+ return instance
+
+
+def validate_template(template):
+ """
+ Makes sure that the template and all included or extended templates are valid.
+ """
+ for node in template.nodelist:
+ try:
+ if isinstance(node, loader_tags.ExtendsNode):
+ extended_template = node.get_parent(Context())
+ validate_template(extended_template)
+ elif isinstance(node, loader_tags.IncludeNode):
+ included_template = loader.get_template(node.template_name.resolve(Context()))
+ validate_template(extended_template)
+ except Exception, e:
+ raise ValidationError("Template code invalid. Error was: %s: %s" % (e.__class__.__name__, e))
+
+
+class TemplateForm(ModelForm):
+ def clean_code(self):
+ code = self.cleaned_data['code']
+ try:
+ t = DjangoTemplate(code)
+ except Exception, e:
+ raise ValidationError("Template code invalid. Error was: %s: %s" % (e.__class__.__name__, e))
+
+ validate_template(t)
+ return code
+
+ class Meta:
+ model = Template
\ No newline at end of file