Create file for utility function and add function.

mediagoblin/media_types/blog/lib.py

@@ -0,0 +1,26 @@
+# GNU MediaGoblin -- federated, autonomous media hosting
+# Copyright (C) 2011, 2012 MediaGoblin contributors.  See AUTHORS.
+#
+# 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 mediagoblin.db.base import Session
+
+
+def check_blog_slug_used(author_id, slug, ignore_b_id=None):
+    from mediagoblin.media_types.blog.models import Blog
+    query = Blog.query.filter_by(author=author_id, slug=slug)
+    if ignore_b_id:
+        query = query.filter(Blog.id != ignore_b_id)
+    does_exist = query.first() is not None
+    return does_exist