[Model] Add set attributes _attrs in HelpScout objects

Author: santiher

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 All notable changes to this project will be documented here.
 
+## [0.2.3] - 2019-07-16
+### Fixed
+- Setting attributes to HelpScout objects adds them to the attributes list.
+
 ## [0.2.2] - 2019-07-12
 ### Fixed
 - Send json data actually as json.

helpscout/__init__.py

@@ -1,4 +1,4 @@
 from helpscout.client import HelpScout  # noqa
 
 
-__version__ = '0.2.2'
+__version__ = '0.2.3'

helpscout/model.py

@@ -71,6 +71,22 @@ def cls(cls, entity_name, key):
         globals()[class_name] = cls = type(class_name, (cls,), {'key': key})
         return cls
 
+    def __setattr__(self, attr, value):
+        """Sets an attribute to an object and adds it to the attributes list.
+
+        Parameters
+        ----------
+        attr: str
+        value: object
+        """
+        if attr == '_attrs':
+            super(HelpScoutObject, self).__setattr__(attr, value)
+        elif attr not in self._attrs:
+            self._attrs = tuple(sorted(self._attrs + (attr,)))
+            super(HelpScoutObject, self).__setattr__(attr, value)
+        else:
+            super(HelpScoutObject, self).__setattr__(attr, value)
+
     def __reduce__(self):
         """For pickling with HelpScoutObject."""
         class_attributes = self.__class__.__name__, self.key