misc: initialize cell library once application is ready (#9066)

combo/data/__init__.py

@@ -0,0 +1 @@
+default_app_config = 'combo.data.apps.DataConfig'

combo/data/apps.py

@@ -0,0 +1,25 @@
+# combo - content management system
+# Copyright (C) 2014-2015  Entr'ouvert
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU Affero General Public License as published
+# by the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from django.apps import AppConfig
+
+class DataConfig(AppConfig):
+    name = 'combo.data'
+    verbose_name = 'Data'
+
+    def ready(self):
+        from .library import library
+        library.ready()

combo/data/library.py

@@ -27,14 +27,15 @@ class Library(object):
     def get_cell_classes(self):
         return self.classes
 
+    def ready(self):
+        # initialize the dictionary
+        self.classes_by_content_str = {}
+        for klass in self.classes:
+            content_type = ContentType.objects.get_for_model(klass)
+            content_type_str_v = '%s_%s' % (content_type.app_label, content_type.model)
+            self.classes_by_content_str[content_type_str_v] = klass
+
     def get_cell_class(self, content_type_str):
-        if self.classes_by_content_str is None:
-            # initialize the dictionary
-            self.classes_by_content_str = {}
-            for klass in self.classes:
-                content_type = ContentType.objects.get_for_model(klass)
-                content_type_str_v = '%s_%s' % (content_type.app_label, content_type.model)
-                self.classes_by_content_str[content_type_str_v] = klass
         return self.classes_by_content_str[content_type_str]
 
     def register_cell_class(self, klass):