Error Using Ruby generator in Rails (not Rails::Generator)

Question

Edit: To be clear, I'm trying to use this kind of generator (i.e. with a 'yield' statement) not a Rails generator.

I have the following (simplified) initializer mixin in a Rails project that I could use some help with. What I wanted to do was create a generator to track Twitter API calls (this is just for debugging, I know about rate_limit_status).

require 'generator'
# Be sure to restart your server when you modify this file.
module TwitterMixin
  def get_auth
    @auth ||= Twitter::HTTPAuth.new(ENV['TWITTER_USER'], ENV['TWITTER_PASS'])
  end
  def count
    @counter ||= generator.new
    @counter.yield
  end
  def client
    p "#{count} Twitter API calls this iteration"
    @client ||= Twitter::Base.new(get_auth)
  end
end

The problem is that I'm getting the following error:

dlopen(/Users/john/.gem/ruby/1.8/gems/json-1.2.0/ext/json/ext/generator.bundle, 9): no suitable image found.  Did find:
/Users/john/.gem/ruby/1.8/gems/json-1.2.0/ext/json/ext/generator.bundle: mach-o, but wrong architecture - /Users/john/.gem/ruby/1.8/gems/json-1.2.0/ext/json/ext/generator.bundle

Which seems like a collision with the json generator, which is probably in a more enclosing scope. The main question is how to I ensure a Ruby standard library class (specifically the generator class) is called?

I'm still new to Ruby, BTW, and searching for "generators in Rails" is pretty dominated by Rails::Generator, so this may be fairly obvious. Also, I'm open to more elegant solutions to this problem that I may have missed. Thanks.

generator is part of the Ruby 1.8 standard library, there's some documentation at ruby-doc.org/stdlib/libdoc/generator/rdoc/index.html if that's any use. It's not in 1.9, though - I haven't fully understood why. — Mike Woodhouse
– Mike Woodhouse, Commented Jan 27, 2010 at 19:03
I imagine it's because you can use yield directly? Not sure how you'd subclass it though. Probably just build yield into a method of the class like Python. — Terra Kestrel
– Terra Kestrel, Commented Jan 28, 2010 at 4:34

Jaime Bellmyer · Accepted Answer · 2010-01-27 17:16:38Z

1

Do you have a ruby gem on your system called "generator"? It sounds like ruby is having trouble locating the gem based on your require. If you're using the Rubigen generator, then you need:

require 'rubigen'

and so forth. try running:

gem list generator

If it doesn't pull anything up, you're probably calling the library by the wrong name.

answered Jan 27, 2010 at 17:16

Jaime Bellmyer

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2 Comments

Terra Kestrel Over a year ago

didn't realize I had to use a gem, I was thinking that it would be a standard library class as in: ruby-doc.org/core/classes/Generator.html Maybe I'm misunderstanding something about the standard library?

Terra Kestrel Over a year ago

Oh, I now see that might be more name collision with Rails::Generator which is why I can't find any solutions searching.

Terra Kestrel · Accepted Answer · 2010-01-27 21:35:09Z

0

You don't have to build a generator, you can use the yield method directly, which I didn't realize. This code works.

# Be sure to restart your server when you modify this file.
module TwitterMixin
  def get_auth
    @auth ||= Twitter::HTTPAuth.new(ENV['TWITTER_USER'], ENV['TWITTER_PASS'])
  end
  def count
    @num ||= 0
    while true
      num += 1
      yield num
    end
  end
  def client
    p "#{count} Twitter API calls this iteration"
    @client ||= Twitter::Base.new(get_auth)
  end
end

answered Jan 27, 2010 at 21:35

Terra Kestrel

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Comments

Terra Kestrel · Accepted Answer · 2010-01-29 05:29:01Z

0

Let me reject my earlier answer and say that it was rather stupid of me to use "yield" thinking that it was a generator builtin similar to Python's yield statement. I learned today at our first RubyGorge meeting about Ruby blocks. Thus, I think I still seek a solution to this problem.

answered Jan 29, 2010 at 5:29

Terra Kestrel

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1 Comment

Terra Kestrel Over a year ago

Selecting this as an answer because after learning more about Ruby (hand about a week under my belt at this question) I've realized that I was asking the wrong question.

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