From c9635159b1302f190725a64254e2454d670c8473 Mon Sep 17 00:00:00 2001
From: Alejandro Alonso <alejandro.alonso@kaleidos.net>
Date: Mon, 1 Apr 2013 21:08:34 +0200
Subject: [PATCH] Adding support in the API for issue history

---
 greenmine/scrum/serializers.py | 38 ++++++++++++++++++++++++++++------
 1 file changed, 32 insertions(+), 6 deletions(-)

diff --git a/greenmine/scrum/serializers.py b/greenmine/scrum/serializers.py
index 95008644..8b5d83a5 100644
--- a/greenmine/scrum/serializers.py
+++ b/greenmine/scrum/serializers.py
@@ -3,7 +3,7 @@ from rest_framework import serializers
 from greenmine.scrum.models import *
 from picklefield.fields import dbsafe_encode, dbsafe_decode
 
-import json
+import json, reversion
 
 class PickleField(serializers.WritableField):
     """
@@ -74,18 +74,44 @@ class TaskSerializer(serializers.ModelSerializer):
 
 class IssueSerializer(serializers.ModelSerializer):
     tags = PickleField()
+    history = serializers.SerializerMethodField('get_history')
 
     class Meta:
         model = Issue
         fields = ()
 
+    def get_issues_diff(self, old_issue_version, new_issue_version):
+        old_obj = old_issue_version.field_dict
+        new_obj = new_issue_version.field_dict
+        diff_dict = {'modified_date':new_obj['modified_date']}
 
-class IssueSerializer(serializers.ModelSerializer):
-    tags = PickleField()
+        for key in old_obj.keys():
+            if key == 'modified_date':
+                continue
 
-    class Meta:
-        model = Issue
-        fields = ()
+            if old_obj[key] == new_obj[key]:
+                continue
+
+            diff_dict[key] = {
+                'old': old_obj[key],
+                'new': new_obj[key],
+            }
+
+        return diff_dict
+
+    def get_history(self, obj):
+        #TODO: add comments info
+        diff_list = []
+        current = None
+
+        for version in reversed(list(reversion.get_for_object(obj))):
+            if current:
+                issues_diff = self.get_issues_diff(current, version)
+                diff_list.append(issues_diff)
+
+            current = version
+
+        return diff_list
 
 
 class SeveritySerializer(serializers.ModelSerializer):