Dont access __copy__ when it doesnt work. Preprocess context list so the dictionary cannot be modified.

Author: dcramer

debug_toolbar/panels/template.py

@@ -47,7 +47,29 @@ def __init__(self, *args, **kwargs):
         template_rendered.connect(self._store_template_info)
 
     def _store_template_info(self, sender, **kwargs):
-        kwargs['context'] = kwargs['context'].__copy__()
+        context_data = kwargs['context']
+
+        context_list = []
+        for context_layer in context_data.dicts:
+            if hasattr(context_layer, 'items'):
+                for key, value in context_layer.items():
+                    # Replace any request elements - they have a large
+                    # unicode representation and the request data is
+                    # already made available from the Request Vars panel.
+                    if isinstance(value, http.HttpRequest):
+                        context_layer[key] = '<<request>>'
+                    # Replace the debugging sql_queries element. The SQL
+                    # data is already made available from the SQL panel.
+                    elif key == 'sql_queries' and isinstance(value, list):
+                        context_layer[key] = '<<sql_queries>>'
+                    # Replace LANGUAGES, which is available in i18n context processor
+                    elif key == 'LANGUAGES' and isinstance(value, tuple):
+                        context_layer[key] = '<<languages>>'
+            try:
+                context_list.append(pformat(context_layer))
+            except UnicodeEncodeError:
+                pass
+        kwargs['context'] = context_list
         self.templates.append(kwargs)
 
     def nav_title(self):
@@ -88,28 +110,7 @@ def content(self):
             info['template'] = template
             # Clean up context for better readability
             if getattr(settings, 'DEBUG_TOOLBAR_CONFIG', {}).get('SHOW_TEMPLATE_CONTEXT', True):
-                context_data = template_data.get('context', None)
-
-                context_list = []
-                for context_layer in context_data.dicts:
-                    if hasattr(context_layer, 'items'):
-                        for key, value in context_layer.items():
-                            # Replace any request elements - they have a large
-                            # unicode representation and the request data is
-                            # already made available from the Request Vars panel.
-                            if isinstance(value, http.HttpRequest):
-                                context_layer[key] = '<<request>>'
-                            # Replace the debugging sql_queries element. The SQL
-                            # data is already made available from the SQL panel.
-                            elif key == 'sql_queries' and isinstance(value, list):
-                                context_layer[key] = '<<sql_queries>>'
-                            # Replace LANGUAGES, which is available in i18n context processor
-                            elif key == 'LANGUAGES' and isinstance(value, tuple):
-                                context_layer[key] = '<<languages>>'
-                    try:
-                        context_list.append(pformat(context_layer))
-                    except UnicodeEncodeError:
-                        pass
+                context_list = template_data.get('context', [])
                 info['context'] = '\n'.join(context_list)
             template_context.append(info)