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----
-layout: post
-category: perl
-title: Easily create REST interface with the Dancer 1.170
----
-
-This week, with "Alexi":http://www.sukria.net/fr/'s help, "I've been working on":http://github.com/sukria/Dancer on adding auto-(de)serialization to Dancer's request. This features will be available in the next "Dancer":http://perldancer.org/ version, the 1.170 (which will be out before April).
-
-The basic idea was to provides to developer a simple way to access data that have been send in a serialized format, and to properly serialize the response.  
-
-At the moment, the supported serializers are :
-
- * Dancer::Serialize::JSON
- * Dancer::Serialize::YAML
- * Dancer::Serialize::XML
- * Dancer::Serialize::Mutable
-
-h3. Configuring an application to use the serializer
-
-To activate serialization in your application:
-
-{% highlight perl %}
-set serializer => 'JSON';
-{% endhighlight %}
-
-or in your configuration file:
-
-{% highlight yaml %}
-serializer: "JSON"
-{% endhighlight %}
-
-h3. A simple handler
-
-Let's create a new dancer application (you can fetch the source on "github":http://github.com/franckcuny/dancerREST :
-
-{% highlight bash %}
-dancer -a dancerREST
-cd dancerREST
-vim dancerREST.pm
-{% endhighlight %}
-
-then
-
-{% highlight perl %}
-package dancerREST;
-use Dancer ':syntax';
-
-my %users = ();
-
-post '/api/user/' => sub {
-    my $params = request->params;
-    if ($params->{name} && $params->{id}) {
-        if (exists $users{$params->{id}}) {
-            return {error => "user already exists"};
-        }
-        $users{$params->{id}} = {name => $params->{name}};
-        return {id => $params->{id}, name => $params->{name}};
-    }
-    else {
-        return {error => "name is missing"};
-    }
-};
-
-true;
-{% endhighlight %}
-
-We can test if everything works as expected:
-
-{% highlight bash %}
-plackup app.psgi &
-curl -H "Content-Type: application/json" -X POST http://localhost:5000/api/user/ -d '{"name":"foo","id":1}'
-# => {"name":"foo","id":"1"}
-{% endhighlight %}
-
-Now we add a method to fetch a list of users, and a method to get a
-specific user:
-
-{% highlight perl %}
-# return a specific user
-get '/api/user/:id' => sub {
-    my $params = request->params;
-    if (exists $users{$params->{id}}) {
-        return $users{$params->{id}};
-    }
-    else {
-        return {error => "unknown user"};
-    }
-};
-
-# return a list of users
-get '/api/user/' => sub {
-    my @users;
-    push @users, {name => $users{$_}->{name}, id => $_}
-        foreach keys %users;
-    return \@users;
-};
-{% endhighlight %}
-
-If we want to fetch the full list:
-
-bc. curl -H "Content-Type: application/json" http://localhost:5000/api/user/
-# => [{"name":"foo","id":"1"}]
-
-and a specific user:
-
-bc. curl -H "Content-Type: application/json" http://localhost:5000/api/user/1
-# => {"name":"foo"}
-
-h3. The mutable serializer
-
-The mutable serializer will try to load an appropriate serializer guessing from the *Content-Type* and *Accept-Type* header. You can also overload this by adding a *content_type=application/json* parameter to your request.
-
-While setting your serializer to mutable, your let your user decide which format they prefer between YAML, JSON and XML.
-
-h3. And the bonus
-
-Dancer provides now a new method to the request object : *is_ajax*. Now you can write something like
-
-{% highlight perl %}
-get '/user/:id' => sub {
-    my $params = request->params;
-    my $user   = $users{$params->{id}};
-    my $result;
-    if (!$user) {
-        _render_user({error => "unknown user"});
-    }
-    else {
-        _render_user($user);
-    }
-};
-
-sub _render_user {
-    my $result = shift;
-    if (request->is_ajax) {
-        return $result;
-    }
-    else {
-        template 'user.tt', $result;
-    }
-}
-{% endhighlight %}
-
-If we want to simulate an AJAX query:
-
-{% highlight bash %}
-curl -H "X-Requested-With: XMLHttpRequest" http://localhost:5000/user/1
-{% endhighlight %}
-
-and we will obtain our result in JSON. But we can also test without the X-Requested-With:
-
-{% highlight bash %}
-curl http://localhost:5000/user/1
-{% endhighlight %}
-
-and the template will be rendered.
-
-Hope you like this new features. I've also been working on something similar for "Tatsumaki":http://github.com/miyagawa/tatsumaki.