use json as format instead of xml

Use format json instead of xml. The reason is that Hash.form_xml() does not produce conistent results.

Examples:

1) xml response of a collection with a single user:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<list available="21" end="21" start="20" type="users" uri="/CyberCoachServer/resources/users/">      
    <links>
       <link description="previous" href="/CyberCoachServer/resources/users/?start=15&amp;size=5"/>  
    </links>
    <users>
           <user username="timon" uri="/CyberCoachServer/resources/users/timon/"/>
    </users>
</list>

Hash.from_xml produces:

 {
     "list" => {
                     "available"=>"21", 
                     "end"=>"21", 
                     "start"=>"20", 
                     "type"=>"users", 
                      "uri"=>"/CyberCoachServer/resources/users/", 
                      "links"=>  {
                                          "link"=> 
                                                      {   
                                                          "description" =>"previous", 
                                                            "href"=>"/CyberCoachServer/resources/users/?start=15&size=5"
                                                       }
                                       },
                       "users"=> { 
                                           "user"=> {
                                                             "username"=>"timon",               
                                                             "uri"=>"/CyberCoachServer/resources/users/timon/"
                                                          }
                                        }
                     }
}

2) xml response of a collection with multiple uses:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
        <list available="21" end="20" start="15" type="users" uri="/CyberCoachServer/resources/users/">  
               <links>
                        <link description="next" href="/CyberCoachServer/resources/users/?start=20&amp;size=5"/>
                        <link description="previous" href="/CyberCoachServer/resources/users/?start=10&amp;size=5"/>
               </links>
               <users>
                        <user username="newyorkfalconstest2" uri="/CyberCoachServer/resources/users/newyorkfalconstest2/"/>
                        <user username="newyorkfalconstest4" uri="/CyberCoachServer/resources/users/newyorkfalconstest4/"/>
                        <user username="polchky" uri="/CyberCoachServer/resources/users/polchky/"/>
                        <user username="test" uri="/CyberCoachServer/resources/users/test/"/>
                        <user username="testtest" uri="/CyberCoachServer/resources/users/testtest/"/>    
               </users>
</list>

Hash.from_xml produces:

{    "list"=>  { 
                        "available"=>"21", 
                        "end"=>"20", 
                        "start"=>"15", 
                        "type"=>"users", 
                         "uri"=>"/CyberCoachServer/resources/users/", 
                         "links"=> {  
                                        "link"=>[
                                                      {"description"=>"next", "href"=>"/CyberCoachServer/resources/users/?start=20&size=5"}, 
                                                       {"description"=>"previous", "href"=>"/CyberCoachServer/resources/users/?start=10&size=5"}
                                                    ]
                                          }, 
                           "users"=> {
                                               "user"=> [
                                                                  { "username"=>"newyorkfalconstest2",                                                                      
                                                             "uri"=>"/CyberCoachServer/resources/users/newyorkfalconstest2/"}, 
                                                                  { "username"=>"newyorkfalconstest4", 
                                                                "uri"=>"/CyberCoachServer/resources/users/newyorkfalconstest4/"}, 
                                                                  { "username"=>"polchky", 
                                                                            "uri"=>"/CyberCoachServer/resources/users/polchky/"}, 
                                                                     { "username"=>"test", 
                                                                       "uri"=>"/CyberCoachServer/resources/users/test/"}, 
                                                                     { "username"=>"testtest", 
                                                                        "uri"=>"/CyberCoachServer/resources/users/testtest/"}
                                                                  ]
                                            }
                      }
}

In the first example hash['list']['users']['user'] is a hash and in the second example hash['list']['users']['user'] is a list.

Bergrebell / CyberCoach

use json as format instead of xml #21