use Carp qw/croak/;
+use Storable;
+
use base qw/DBIx::Class/;
__PACKAGE__->load_components(qw/AccessorGroup/);
__PACKAGE__->mk_group_accessors('simple' =>
- qw/_ordered_columns _columns _primaries name resultset_class result_class schema from _relationships/);
+ qw/_ordered_columns _columns _primaries _unique_constraints name resultset_class result_class schema from _relationships/);
=head1 NAME
$class = ref $class if ref $class;
my $new = bless({ %{$attrs || {}} }, $class);
$new->{resultset_class} ||= 'DBIx::Class::ResultSet';
- $new->{_ordered_columns} ||= [];
- $new->{_columns} ||= {};
- $new->{_relationships} ||= {};
+ $new->{_ordered_columns} = [ @{$new->{_ordered_columns}||[]}];
+ $new->{_columns} = { %{$new->{_columns}||{}} };
+ $new->{_relationships} = { %{$new->{_relationships}||{}} };
$new->{name} ||= "!!NAME NOT SET!!";
return $new;
}
sub column_info {
my ($self, $column) = @_;
croak "No such column $column" unless exists $self->_columns->{$column};
+ if ( (! $self->_columns->{$column}->{data_type})
+ && $self->schema && $self->storage() ){
+ my $info;
+############ eval for the case of storage without table
+ eval{
+ $info = $self->storage->columns_info_for ( $self->from() );
+ };
+ if ( ! $@ ){
+ for my $col ( keys %{$self->_columns} ){
+ for my $i ( keys %{$info->{$col}} ){
+ $self->_columns()->{$col}->{$i} = $info->{$col}->{$i};
+ }
+ }
+ }
+ }
return $self->_columns->{$column};
}
my @column_names = $obj->columns;
Returns all column names in the order they were declared to add_columns
-
-=cut
+
+=cut
sub columns {
croak "columns() is a read-only accessor, did you mean add_columns()?" if (@_ > 1);
return @{shift->{_ordered_columns}||[]};
}
-=head2 set_primary_key(@cols)
-
+=head2 set_primary_key(@cols)
+
Defines one or more columns as primary key for this source. Should be
called after C<add_columns>.
-
-=cut
+
+Additionally, defines a unique constraint named C<primary>.
+
+=cut
sub set_primary_key {
my ($self, @cols) = @_;
unless $self->has_column($_);
}
$self->_primaries(\@cols);
+
+ $self->add_unique_constraint(primary => \@cols);
}
-=head2 primary_columns
-
+=head2 primary_columns
+
Read-only accessor which returns the list of primary keys.
-=cut
+=cut
sub primary_columns {
return @{shift->_primaries||[]};
}
+=head2 add_unique_constraint
+
+Declare a unique constraint on this source. Call once for each unique
+constraint.
+
+ # For e.g. UNIQUE (column1, column2)
+ __PACKAGE__->add_unique_constraint(constraint_name => [ qw/column1 column2/ ]);
+
+=cut
+
+sub add_unique_constraint {
+ my ($self, $name, $cols) = @_;
+
+ for (@$cols) {
+ $self->throw("No such column $_ on table ".$self->name)
+ unless $self->has_column($_);
+ }
+
+ my %unique_constraints = $self->unique_constraints;
+ $unique_constraints{$name} = $cols;
+ $self->_unique_constraints(\%unique_constraints);
+}
+
+=head2 unique_constraints
+
+Read-only accessor which returns the list of unique constraints on this source.
+
+=cut
+
+sub unique_constraints {
+ return %{shift->_unique_constraints||{}};
+}
+
=head2 from
Returns an expression of the source to be supplied to storage to specify
}
}
+=head2 resolve_prefetch (hashref/arrayref/scalar)
+
+Accepts one or more relationships for the current source and returns an
+array of column names for each of those relationships. Column names are
+prefixed relative to the current source, in accordance with where they appear
+in the supplied relationships. Examples:
+
+ my $source = $schema->$resultset('Tag')->source;
+ @columns = $source->resolve_prefetch( { cd => 'artist' } );
+
+ # @columns =
+ #(
+ # 'cd.cdid',
+ # 'cd.artist',
+ # 'cd.title',
+ # 'cd.year',
+ # 'cd.artist.artistid',
+ # 'cd.artist.name'
+ #)
+
+ @columns = $source->resolve_prefetch( qw[/ cd /] );
+
+ # @columns =
+ #(
+ # 'cd.cdid',
+ # 'cd.artist',
+ # 'cd.title',
+ # 'cd.year'
+ #)
+
+ $source = $schema->resultset('CD')->source;
+ @columns = $source->resolve_prefetch( qw[/ artist producer /] );
+
+ # @columns =
+ #(
+ # 'artist.artistid',
+ # 'artist.name',
+ # 'producer.producerid',
+ # 'producer.name'
+ #)
+
+=cut
+
+sub resolve_prefetch {
+ my( $self, $pre, $alias ) = @_;
+ use Data::Dumper;
+ #$alias ||= $self->name;
+ #warn $alias, Dumper $pre;
+ if( ref $pre eq 'ARRAY' ) {
+ return map { $self->resolve_prefetch( $_, $alias ) } @$pre;
+ }
+ elsif( ref $pre eq 'HASH' ) {
+ my @ret =
+ map {
+ $self->resolve_prefetch($_, $alias),
+ $self->related_source($_)->resolve_prefetch( $pre->{$_}, $_ )
+ }
+ keys %$pre;
+ #die Dumper \@ret;
+ return @ret;
+ }
+ elsif( ref $pre ) {
+ croak( "don't know how to resolve prefetch reftype " . ref $pre);
+ }
+ else {
+ my $rel_info = $self->relationship_info( $pre );
+ croak( $self->name . " has no such relationship '$pre'" ) unless $rel_info;
+ my $prefix = $alias && $alias ne 'me' ? "$alias.$pre" : $pre;
+ my @ret = map { "$prefix.$_" } $self->related_source($pre)->columns;
+ #warn $alias, Dumper (\@ret);
+ return @ret;
+ }
+}
=head2 related_source($relname)
sub related_source {
my ($self, $rel) = @_;
+ if( !$self->has_relationship( $rel ) ) {
+ croak "No such relationship '$rel'";
+ }
return $self->schema->source($self->relationship_info($rel)->{source});
}
projects / dbsrgits/DBIx-Class.git / blobdiff