From: Thomas Sawyer <transfire@...>
Date: 2011-11-24T08:33:21+09:00
Subject: [ruby-core:41267] [ruby-trunk - Feature #4862] Struct#to_hash


Issue #4862 has been updated by Thomas Sawyer.


Despite it's implementation, I thought Struct was intended to provide a convenient way to make quick classes. Which is why I assume it would have instance variables. I can understand though that it would be implemented in another fashion for speed. But I would still think the public interface to appear as if it were a typical sort of class.

Given it's current interface it hardly resembles a Hash at all. I think #each at least should act the same as a Hash if #to_hash would be added to it, but instead it acts like an Array:

>> s =  Struct.new(:a, :b).new(1,2)
=> #<struct a=1, b=2>
>> s.map{ |a| a }
=> [1, 2]

> "because there is no #to_h (but indeed it is somewhat inconsistent with #to_i, #to_int, ...)"

Not just "somewhat". So I ignore all that heehawing and define #to_h wherever it makes sense when I need it. Why #to_h should be carved out as some odd exception seems to me just a lot of needless fuss over... what?



----------------------------------------
Feature #4862: Struct#to_hash
http://redmine.ruby-lang.org/issues/4862

Author: Hal Brodigan
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


Occasionally, it is necessary to convert a Struct to a Hash (especially when generating JSON from an Array of Structs). A Struct#to_hash method would be very useful in this situation.

    class Struct

      #
      # Returns the Hash representation of the members and values within the struct.
      #
      def to_hash
        new_hash = {}

        each_pair do |member,value|
          new_hash[member] = value
        end

        new_hash
      end

    end


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