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Remove Gemfile.lock
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Add into Gemfile
# Windows does not include zoneinfo files, so bundle the tzinfo-data gem gem 'tzinfo-data', platforms: [:mingw, :mswin]
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Install all packets:
$ bundle install
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Make migration:
$ rake db:migrate RAILS_ENV=development
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Start server:
$ rails s
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Using a browser, go to ‘localhost:3000/posts` and you’ll see index page for Posts.