+        url = self.url(action='get', params=self.attributes)
+        response = perform_request('get', url, self.default_retrieve_params)
+        self.update_attributes(**response)
+
+    @classmethod
+    def find(cls, id):
+        return cls(id=id)
+
+    def update_attributes(self, *args, **kwargs):
+        for k, v in kwargs.items():
+            if k in self.accessible_fields:
+                self.__setattr__(k, v)
+            else:
+                raise AttributeError("Field {0} does not exist".format(k))
+
+    def updatable_attributes(self):
+        return extract(self.attributes, self.updatable_fields)
+
+    def initializable_attributes(self):
+        return extract(self.attributes, self.initializable_fields)
+
+    @classmethod
+    def before_save(cls, instance):
+        pass
+
+    @classmethod
+    def after_save(cls, instance):
+        pass
+
+    def save(self):
+        self.__class__.before_save(self)
+        if self.id:   # if we have id already, treat this as an update
+            url = self.url(action='put', params=self.attributes)
+            response = perform_request('put', url, self.updatable_attributes())
+        else:   # otherwise, treat this as an insert
+            url = self.url(action='post', params=self.attributes)
+            response = perform_request('post', url, self.initializable_attributes())
+        self.retrieved = True
+        self.update_attributes(**response)
+        self.__class__.after_save(self)
+
+    def delete(self):
+        url = self.url(action='delete', params=self.attributes)
+        response = perform_request('delete', url)
+        self.retrieved = True
+        self.update_attributes(**response)
+
+    @classmethod
+    def url_with_id(cls, params={}):
+        return cls.base_url + '/' + str(params['id'])
+
+    @classmethod
+    def url_without_id(cls, params={}):
+        return cls.base_url
+
+    @classmethod
+    def url(cls, action, params={}):
+        if cls.base_url is None:
+            raise CommentClientError("Must provide base_url when using default url function")
+        if action not in cls.DEFAULT_ACTIONS:
+            raise ValueError("Invalid action {0}. The supported action must be in {1}".format(action, str(cls.DEFAULT_ACTIONS)))
+        elif action in cls.DEFAULT_ACTIONS_WITH_ID:
+            try:
+                return cls.url_with_id(params)
+            except KeyError:
+                raise CommentClientError("Cannot perform action {0} without id".format(action))
+        else:   # action must be in DEFAULT_ACTIONS_WITHOUT_ID now
+            return cls.url_without_id()
diff --git a/lms/lib/comment_client/models.py b/lms/lib/comment_client/models.py
new file mode 100644
index 0000000000..bf5f576a44
--- /dev/null
+++ b/lms/lib/comment_client/models.py
@@ -0,0 +1,131 @@
+from .utils import *
+
+
+class Model(object):
+
+    accessible_fields = ['id']
+    updatable_fields = ['id']
+    initializable_fields = ['id']
+    base_url = None
+    default_retrieve_params = {}
+
+    DEFAULT_ACTIONS_WITH_ID = ['get', 'put', 'delete']
+    DEFAULT_ACTIONS_WITHOUT_ID = ['get_all', 'post']
+    DEFAULT_ACTIONS = DEFAULT_ACTIONS_WITH_ID + DEFAULT_ACTIONS_WITHOUT_ID
+
+    def __init__(self, *args, **kwargs):
+        self.attributes = extract(kwargs, self.accessible_fields)
+        self.retrieved = False
+
+    def __getattr__(self, name):
+        if name == 'id':
+            return self.attributes.get('id', None)
+        try:
+            return self.attributes[name]
+        except KeyError:
+            if self.retrieved or self.id is None:
+                raise AttributeError("Field {0} does not exist".format(name))
+            self.retrieve()
+            return self.__getattr__(name)
+
+    def __setattr__(self, name, value):
+        if name == 'attributes' or name not in self.accessible_fields:
+            super(Model, self).__setattr__(name, value)
+        else:
+            self.attributes[name] = value
+
+    def __getitem__(self, key):
+        if key not in self.accessible_fields:
+            raise KeyError("Field {0} does not exist".format(key))
+        return self.attributes.get(key)
+
+    def __setitem__(self, key, value):
+        if key not in self.accessible_fields:
+            raise KeyError("Field {0} does not exist".format(key))
+        self.attributes.__setitem__(key, value)
+
+    def items(self, *args, **kwargs):
+        return self.attributes.items(*args, **kwargs)
+
+    def get(self, *args, **kwargs):
+        return self.attributes.get(*args, **kwargs)
+
+    def to_dict(self):
+        self.retrieve()
+        return self.attributes
+
+    def retrieve(self, *args, **kwargs):
+        if not self.retrieved:
+            self._retrieve(*args, **kwargs)
+            self.retrieved = True
+        return self
+
+    def _retrieve(self, *args, **kwargs):
+        url = self.url(action='get', params=self.attributes)
+        response = perform_request('get', url, self.default_retrieve_params)
+        self.update_attributes(**response)
+
+    @classmethod
+    def find(cls, id):
+        return cls(id=id)
+
+    def update_attributes(self, *args, **kwargs):
+        for k, v in kwargs.items():
+            if k in self.accessible_fields:
+                self.__setattr__(k, v)
+            else:
+                raise AttributeError("Field {0} does not exist".format(k))
+
+    def updatable_attributes(self):
+        return extract(self.attributes, self.updatable_fields)
+
+    def initializable_attributes(self):
+        return extract(self.attributes, self.initializable_fields)
+
+    @classmethod
+    def before_save(cls, instance):
+        pass
+
+    @classmethod
+    def after_save(cls, instance):
+        pass
+
+    def save(self):
+        self.__class__.before_save(self)
+        if self.id:   # if we have id already, treat this as an update
+            url = self.url(action='put', params=self.attributes)
+            response = perform_request('put', url, self.updatable_attributes())
+        else:   # otherwise, treat this as an insert
+            url = self.url(action='post', params=self.attributes)
+            response = perform_request('post', url, self.initializable_attributes())
+        self.retrieved = True
+        self.update_attributes(**response)
+        self.__class__.after_save(self)
+
+    def delete(self):
+        url = self.url(action='delete', params=self.attributes)
+        response = perform_request('delete', url)
+        self.retrieved = True
+        self.update_attributes(**response)
+
+    @classmethod
+    def url_with_id(cls, params={}):
+        return cls.base_url + '/' + str(params['id'])
+
+    @classmethod
+    def url_without_id(cls, params={}):
+        return cls.base_url
+
+    @classmethod
+    def url(cls, action, params={}):
+        if cls.base_url is None:
+            raise CommentClientError("Must provide base_url when using default url function")
+        if action not in cls.DEFAULT_ACTIONS:
+            raise ValueError("Invalid action {0}. The supported action must be in {1}".format(action, str(cls.DEFAULT_ACTIONS)))
+        elif action in cls.DEFAULT_ACTIONS_WITH_ID:
+            try:
+                return cls.url_with_id(params)
+            except KeyError:
+                raise CommentClientError("Cannot perform action {0} without id".format(action))
+        else:   # action must be in DEFAULT_ACTIONS_WITHOUT_ID now
+            return cls.url_without_id()