From b5db508005109ffc50a754145955fc2e6d9dded4 Mon Sep 17 00:00:00 2001
From: Alex Ling <hkalexling@gmail.com>
Date: Thu, 28 Jan 2021 04:04:42 +0000
Subject: [PATCH] Fix relative path mismatch (#151)

---
 migration/relative_path_fix.10.cr | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 migration/relative_path_fix.10.cr

diff --git a/migration/relative_path_fix.10.cr b/migration/relative_path_fix.10.cr
new file mode 100644
index 0000000..26df876
--- /dev/null
+++ b/migration/relative_path_fix.10.cr
@@ -0,0 +1,31 @@
+# In DB version 8, we replaced the absolute paths in DB with relative paths,
+#   but we mistakenly left the starting slashes. This migration removes them.
+class RelativePathFix < MG::Base
+  def up : String
+    <<-SQL
+    -- remove leading slashes from the paths in ids
+    UPDATE ids
+    SET path = SUBSTR(path, 2, LENGTH(path) - 1)
+    WHERE path LIKE '/%';
+
+    -- remove leading slashes from the paths in titles
+    UPDATE titles
+    SET path = SUBSTR(path, 2, LENGTH(path) - 1)
+    WHERE path LIKE '/%';
+    SQL
+  end
+
+  def down : String
+    <<-SQL
+    -- add leading slashes to paths in ids
+    UPDATE ids
+    SET path = '/' || path
+    WHERE path NOT LIKE '/%';
+
+    -- add leading slashes to paths in titles
+    UPDATE titles
+    SET path = '/' || path
+    WHERE path NOT LIKE '/%';
+    SQL
+  end
+end