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In the gem file for https://github.com/justinfrench/formtastic they have:
gem 'formtastic', '~> 2.0.0'
What does the ~> mean.
It actually gives me the error “Could not find gem ‘formtastic (~> 2.0.0, runtime)’ in any of the gem sources.”
It’s a confusing operand, but it limits versions to a subset of the possible versions. So
~> 2.0.0means “>= 2.0.0 and < 2.1.0” in version numbers.1.2.3 seems to be the latest version of Formtasic, that’s why you’re getting this error message.