add basic changelog api

pandora/changelog/models.py

@@ -11,3 +11,6 @@ class Changelog(models.Model):
 
     def __unicode__(self):
         return u'%s %s' %(self.type, self.created)
+
+    def json(self):
+        return self.value

pandora/changelog/views.py

@@ -1 +1,91 @@
-# Create your views here.
+# -*- coding: utf-8 -*-
+# vi:si:et:sw=4:sts=4:ts=4
+from __future__ import division
+
+import ox
+
+from ox.django.decorators import admin_required_json
+from ox.django.shortcuts import render_to_json_response, json_response
+
+from ox.django.api import actions
+
+from item import utils
+
+import models
+
+
+def parse_query(data, user):
+    query = {}
+    query['range'] = [0, 100]
+    query['sort'] = [{'key':'name', 'operator':'+'}]
+    for key in ('keys', 'group', 'list', 'range', 'sort', 'query'):
+        if key in data:
+            query[key] = data[key]
+    #query['qs'] = models.Changelog.objects.find(query, user)
+    query['qs'] = models.Changelog.all()
+    return query
+
+def order_query(qs, sort):
+    order_by = []
+    for e in sort:
+        operator = e['operator']
+        if operator != '-':
+            operator = ''
+        key = {
+        }.get(e['key'], e['key'])
+        order = '%s%s' % (operator, key)
+        order_by.append(order)
+    if order_by:
+        qs = qs.order_by(*order_by, nulls_last=True)
+    return qs
+
+@admin_required_json
+def findChangeLogs(request, data):
+    '''
+        takes {
+            query: {
+                conditions: [
+                    {
+                        key: 'user',
+                        value: 'something',
+                        operator: '='
+                    }
+                ]
+                operator: ","
+            },
+            sort: [{key: 'created', operator: '+'}],
+            range: [int, int]
+            keys: [string]
+        }
+        returns {
+            items: [object]
+        }
+
+    '''
+    response = json_response()
+
+    query = parse_query(data, request.user)
+    qs = order_query(query['qs'], query['sort'])
+    qs = qs.distinct()
+    if 'keys' in data:
+        qs = qs.select_related()
+        qs = qs[query['range'][0]:query['range'][1]]
+        response['data']['items'] = [p.json(data['keys']) for p in qs]
+    elif 'position' in query:
+        ids = [i.get_id() for i in qs]
+        data['conditions'] = data['conditions'] + {
+            'value': data['position'],
+            'key': query['sort'][0]['key'],
+            'operator': '^'
+        }
+        query = parse_query(data, request.user)
+        qs = order_query(query['qs'], query['sort'])
+        if qs.count() > 0:
+            response['data']['position'] = utils.get_positions(ids, [qs[0].public_id])[0]
+    elif 'positions' in data:
+        ids = [ox.toAZ(i.id) for i in qs]
+        response['data']['positions'] = utils.get_positions(ids, data['positions'])
+    else:
+        response['data']['items'] = qs.count()
+    return render_to_json_response(response)
+actions.register(findChangeLogs)