Make sure to cleanup after monkeypatching template nodes in compress command. Fixes #262

compressor/management/commands/compress.py

@@ -38,6 +38,9 @@ def patched_render(self, context):
     # not, to be able to handle complex inheritance chain.
     self._render_firstnode = MethodType(patched_render_firstnode, self)
     self._render_firstnode(context)
+
+    # Cleanup, uninstall our _render monkeypatch now that it has been called
+    self._render = self._old_render
     return context
 
 
@@ -52,7 +55,10 @@ def patched_render_firstnode(self, context):
     # its get_parent method so that rendering the ExtendsNode only
     # gives us the blocks content without doing any actual rendering.
     extra_context = {}
+    try:
         firstnode = self.nodelist[0]
+    except IndexError:
+        firstnode = None
     if isinstance(firstnode, ExtendsNode):
         firstnode._log = self._log
         firstnode._log_verbosity = self._log_verbosity
@@ -75,8 +81,11 @@ def patched_render_firstnode(self, context):
             # as well.
             if self._log_verbosity > 0:
                 self._log.write("Caught error when rendering extend node from "
-                                "template %s\n" % self)
+                                "template %s\n" % getattr(self, 'name', self))
             return None
+        finally:
+            # Cleanup, uninstall our get_parent monkeypatch now that it has been called
+            firstnode.get_parent = firstnode._old_get_parent
     return extra_context
 
 
@@ -89,6 +98,7 @@ def patched_get_parent(self, context):
     compiled_template = self._old_get_parent(context)
     compiled_template._log = self._log
     compiled_template._log_verbosity = self._log_verbosity
+    compiled_template._old_render = compiled_template._render
     compiled_template._render = MethodType(patched_render, compiled_template)
     return compiled_template
 

compressor/tests/test_offline.py

@@ -27,14 +27,13 @@ class OfflineTestCaseMixin(object):
         self._old_compress_offline = settings.COMPRESS_OFFLINE
         self._old_template_dirs = settings.TEMPLATE_DIRS
         self._old_offline_context = settings.COMPRESS_OFFLINE_CONTEXT
-        self._old_template_loaders = settings.TEMPLATE_LOADERS
         self.log = StringIO()
 
-        # Force template dirs, because it enables us to force compress to
+        # Reset template dirs, because it enables us to force compress to
         # consider only a specific directory (helps us make true,
         # independant unit tests).
         settings.TEMPLATE_DIRS = (
-            os.path.join(settings.TEMPLATE_DIRS[0], self.templates_dir),
+            os.path.join(settings.TEST_DIR, 'test_templates', self.templates_dir),
         )
         # Enable offline compress
         settings.COMPRESS_ENABLED = True
@@ -47,7 +46,6 @@ class OfflineTestCaseMixin(object):
         settings.COMPRESS_ENABLED = self._old_compress
         settings.COMPRESS_OFFLINE = self._old_compress_offline
         settings.TEMPLATE_DIRS = self._old_template_dirs
-        settings.TEMPLATE_LOADERS = self._old_template_loaders
         self.template_file.close()
         manifest_path = os.path.join('CACHE', 'manifest.json')
         if default_storage.exists(manifest_path):
@@ -72,6 +70,24 @@ class OfflineGenerationBlockSuperMultipleTestCase(OfflineTestCaseMixin, TestCase
     templates_dir = "test_block_super_multiple"
     expected_hash = "2f6ef61c488e"
 
+class OfflineGenerationBlockSuperMultipleWithCachedLoaderTestCase(OfflineTestCaseMixin, TestCase):
+    templates_dir = "test_block_super_multiple_cached"
+    expected_hash = "2f6ef61c488e"
+
+    def setUp(self):
+        self._old_template_loaders = settings.TEMPLATE_LOADERS
+        settings.TEMPLATE_LOADERS = (
+            ('django.template.loaders.cached.Loader', (
+                'django.template.loaders.filesystem.Loader',
+                'django.template.loaders.app_directories.Loader',
+            )),
+        )
+        super(OfflineGenerationBlockSuperMultipleWithCachedLoaderTestCase, self).setUp()
+
+    def tearDown(self):
+        super(OfflineGenerationBlockSuperMultipleWithCachedLoaderTestCase, self).tearDown()
+        settings.TEMPLATE_LOADERS = self._old_template_loaders
+
 
 class OfflineGenerationBlockSuperTestCaseWithExtraContent(OfflineTestCaseMixin, TestCase):
     templates_dir = "test_block_super_extra"

compressor/tests/test_templates/test_block_super_multiple_cached/base.html

@@ -0,0 +1,15 @@
+{% spaceless %}
+{% block js %}
+    <script type="text/javascript">
+        alert("test using multiple inheritance and block.super");
+    </script>
+{% endblock %}
+
+{% block css %}
+    <style type="text/css">
+        body {
+            background: red;
+        }
+    </style>
+{% endblock %}
+{% endspaceless %}

compressor/tests/test_templates/test_block_super_multiple_cached/base2.html

@@ -0,0 +1,3 @@
+{% extends "base.html" %}
+
+{% block css %}{% endblock %}

compressor/tests/test_templates/test_block_super_multiple_cached/test_compressor_offline.html

@@ -0,0 +1,11 @@
+{% extends "base2.html" %}
+{% load compress %}
+
+{% block js %}{% spaceless %}
+	{% compress js %}
+	    {{ block.super }}
+	    <script type="text/javascript">
+	        alert("this alert shouldn't be alone!");
+	    </script>
+	{% endcompress %}
+{% endspaceless %}{% endblock %}