admin classes python2.7 compatible

simple_locations/admin.py

@@ -5,6 +5,8 @@
 from django.conf import settings
 from django.contrib.gis import admin
 from mptt.admin import MPTTModelAdmin
+from simple_locations.models import Point, AreaType, Area
+
 area_admin_classes = [admin.OSMGeoAdmin, MPTTModelAdmin]
 
 # Translated models are "nice to have"
@@ -16,7 +18,14 @@
     TranslationAdmin = admin.ModelAdmin
     pass
 
-from simple_locations.models import Point, AreaType, Area
+try:
+    # optionally use django_extensions' ForeignKeyAutocompleteAdmin if 
+    # available
+    from django_extensions.admin import ForeignKeyAutocompleteAdmin
+except ImportError:
+    area_admin_classes.append(ForeignKeyAutocompleteAdmin)
+    ForeignKeyAutocompleteAdmin = None
+    pass
 
 
 class PointAdmin(admin.ModelAdmin):
@@ -34,20 +43,26 @@ class AreaChildrenInline(admin.TabularInline):
     extra = 0
 
 
-class AreaAdmin(*area_admin_classes):
-    default_lon = getattr(settings, 'GIS_DEFAULT_LAT', -8.8742)
-    default_lat = getattr(settings, 'GIS_DEFAULT_LON', 125.7275)
-    default_zoom = 16
-    map_template = "simple_locations/admin/osm.html"
-    # debug = True  - enable if copy/pasting WKTs is useful
-    units = 'km'
-    list_display = ('name', 'kind', 'location', 'code')
-    search_fields = ['code', 'name']
-    list_filter = ('kind',)
-    related_search_fields = {'parent': ('^name',)}
-    inlines = [AreaChildrenInline]
+area_admin_settings = {
+    "default_lon": getattr(settings, 'GIS_DEFAULT_LAT', -8.8742),
+    "default_lat": getattr(settings, 'GIS_DEFAULT_LON', 125.7275),
+    "default_zoom": 16,
+    "map_template": "simple_locations/admin/osm.html",
+    # "debug": True  - enable if copy/pasting WKTs is useful,
+    "units": 'km',
+    "list_display": ('name', 'kind', 'location', 'code'),
+    "search_fields": ['code', 'name'],
+    "list_filter": ('kind',),
+    "related_search_fields": {'parent': ('^name',)},
+    "inlines": [AreaChildrenInline]
+}
 
+AreaAdminClass = type(
+    "AreaAdminClass",
+    tuple(area_admin_classes),
+    area_admin_settings
+)
 
 admin.site.register(Point, PointAdmin)
 admin.site.register(AreaType, AreaTypeAdmin)
-admin.site.register(Area, AreaAdmin)
+admin.site.register(Area, AreaAdminClass)