X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FResultSetColumn.pm;h=e26b6c2f3ab7ea2557ab1f90abb89ccb5b1f87de;hb=a2bd379666d729133d65c85dc775627937084b18;hp=b4707e63be35e7d5954eb94f2cbe994ff72dd087;hpb=7d3139ac1ff52213e2dad35fc9c9d1057711256a;p=dbsrgits%2FDBIx-Class.git diff --git a/lib/DBIx/Class/ResultSetColumn.pm b/lib/DBIx/Class/ResultSetColumn.pm index b4707e6..e26b6c2 100644 --- a/lib/DBIx/Class/ResultSetColumn.pm +++ b/lib/DBIx/Class/ResultSetColumn.pm @@ -4,9 +4,11 @@ use strict; use warnings; use base 'DBIx::Class'; +use DBIx::Class::Carp; +use DBIx::Class::_Util 'fail_on_internal_wantarray'; +use namespace::clean; -use Carp::Clan qw/^DBIx::Class/; -use DBIx::Class::Exception; +# not importing first() as it will clash with our own method use List::Util (); =head1 NAME @@ -46,6 +48,7 @@ sub new { my $orig_attrs = $rs->_resolved_attrs; my $alias = $rs->current_source_alias; + my $rsrc = $rs->result_source; # 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 @@ -56,22 +59,29 @@ sub new { my $as_index = List::Util::first { ($as_list->[$_] || "") eq $column } 0..$#$as_list; my $select = defined $as_index ? $select_list->[$as_index] : $column; + my $colmap; + for ($rsrc->columns, $column) { + if ($_ =~ /^ \Q$alias\E \. ([^\.]+) $ /x) { + $colmap->{$_} = $1; + } + elsif ($_ !~ /\./) { + $colmap->{"$alias.$_"} = $_; + $colmap->{$_} = $_; + } + } + my $new_parent_rs; # analyze the order_by, and see if it is done over a function/nonexistentcolumn # if this is the case we will need to wrap a subquery since the result of RSC # *must* be a single column select - my %collist = map - { $_ => 1, ($_ =~ /\./) ? () : ( "$alias.$_" => 1 ) } - ($rs->result_source->columns, $column) - ; if ( scalar grep - { ! $collist{$_} } - ( $rs->result_source->schema->storage->_extract_order_columns ($orig_attrs->{order_by} ) ) + { ! exists $colmap->{$_->[0]} } + ( $rsrc->schema->storage->_extract_order_criteria ($orig_attrs->{order_by} ) ) ) { # nuke the prefetch before collapsing to sql - my $subq_rs = $rs->search; - $subq_rs->{attrs}{join} = $subq_rs->_merge_attr( $subq_rs->{attrs}{join}, delete $subq_rs->{attrs}{prefetch} ); + my $subq_rs = $rs->search_rs; + $subq_rs->{attrs}{join} = $subq_rs->_merge_joinpref_attr( $subq_rs->{attrs}{join}, delete $subq_rs->{attrs}{prefetch} ); $new_parent_rs = $subq_rs->as_subselect_rs; } @@ -82,30 +92,17 @@ sub new { # rs via the _resolved_attrs trick - we need to retain the separation between # +select/+as and select/as. At the same time we want to preserve any joins that the # prefetch would otherwise generate. - $new_attrs->{join} = $rs->_merge_attr( $new_attrs->{join}, delete $new_attrs->{prefetch} ); + $new_attrs->{join} = $rs->_merge_joinpref_attr( $new_attrs->{join}, delete $new_attrs->{prefetch} ); # {collapse} would mean a has_many join was injected, which in turn means # we need to group *IF WE CAN* (only if the column in question is unique) - if (!$orig_attrs->{group_by} && keys %{$orig_attrs->{collapse}}) { - - # scan for a constraint that would contain our column only - that'd be proof - # enough it is unique - my $constraints = { $rs->result_source->unique_constraints }; - for my $constraint_columns ( values %$constraints ) { - - next unless @$constraint_columns == 1; - - my $col = $constraint_columns->[0]; - my $fqcol = join ('.', $new_attrs->{alias}, $col); + if (!$orig_attrs->{group_by} && $orig_attrs->{collapse}) { - if ($col eq $select or $fqcol eq $select) { - $new_attrs->{group_by} = [ $select ]; - delete $new_attrs->{distinct}; # it is ignored when group_by is present - last; - } + if ($colmap->{$select} and $rsrc->_identifying_column_set([$colmap->{$select}])) { + $new_attrs->{group_by} = [ $select ]; + delete @{$new_attrs}{qw(distinct _grouped_by_distinct)}; # it is ignored when group_by is present } - - if (!$new_attrs->{group_by}) { + else { carp ( "Attempting to retrieve non-unique column '$column' on a resultset containing " . 'one-to-many joins will return duplicate results.' @@ -113,8 +110,11 @@ sub new { } } - my $new = bless { _select => $select, _as => $column, _parent_resultset => $new_parent_rs }, $class; - return $new; + return bless { + _select => $select, + _as => $column, + _parent_resultset => $new_parent_rs + }, $class; } =head2 as_query @@ -123,7 +123,7 @@ sub new { =item Arguments: none -=item Return Value: \[ $sql, @bind ] +=item Return Value: \[ $sql, L<@bind_values|DBIx::Class::ResultSet/DBIC BIND VALUES> ] =back @@ -148,7 +148,7 @@ sub as_query { return shift->_resultset->as_query(@_) } Returns the next value of the column in the resultset (or C if there is none). -Much like L but just returning the +Much like L but just returning the one value. =cut @@ -176,7 +176,7 @@ Returns all values of the column in the resultset (or C if there are none). Much like L but returns values rather -than row objects. +than result objects. =cut @@ -291,7 +291,7 @@ sub min { =item Arguments: none -=item Return Value: $resultset +=item Return Value: L<$resultset|DBIx::Class::ResultSet> =back @@ -330,7 +330,7 @@ sub max { =item Arguments: none -=item Return Value: $resultset +=item Return Value: L<$resultset|DBIx::Class::ResultSet> =back @@ -369,7 +369,7 @@ sub sum { =item Arguments: none -=item Return Value: $resultset +=item Return Value: L<$resultset|DBIx::Class::ResultSet> =back @@ -406,6 +406,7 @@ sub func { my $cursor = $self->func_rs($function)->cursor; if( wantarray ) { + DBIx::Class::_ENV_::ASSERT_NO_INTERNAL_WANTARRAY and my $sog = fail_on_internal_wantarray; return map { $_->[ 0 ] } $cursor->all; } @@ -418,7 +419,7 @@ sub func { =item Arguments: $function -=item Return Value: $resultset +=item Return Value: L<$resultset|DBIx::Class::ResultSet> =back @@ -428,22 +429,29 @@ Creates the resultset that C uses to run its query. sub func_rs { my ($self,$function) = @_; - return $self->{_parent_resultset}->search( - undef, { - select => {$function => $self->{_select}}, - as => [$self->{_as}], - }, - ); + + my $rs = $self->{_parent_resultset}; + my $select = $self->{_select}; + + # wrap a grouped rs + if ($rs->_resolved_attrs->{group_by}) { + $select = $self->{_as}; + $rs = $rs->as_subselect_rs; + } + + $rs->search( undef, { + columns => { $self->{_as} => { $function => $select } } + } ); } =head2 throw_exception See L for details. -=cut +=cut sub throw_exception { - my $self=shift; + my $self = shift; if (ref $self && $self->{_parent_resultset}) { $self->{_parent_resultset}->throw_exception(@_); @@ -467,24 +475,47 @@ sub throw_exception { sub _resultset { my $self = shift; - return $self->{_resultset} ||= $self->{_parent_resultset}->search(undef, - { - select => [$self->{_select}], - as => [$self->{_as}] + return $self->{_resultset} ||= do { + + my $select = $self->{_select}; + + if ($self->{_parent_resultset}{attrs}{distinct}) { + my $alias = $self->{_parent_resultset}->current_source_alias; + my $rsrc = $self->{_parent_resultset}->result_source; + my %cols = map { $_ => 1, "$alias.$_" => 1 } $rsrc->columns; + + unless( $cols{$select} ) { + carp_unique( + 'Use of distinct => 1 while selecting anything other than a column ' + . 'declared on the primary ResultSource is deprecated (you selected ' + . "'$self->{_as}') - please supply an explicit group_by instead" + ); + + # collapse the selector to a literal so that it survives the distinct parse + # if it turns out to be an aggregate - at least the user will get a proper exception + # instead of silent drop of the group_by altogether + $select = \[ $rsrc->storage->sql_maker->_recurse_fields($select) ]; + } } - ); + + $self->{_parent_resultset}->search(undef, { + columns => { $self->{_as} => $select } + }); + }; } -1; +=head1 FURTHER QUESTIONS? -=head1 AUTHORS +Check the list of L. -Luke Saunders +=head1 COPYRIGHT AND LICENSE -Jess Robinson +This module is free software L +by the L. You can +redistribute it and/or modify it under the same terms as the +L. -=head1 LICENSE +=cut -You may distribute this code under the same terms as Perl itself. +1; -=cut