To get an idea of what a rails generate command is going to to generate, you can do a dry run with the -p flag or the --pretend flag. If you run

$ rails generate model post -p

then you will see the following output

    invoke  active_record
    create    db/migrate/20150513132556_create_posts.rb
    create    app/models/post.rb
    invoke    rspec
    create      spec/models/post_spec.rb
    invoke      factory_girl
    create        spec/factories/posts.rb

though those files will not have actually been created. You now know precisely what rails will generate for you.

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