Yancy::Guides::Tutorial - Yancy's First Steps
version 1.072
Yancy is a content management system (CMS) for Mojolicious. It includes an admin application to edit content and tools to quickly build an application.
Yancy provides an application to edit content at the path /yancy on your website. Yancy can manage data in multiple databases using different backend modules. You can provide a URL string to tell Yancy how to connect to your database, or you can provide your database object. Yancy supports the following databases:
/yancy
PostgreSQL is supported through the Mojo::Pg module.
# PostgreSQL: A Mojo::Pg connection string plugin Yancy => backend => 'postgresql://postgres@/test'; # PostgreSQL: A Mojo::Pg object plugin Yancy => backend => Mojo::Pg->new( 'postgresql://postgres@/test' );
MySQL is supported through the Mojo::mysql module.
# MySQL: A Mojo::mysql connection string plugin Yancy => backend => 'mysql://user@/test'; # MySQL: A Mojo::mysql object plugin Yancy => backend => Mojo::mysql->strict_mode( 'mysql://user@/test' );
SQLite is supported through the Mojo::SQLite module. This is a good option if you want to try Yancy out.
# SQLite: A Mojo::SQLite connection string plugin Yancy => backend => 'sqlite:test.db'; # SQLite: A Mojo::SQLite object plugin Yancy => backend => Mojo::SQLite->new( 'sqlite::temp:' );
If you have a DBIx::Class schema, Yancy can use it to edit the content.
# DBIx::Class: A connection string plugin Yancy => backend => 'dbic://My::Schema/dbi:SQLite:test.db'; # DBIx::Class: A DBIx::Class::Schema object plugin Yancy => backend => My::Schema->connect( 'dbi:SQLite:test.db' );
Yancy scans your database to determine what kind of data is inside, but Yancy also accepts a JSON Schema to add more information about your data. You can add descriptions, examples, and other documentation that will appear in the admin application. You can also add type, format, and other validation information, which Yancy will use to validate input from users. See "Schema" in Yancy::Help::Config for how to define your schema.
plugin Yancy => backend => 'postgres://postgres@/test', schema => { employees => { title => 'Employees', description => 'Our crack team of loyal dregs.', properties => { address => { description => 'Where to notify next-of-kin.', # Regexp to validate this field pattern => '^\d+ \S+', }, email => { # Use the browser's native e-mail input format => 'email', }, }, }, };
Mojolicious::Plugin::Yancy provides helpers to work with your database content. These use the validations provided in the schema to validate user input. These helpers can be used in your route handlers to quickly add basic Create, Read, Update, and Delete (CRUD) functionality. See "HELPERS" in Mojolicious::Plugin::Yancy for a list of provided helpers.
# View a list of blog entries get '/' => sub( $c ) { my @blog_entries = $c->yancy->list( blog_entries => { published => 1 }, { order_by => { -desc => 'published_date' } }, ); $c->render( 'blog_list', items => \@blog_entries, ); }; # View a single blog entry get '/blog/:blog_entry_id' => sub( $c ) { my $blog_entry = $c->yancy->get( blog_entries => $c->param( 'blog_entry_id' ), ); $c->render( 'blog_entry', item => $blog_entry, ); };
The Yancy::Plugin::Form plugin can generate input fields or entire forms based on your schema information. The annotations in your schema appear in the forms to help users fill them out. Additionally, with the Yancy::Plugin::Form::Bootstrap4 module, Yancy can create forms using Twitter Bootstrap components.
# Load the form plugin app->yancy->plugin( 'Form::Bootstrap4' ); # Edit a blog entry any [ 'GET', 'POST' ], '/edit/:blog_entry_id' => sub( $c ) { if ( $c->req->method eq 'GET' ) { my $blog_entry = $c->yancy->get( blog_entries => $c->param( 'blog_entry_id' ), ); return $c->render( 'blog_entry', item => $blog_entry, ); } my $id = $c->param( 'blog_entry_id' ); my $item = $c->req->params->to_hash; delete $item->{csrf_token}; # See https://docs.mojolicious.org/Mojolicious/Guides/Rendering#Cross-site-request-forgery $c->yancy->set( blog_entries => $id, $c->req->params->to_hash ); $c->redirect_to( '/blog/' . $id ); }; __DATA__ @@ blog_form.html.ep %= $c->yancy->form->form_for( 'blog_entries', item => stash 'item' )
Yancy can add basic CRUD operations without writing the code yourself. The Yancy::Controller::Yancy module uses the schema information to show, search, edit, create, and delete database items.
# A rewrite of the routes above to use Yancy::Controller::Yancy # View a list of blog entries get '/' => { controller => 'yancy', action => 'list', schema => 'blog_entries', filter => { published => 1 }, order_by => { -desc => 'published_date' }, } => 'blog.list'; # View a single blog entry get '/blog/:blog_entry_id' => { controller => 'yancy', action => 'get', schema => 'blog_entries', } => 'blog.get'; # Load the form plugin app->yancy->plugin( 'Form::Bootstrap4' ); # Edit a blog entry any [ 'GET', 'POST' ], '/edit/:blog_entry_id' => { controller => 'yancy', action => 'set', schema => 'blog_entries', template => 'blog_form', redirect_to => 'blog.get', } => 'blog.edit'; __DATA__ @@ blog_form.html.ep %= $c->yancy->form->form_for( 'blog_entries' )
Yancy also has plugins for...
User authentication: Yancy::Plugin::Auth
File management: Yancy::Plugin::File
More development will be happening here soon!
Doug Bell <preaction@cpan.org>
This software is copyright (c) 2021 by Doug Bell.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
To install Yancy, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Yancy
CPAN shell
perl -MCPAN -e shell install Yancy
For more information on module installation, please visit the detailed CPAN module installation guide.