Railscasts - Making Generators in Rails 3

#218

Jun 14, 2010

Making Generators in Rails 3

Generators in Rails 3 have been rewritten to use Thor which means the code used to create a generator is quite different. Here you will learn the new way to make generators in Rails 3.

Tags: rails-3.0 tools

Download (14 MB, 10:07)

alternative download for iPod & Apple TV (13.8 MB, 10:07)

Read it on ASCIIcasts

Resources

rails g generator --help
rails g generator layout
rails g layout --help
rails g layout admin
rails g layout foo --skip-stylesheet

# lib/generators/layout/layout_generator.rb
class LayoutGenerator < Rails::Generators::Base
  source_root File.expand_path('../templates', __FILE__)
  argument :layout_name, :type => :string, :default => "application"
  class_option :stylesheet, :type => :boolean, :default => true, :desc => "Include stylesheet file."
  
  def generate_layout
    copy_file "stylesheet.css", "public/stylesheets/#{file_name}.css" if options.stylesheet?
    template "layout.html.erb", "app/views/layouts/#{file_name}.html.erb"
  end
  
  private
  
  def file_name
    layout_name.underscore
  end
end

# lib/generators/layout/templates/layout.html.erb
<!DOCTYPE html>
<html>
  <head>
    <title>Untitled</title>
    <%- if options.stylesheet? -%>
    <%%= stylesheet_link_tag "<%= file_name %>" %>
    <%- end -%>
    <%%= javascript_include_tag :defaults %>
    <%%= csrf_meta_tag %>
    <%%= yield(:head) %>
  </head>
  <body>
    <div id="container">
      <%% flash.each do |name, msg| %>
        <%%= content_tag :div, msg, :id => "flash_#{name}" %>
      <%% end %>
      <%%= yield %>
    </div>
  </body>
</html>

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15 comments

1. Ryan Jun 14, 2010 at 02:06

Cool, busy updating my gems with rails 3 generators.

Thanks

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2. leo Jun 14, 2010 at 03:30

Just reviewed #216, and found this one. You are unbelievable. Thanks a lot.

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3. Aaron Jun 14, 2010 at 03:43

Ryan, I don't know what you started doing with your videos, but they are all messed up now when I view them with VLC on Ubuntu.

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4. Xpepermint Jun 14, 2010 at 05:28

I believe the problem is in VLC.

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5. Aaron Jun 14, 2010 at 06:03

@Xpepermint, well, of course it is but my version VLC hasn't changed, so he must be doing something different with his encoding since about episode 210 give or take an episode. I'm not sure why he changed the way he encoded his video files since then, but I'm just wondering if he could go back to doing what he was doing before this started happening.

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6. Jerry Jun 14, 2010 at 06:27

Hey Ryan, great cast as always. Already enjoyed th cast about generators for version 2.x.

Thx fot that one.

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7. Chip Castle Jun 14, 2010 at 10:40

Hi Ryan,

I just wanted to say that your weekly screencasts always inspire me to be a better Rails programmer. This week is no exception.

Awesome work!
Chip

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8. Michael Jun 14, 2010 at 14:59

Nice one! Thanks lads!

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9. Dom Jun 14, 2010 at 17:27

Very cool, thanks once again. I haven't made the switch to Rails 3 yet, but these episodes are enticing me.

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10. sekrett Jun 16, 2010 at 00:08

@Aaron, I have no problems on Ubuntu 9.10 with Totem player.

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11. Biznes idei Jun 16, 2010 at 10:02

Thanks! I need it. ;)

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12. M Jun 16, 2010 at 17:09

Thanks Ryan, again a wonderful cast

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13. Fredrik Jun 17, 2010 at 14:28

So much new cool features in Rails 3, creating generators actually seems fun now!:)

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14. Benjamin Lewis Jun 17, 2010 at 19:46

Hi Ryan

I just read this "You no longer need to place a minus sign at the end of a ruby interpolation inside an ERb template to remove the trailing carriage return in the HTML output."
http://guides.rails.info/3_0_release_notes.html

Keep the Rails 3 ones coming.
Thanks
Ben

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15. Robert Dober Jun 18, 2010 at 11:52

Aaron, same problem here, however I use the alternate download now, the *.m4v that is, and it works fine with VLC.

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16. he9lin Jun 18, 2010 at 23:39

Thanks Ryan for another great episode. I've learned a lot here. . (grats lakers repeat :p)

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17. Johannes Jun 19, 2010 at 05:19

Nice episode.

Wouldn't a better name for "layout.html.erb" be "layout.html.erb.erb"?

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34. Mike Aug 16, 2010 at 18:59

I think you do a great service to the Rails community, and I think that you do an outstanding job on these videos. You've started saying "basically" pretty often lately though.

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Making Generators in Rails 3

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