Rails - Jun 2006 - Converting Hash to and from URL params

I''m sure this is easy since rails does this internally, but I need to 
convert a string of url formatted variables 
"foo=bar&baz=snoo&why=because" to a hash, and I need to
convert a hash
to url format.

Now before I roll my own methods to do this, does rails expose this 
functionality somehow?

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On 14-jun-2006, at 23:54, Alex Wayne wrote:
> I''m sure this is easy since rails does this internally, but I need
to
> convert a string of url formatted variables
> "foo=bar&baz=snoo&why=because" to a hash, and I need to
convert a hash
> to url format.
>
> Now before I roll my own methods to do this, does rails expose this
> functionality somehow?
Not publicly. Look for build_query_string in the Actionpack sources,  
in routing.rb

I have been pathing on it recently but I forgot where it is exactly.

--
Julian ''Julik'' Tarkhanov
please send all personal mail to
me at julik.nl

Julian ''Julik'' Tarkhanov wrote:
> On 14-jun-2006, at 23:54, Alex Wayne wrote:
> 
>> I''m sure this is easy since rails does this internally, but I
need to
>> convert a string of url formatted variables
>> "foo=bar&baz=snoo&why=because" to a hash, and I need
to convert a hash
>> to url format.
>>
>> Now before I roll my own methods to do this, does rails expose this
>> functionality somehow?
> 
> Not publicly. Look for build_query_string in the Actionpack sources,
> in routing.rb
> 
> I have been pathing on it recently but I forgot where it is exactly.
> 
> --
> Julian ''Julik'' Tarkhanov
> please send all personal mail to
> me at julik.nl
Thanks for the location info, but it was only partially useful.  It gave 
me some help writing my own methods, but since they are private in the 
controller code they are innacessible.

For future searchers of similar problems, here is the solution I came up 
with, implemented as an extension fo the Hash class.

allows:
  {:foo => ''bar'', :baz =>
''snoopy''}.to_url_params
  # returns "foo=bar&baz=snoopy"

  Hash.from_url_params("foo=bar&baz=snoopy")
  # returns {:foo => ''bar'', :baz =>
''snoopy''}


#code
class Hash
  def to_url_params
    elements = []
    keys.size.times do |i|
      elements << "#{keys[i]}=#{values[i]}"
    end
    elements.join(''&'')
  end

  def self.from_url_params(url_params)
    result = {}.with_indifferent_access
    url_params.split(''&'').each do |element|
      element = element.split(''='')
      result[element[0]] = element[1]
    end
    result
  end
end

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Alex Wayne wrote:
> Thanks for the location info, but it was only partially useful.  It gave 
> me some help writing my own methods, but since they are private in the 
> controller code they are innacessible.
Might be private, but I would just call them with send :-)

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You need to encode or you will get spaces in the strings...
class Hash
  def to_url_params
    elements = []
    keys.size.times do |i|
      elements <<
"#{CGI::escape(keys[i])}=#{CGI::escape(values[i])}"
    end
    elements.join(''&'')
  end

  def self.from_url_params(url_params)
    result = {}.with_indifferent_access
    url_params.split(''&'').each do |element|
      element = element.split(''='')
      result[element[0]] = element[1]
    end
    result
  end
end

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Marnen Laibow-Koser wrote in post #871670:
> Alex Wayne wrote:
>> I''m sure this is easy since rails does this internally, but I
need to
>> convert a string of url formatted variables
>> "foo=bar&baz=snoo&why=because" to a hash, and I need
to convert a hash
>> to url format.
>>
>> Now before I roll my own methods to do this, does rails expose this
>> functionality somehow?
>
> Hold it.  Why are you doing this in the first place?  If it''s part
of
> request processing or URL generation, Rails will already do it for you.
> I''m not sure why you''d need this directly; please
explain.
>
> Best,
> -- 
> Marnen Laibow-Koser
> http://www.marnen.org
> marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
I want to link to ''/auth/facebook'' with parameters but that
path is
handled by the omniauth gem and doesn''t appear in my routes file.

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