sub new {
my ($class, $rs, $column) = @_;
$class = ref $class if ref $class;
+
+ $rs->throw_exception("column must be supplied") unless $column;
+
my $new_parent_rs = $rs->search_rs; # we don't want to mess up the original, so clone it
- my $attrs = $new_parent_rs->_resolved_attrs;
- $new_parent_rs->{attrs}->{$_} = undef for qw(prefetch include_columns +select +as); # prefetch, include_columns, +select, +as cause additional columns to be fetched
+
+ # prefetch causes additional columns to be fetched, but we can not just make a new
+ # rs via the _resolved_attrs trick - we need to retain the separation between
+ # +select/+as and select/as
+ for my $attr (qw/prefetch collapse/) {
+ for (qw/attrs _attrs/) {
+ delete $new_parent_rs->{$_}{$attr} if ref $new_parent_rs->{$_};
+ }
+ }
# If $column can be found in the 'as' list of the parent resultset, use the
# corresponding element of its 'select' list (to keep any custom column
# definition set up with 'select' or '+select' attrs), otherwise use $column
# (to create a new column definition on-the-fly).
+ my $attrs = $new_parent_rs->_resolved_attrs;
+
my $as_list = $attrs->{as} || [];
my $select_list = $attrs->{select} || [];
my $as_index = List::Util::first { ($as_list->[$_] || "") eq $column } 0..$#$as_list;
my $select = defined $as_index ? $select_list->[$as_index] : $column;
my $new = bless { _select => $select, _as => $column, _parent_resultset => $new_parent_rs }, $class;
- $new->throw_exception("column must be supplied") unless $column;
return $new;
}
+=head2 as_query (EXPERIMENTAL)
+
+=over 4
+
+=item Arguments: none
+
+=item Return Value: \[ $sql, @bind ]
+
+=back
+
+Returns the SQL query and bind vars associated with the invocant.
+
+This is generally used as the RHS for a subquery.
+
+B<NOTE>: This feature is still experimental.
+
+=cut
+
+sub as_query { return shift->_resultset->as_query(@_) }
+
=head2 next
=over 4
return shift->func('MIN');
}
+=head2 min_rs
+
+=over 4
+
+=item Arguments: none
+
+=item Return Value: $resultset
+
+=back
+
+ my $rs = $year_col->min_rs();
+
+Wrapper for ->func_rs for function MIN().
+
+=cut
+
+sub min_rs { return shift->func_rs('MIN') }
+
=head2 max
=over 4
return shift->func('MAX');
}
+=head2 max_rs
+
+=over 4
+
+=item Arguments: none
+
+=item Return Value: $resultset
+
+=back
+
+ my $rs = $year_col->max_rs();
+
+Wrapper for ->func_rs for function MAX().
+
+=cut
+
+sub max_rs { return shift->func_rs('MAX') }
+
=head2 sum
=over 4
return shift->func('SUM');
}
+=head2 sum_rs
+
+=over 4
+
+=item Arguments: none
+
+=item Return Value: $resultset
+
+=back
+
+ my $rs = $year_col->sum_rs();
+
+Wrapper for ->func_rs for function SUM().
+
+=cut
+
+sub sum_rs { return shift->func_rs('SUM') }
+
=head2 func
=over 4
sub func {
my ($self,$function) = @_;
- my $cursor = $self->{_parent_resultset}->search(undef, {select => {$function => $self->{_select}}, as => [$self->{_as}]})->cursor;
+ my $cursor = $self->func_rs($function)->cursor;
if( wantarray ) {
return map { $_->[ 0 ] } $cursor->all;
return ( $cursor->next )[ 0 ];
}
+=head2 func_rs
+
+=over 4
+
+=item Arguments: $function
+
+=item Return Value: $resultset
+
+=back
+
+Creates the resultset that C<func()> uses to run its query.
+
+=cut
+
+sub func_rs {
+ my ($self,$function) = @_;
+ return $self->{_parent_resultset}->search(
+ undef, {
+ select => {$function => $self->{_select}},
+ as => [$self->{_as}],
+ },
+ );
+}
+
=head2 throw_exception
See L<DBIx::Class::Schema/throw_exception> for details.
);
}
-
1;
=head1 AUTHORS