修改version的description的属性

db/migrate/20200220075242_change_versions_descriptions.rb

@@ -0,0 +1,6 @@
+class ChangeVersionsDescriptions < ActiveRecord::Migration[5.2]
+  def change
+    change_column_default :versions, :description, nil
+    change_column :versions, :description, :text
+  end
+end