Add trust_level_locked column

db/migrate/20140913192733_add_trust_level_locked_column.rb

@@ -0,0 +1,19 @@
+class AddTrustLevelLockedColumn < ActiveRecord::Migration
+  def change
+    add_column :users, :trust_level_locked, :boolean, { default: false, null: false}
+
+    reversible do |dir|
+      dir.up do
+        # Populate the column
+        execute <<-SQL
+          UPDATE users
+          SET trust_level_locked = 't'
+          WHERE trust_level = 4
+        SQL
+      end
+      dir.down do
+        # column is removed, no need to fill it
+      end
+    end
+  end
+end