August 2015 - dancer-users - lists.preshweb.co.uk

Controller-hierarchy, best practise?
by Henk van Tijen || 06 Aug '15

06 Aug '15

Hi, perl programmer wannabee here;-) Hope this question is suited for this list. In the examples of Dancer apps I've seen there are no separate Controller classes. The sub() handlers of the routes act as a sort of mini- controllers in the examples of the documentation. But as I am starting on a project that would grow in size, I'd like use full controllers classes, like for a dashboard view that pulls in data from many data source. Where do I fit the controller classes hierarchy in? I’ve found his article http://fraley.de/2013/10/18/structuring-larger-dancer-applications/ that gives a starting point, the sample code is here https://github.com/pwfraley/DancerPrelaunch In the Fraley code, the idea of a central routes table is done away with. Instead, each controller defines its own routes it responds too. Good de-coupling practice, I suppose. But I like the default central MyDancer::App.pm package with a central routes table: - For one, it gives me in a glance an overview of all routes, the whole structure of the app. - But even more, it allows for constructs like ‘pass’ to group routes, conditionally skip routes (when not logged in or no session). - It provides a central lookaction for ‘hooks’ , process params, logging etc. (but a a base superclass Controller could be the place to do that too). On the examples of fraley.de , each controller has its own proper routes defined, but how do you combine that with the generics (loggedin, session, hooks, error) without repeating boiler plate code in each controller? To be more specific, I intend to structure my app along route definitions like: use MyDancer::Controller::FoobarController; get ‘/Foobar/jump’ => sub { my $fb = FoobarController->new; $fb->jump; }; Is this okay or ‘ugh’ ? Any more considerations or advice or pointers on how to organize a Dancer2 app with controller classes are welcome! ~henk

3 2

Some advice please on running with children etc...
by David H 06 Aug '15

06 Aug '15

Hi All, I'm running a Dancer2 app on a Windows 7 32bit machine in Cygwin (don't ask). The first thing I hope will be easy to give me advice on. The app is oddly crashing and I can't find the source of the issue but the app will be doing stuff and then suddenly just hang on the console and not go anywhere. Can I run Starman or Twiggy in such a way that there will be child processes so if the app hangs, there will be a child process to take over and serve the next request? I'm aware that MongoDB through Windows 32bit/Cygwin, isn't the most stable start to a web apps life, we are unfortunately stuck with this for the next week or two. It might last a few hours or an hour and then the app will hang. It doesn't totally crash. I'm guessing it may be something to do with the MongoDB driver but there is no error returned, the whole thing will just hang. I thought of something like Starman with --workers=10 might help? I'm currently running under Twiggy. Thanks in advance for your advice. nb. My versions of relevant stuff is: Dancer2: 0.161 MongoDB: v0.798.3.0 Twiggy: 0.1025 David

3 3

Looking for a hired hand
by Richard Reina 05 Aug '15

05 Aug '15

If anyone can help me with this please respond to me and let me know about how much you would charge. Thanks I am trying to learn dancer. Have played around with Dancer::Plugin::SimpleCRUD <https://metacpan.org/module/Dancer::Plugin::SimpleCRUD> and although I find it useful I can't find an example that applies specifically to what I want to learn. I am looking for an example app that: Brings a user to an index page similar to the "dancer -a" sample app but allows a user to either log in or else takes a user to template/page to create a minimal account (name, DOB, Gender, Email) which would result in them adding a record to a MySQL table. Once the user is created/logged in they could return to the index.tt page with their name appearing as they are logged in.

4 6

Need a CRUD kickstart
by Richard Reina 04 Aug '15

04 Aug '15

I am trying to learn dancer. Have played around with Dancer::Plugin::SimpleCRUD <https://metacpan.org/module/Dancer::Plugin::SimpleCRUD> and although I find it useful I can't find an example that applies specifically to what I want to learn. I am looking for an example app that: Brings a user to an index page similar to the "dancer -a" sample app but allows a user to either log in or else takes a user to template/page to create a minimal account (name, DOB, Gender, Email) which would result in them adding a record to a MySQL table. Once the user is created/logged in they could return to the index.tt page with their name appearing as they are logged in. Does anyone know where I can find such an example? Thanks

2 3

Template creation
by Richard Reina 04 Aug '15

04 Aug '15

Been trying to teach myself dancer over the last several days and have begun to grasp the basics of creating a very simple CRUD. However, I am beginning to realize that I need to know HTML. Would to best plance for some who does not know html be to simply copy index.tt, edit it to create templates? Or is there a better easier way? Thanks

3 3

Adding a second route to a simple crud.
by Richard Reina 03 Aug '15

03 Aug '15

When I do this it works.#!/usr/bin/perluse Dancer;use Dancer::Plugin::SimpleCRUD;# Simple example:simple_crud( record_title => 'Sponsor', prefix => '/sponsor', db_table => 'patron', editable => 1, deletable => 'no', sortable => 'yes', labels => { # More human-friendly labels for some columns ID => 'Player ID', first_name => 'First Name', last_name => 'Last Name', email => 'Email', }, );dance;But, when I add a second record/route --like below. The second one works but the first does not.richard@gemini:~$ wget -O - http://0.0.0:3000/sponsor--2015-08-03 09:19:22-- http://0.0.0:3000/sponsorResolving 0.0.0 (0.0.0)... 0.0.0.0Connecting to 0.0.0 (0.0.0)|0.0.0.0|:3000... connected.HTTP request sent, awaiting response... 404 Not Found2015-08-03 09:19:22 ERROR 404: Not Found.Any insight as to what I am doing wrong? Thanks.#!/usr/bin/perluse Dancer;use Dancer::Plugin::SimpleCRUD;# Simple example:simple_crud( record_title => 'Sponsor', prefix => '/sponsor', db_table => 'patron', editable => 1, deletable => 'no', sortable => 'yes', labels => { # More human-friendly labels for some columns ID => 'Player ID', first_name => 'First Name', last_name => 'Last Name', email => 'Email', }, record_title => 'Player', prefix => '/player', db_table => 'jugador', editable => 1, deletable => 'no', sortable => 'yes', labels => { # More human-friendly labels for some columns ID => 'Player ID', first_name => 'First Name', last_name => 'Last Name', SEX => 'Gender', email => 'Email', }, );dance;

2 2

Helping getting simple CRUD to dance
by Richard Reina 03 Aug '15

03 Aug '15

When I try to execute this app: #!/usr/bin/perl use Dancer; use Dancer::Plugin::SimpleCRUD; # Simple example: simple_crud( record_title => 'Player', prefix => '/player', db_table => 'jugador', editable => 1, ); dance; I get as my result in the browser: Error 404 Unable to process your query -- This is my config.yml file: plugins: Database: driver: 'mysql' database: 'my_main_DB' host: 'localhost' port: 3306 username: 'richard' password: 'mypass' #connection_check_threshold: 10 dbi_params: RaiseError: 1 AutoCommit: 1 on_connect_do: ["SET NAMES 'utf8'", "SET CHARACTER SET 'utf8'" ] log_queries: 1 Any help is greatly appreciated. Thank you

2 3