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POHow to use prawn on maglev
 

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  1. POHow to use prawn on maglev
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    <p>Being new to maglev I wanted to start with a small, but still useful example. So i decided to start moving the ruby classes I use to generate my invoices to maglev. However I ran in an unexpected problem using the (excellent) prawn PDF-library.</p> <p>Being on rvm I generated a gemset for the application which is setup in a .rvmrc for the invoice directory. It gets used when I cd into it:</p> <pre><code>Using /Users/patru/.rvm/gems/maglev-head with gemset invoice </code></pre> <p>When I install prawn everything starts out fine, the gem seems to be installed and the ri-docs are being generated. However, trouble starts when rdoc should be created, the maglev provided gem command gives me</p> <pre><code> gem install prawn [INFO] The MagLev team publishes customized versions of some gems. ... Successfully installed prawn-0.12.0 1 gem installed Installing ri documentation for prawn-0.12.0... RDoc failure in lib/prawn/images/jpg.rb at or around line 20 column 26 Before reporting this, could you check that the file you're documenting compiles cleanly--RDoc is not a full Ruby parser, and gets confused easily if fed invalid programs. The internal error was: ERROR: While generating documentation for prawn-0.12.0 ... MESSAGE: global $@ is a read-only variable ... RDOC args: --ri --op /Users/patru/.rvm/gems/maglev-head@invoice/doc/prawn-0.12.0/ri --title Prawn Documentation --main README -q lib README.md LICENSE COPYING GPLv2 GPLv3 --title prawn-0.12.0 Documentation --quiet a RubySystemExit occurred (error 2752) </code></pre> <p>No big deal to live without documentation, it is good enough, but something else seems to go wrong, gem list says</p> <pre><code>Ascii85 (1.0.1) bundler (1.0.21) erector (0.8.3) pdf-reader (0.10.1) polyglot (0.3.3) prawn (0.12.0) rake (0.9.2) treetop (1.4.10) ttfunk (1.0.3) </code></pre> <p>so all seems to be well, but if I do</p> <pre><code>require 'ruby gems' require 'prawn' </code></pre> <p>in irb (which works perfectly on my ree-1.8.7) I get a strange</p> <pre><code>NoMethodError: NoMethodError: undefined method `ruby_18' for from /Users/patru/.rvm/gems/maglev-head@invoice/gems/prawn-0.12.0/lib/prawn/core/object_store.rb:246:in `__compileClass' from /Users/patru/.rvm/gems/maglev-head@invoice/gems/prawn-0.12.0/lib/prawn/core/object_store.rb:14:in `__compileClass' from /Users/patru/.rvm/gems/maglev-head@invoice/gems/prawn-0.12.0/lib/prawn/core/object_store.rb:13:in `__compileClass' from /Users/patru/.rvm/gems/maglev-head@invoice/gems/prawn-0.12.0/lib/prawn/core/object_store.rb:12 from /Users/patru/.rvm/rubies/maglev-head/src/kernel/bootstrap/Kernel.rb:831:in `gem_original_require' from /Users/patru/.rvm/rubies/maglev-head/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require' from /Users/patru/.rvm/rubies/maglev-head/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:57:in `require' from /Users/patru/.rvm/gems/maglev-head@invoice/gems/prawn-0.12.0/lib/prawn/core.rb:78 from /Users/patru/.rvm/rubies/maglev-head/src/kernel/bootstrap/Kernel.rb:831:in `gem_original_require' from /Users/patru/.rvm/rubies/maglev-head/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require' from /Users/patru/.rvm/rubies/maglev-head/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:57:in `require' from /Users/patru/.rvm/gems/maglev-head@invoice/gems/prawn-0.12.0/lib/prawn.rb:11 from /Users/patru/.rvm/rubies/maglev-head/src/kernel/bootstrap/Kernel.rb:831:in `gem_original_require' from /Users/patru/.rvm/rubies/maglev-head/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:59:in `require' from /Users/patru/.rvm/rubies/maglev-head/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:57:in `require' from /Users/patru/.rvm/rubies/maglev-head/src/kernel/bootstrap/Kernel.rb:831:in `gem_original_require' from /Users/patru/.rvm/rubies/maglev-head/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require' from /Users/patru/.rvm/rubies/maglev-head/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:57:in `require' from (irb):5:in `__compileEval' from (irb):7:in `__compileEval' from /Users/patru/.rvm/rubies/maglev-head/src/kernel/bootstrap/Kernel.rb:394:in `eval' from /Users/patru/.rvm/rubies/maglev-head/lib/ruby/1.8/irb.rb:159:in `eval_input' ... </code></pre> <p>I am probably missing something obvious here. Suffice it to say that the 'erector' gem I installed as well (see the gem list above) can be required without problems, so I do not do everything wrong ;-)</p>
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