Classify a Ruby string

Classify a Ruby string

I have a program that create classes which looks like:

  MyClass = Class.new do      def initialize; end      # ...    end  

But I would like to name dynamically MyClass, from a string. And because it's for the name of a class, I would like to classify that string, for instance (thanks Rails methods):

  "hello_world".classify # => "HelloWorld"  

I don't know if in pure Ruby there is a method for that.

Thank you

Answer by mway for Classify a Ruby string

No, there isn't. Here's the String reference page.

You could do so like this:

"hello_world".split('_').collect!{ |w| w.capitalize }.join  

You could easily implement this by reclassing the String class.

However, if you're using Rails for whatever reason, classify is added for convenience, along with the underscore method. I believe it's still used in Rails 3.

Answer by Mladen Jablanovi for Classify a Ruby string

Not sure if your question is only about constructing a camelcased string, or also about assigning a newly created class to it. Because, for the latter, you should use Module::const_set method:

class_name = 'MyClass'  #=> "MyClass"  klass = Class.new do    def foo      "foo"    end  end  #=> #  Object.const_set class_name, klass  #=> Module::MyClass  MyClass.new.foo  #=> "foo"  

Answer by fifigyuri for Classify a Ruby string

For Classifying strings you can use active_support:

require 'active_support/core_ext/string'  puts "hello_world" #=> "HelloWorld"  

Answer by Cosmin Atanasiu for Classify a Ruby string

If you wanted just to access the class from a string name, and not define it from a string, you can also use this:

MyClass = Class.new do      def test; end      # ...  end  "MyClass".constantize.test # => what you wanted ?  

Answer by Thomas07vt for Classify a Ruby string

This is much later, but I am going through this process and expanding on mway's answer I am using this:

class String    def classify      self.split('/').collect do |c|        c.split('_').collect(&:capitalize).join      end.join('::')    end  end  

This will allow you to add namespaces to strings. So:

"api/post_comments".classify  => "Api::PostComments"   

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