How to extract URL parameters from a URL with Ruby or Rails

Question

I have some URLs  like  http   www example com something param1 value1 amp param2 value2 amp param3 value3   and I would like to extract the parameters from these URLs and get them in a Hash  Obviously  I could use regular expressions  but I was just wondering if there was easier ways to do that with Ruby or Rails  I haven t found anything in the Ruby module URI but perhaps I missed something   In fact  I need a method that would do that   extract parameters from url  http   www example com something param1 value1 amp param2 value2 amp param3 value3      gt    param1   gt   value1    param2   gt   value2    param3   gt   value3     Would you have some advices

User · Answer

For a pure Ruby solution combine URI parse with CGI parse  this can be used even if Rails Rack etc  are not required    CGI parse URI parse url  query       gt     name1    gt    value1     name2    gt    value1    value2

User · Answer

There more than one ways  to solve your problem  Others has shown you the some tricks  I know another trick  Here is my try  -  require  uri  url    http   www example com something param1 value1 amp param2 value2 amp param3 value3  uri   URI url      gt    lt URI  HTTP 0x89e4898 URL http   www example com something param1 value1 amp param2 value2 amp param3 value3 gt  URI  decode www form uri query  to h   if you are in 2 1 or later version of Ruby     gt    param1   gt  value1    param2   gt  value2    param3   gt  value3   Hash URI  decode www form uri query     if you are below 2 1 version of Ruby     gt    param1   gt  value1    param2   gt  value2    param3   gt  value3     Read the method docomentation of   decode www form

User · Answer

Check out the addressable gem - a popular replacement for Ruby s URI module that makes query parsing easy   require  addressable uri  uri   Addressable  URI parse  http   www example com something param1 value1 amp param2 value2 amp param3 value3   uri query values  param1     gt   value1     It also apparently handles param encoding decoding  unlike URI

User · Answer

Just Improved with Levi answer above -   Rack  Utils parse query URI  http   example com par hello amp par2 bye   query   For a string like above url  it will return     par    gt   hello    par2    gt   bye

User · Answer

I think you want to turn any given URL string into a HASH   You can try http   www ruby-doc org stdlib libdoc cgi rdoc classes CGI html M000075  require  cgi   CGI  parse  param1 value1 amp param2 value2 amp param3 value3     returns    param1   gt   value1     param2   gt   value2     param3   gt   value3

User · Answer

In your Controller  you should be able to access a dictionary  hash  called params  So  if you know what the names of each query parameter is  then just do params  param1  to access it    If you don t know what the names of the parameters are  you could traverse the dictionary and get the keys   Some simple examples here

User · Answer

I found myself needing the same thing for a recent project  Building on Levi s solution  here s a cleaner and faster method   Rack  Utils parse nested query  param1 value1 amp param2 value2 amp param3 value3      gt    param1   gt  value1    param2   gt  value2    param3   gt  value3

[ruby-on-rails] How to extract URL parameters from a URL with Ruby or Rails?

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