Simple Rails Improvements

written by Jan on January 16th, 2007 @ 09:13 PM

Maybe I’ve been missing some function-names or missed some extensions, or maybe I’m just trying to do things too complex, but during the time I’ve worked on a new project in Rails I’ve been missing some functions. What I do then is extend Ruby/Rails’s base classes (Hooray for Ruby) so I can do the magic I want anyway. Todays example of some of those extensions are 2 new methods of the Hash class.

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class Hash

  # This function returns a hash excluding the keys given.
  def exclude (*key)
    key.inject(self.clone) do |me, key|
      me.reject{ |k,v| k == key }
    end
  end

  # This functions does a has_key? on multiple keys
  def has_keys? (*keys)
    keys.each do |key|
      return false unless has_key? key
    end
    return true
  end
end

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Comments

  • Marc on 03 Dec 00:54

    Hey Jan - so I'm trying to do something similar, in that I'm extending Hash in one of my Rails projects. Unfortunately, I don't know where to put the file so that it's picked up by the interpreter. How do I do this?

    Thanks!

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