{"action":"created","comment":{"url":"https://api.github.com/repos/edx/ecommerce/pulls/comments/30156746","id":30156746,"diff_hunk":"@@ -0,0 +1,65 @@\n+from django.conf import settings\n+from django.db import models\n+from django.utils.translation import ugettext_lazy as _\n+from simple_history.models import HistoricalRecords\n+\n+from ecommerce.extensions.refund.exceptions import InvalidStatus\n+\n+\n+class StatusMixin(object):\n+    pipeline_setting = None\n+\n+    @property\n+    def pipeline(self):\n+        # NOTE: We use the property and getattr (instead of settings.XXX) so that we can properly override the\n+        # settings when testing.\n+        return getattr(settings, self.pipeline_setting)\n+\n+    def available_statuses(self):\n+        \"\"\" Returns all possible statuses that this object can move to. \"\"\"\n+        return self.pipeline.get(self.status, ())\n+\n+    # pylint: disable=access-member-before-definition,attribute-defined-outside-init\n+    def set_status(self, new_status):\n+        \"\"\"\n+        Set a new status for this object.\n+\n+        If the requested status is not valid, then ``InvalidStatus`` is raised.\n+        \"\"\"\n+        if new_status == self.status:\n+            return","path":"ecommerce/extensions/refund/models.py","position":30,"original_position":30,"commit_id":"202cfd8daeed6a81a6c913672652a4c2a12d359d","original_commit_id":"936b1e883d736a7b82033d6bcef1cbd8c44ac145","user":{"login":"jimabramson","id":1349368,"avatar_url":"https://avatars.githubusercontent.com/u/1349368?v=3","gravatar_id":"","url":"https://api.github.com/users/jimabramson","html_url":"https://github.com/jimabramson","followers_url":"https://api.github.com/users/jimabramson/followers","following_url":"https://api.github.com/users/jimabramson/following{/other_user}","gists_url":"https://api.github.com/users/jimabramson/gists{/gist_id}","starred_url":"https://api.github.com/users/jimabramson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jimabramson/subscriptions","organizations_url":"https://api.github.com/users/jimabramson/orgs","repos_url":"https://api.github.com/users/jimabramson/repos","events_url":"https://api.github.com/users/jimabramson/events{/privacy}","received_events_url":"https://api.github.com/users/jimabramson/received_events","type":"User","site_admin":false},"body":"I'm basically with @rlucioni on this - if our model only expects certain state transitions then we should fail loudly when an unexpected transition happens, unless doing so would break oscar somehow.  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It currently includes models representing refunds and associated line items, as well as basic state maintenance.\r\n\r\nXCOM-304\r\n\r\nReplaces #90 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