I am running an old project which is built in rails 3.1 and ruby-1.9.3. When I am trying to migrate my models, it is causing the following problem.
rake db:migrate ->
Top level ::CompositeIO is deprecated, require 'multipart/post' and use Multipart::Post::CompositeReadIO instead!
rake aborted!
NoMethodError: undefined method `deprecate_constant' for Object:Class
I have searched a lot but unfortunately could not find a solution. My environment is as follows.
- Rails 3.1 ruby 1.9.3 postgres 9.6 bundler 1.17.3