model - how can i generate a diagram from a rails project? -

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I am trying to generate a rail diagram from a project with rail. But I am getting a rail: Command plugin was not found even after installing: sudo gem install roadrail What is the problem? Is there any alternative to that plugin? Thanks for your help

The command is: 

  Set up the Sudo Mani Railway

Verify the road that the gem 

  Sudo Gem list is installed by rail

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