Can't install ffi gem, Rails fail

While creating creating an integration test via rails generate integration_test foo it declined with

Could not find ffi-1.0.9 in any of the sources
Run `bundle install` to install missing gems.

I ran bundle install to install missing gems, but with no success. Still the same error. I have gem 'ffi' in my Gemfile.

I switched the gemf开发者_开发技巧ile line to gem 'ffi', :git => 'git://github.com/ffi/ffi.git' and bundle installed again. It did all sort of stuff and wrote "Your bundle is complete" at the end.

However when I run the rails generate... command again I get:

git://github.com/ffi/ffi.git (at master) is not checked out. Please run 'bundle install'

What the hell is going on with this ffi?

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I ran into the same problem and solved it by removing the Gemfile.lock and re-run bundle install.

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Perhaps try 'bundle exec rails generate...'

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bundle install was failing because it could ffi failed with NoMethodError for spec.

Removing Gemfile.lock, empty the gemset and doing bundle install worked.