1 package Maypole::Model::CDBI;
6 Maypole::Model::CDBI - Model class based on Class::DBI
10 This is a master model class which uses L<Class::DBI> to do all the hard
11 work of fetching rows and representing them as objects. It is a good
12 model to copy if you're replacing it with other database abstraction
15 It implements a base set of methods required for a Maypole Data Model.
17 It inherits accessor and helper methods from L<Maypole::Model::Base>.
19 When specified as the application model, it will use Class::DBI::Loader
20 to generate the model classes from the provided database. If you do not
21 wish to use this functionality, use L<Maypole::Model::CDBI::Plain> which
22 will instead use Class::DBI classes provided.
26 use base qw(Maypole::Model::Base Class::DBI);
27 #use Class::DBI::Plugin::Type;
28 use Class::DBI::Loader;
29 use Class::DBI::AbstractSearch;
30 use Class::DBI::Plugin::RetrieveAll;
31 use Class::DBI::Pager;
32 use Lingua::EN::Inflect::Number qw(to_PL);
35 use Maypole::Model::CDBI::AsForm;
36 use Maypole::Model::CDBI::FromCGI;
37 use CGI::Untaint::Maypole;
41 Set the class you use to untaint and validate form data
42 Note it must be of type CGI::Untaint::Maypole (takes $r arg) or CGI::Untaint
45 sub Untainter { 'CGI::Untaint::Maypole' };
49 #use Class::DBI::FromCGI;
51 #sub Untainter { 'CGI::Untaint' };
54 __PACKAGE__->mk_classdata($_) for (qw/COLUMN_INFO/);
58 Action methods are methods that are accessed through web (or other public) interface.
62 If there is an object in C<$r-E<gt>objects>, then it should be edited
63 with the parameters in C<$r-E<gt>params>; otherwise, a new object should
64 be created with those parameters, and put back into C<$r-E<gt>objects>.
65 The template should be changed to C<view>, or C<edit> if there were any
66 errors. A hash of errors will be passed to the template.
70 sub do_edit : Exported {
71 my ($self, $r, $obj) = @_;
73 my $config = $r->config;
74 my $table = $r->table;
76 # handle cancel button hit
77 if ( $r->{params}->{cancel} ) {
79 $r->objects( [$self->retrieve_all] );
83 my $required_cols = $config->{$table}{required_cols} || [];
84 my $ignored_cols = $config->{$table}{ignore_cols} || [];
86 ($obj, my $fatal, my $creating) = $self->_do_update_or_create($r, $obj, $required_cols, $ignored_cols);
88 # handle errors, if none, proceed to view the newly created/updated object
89 my %errors = $fatal ? (FATAL => $fatal) : $obj->cgi_update_errors;
92 # Set it up as it was:
93 $r->template_args->{cgi_params} = $r->params;
95 # replace user unfriendly error messages with something nicer
97 foreach (@{$config->{$table}->{required_cols}}) {
98 next unless ($errors{$_});
101 $r->template_args->{errors}{ucfirst($_)} = 'This field is required, please provide a valid value';
102 $r->template_args->{errors}{$key} = 'This field is required, please provide a valid value';
103 delete $errors{$key};
106 foreach (keys %errors) {
109 $r->template_args->{errors}{ucfirst($_)} = 'Please provide a valid value for this field';
110 $r->template_args->{errors}{$key} = 'Please provide a valid value for this field';
113 undef $obj if $creating;
115 die "do_update failed with error : $fatal" if ($fatal);
116 $r->template("edit");
118 $r->template("view");
123 $r->objects( $obj ? [$obj] : []);
126 # split out from do_edit to be reported by Mp::P::Trace
127 sub _do_update_or_create {
128 my ($self, $r, $obj, $required_cols, $ignored_cols) = @_;
133 my $h = $self->Untainter->new( %{$r->params} );
137 # We have something to edit
138 eval { $obj->update_from_cgi( $r => {
139 required => $required_cols,
140 ignore => $ignored_cols,
142 $obj->update(); # pos fix for bug 17132 'autoupdate required by do_edit'
147 $obj = $self->create_from_cgi( $r => {
148 required => $required_cols,
149 ignore => $ignored_cols,
155 return $obj, $fatal, $creating;
159 # split out from do_edit to be reported by Mp::P::Trace
160 #sub _do_update_or_create {
161 # my ($self, $r, $obj, $required_cols, $ignored_cols) = @_;
166 # my $h = $self->Untainter->new( %{$r->params} );
170 # # We have something to edit
171 # eval { $obj->update_from_cgi( $h => {
172 # required => $required_cols,
173 # ignore => $ignored_cols,
175 # $obj->update(); # pos fix for bug 17132 'autoupdate required by do_edit'
180 # $obj = $self->create_from_cgi( $h => {
181 # required => $required_cols,
182 # ignore => $ignored_cols,
189 # return $obj, $fatal, $creating;
194 Deprecated method that calls do_delete or a given classes delete method, please
195 use do_delete instead
199 Unsuprisingly, this command causes a database record to be forever lost.
201 This method replaces the, now deprecated, delete method provided in prior versions
205 sub delete : Exported {
207 my ($sub) = (caller(1))[3];
208 # So subclasses can still send delete down ...
209 $sub =~ /^(.+)::([^:]+)$/;
210 if ($1 ne "Maypole::Model::Base" && $2 ne "delete") {
211 $self->SUPER::delete(@_);
213 warn "Maypole::Model::CDBI delete method is deprecated\n";
214 $self->do_delete(@_);
219 my ( $self, $r ) = @_;
220 # FIXME: handle fatal error with exception
221 $_->SUPER::delete for @{ $r->objects || [] };
223 $r->objects( [ $self->retrieve_all ] );
224 $r->{template} = "list";
230 Deprecated searching method - use do_search instead.
234 This action method searches for database records, it replaces
235 the, now deprecated, search method previously provided.
239 sub search : Exported {
241 my ($sub) = (caller(1))[3];
242 $sub =~ /^(.+)::([^:]+)$/;
243 # So subclasses can still send search down ...
244 return ($1 ne "Maypole::Model::Base" && $2 ne "search") ?
245 $self->SUPER::search(@_) : $self->do_search(@_);
248 sub do_search : Exported {
249 my ( $self, $r ) = @_;
250 my %fields = map { $_ => 1 } $self->columns;
251 my $oper = "like"; # For now
252 my %params = %{ $r->{params} };
253 my %values = map { $_ => { $oper, $params{$_} } }
254 grep { defined $params{$_} && length ($params{$_}) && $fields{$_} }
257 $r->template("list");
258 if ( !%values ) { return $self->list($r) }
259 my $order = $self->order($r);
260 $self = $self->do_pager($r);
264 \%values, ( $order ? { order_by => $order } : () )
268 $r->{template_args}{search} = 1;
273 The C<list> method fills C<$r-E<gt>objects> with all of the
274 objects in the class. The results are paged using a pager.
278 sub list : Exported {
279 my ( $self, $r ) = @_;
280 my $order = $self->order($r);
281 $self = $self->do_pager($r);
283 $r->objects( [ $self->retrieve_all_sorted_by($order) ] );
286 $r->objects( [ $self->retrieve_all ] );
290 ###############################################################################
293 =head1 Helper Methods
298 This class method is passed the name of a model class that represensts a table
299 and allows the master model class to do any set-up required.
304 my ( $self, $child ) = @_;
305 $child->autoupdate(1);
306 if ( my $col = $child->stringify_column ) {
307 $child->columns( Stringify => $col );
314 This method returns a list of has-many accessors. A brewery has many
315 beers, so C<BeerDB::Brewery> needs to return C<beers>.
320 my ( $self, $r ) = @_;
321 return keys %{ $self->meta_info('has_many') || {} };
327 Given an accessor name as a method, this function returns the class this accessor returns.
332 my ( $self, $r, $accessor ) = @_;
333 my $meta = $self->meta_info;
334 my @rels = keys %$meta;
337 $related = $meta->{$_}{$accessor};
340 return unless $related;
342 my $mapping = $related->{args}->{mapping};
343 if ( $mapping and @$mapping ) {
344 return $related->{foreign_class}->meta_info('has_a')->{$$mapping[0]}->{foreign_class};
347 return $related->{foreign_class};
353 $class->related_meta($col);
355 Given a column associated with a relationship it will return the relatation
356 ship type and the meta info for the relationship on the column.
361 my ($self,$r, $accssr) = @_;
362 $self->_croak("You forgot to put the place holder for 'r' or forgot the accssr parameter") unless $accssr;
363 my $class_meta = $self->meta_info;
364 if (my ($rel_type) = grep { defined $class_meta->{$_}->{$accssr} }
366 { return $rel_type, $class_meta->{$rel_type}->{$accssr} };
371 =head2 stringify_column
373 Returns the name of the column to use when stringifying
378 sub stringify_column {
381 $class->columns("Stringify"),
382 ( grep { /^(name|title)$/i } $class->columns ),
383 ( grep { /(name|title)/i } $class->columns ),
384 ( grep { !/id$/i } $class->primary_columns ),
390 Sets the pager template argument ($r->{template_args}{pager})
391 to a Class::DBI::Pager object based on the rows_per_page
392 value set in the configuration of the application.
394 This pager is used via the pager macro in TT Templates, and
395 is also accessible via Mason.
400 my ( $self, $r ) = @_;
401 if ( my $rows = $r->config->rows_per_page ) {
402 return $r->{template_args}{pager} =
403 $self->pager( $rows, $r->query->{page} );
405 else { return $self }
411 Returns the SQL order syntax based on the order parameter passed
412 to the request, and the valid columns.. i.e. 'title ASC' or 'date_created DESC'.
414 $sql .= $self->order($r);
416 If the order column is not a column of this table,
417 or an order argument is not passed, then the return value is undefined.
419 Note: the returned value does not start with a space.
424 my ( $self, $r ) = @_;
425 my %ok_columns = map { $_ => 1 } $self->columns;
427 my $order = $q->{order};
428 return unless $order and $ok_columns{$order};
429 $order .= ' DESC' if $q->{o2} and $q->{o2} eq 'desc';
435 This method is inherited from Maypole::Model::Base and calls setup_database,
436 which uses Class::DBI::Loader to create and load Class::DBI classes from
437 the given database schema.
441 =head2 setup_database
443 The $opts argument is a hashref of options. The "options" key is a hashref of
444 Database connection options . Other keys may be various Loader arguments or
445 flags. It has this form:
447 # DB connection options
448 options { AutoCommit => 1 , ... },
457 my ( $class, $config, $namespace, $dsn, $u, $p, $opts ) = @_;
458 $dsn ||= $config->dsn;
459 $u ||= $config->user;
460 $p ||= $config->pass;
461 $opts ||= $config->opts;
463 warn "No DSN set in config" unless $dsn;
464 $config->loader || $config->loader(
465 Class::DBI::Loader->new(
466 namespace => $namespace,
473 $config->{classes} = [ $config->{loader}->classes ];
474 $config->{tables} = [ $config->{loader}->tables ];
476 my @table_class = map { $_ . " => " . $config->{loader}->_table2class($_) } @{ $config->{tables} };
477 warn( 'Loaded tables to classes: ' . join ', ', @table_class )
478 if $namespace->debug;
483 returns class for given table
488 my ( $self, $r, $table ) = @_;
489 return $r->config->loader->_table2class($table); # why not find_class ?
494 Returns 1 or more objects of the given class when provided with the request
500 my @pcs = $class->primary_columns;
503 @pks{@pcs}=(@{$r->{args}});
504 return $class->retrieve( %pks );
506 return $class->retrieve( $r->{args}->[0] );
515 Private method to return the class a column
516 belongs to that was inherited by an is_a relationship.
517 This should probably be public but need to think of API
522 my ($class, $col) = @_;
523 $class->_croak( "Need a column for _isa_class." ) unless $col;
525 my $isa = $class->meta_info("is_a") || {};
526 foreach ( keys %$isa ) {
527 $isaclass = $isa->{$_}->foreign_class;
528 return $isaclass if ($isaclass->find_column($col));
530 return; # col not in a is_a class
535 # Thanks to dave baird -- form builder for these private functions
538 my $dbh = $self->db_Main;
539 return $self->COLUMN_INFO if ref $self->COLUMN_INFO;
541 my $meta; # The info we are after
542 my ($catalog, $schema) = (undef, undef);
543 # Dave is suspicious this (above undefs) could
544 # break things if driver useses this info
546 # '%' is a search pattern for columns - matches all columns
547 if ( my $sth = $dbh->column_info( $catalog, $schema, $self->table, '%' ) )
549 $dbh->errstr && die "Error getting column info sth: " . $dbh->errstr;
550 $self->COLUMN_INFO( $self->_hash_type_meta( $sth ) );
551 # use Data::Dumper; warn "col info for typed is " . Dumper($self->COLUMN_INFO);
555 $self->COLUMN_INFO( $self->_hash_typeless_meta( ) );
556 # use Data::Dumper; warn "col info TYPELESS is " . Dumper($self->COLUMN_INFO);
558 return $self->COLUMN_INFO;
563 my ($self, $sth) = @_;
565 while ( my $row = $sth->fetchrow_hashref )
568 my ($col_meta, $col_name);
570 foreach my $key ( keys %$row)
572 my $value = $row->{$key} || $row->{ uc $key };
573 $col_meta->{$key} = $value;
574 $col_name = $row->{COLUMN_NAME} || $row->{column_name};
577 $meta->{$col_name} = $col_meta;
582 # typeless db e.g. sqlite
583 sub _hash_typeless_meta
587 $self->set_sql( fb_meta_dummy => 'SELECT * FROM __TABLE__ WHERE 1=0' )
588 unless $self->can( 'sql_fb_meta_dummy' );
590 my $sth = $self->sql_fb_meta_dummy;
592 $sth->execute or die "Error executing column info: " . $sth->errstr;;
594 # see 'Statement Handle Attributes' in the DBI docs for a list of available attributes
595 my $cols = $sth->{NAME};
596 my $types = $sth->{TYPE};
597 # my $sizes = $sth->{PRECISION}; # empty
598 # my $nulls = $sth->{NULLABLE}; # empty
600 # we haven't actually fetched anything from the sth, so need to tell DBI we're not going to
605 foreach my $col ( @$cols )
609 $col_meta->{NULLABLE} = 1;
611 # in my limited testing, the columns are returned in the same order as they were defined in the schema
612 $col_meta->{ORDINAL_POSITION} = $order++;
614 # type_name is taken literally from the schema, but is not actually used by sqlite,
615 # so it can be anything, e.g. varchar or varchar(xxx) or VARCHAR etc.
616 my $type = shift( @$types );
617 $type =~ /(\w+)\((\w+)\)/;
618 $col_meta->{type} = $type;
619 $col_meta->{TYPE_NAME} = $1;
621 $col_meta->{COLUMN_SIZE} = $size if $type =~ /(CHAR|INT)/i;
622 $meta->{$col} = $col_meta;
631 my $type = $class->column_type('column_name');
633 This returns the 'type' of this column (VARCHAR(20), BIGINT, etc.)
634 For now, it returns "BOOL" for tinyints.
636 TODO :: TEST with enums and postgres
641 my $col = shift or die "Need a column for column_type";
642 my $info = $class->_column_info->{$col} ||
643 eval { $class->_isa_class($col)->_column_info($col) } ||
646 my $type = $info->{mysql_type_name} || $info->{type};
648 $type = $info->{TYPE_NAME};
649 if ($info->{COLUMN_SIZE}) { $type .= "($info->{COLUMN_SIZE})"; }
652 if ($type and $type =~ /^tinyint/i and $info->{COLUMN_SIZE} == 1) {
658 =head2 column_nullable
660 Returns true if a column can be NULL and false if not.
664 sub column_nullable {
666 my $col = shift or $class->_croak( "Need a column for column_nullable" );
667 my $info = $class->_column_info->{$col} ||
668 eval { $class->_isa_class($col)->_column_info($col) } ||
670 return $info->{NULLABLE};
673 =head2 column_default
675 Returns default value for column or the empyty string.
676 Columns with NULL, CURRENT_TIMESTAMP, or Zeros( 0000-00...) for dates and times
683 my $col = shift or $class->_croak( "Need a column for column_default");
684 #return unless $class->find_column($col); # not a real column
686 my $info = $class->_column_info->{$col} ||
687 eval { $class->_isa_class($col)->_column_info($col) } ||
690 my $def = $info->{COLUMN_DEF};
691 $def = '' unless defined $def;
693 # exclude defaults we don't want to display-- may need some additions here
694 if ( $class->column_type($col) =~ /^BOOL/i ) {
695 $def = $def ? 1 : 0; # allow 0 or 1 for bool cols
698 $def = $def =~ /(^0000-00-00.*$|^0[0]*$|^0\.00$|CURRENT_TIMESTAMP|NULL)/i ? '' : $def ;
706 =head2 get_classmetadata
708 Gets class meta data *excluding cgi input* for the passed in class or the
709 calling class. *NOTE* excludes cgi inputs. This method is handy to call from
710 templates when you need some metadata for a related class.
714 sub get_classmetadata {
715 my ($self, $class) = @_; # class is class we want data for
717 $class = ref $class || $class;
721 $res{colnames} = {$class->column_names};
722 $res{columns} = [$class->display_columns];
723 $res{list_columns} = [$class->list_columns];
724 $res{moniker} = $class->moniker;
725 $res{plural} = $class->plural_moniker;
726 $res{table} = $class->table;