Facilitate renaming Constance in Admin (#173)

* Load app_config dynamically and use verbose_name

* Instead of assuming the app config is always going to be ConstanceConfig, load it dynamically in case the user overrides it
* Use verbose_name for page title instead of static strings for create_list
* Use verbose_name for create_list breadcrumbs

These changes allows the user to easily rename "Constance" to something else in their project.

* Fix use of verbose_name in title and breadcrumbs

constance/admin.py

@@ -5,6 +5,7 @@ from operator import itemgetter
 from collections import OrderedDict
 
 from django import forms, VERSION
+from django.apps import apps
 from django.conf.urls import url
 from django.contrib import admin, messages
 from django.contrib.admin import widgets
@@ -20,7 +21,7 @@ from django.utils.module_loading import import_string
 from django.utils.translation import ugettext_lazy as _
 
 
-from . import LazyConfig, settings, apps
+from . import LazyConfig, settings
 
 config = LazyConfig()
 
@@ -190,7 +191,7 @@ class ConstanceAdmin(admin.ModelAdmin):
                 return HttpResponseRedirect('.')
         context = {
             'config_values': [],
-            'title': _('Constance config'),
+            'title': self.model._meta.app_config.verbose_name,
             'app_label': 'constance',
             'opts': self.model._meta,
             'form': form,
@@ -255,12 +256,12 @@ class Config(object):
 
         def get_change_permission(self):
             return 'change_%s' % self.model_name
-        
+
         @property
         def app_config(self):
-            return apps.ConstanceConfig
+            return apps.get_app_config(self.app_label)
 
     _meta = Meta()
-    
+
 
 admin.site.register([Config], ConstanceAdmin)

constance/templates/admin/constance/change_list.html

@@ -75,7 +75,7 @@
 {% block breadcrumbs %}
 <div class="breadcrumbs">
   <a href="{% url 'admin:index' %}">{% trans 'Home' %}</a>
-  &rsaquo; <a href="{% url 'admin:app_list' app_label=opts.app_label %}">{{ app_label|capfirst|escape }}</a>
+  &rsaquo; <a href="{% url 'admin:app_list' app_label=opts.app_label %}">{{ opts.app_config.verbose_name }}</a>
   &rsaquo; {{ opts.verbose_name_plural|capfirst }}
 </div>
 {% endblock %}