add json feed for bisac heading tree

bisac/models.py

@@ -10,6 +10,9 @@ class BisacHeading(MPTTModel):
 
     class MPTTMeta:
         order_insertion_by = ['notation']
+    
+    def __unicode__(self):
+        return self.full_label
         
 def populate_bisac_headings():
     for key in bisac.keys():

bisac/urls.py

@@ -0,0 +1,5 @@
+from django.conf.urls.defaults import *
+
+urlpatterns = patterns("",
+    url(r"^tree$", "regluit.bisac.views.tree"),
+)

bisac/views.py

@@ -0,0 +1,29 @@
+import json
+from django.template import Context, Template
+from django.http import HttpResponse
+
+from mptt.templatetags.mptt_tags import cache_tree_children
+
+from regluit.bisac.models import BisacHeading
+
+nodes = BisacHeading.objects.all()
+
+def recursive_node_to_dict(node):
+    result = {
+        'title': node.full_label,
+        'key': node.pk,
+    }
+    children = [recursive_node_to_dict(c) for c in node.get_children()]
+    if children:
+        result['children'] = children
+        result['folder'] = True
+    return result
+
+root_nodes = cache_tree_children(nodes)
+dicts = []
+for n in root_nodes:
+    dicts.append(recursive_node_to_dict(n))
+
+
+def tree(request):
+    return HttpResponse(json.dumps(dicts, indent=4), content_type="application/json")

urls.py

@@ -18,6 +18,7 @@ urlpatterns = patterns('',
     url(r'', include('regluit.payment.urls')),
     url(r'', include('regluit.libraryauth.urls')),
     url(r'', include('regluit.marc.urls')),
+    url(r'^bisac/', include('regluit.bisac.urls')),
     url(r'^selectable/', include('selectable.urls')),
     url(r'^admin/', include(admin_site.urls)), 
     url(r'^comments/', include('django.contrib.comments.urls')),