package DBIx::Class::ResultSet;
use strict;
use warnings;
use overload
'0+' => 'count',
fallback => 1;
use Data::Page;
sub new {
my ($it_class, $db_class, $attrs) = @_;
#use Data::Dumper; warn Dumper(@_);
$it_class = ref $it_class if ref $it_class;
$attrs = { %{ $attrs || {} } };
my %seen;
$attrs->{cols} ||= [ map { "me.$_" } $db_class->_select_columns ];
$attrs->{from} ||= [ { 'me' => $db_class->_table_name } ];
if ($attrs->{join}) {
foreach my $j (ref $attrs->{join} eq 'ARRAY'
? (@{$attrs->{join}}) : ($attrs->{join})) {
if (ref $j eq 'HASH') {
$seen{$_} = 1 foreach keys %$j;
} else {
$seen{$j} = 1;
}
}
push(@{$attrs->{from}}, $db_class->_resolve_join($attrs->{join}, 'me'));
}
foreach my $pre (@{$attrs->{prefetch} || []}) {
push(@{$attrs->{from}}, $db_class->_resolve_join($pre, 'me'))
unless $seen{$pre};
push(@{$attrs->{cols}},
map { "$pre.$_" }
$db_class->_relationships->{$pre}->{class}->_select_columns);
}
my $new = {
class => $db_class,
cols => $attrs->{cols} || [ $db_class->_select_columns ],
cond => $attrs->{where},
from => $attrs->{from} || $db_class->_table_name,
count => undef,
pager => undef,
attrs => $attrs };
bless ($new, $it_class);
$new->pager if ($attrs->{page});
return $new;
}
sub cursor {
my ($self) = @_;
my ($db_class, $attrs) = @{$self}{qw/class attrs/};
if ($attrs->{page}) {
$attrs->{rows} = $self->pager->entries_per_page;
$attrs->{offset} = $self->pager->skipped;
}
return $self->{cursor}
||= $db_class->storage->select($self->{from}, $self->{cols},
$attrs->{where},$attrs);
}
sub slice {
my ($self, $min, $max) = @_;
my $attrs = { %{ $self->{attrs} || {} } };
$self->{class}->throw("Can't slice without where") unless $attrs->{where};
$attrs->{offset} = $min;
$attrs->{rows} = ($max ? ($max - $min + 1) : 1);
my $slice = $self->new($self->{class}, $attrs);
return (wantarray ? $slice->all : $slice);
}
sub next {
my ($self) = @_;
my @row = $self->cursor->next;
return unless (@row);
return $self->_construct_object(@row);
}
sub _construct_object {
my ($self, @row) = @_;
my @cols = $self->{class}->_select_columns;
my $new;
unless ($self->{attrs}{prefetch}) {
$new = $self->{class}->_row_to_object(\@cols, \@row);
} else {
my @main = splice(@row, 0, scalar @cols);
$new = $self->{class}->_row_to_object(\@cols, \@main);
PRE: foreach my $pre (@{$self->{attrs}{prefetch}}) {
my $rel_obj = $self->{class}->_relationships->{$pre};
my @pre_cols = $rel_obj->{class}->columns;
my @vals = splice(@row, 0, scalar @pre_cols);
my $fetched = $rel_obj->{class}->_row_to_object(\@pre_cols, \@vals);
$self->{class}->throw("No accessor for prefetched $pre")
unless defined $rel_obj->{attrs}{accessor};
if ($rel_obj->{attrs}{accessor} eq 'single') {
foreach my $pri ($rel_obj->{class}->primary_columns) {
next PRE unless defined $fetched->get_column($pri);
}
$new->{_relationship_data}{$pre} = $fetched;
} elsif ($rel_obj->{attrs}{accessor} eq 'filter') {
$new->{_inflated_column}{$pre} = $fetched;
} else {
$self->{class}->throw("Don't know to to store prefetched $pre");
}
}
}
$new = $self->{attrs}{record_filter}->($new)
if exists $self->{attrs}{record_filter};
return $new;
}
sub count {
my ($self) = @_;
my $db_class = $self->{class};
my $attrs = { %{ $self->{attrs} } };
unless ($self->{count}) {
# offset and order by are not needed to count
delete $attrs->{$_} for qw/offset order_by/;
my @cols = 'COUNT(*)';
$self->{count} = $db_class->storage->select_single($self->{from}, \@cols,
$self->{cond}, $attrs);
}
return 0 unless $self->{count};
return $self->{pager}->entries_on_this_page if ($self->{pager});
return ( $attrs->{rows} && $attrs->{rows} < $self->{count} )
? $attrs->{rows}
: $self->{count};
}
sub all {
my ($self) = @_;
return map { $self->_construct_object(@$_); }
$self->cursor->all;
}
sub reset {
my ($self) = @_;
$self->cursor->reset;
return $self;
}
sub first {
return $_[0]->reset->next;
}
sub delete {
my ($self) = @_;
$_->delete for $self->all;
return 1;
}
*delete_all = \&delete; # Yeah, yeah, yeah ...
sub pager {
my ($self) = @_;
my $attrs = $self->{attrs};
delete $attrs->{offset};
my $rows_per_page = delete $attrs->{rows} || 10;
$self->{pager} ||= Data::Page->new(
$self->count, $rows_per_page, $attrs->{page} || 1);
$attrs->{rows} = $rows_per_page;
return $self->{pager};
}
sub page {
my ($self, $page) = @_;
my $attrs = $self->{attrs};
$attrs->{page} = $page;
return $self->new($self->{class}, $attrs);
}
1;