Rails core - Dec 2013 - small extension: Make a hash of queried data(ActiveRecord::Relation)

Make a hash of queried data(`ActiveRecord::Relation`) which user can 
specify key 
and value of the hash for some situations.
 
    Example:

        # Before you do it like this
        authors = Author.where(name: ''Hank Moody'')
        authors_hash = {}
        authors.each do |author|
            authors_hash.store(author.id, author.desc)
        end

        # Now you do this
        authors = Author.where(name: ''Hank Moody'')
        authors_hash = authors.as_hash(:id, :desc)


  def as_hash(key, value, &block)       
>
>     k = key.to_s
>
>     v = value.to_s
>
>     hash = {}
>
>     self.each do |item|
>
>       hash.store(item[k], item[v])
>
>       yield item if block_given?
>
>     end
>
>     hash
>
>   end
>
>
is it helpful? 

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