use post_load to deserialise object

tracim/models/context_models.py

 from tracim.models.auth import Profile
 
 
+class LoginCredentials(object):
+    """
+    Login credentials model for login
+    """
+
+    def __init__(self, email: str, password: str):
+        self.email = email
+        self.password = password
+
+
 class UserInContext(object):
     """
     Interface to get User data and User data related to context.

tracim/views/core_api/schemas.py

 # coding=utf-8
 import marshmallow
+from marshmallow import post_load
+
+from tracim.models.context_models import LoginCredentials, UserInContext
 
 
 class ProfileSchema(marshmallow.Schema):
 
 
 class UserSchema(marshmallow.Schema):
+
     user_id = marshmallow.fields.Int(dump_only=True)
     email = marshmallow.fields.Email(required=True)
     display_name = marshmallow.fields.String()
 
 
 class BasicAuthSchema(marshmallow.Schema):
+
     email = marshmallow.fields.Email(required=True)
     password = marshmallow.fields.String(required=True, load_only=True)
 
+    @post_load
+    def make_login(self, data):
+        return LoginCredentials(**data)
+
 
 class LoginOutputHeaders(marshmallow.Schema):
     expire_after = marshmallow.fields.String()

tracim/views/core_api/session_controller.py

         """
         Logs user into the system
         """
-        email = request.json_body['email']
-        password = request.json_body['password']
+
+        login = hapic_data.body
         app_config = request.registry.settings['CFG']
         uapi = UserApi(
             None,
             session=request.dbsession,
             config=app_config,
         )
-        return uapi.authenticate_user(email, password)
+        return uapi.authenticate_user(login.email, login.password)
 
     @hapic.with_api_doc()
     @hapic.output_body(NoContentSchema(), default_http_code=HTTPStatus.NO_CONTENT)  # nopep8