use strict;
use warnings;
+use base qw/DBIx::Class::ResultSource::RowParser DBIx::Class/;
+
use DBIx::Class::ResultSet;
use DBIx::Class::ResultSourceHandle;
-use DBIx::Class::Exception;
use DBIx::Class::Carp;
use Devel::GlobalDestruction;
use Try::Tiny;
use List::Util 'first';
use Scalar::Util qw/blessed weaken isweak/;
-use namespace::clean;
+use Data::Query::ExprHelpers;
-use base qw/DBIx::Class/;
+use namespace::clean;
__PACKAGE__->mk_group_accessors(simple => qw/
source_name name source_info
=head2 Finding result source objects
As mentioned above, a result source instance is created and stored for
-you when you define a L<Result Class|DBIx::Class::Manual::Glossary/Result Class>.
+you when you define a L<result class|DBIx::Class::Manual::Glossary/Result class>.
You can retrieve the result source at runtime in the following ways:
=item From a Result object:
- $row->result_source;
+ $result->result_source;
=item From a ResultSet object:
}
else {
$self->throw_exception( sprintf (
- "No such column '%s' on source %s",
+ "No such column '%s' on source '%s'",
$_,
- $self->source_name,
+ $self->source_name || $self->name || 'Unknown source...?',
));
}
}
sub set_primary_key {
my ($self, @cols) = @_;
- # check if primary key columns are valid columns
- foreach my $col (@cols) {
- $self->throw_exception("No such column $col on table " . $self->name)
- unless $self->has_column($col);
+
+ my $colinfo = $self->columns_info(\@cols);
+ for my $col (@cols) {
+ carp_unique(sprintf (
+ "Primary key of source '%s' includes the column '%s' which has its "
+ . "'is_nullable' attribute set to true. This is a mistake and will cause "
+ . 'various Result-object operations to fail',
+ $self->source_name || $self->name || 'Unknown source...?',
+ $col,
+ )) if $colinfo->{$col}{is_nullable};
}
+
$self->_primaries(\@cols);
$self->add_unique_constraint(primary => \@cols);
# a helper method that will automatically die with a descriptive message if
# no pk is defined on the source in question. For internal use to save
# on if @pks... boilerplate
-sub _pri_cols {
+sub _pri_cols_or_die {
my $self = shift;
my @pcols = $self->primary_columns
or $self->throw_exception (sprintf(
return @pcols;
}
+# same as above but mandating single-column PK (used by relationship condition
+# inferrence)
+sub _single_pri_col_or_die {
+ my $self = shift;
+ my ($pri, @too_many) = $self->_pri_cols_or_die;
+
+ $self->throw_exception( sprintf(
+ "Operation requires a single-column primary key declared on '%s'",
+ $self->source_name || $self->result_class || $self->name || 'Unknown source...?',
+ )) if @too_many;
+ return $pri;
+}
+
+
=head2 sequence
Manually define the correct sequence for your table, to avoid the overhead
=over 4
-=item Arguments: \%attrs
+=item Arguments: L<\%attrs|DBIx::Class::ResultSet/ATTRIBUTES>
-=item Return Value: \%attrs
+=item Return Value: L<\%attrs|DBIx::Class::ResultSet/ATTRIBUTES>
=back
$source->resultset_attributes({ order_by => [ 'id' ] });
Store a collection of resultset attributes, that will be set on every
-L<DBIx::Class::ResultSet> produced from this result source. For a full
-list see L<DBIx::Class::ResultSet/ATTRIBUTES>.
+L<DBIx::Class::ResultSet> produced from this result source.
+
+B<CAVEAT>: C<resultset_attributes> comes with its own set of issues and
+bugs! While C<resultset_attributes> isn't deprecated per se, its usage is
+not recommended!
+
+Since relationships use attributes to link tables together, the "default"
+attributes you set may cause unpredictable and undesired behavior. Furthermore,
+the defaults cannot be turned off, so you are stuck with them.
+
+In most cases, what you should actually be using are project-specific methods:
+
+ package My::Schema::ResultSet::Artist;
+ use base 'DBIx::Class::ResultSet';
+ ...
+
+ # BAD IDEA!
+ #__PACKAGE__->resultset_attributes({ prefetch => 'tracks' });
+
+ # GOOD IDEA!
+ sub with_tracks { shift->search({}, { prefetch => 'tracks' }) }
+
+ # in your code
+ $schema->resultset('Artist')->with_tracks->...
+
+This gives you the flexibility of not using it when you don't need it.
+
+For more complex situations, another solution would be to use a virtual view
+via L<DBIx::Class::ResultSource::View>.
=cut
=cut
sub relationship_info {
- my ($self, $rel) = @_;
- return $self->_relationships->{$rel};
+ #my ($self, $rel) = @_;
+ return shift->_relationships->{+shift};
}
=head2 has_relationship
=cut
sub has_relationship {
- my ($self, $rel) = @_;
- return exists $self->_relationships->{$rel};
+ #my ($self, $rel) = @_;
+ return exists shift->_relationships->{+shift};
}
=head2 reverse_relationship_info
my $ret = {};
- return $ret unless ((ref $rel_info->{cond}) eq 'HASH');
-
my $stripped_cond = $self->__strip_relcond ($rel_info->{cond});
- my $rsrc_schema_moniker = $self->source_name
- if try { $self->schema };
+ return $ret unless $stripped_cond;
+
+ my $registered_source_name = $self->source_name;
# this may be a partial schema or something else equally esoteric
- my $other_rsrc = try { $self->related_source($rel) }
- or return $ret;
+ my $other_rsrc = $self->related_source($rel);
# Get all the relationships for that source that related to this source
# whose foreign column set are our self columns on $rel and whose self
my $roundtrip_rsrc = try { $other_rsrc->related_source($other_rel) }
or next;
- if ($rsrc_schema_moniker and try { $roundtrip_rsrc->schema } ) {
- next unless $rsrc_schema_moniker eq $roundtrip_rsrc->source_name;
+ if ($registered_source_name) {
+ next if $registered_source_name ne ($roundtrip_rsrc->source_name || '')
}
else {
- next unless $self->result_class eq $roundtrip_rsrc->result_class;
+ next if $self->result_class ne $roundtrip_rsrc->result_class;
}
my $other_rel_info = $other_rsrc->relationship_info($other_rel);
# this can happen when we have a self-referential class
next if $other_rel_info eq $rel_info;
- next unless ref $other_rel_info->{cond} eq 'HASH';
my $other_stripped_cond = $self->__strip_relcond($other_rel_info->{cond});
+ next unless $other_stripped_cond;
+
$ret->{$other_rel} = $other_rel_info if (
$self->_compare_relationship_keys (
[ keys %$stripped_cond ], [ values %$other_stripped_cond ]
return $ret;
}
+sub _join_condition_to_hashref {
+ my ($self, $dq) = @_;
+ my (@q, %found) = ($dq);
+ Q: while (my $n = shift @q) {
+ if (is_Operator($n)) {
+ if (($n->{operator}{Perl}||'') =~ /^(?:==|eq)$/) {
+ my ($l, $r) = @{$n->{args}};
+ if (
+ is_Identifier($l) and @{$l->{elements}} == 2
+ and is_Identifier($r) and @{$r->{elements}} == 2
+ ) {
+ ($l, $r) = ($r, $l) if $l->{elements}[0] eq 'self';
+ if (
+ $l->{elements}[0] eq 'foreign'
+ and $r->{elements}[0] eq 'self'
+ ) {
+ $found{$l->{elements}[1]} = $r->{elements}[1];
+ next Q;
+ }
+ }
+ } elsif (($n->{operator}{Perl}||'') eq 'and') {
+ push @q, @{$n->{args}};
+ next Q;
+ }
+ }
+ # didn't match as 'and' or 'foreign.x = self.y', can't handle this
+ return undef;
+ }
+ return keys %found ? \%found : undef;
+}
+
# all this does is removes the foreign/self prefix from a condition
sub __strip_relcond {
- +{
- map
- { map { /^ (?:foreign|self) \. (\w+) $/x } ($_, $_[1]{$_}) }
- keys %{$_[1]}
+ if (ref($_[1]) eq 'HASH') {
+ return +{
+ map
+ { map { /^ (?:foreign|self) \. (\w+) $/x } ($_, $_[1]{$_}) }
+ keys %{$_[1]}
+ };
+ } elsif (blessed($_[1]) and $_[1]->isa('Data::Query::ExprBuilder')) {
+ return $_[0]->_join_condition_to_hashref($_[1]->{expr});
}
+ return undef;
}
-sub compare_relationship_keys {
- carp 'compare_relationship_keys is a private method, stop calling it';
- my $self = shift;
- $self->_compare_relationship_keys (@_);
+sub _extract_fixed_values_for {
+ my ($self, $dq, $alias) = @_;
+ my $fixed = $self->_extract_fixed_conditions_for($dq, $alias);
+ return +{ map {
+ is_Value($fixed->{$_})
+ ? ($_ => $fixed->{$_}{value})
+ : (is_Literal($fixed->{$_}) ? ($_ => \($fixed->{$_})) : ())
+ } keys %$fixed };
+}
+
+sub _extract_fixed_conditions_for {
+ my ($self, $dq, $alias) = @_;
+ my (@q, %found) = ($dq);
+ foreach my $n ($self->_extract_top_level_conditions($dq)) {
+ if (
+ is_Operator($n)
+ and (
+ ($n->{operator}{Perl}||'') =~ /^(?:==|eq)$/
+ or ($n->{operator}{'SQL.Naive'}||'') eq '='
+ )
+ ) {
+ my ($l, $r) = @{$n->{args}};
+ if (
+ is_Identifier($r) and (
+ !$alias
+ or (@{$r->{elements}} == 2
+ and $r->{elements}[0] eq $alias)
+ )
+ ) {
+ ($l, $r) = ($r, $l);
+ }
+ if (
+ is_Identifier($l) and (
+ !$alias
+ or (@{$l->{elements}} == 2
+ and $l->{elements}[0] eq $alias)
+ )
+ ) {
+ $found{$alias ? $l->{elements}[1] : join('.',@{$l->{elements}})} = $r;
+ }
+ }
+ }
+ return \%found;
+}
+
+sub _extract_top_level_conditions {
+ my ($self, $dq) = @_;
+ my (@q, @found) = ($dq);
+ while (my $n = shift @q) {
+ if (
+ is_Operator($n)
+ and ($n->{operator}{Perl}||$n->{operator}{'SQL.Naive'}||'') =~ /^and$/i
+ ) {
+ push @q, @{$n->{args}};
+ } else {
+ push @found, $n;
+ }
+ }
+ return @found;
}
# Returns true if both sets of keynames are the same, false otherwise.
,
-join_path => [@$jpath, { $join => $as } ],
-is_single => (
- $rel_info->{attrs}{accessor}
- &&
+ (! $rel_info->{attrs}{accessor})
+ or
first { $rel_info->{attrs}{accessor} eq $_ } (qw/single filter/)
),
-alias => $as,
- -relation_chain_depth => $seen->{-relation_chain_depth} || 0,
+ -relation_chain_depth => ( $seen->{-relation_chain_depth} || 0 ) + 1,
},
scalar $self->_resolve_condition($rel_info->{cond}, $as, $alias, $join)
];
}
}
-sub pk_depends_on {
- carp 'pk_depends_on is a private method, stop calling it';
- my $self = shift;
- $self->_pk_depends_on (@_);
-}
-
# Determines whether a relation is dependent on an object from this source
# having already been inserted. Takes the name of the relationship and a
# hashref of columns of the related object.
if exists ($relinfo->{attrs}{is_foreign_key_constraint});
my $cond = $relinfo->{cond};
- return 0 unless ref($cond) eq 'HASH';
-
- # map { foreign.foo => 'self.bar' } to { bar => 'foo' }
- my $keyhash = { map { my $x = $_; $x =~ s/.*\.//; $x; } reverse %$cond };
+ my $keyhash = do {
+ if (ref($cond) eq 'HASH') {
+
+ # map { foreign.foo => 'self.bar' } to { bar => 'foo' }
+ +{ map { my $x = $_; $x =~ s/.*\.//; $x; } reverse %$cond };
+ } elsif (ref($cond) eq 'REF' and ref($$cond) eq 'HASH') {
+ my $fixed = $self->_join_condition_to_hashref($$cond);
+ return 0 unless $fixed;
+ +{ reverse %$fixed };
+ } else {
+ return 0;
+ }
+ };
# assume anything that references our PK probably is dependent on us
# rather than vice versa, unless the far side is (a) defined or (b)
return 1;
}
-sub resolve_condition {
- carp 'resolve_condition is a private method, stop calling it';
- my $self = shift;
- $self->_resolve_condition (@_);
-}
+our $UNRESOLVABLE_CONDITION = \Literal(SQL => '1 = 0');
-our $UNRESOLVABLE_CONDITION = \ '1 = 0';
+${$UNRESOLVABLE_CONDITION}->{'DBIx::Class::ResultSource.UNRESOLVABLE'} = 1;
# Resolves the passed condition to a concrete query fragment and a flag
# indicating whether this is a cross-table condition. Also an optional
-# list of non-triviail values (notmally conditions) returned as a part
+# list of non-trivial values (normally conditions) returned as a part
# of a joinfree condition hash
sub _resolve_condition {
my ($self, $cond, $as, $for, $rel_name) = @_;
- my $obj_rel = !!blessed $for;
+ my $obj_rel = defined blessed $for;
if (ref $cond eq 'CODE') {
my $relalias = $obj_rel ? 'me' : $as;
}
return wantarray ? (\@ret, $crosstable) : \@ret;
}
- else {
- $self->throw_exception ("Can't handle condition $cond for relationship '$rel_name' yet :(");
- }
-}
-
-# 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.
-sub _resolve_prefetch {
- my ($self, $pre, $alias, $alias_map, $order, $collapse, $pref_path) = @_;
- $pref_path ||= [];
-
- if (not defined $pre or not length $pre) {
- return ();
- }
- elsif( ref $pre eq 'ARRAY' ) {
- return
- map { $self->_resolve_prefetch( $_, $alias, $alias_map, $order, $collapse, [ @$pref_path ] ) }
- @$pre;
- }
- elsif( ref $pre eq 'HASH' ) {
- my @ret =
- map {
- $self->_resolve_prefetch($_, $alias, $alias_map, $order, $collapse, [ @$pref_path ] ),
- $self->related_source($_)->_resolve_prefetch(
- $pre->{$_}, "${alias}.$_", $alias_map, $order, $collapse, [ @$pref_path, $_] )
- } keys %$pre;
- return @ret;
- }
- elsif( ref $pre ) {
- $self->throw_exception(
- "don't know how to resolve prefetch reftype ".ref($pre));
- }
- else {
- my $p = $alias_map;
- $p = $p->{$_} for (@$pref_path, $pre);
-
- $self->throw_exception (
- "Unable to resolve prefetch '$pre' - join alias map does not contain an entry for path: "
- . join (' -> ', @$pref_path, $pre)
- ) if (ref $p->{-join_aliases} ne 'ARRAY' or not @{$p->{-join_aliases}} );
-
- my $as = shift @{$p->{-join_aliases}};
-
- my $rel_info = $self->relationship_info( $pre );
- $self->throw_exception( $self->source_name . " has no such relationship '$pre'" )
- unless $rel_info;
- my $as_prefix = ($alias =~ /^.*?\.(.+)$/ ? $1.'.' : '');
- my $rel_source = $self->related_source($pre);
-
- if ($rel_info->{attrs}{accessor} && $rel_info->{attrs}{accessor} eq 'multi') {
- $self->throw_exception(
- "Can't prefetch has_many ${pre} (join cond too complex)")
- unless ref($rel_info->{cond}) eq 'HASH';
- my $dots = @{[$as_prefix =~ m/\./g]} + 1; # +1 to match the ".${as_prefix}"
-
- if (my ($fail) = grep { @{[$_ =~ m/\./g]} == $dots }
- keys %{$collapse}) {
- my ($last) = ($fail =~ /([^\.]+)$/);
- carp (
- "Prefetching multiple has_many rels ${last} and ${pre} "
- .(length($as_prefix)
- ? "at the same level (${as_prefix}) "
- : "at top level "
- )
- . 'will explode the number of row objects retrievable via ->next or ->all. '
- . 'Use at your own risk.'
- );
- }
-
- #my @col = map { (/^self\.(.+)$/ ? ("${as_prefix}.$1") : ()); }
- # values %{$rel_info->{cond}};
- $collapse->{".${as_prefix}${pre}"} = [ $rel_source->_pri_cols ];
- # action at a distance. prepending the '.' allows simpler code
- # in ResultSet->_collapse_result
- my @key = map { (/^foreign\.(.+)$/ ? ($1) : ()); }
- keys %{$rel_info->{cond}};
- push @$order, map { "${as}.$_" } @key;
-
- if (my $rel_order = $rel_info->{attrs}{order_by}) {
- # this is kludgy and incomplete, I am well aware
- # but the parent method is going away entirely anyway
- # so sod it
- my $sql_maker = $self->storage->sql_maker;
- my ($orig_ql, $orig_qr) = $sql_maker->_quote_chars;
- my $sep = $sql_maker->name_sep;
-
- # install our own quoter, so we can catch unqualified stuff
- local $sql_maker->{quote_char} = ["\x00", "\xFF"];
-
- my $quoted_prefix = "\x00${as}\xFF";
-
- for my $chunk ( $sql_maker->_order_by_chunks ($rel_order) ) {
- my @bind;
- ($chunk, @bind) = @$chunk if ref $chunk;
-
- $chunk = "${quoted_prefix}${sep}${chunk}"
- unless $chunk =~ /\Q$sep/;
-
- $chunk =~ s/\x00/$orig_ql/g;
- $chunk =~ s/\xFF/$orig_qr/g;
- push @$order, \[$chunk, @bind];
+ elsif (blessed($cond) and $cond->isa('Data::Query::ExprBuilder')) {
+ my (%cross, $unresolvable);
+ my $as = blessed($for) ? 'me' : $as;
+ my %action = map {
+ my ($ident, $thing, $other) = @$_;
+ ($ident => do {
+ if ($thing and !ref($thing)) {
+ sub {
+ $cross{$thing} = 1;
+ return \Identifier($thing, $_[0]->{elements}[1]);
+ }
+ } elsif (!defined($thing)) {
+ sub {
+ \perl_scalar_value(
+ undef,
+ $_[1] ? join('.', $other, $_[1]->{elements}[1]) : ()
+ );
+ }
+ } elsif ((ref($thing)||'') eq 'HASH') {
+ sub {
+ \perl_scalar_value(
+ $thing->{$_->{elements}[1]},
+ $_[1] ? join('.', $other, $_[1]->{elements}[1]) : ()
+ );
+ }
+ } elsif (blessed($thing)) {
+ sub {
+ unless ($thing->has_column_loaded($_[0]->{elements}[1])) {
+ if ($thing->in_storage) {
+ $self->throw_exception(sprintf
+ "Unable to resolve relationship '%s' from object %s: column '%s' not "
+ . 'loaded from storage (or not passed to new() prior to insert()). You '
+ . 'probably need to call ->discard_changes to get the server-side defaults '
+ . 'from the database.',
+ $as,
+ $thing,
+ $_[0]->{elements}[1]
+ );
+ }
+ $unresolvable = 1;
+ }
+ return \perl_scalar_value(
+ $thing->get_column($_[0]->{elements}[1]),
+ $_[1] ? join('.', $other, $_[1]->{elements}[1]) : ()
+ );
+ }
+ } else {
+ die "I have no idea what ${thing} is supposed to be";
}
+ })
+ } ([ foreign => $as, $for ], [ self => $for, $as ]);
+ my %seen;
+ my $mapped = map_dq_tree {
+ if (is_Operator and @{$_->{args}} == 2) {
+ @seen{@{$_->{args}}} = reverse @{$_->{args}};
}
- }
-
- return map { [ "${as}.$_", "${as_prefix}${pre}.$_", ] }
- $rel_source->columns;
+ if (
+ is_Identifier and @{$_->{elements}} == 2
+ and my $act = $action{$_->{elements}[0]}
+ ) {
+ return $act->($_, $seen{$_});
+ }
+ return $_;
+ } $cond->{expr};
+ return $UNRESOLVABLE_CONDITION if $unresolvable;
+ return (wantarray ? (\$mapped, (keys %cross == 2)) : \$mapped);
+ }
+ else {
+ $self->throw_exception ("Can't handle condition $cond for relationship '$rel_name' yet :(");
}
}
projects / dbsrgits/DBIx-Class.git / blobdiff