Home Upgrade your rails app from rails-4.2.5 to rails 4.2.10
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Upgrade your rails app from rails-4.2.5 to rails 4.2.10

user734
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user734 Published in June 23, 2018, 4:30 am

I am trying to upgrade my rails app to rails version 4.2.10 from rails version 4.2.5 . I am using react for the front end. What I did was: First I remove the line gem 'rails', '~> 4.2.5' from gemfile. Second add the line gem 'rails', '~> 4.2.10' to gemfile. Then created a new gemset (gemset create app_name_rails_4.2.10) gemset use app_name_rails_4.2.10. Deleted the gemfile.lock Then run bundle install.

After that when I start the serever ,

I am getting error in console is ----- Response to preflight request doesn't pass access control check: The value of the 'Access-Control-Allow-Credentials' header in the response is '' which must be 'true' when the request's credentials mode is 'include'.

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