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Dancer training at YAPC::NA
by Gabor Szabo 16 Apr '15

16 Apr '15

YAPC::NA is going to take place June 8-10 in Salt Lake City. http://www.yapcna.org/yn2015/ In addition to the 3 days of conference there are going to be 3 days of trainings and hackathons. One of the training classes is called "Programming the web with Dancer" and is given by Sawyer X and Mickey Nasriachi, two core developers of Dancer. In addition yours truly is going to give a 2-days long training course mostly about front-end development with some use of Dancer for the back-end. The list of all 6 master classes can be found here: http://www.yapcna.org/yn2015/masters.html Make sure you register before the class gets full or before you run out of the early-bird discount rate. Gabor

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JSON serializer, returning object instances form route handlers, convert_blessed
by John Barrett 16 Apr '15

16 Apr '15

Hey all, Usually in instances like this, I assume I am doing something wrong and am curious to know what it is... I would expect to be able to return any instance which implements TO_JSON directly from my route handler and have the JSON serializer (configured with convert_blessed => 1) pull its data from that method. This test app demonstrates what I am doing, I think. Visiting '/' gives me (pretty, demonstrating the config is read) JSON output. Visiting '/object' results in: Route exception: Unrecognized response type from route: AnObject. in ....perl5/lib/perl5/Return/MultiLevel.pm l. 97 package JsonTest; use Dancer2; set engines => { serializer => { JSON => { convert_blessed => 1, pretty => 1, } } }; set serializer => 'JSON'; get '/' => sub { { key => 'value', 'key2' => 'value2' }; }; get '/object' => sub { AnObject->new; }; package AnObject { use Moo; sub TO_JSON { { is => ref shift }; } } 1; I can, of course, call to_json/from_json with the appropriate options / headers myself (this works), but would like to take advantage of the convenience of the serializer. Thanks!

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Session Management with memcached in Dancer1
by Tushar Dave 16 Apr '15

16 Apr '15

Hello All, I am trying to learn session management in Dancer. I have consulted Dancer::Session documentation for the same. The document recommends to use memcached server for production and YAML or Simple for development. My question is specifically related to memcached server. Do I need to setup the memcached server on the system before using Dancer::Session::Memcached? Also, what does this "/var/sock/memcached" mean in the Dancer::Session::Memcached documentation (I believe it is the default location of memcached server after installation on local system)? I am sorry if my question is to silly. But I am trying to understand the right procedure. Thanks for the help. Best, Tushar Dave

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About template and main layout
by Kadir Beyazlı 08 Apr '15

08 Apr '15

Hi All, Because I am new at Dancer, I may be asking easy questions, sorry for this issue. I read document from following link and everything is clear for me : *https://metacpan.org/pod/Dancer2::Tutorial <https://metacpan.org/pod/Dancer2::Tutorial>* I understood full example which is located at the end of page. But I tried a very very simple example and it failed!. Here it is I have file called *test.pl <http://test.pl>* with very simple content: *MyApp/public/test.pl <http://test.pl> * *use Dancer2;use Template;set 'layout' => 'main';set 'template' => 'template_toolkit';get '/' => sub { "hello"};start;* When I run it and write *http://localhost:3000/ <http://localhost:3000/>* to browser I see word 'hello' but I don't see layout info of main.tt. Its content is below : *MyApp/views/layouts/main.tt <http://main.tt><!doctype html><html><head> <title>Test</title></head><body> <div> Before content [% content %] </div></body></html>* I expect to see yellow backgrounded word *"Before content"* but I don't see. Another problem is that I change code as follow: *MyApp/public/test.pl <http://test.pl> * *use Dancer2;use Template;set 'layout' => 'main';set 'template' => 'template_toolkit';get '/' => sub { template 'mytemplate.tt <http://mytemplate.tt>', { 'word' => 'test', };};start;* When I open web page I see error message, and at console there is following error message: */home/kadir/DancerExamples/willbe/public/views/mytemplate.tt <http://mytemplate.tt> is not a regular file or reference at /usr/local/share/perl/5.20.1/Dancer2/Core/Role/Template.pm line 126. in /usr/local/share/perl/5.20.1/Dancer2/Core/App.pm l. 1145[main:5105] error @2015-04-08 15:06:48> Route exception: /home/kadir/DancerExamples/willbe/public/views/mytemplate.tt <http://mytemplate.tt> is not a regular file or reference at /usr/local/share/perl/5.20.1/Dancer2/Core/Role/Template.pm line 126. in /usr/local/share/perl/5.20.1/Dancer2/Core/App.pm l. 1145* content of *mytemplate.tt <http://mytemplate.tt>* is very simple again *MyApp/views/mytemplate.tt <http://main.tt><div>[% word %]</div>* What is wrong ? *Kadir BeyazlıComputer Engineer* *GSM : +90 535 821 50 00 <%2B90%20535%20821%2050%2000>*

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About Route Handlers
by Kadir Beyazlı 03 Apr '15

03 Apr '15

Hi All, I am novice at Dancer, I am sure my question is very easy for you but I decided to ask because I failed at the beginning of my study. I started reading following manual : *https://metacpan.org/pod/Dancer2::Manual <https://metacpan.org/pod/Dancer2::Manual>* I installed Dancer2, placked up it and opened web page from localhost. Everything is OK until here. There is following info at manual: *The code block given to the route handler has to return a string which will be used as the content to render to the client.* It is clear for following example *get '/test1/:name' => sub { return "Hi there " . params->{name};};* because it returns a string and when I write *http://localhost:5000/test1/kadir <http://localhost:5000/test1/kadir> *to browser I see *Hi there kadir* which is the string I expect to see But next example is as follow: *get '/test2/:name' => sub { "Hey ".param('name').", welcome here!";};* It does not return anything. Because there is no *return* keyword *.* Despite this I see *Hi there kadir *when I write *http://localhost:5000/test2/kadir <http://localhost:5000/test2/kadir>* But above red background colored sentence says that it must return a value *?* Next example is stranger *:get '/test3/:name' => sub { "Hello there, " . defined param('name') ? param('name') : "whoever you are!";};* Again there is no *return* keyword. When I write *http://localhost:5000/test3/kadir <http://localhost:5000/test3/kadir> *I see only kadir. But at test2 example, I saw all words despite there is no return keyword. So what is rule? *-- * *Kadir BeyazlıComputer Engineer* *GSM : +90 535 821 50 00*

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Perl::Dancer Conference 2015
by Stefan Hornburg (Racke) 02 Apr '15

02 Apr '15

Hello Dancers, we are doing it again :-). Last year we had a lot of fun and amazing talks and trainings at the Perl::Dancer Conference 2014 in Hancock / NY (http://act.perl.dance/eic2014/) This year we are switching the location to Vienna, the very attractive capital of Austria. The conference is planned to have 1-2 days of training and 2 days of presentations. The dates are (still tentative) 19th-22th October. You can expect to meet some Dancer / Perl / Open Source luminaries at this event. Please let us know if you want to attend or help us with: * giving presentations * help with preparations * sponsorships Early feedback would help us to plan the event. Regards Racke -- Modern Perl, Dancer and eCommerce consulting.

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Re: [dancer-users] [Dancer2] Guide for Dancer2 developers (#785)
by Henk van Oers 31 Mar '15

31 Mar '15

On Tue, 31 Mar 2015, Sawyer X wrote: [...] > We can also remove a fair portion on how to submit a pull request by linking to the CPAN-PRC wiki guide I wrote on the topic. Can you post the link to this wiki? Thx, Henk

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serializer config
by Zahir Lalani 30 Mar '15

30 Mar '15

Hi The only info I can find on serializer configs for JSON in the yaml file, relates to the serializer: JSON. How does one configure the engine to enable allow_blessed from within the central config? Z

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Re: [dancer-users] [Dancer2-Plugin-DBIC] This plugin must be callable by other plugins (#9)
by Henk van Oers 23 Mar '15

23 Mar '15

https://github.com/ironcamel/Dancer2-Plugin-DBIC/pull/9#issuecomment-848124… >> Next is a patch to Dancer2::Plugin.pm to effectuate the use. > > Shouldn't the Dancer2::Plugin.pm changes happen first? The current (broken) Dancer2::Plugin.pm does nothing with this extra parameter and works like before. But see https://github.com/PerlDancer/Dancer2/pull/865 "We're currently trying to overhaul the entire plugin system. We have two competing implementations (one by @yanick and one by @veryrusty) and I hope we will be able to resolve them soon enough." That is very good news. I can stop working on D2 plugins and just wait.

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Memory use of Dancer2 running under Starman
by Andrew Beverley 20 Mar '15

20 Mar '15

Hi dancers, I'm trying to get an idea of what is a "normal" value in terms of memory use of Dancer2 running under Starman. I realise this is a "how long is a piece of string" question, but I would appreciate some replies to make a comparison. I'm finding it's roughly 100MB per worker, which seems to be roughly the case regardless of the application. What do other people's run at? Is there any way I can reduce the memory use and/or where should I look to do so? I'm running 10 different Dancer2 applications on a VPS with 4GB of memory. Each application has 2 Starman workers. This is about the limit of what I can run before the memory on the server tops out. I'd like to get more applications per server. The applications generally have fairly light-utilisation, but my VPS provider has disabled swap space, so they can't be swapped out when they're not being used unfortunately. Thanks, Andy

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