NAME Mad::Mapper - Map Perl objects to MySQL or PostgreSQL row data VERSION 0.01 DESCRIPTION Mad::Mapper is base class for objects that should be stored to the a persistent SQL database. Currently the supported backends are Mojo::Pg or Mojo::mysql, both which are optional dependencies. THIS MODULE IS EXPERIMENTAL! SYNOPSIS The synopsis is split into three parts: The two first is for model developers, and the last is for the developer using the models. Simple package MyApp::Model::User; use Mad::Mapper -base; # Class attributes col id => undef; col email => ''; Complex Instead of using the automatic generated methods from simple SQL statements, it is possible to do the complete query yourself. Below is the example of how the simple "_insert()" method above can be done complex: package MyApp::Model::User; use Mad::Mapper -base; sub _insert { my ($self, $cb) = @_; Mojo::IOLoop->delay( sub { my ($delay) = @_; $self->db->query("INSERT INTO users (email) VALUES (?)", $self->email, $delay->begin); }, sub { my ($delay, $err, $res) = @_; return $self->$cb($err) if $err; $self->in_storage(1); $self->id($res->sth->mysql_insertid); $self->$cb(""); }, ); } High level usage use Mojolicious::Lite; use MyApp::Model::User; use Mojo::Pg; my $pg = Mojo::Pg->new; helper model => sub { my $c = shift; my $model = "MyApp::Model::" .shift; return $model->new(db => $pg->db, @_); }; get "/profile" => sub { my $c = shift; my $user = $c->model(User => id => $c->session("uid")); $c->delay( sub { my ($delay) = @_; $user->load($delay->begin); }, sub { my ($delay, $err) = @_; return $self->render_exception($err) if $err; return $self->render(user => $user); }, ); }; post "/profile" => sub { my $c = shift; my $user = $c->model(User => id => $c->session("uid")); $c->delay( sub { my ($delay) = @_; $user->email($self->param("email")); $user->save($delay->begin); }, sub { my ($delay, $err) = @_; return $self->render_exception($err) if $err; return $self->render(user => $user); }, ); }; RELATIONSHIPS Currently one a basic "has_many" relationship is supported. TODO: "belongs_to()" to and maybe "has_one()". Has many Define a relationship: package MyApp::Model::User; use Mad::Mapper -base; has_many groups => "MyApp::Model::Group", "id_user"; Here "id_user" in the "groups" table should reference back to the primary key in the current table. Return Mojo::Collection of "MyApp::Model::Group" objects: $groups = $self->groups; Same, but async: $self = $self->groups(sub { my ($self, $err, $groups) = @_; ... }); Create a new "MyApp::Model::Group" object: $group = $self->add_group(\%constructor_args); $group->save; SUGAR col Used to define a column. Follow the same rules as "has". has has name => "Bruce"; has [qw(name email)]; has pet => sub { Cat->new }; Same as "has" in Mojo::Base. pk Used to define a primary key. Follow the same rules as "has". The primary key is used by default in "load" and "update" to update the correct row. If omitted, the first "col" will act as primary key. Note that "pk" is not returned by "columns". table Used to define a table name. The default is to use the last part of the class name and add "s" at the end, unless it already has "s" at the end. Examples: .----------------------------. | Class name | table | |-------------------|--------| | App::Model::User | users | | App::Model::Users | users | | App::Model::Group | groups | '----------------------------' ATTRIBUTES db $db = $self->db; $self->db($db_obj); Need to hold either a Mojo::Pg::Database or Mojo::mysql::Database object. in_storage $bool = $self->in_storage; $self = $self->in_storage($bool); METHODS expand_sst ($sst, @args) = $self->expand_sst($sst, @args); Used to expand a given $sst with variables defined by helpers. * %t Will be replaced by . Example: "SELECT * FROM %t" becomes "SELECT * FROM users". * %c Will be replaced by "columns". Example: "name,email". * %c= Will be replaced by "columns" assignment. Example: "name=?,email=?" * %c? Will be replaced by "columns" placeholders. Example: "?,?,?" * %pc Include "pk" in list of columns. Example: "id,name,email". * \%c Becomes a literal "%c". columns @str = $self->columns; Returns a list of columns, defined by "col". delete $self = $self->delete; $self = $self->delete(sub { my ($self, $err) = @_, ... }); Will delete the object from database if "in_storage". fresh $self = $self->fresh; Will mark the next relationship accessor to fetch new data from database, instead of using the cached data on $self. load $self = $self->load; $self = $class->load(sub { my ($self, $err) = @_; }); Used to fetch data from storage and update the object attributes. save $self = $self->save; $self = $self->save(sub { my ($self, $err) = @_, ... }); Will update the object in database if "in_storage" or insert it if not. import Will set up the caller class with Mad::Mapper functionality if "-base" is given as argument. See "SYNOPSIS" for example. COPYRIGHT AND LICENSE Copyright (C) 2014, Jan Henning Thorsen This program is free software, you can redistribute it and/or modify it under the terms of the Artistic License version 2.0. AUTHOR Jan Henning Thorsen - "jhthorsen@cpan.org"