1 files changed, 55 insertions, 0 deletions
diff --git a/db/post_migrate/20170317162059_update_upload_paths_to_system.rb b/db/post_migrate/20170317162059_update_upload_paths_to_system.rb
new file mode 100644
index 00000000000..9a77b0bbdfb
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+++ b/db/post_migrate/20170317162059_update_upload_paths_to_system.rb
@@ -0,0 +1,55 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class UpdateUploadPathsToSystem < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  AFFECTED_MODELS = %w(User Project Note Namespace Appearance)
+
+  def up
+    update_column_in_batches(:uploads, :path, replace_sql(arel_table[:path], base_directory, new_upload_dir)) do |_table, query|
+      query.where(uploads_to_switch_to_new_path)
+    end
+  end
+
+  def down
+    update_column_in_batches(:uploads, :path, replace_sql(arel_table[:path], new_upload_dir, base_directory)) do |_table, query|
+      query.where(uploads_to_switch_to_old_path)
+    end
+  end
+
+  # "SELECT \"uploads\".* FROM \"uploads\" WHERE \"uploads\".\"model_type\" IN ('User', 'Project', 'Note', 'Namespace', 'Appearance') AND (\"uploads\".\"path\" ILIKE 'uploads/%' AND NOT (\"uploads\".\"path\" ILIKE 'uploads/system/%'))"
+  def uploads_to_switch_to_new_path
+    affected_uploads.and(starting_with_base_directory).and(starting_with_new_upload_directory.not)
+  end
+
+  # "SELECT \"uploads\".* FROM \"uploads\" WHERE \"uploads\".\"model_type\" IN ('User', 'Project', 'Note', 'Namespace', 'Appearance') AND (\"uploads\".\"path\" ILIKE 'uploads/%' AND \"uploads\".\"path\" ILIKE 'uploads/system/%')"
+  def uploads_to_switch_to_old_path
+    affected_uploads.and(starting_with_new_upload_directory)
+  end
+
+  def starting_with_base_directory
+    arel_table[:path].matches("#{base_directory}/%")
+  end
+
+  def starting_with_new_upload_directory
+    arel_table[:path].matches("#{new_upload_dir}/%")
+  end
+
+  def affected_uploads
+    arel_table[:model_type].in(AFFECTED_MODELS)
+  end
+
+  def base_directory
+    "uploads"
+  end
+
+  def new_upload_dir
+    File.join(base_directory, "system")
+  end
+
+  def arel_table
+    Arel::Table.new(:uploads)
+  end
+end