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 Carp::Clan qw/^DBIx::Class/;
+use DBIx::Class::Carp;
+use DBIx::Class::_Util 'is_literal_value';
+use Devel::GlobalDestruction;
use Try::Tiny;
use List::Util 'first';
+use Scalar::Util qw/blessed weaken isweak/;
+
use namespace::clean;
-use base qw/DBIx::Class/;
+__PACKAGE__->mk_group_accessors(simple => qw/
+ source_name name source_info
+ _ordered_columns _columns _primaries _unique_constraints
+ _relationships resultset_attributes
+ column_info_from_storage
+/);
-__PACKAGE__->mk_group_accessors('simple' => qw/_ordered_columns
- _columns _primaries _unique_constraints name resultset_attributes
- schema from _relationships column_info_from_storage source_info
- source_name sqlt_deploy_callback/);
+__PACKAGE__->mk_group_accessors(component_class => qw/
+ resultset_class
+ result_class
+/);
-__PACKAGE__->mk_group_accessors('component_class' => qw/resultset_class
- result_class/);
+__PACKAGE__->mk_classdata( sqlt_deploy_callback => 'default_sqlt_deploy_hook' );
=head1 NAME
# Create a table based result source, in a result class.
- package MyDB::Schema::Result::Artist;
+ package MyApp::Schema::Result::Artist;
use base qw/DBIx::Class::Core/;
__PACKAGE__->table('artist');
__PACKAGE__->add_columns(qw/ artistid name /);
__PACKAGE__->set_primary_key('artistid');
- __PACKAGE__->has_many(cds => 'MyDB::Schema::Result::CD');
+ __PACKAGE__->has_many(cds => 'MyApp::Schema::Result::CD');
1;
# Create a query (view) based result source, in a result class
- package MyDB::Schema::Result::Year2000CDs;
+ package MyApp::Schema::Result::Year2000CDs;
use base qw/DBIx::Class::Core/;
__PACKAGE__->load_components('InflateColumn::DateTime');
=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:
$schema->source($source_name);
-=item From a Row object:
+=item From a Result object:
- $row->result_source;
+ $result->result_source;
=item From a ResultSet object:
$new->{_relationships} = { %{$new->{_relationships}||{}} };
$new->{name} ||= "!!NAME NOT SET!!";
$new->{_columns_info_loaded} ||= 0;
- $new->{sqlt_deploy_callback} ||= "default_sqlt_deploy_hook";
return $new;
}
=item Arguments: @columns
-=item Return value: The ResultSource object
+=item Return Value: L<$result_source|/new>
=back
calls of this method will add more columns, not replace them.
The column names given will be created as accessor methods on your
-L<DBIx::Class::Row> objects. You can change the name of the accessor
+L<Result|DBIx::Class::Manual::ResultClass> objects. You can change the name of the accessor
by supplying an L</accessor> in the column_info hash.
If a column name beginning with a plus sign ('+col1') is provided, the
{ is_nullable => 1 }
-Set this to a true value for a columns that is allowed to contain NULL
+Set this to a true value for a column that is allowed to contain NULL
values, default is false. This is currently only used to create tables
from your schema, see L<DBIx::Class::Schema/deploy>.
will attempt to retrieve the name of the sequence from the database
automatically.
+=item retrieve_on_insert
+
+ { retrieve_on_insert => 1 }
+
+For every column where this is set to true, DBIC will retrieve the RDBMS-side
+value upon a new row insertion (normally only the autoincrement PK is
+retrieved on insert). C<INSERT ... RETURNING> is used automatically if
+supported by the underlying storage, otherwise an extra SELECT statement is
+executed to retrieve the missing data.
+
=item auto_nextval
+ { auto_nextval => 1 }
+
Set this to a true value for a column whose value is retrieved automatically
from a sequence or function (if supported by your Storage driver.) For a
sequence, if you do not use a trigger to get the nextval, you have to set the
=item Arguments: $colname, \%columninfo?
-=item Return value: 1/0 (true/false)
+=item Return Value: 1/0 (true/false)
=back
=item Arguments: $colname
-=item Return value: 1/0 (true/false)
+=item Return Value: 1/0 (true/false)
=back
=item Arguments: $colname
-=item Return value: Hashref of info
+=item Return Value: Hashref of info
=back
if ( ! $self->_columns->{$column}{data_type}
and ! $self->{_columns_info_loaded}
and $self->column_info_from_storage
- and $self->schema and my $stor = $self->storage )
+ and my $stor = try { $self->storage } )
{
$self->{_columns_info_loaded}++;
=over
-=item Arguments: None
+=item Arguments: none
-=item Return value: Ordered list of column names
+=item Return Value: Ordered list of column names
=back
=item Arguments: \@colnames ?
-=item Return value: Hashref of column name/info pairs
+=item Return Value: Hashref of column name/info pairs
=back
my $columns_info = $source->columns_info;
Like L</column_info> but returns information for the requested columns. If
-the optional column-list arrayref is ommitted it returns info on all columns
+the optional column-list arrayref is omitted it returns info on all columns
currently defined on the ResultSource via L</add_columns>.
=cut
and
$self->column_info_from_storage
and
- $self->schema
- and
- my $stor = $self->storage
+ my $stor = try { $self->storage }
) {
$self->{_columns_info_loaded}++;
}
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...?',
));
}
}
=item Arguments: @colnames
-=item Return value: undefined
+=item Return Value: not defined
=back
=item Arguments: $colname
-=item Return value: undefined
+=item Return Value: not defined
=back
=item Arguments: @cols
-=item Return value: undefined
+=item Return Value: not defined
=back
sub set_primary_key {
my ($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);
=over 4
-=item Arguments: None
+=item Arguments: none
-=item Return value: Ordered list of primary column names
+=item Return Value: Ordered list of primary column names
=back
# 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
+# inference)
+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
=item Arguments: $sequence_name
-=item Return value: undefined
+=item Return Value: not defined
=back
sub sequence {
my ($self,$seq) = @_;
- my $rsrc = $self->result_source;
- my @pks = $rsrc->primary_columns
- or next;
+ my @pks = $self->primary_columns
+ or return;
$_->{sequence} = $seq
- for values %{ $rsrc->columns_info (\@pks) };
+ for values %{ $self->columns_info (\@pks) };
}
=item Arguments: $name?, \@colnames
-=item Return value: undefined
+=item Return Value: not defined
=back
=item Arguments: @constraints
-=item Return value: undefined
+=item Return Value: not defined
=back
=item Arguments: \@colnames
-=item Return value: Constraint name
+=item Return Value: Constraint name
=back
=over 4
-=item Arguments: None
+=item Arguments: none
-=item Return value: Hash of unique constraint data
+=item Return Value: Hash of unique constraint data
=back
=over 4
-=item Arguments: None
+=item Arguments: none
-=item Return value: Unique constraint names
+=item Return Value: Unique constraint names
=back
=item Arguments: $constraintname
-=item Return value: List of constraint columns
+=item Return Value: List of constraint columns
=back
=over
-=item Arguments: $callback
+=item Arguments: $callback_name | \&callback_code
+
+=item Return Value: $callback_name | \&callback_code
=back
__PACKAGE__->sqlt_deploy_callback('mycallbackmethod');
+ or
+
+ __PACKAGE__->sqlt_deploy_callback(sub {
+ my ($source_instance, $sqlt_table) = @_;
+ ...
+ } );
+
An accessor to set a callback to be called during deployment of
the schema via L<DBIx::Class::Schema/create_ddl_dir> or
L<DBIx::Class::Schema/deploy>.
The callback can be set as either a code reference or the name of a
method in the current result class.
-If not set, the L</default_sqlt_deploy_hook> is called.
+Defaults to L</default_sqlt_deploy_hook>.
Your callback will be passed the $source object representing the
ResultSource instance being deployed, and the
=head2 default_sqlt_deploy_hook
-=over
-
-=item Arguments: $source, $sqlt_table
-
-=item Return value: undefined
-
-=back
-
-This is the sensible default for L</sqlt_deploy_callback>.
-
-If a method named C<sqlt_deploy_hook> exists in your Result class, it
-will be called and passed the current C<$source> and the
-C<$sqlt_table> being deployed.
+This is the default deploy hook implementation which checks if your
+current Result class has a C<sqlt_deploy_hook> method, and if present
+invokes it B<on the Result class directly>. This is to preserve the
+semantics of C<sqlt_deploy_hook> which was originally designed to expect
+the Result class name and the
+L<$sqlt_table instance|SQL::Translator::Schema::Table> of the table being
+deployed.
=cut
}
}
+=head2 result_class
+
+=over 4
+
+=item Arguments: $classname
+
+=item Return Value: $classname
+
+=back
+
+ use My::Schema::ResultClass::Inflator;
+ ...
+
+ use My::Schema::Artist;
+ ...
+ __PACKAGE__->result_class('My::Schema::ResultClass::Inflator');
+
+Set the default result class for this source. You can use this to create
+and use your own result inflator. See L<DBIx::Class::ResultSet/result_class>
+for more details.
+
+Please note that setting this to something like
+L<DBIx::Class::ResultClass::HashRefInflator> will make every result unblessed
+and make life more difficult. Inflators like those are better suited to
+temporary usage via L<DBIx::Class::ResultSet/result_class>.
+
=head2 resultset
=over 4
-=item Arguments: None
+=item Arguments: none
-=item Return value: $resultset
+=item Return Value: L<$resultset|DBIx::Class::ResultSet>
=back
=item Arguments: $classname
-=item Return value: $classname
+=item Return Value: $classname
=back
=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
'call it on the schema instead.'
) if scalar @_;
- return $self->resultset_class->new(
+ $self->resultset_class->new(
$self,
{
+ try { %{$self->schema->default_resultset_attributes} },
%{$self->{resultset_attributes}},
- %{$self->schema->default_resultset_attributes}
},
);
}
+=head2 name
+
+=over 4
+
+=item Arguments: none
+
+=item Result value: $name
+
+=back
+
+Returns the name of the result source, which will typically be the table
+name. This may be a scalar reference if the result source has a non-standard
+name.
+
=head2 source_name
=over 4
=over 4
-=item Arguments: None
+=item Arguments: none
-=item Return value: FROM clause
+=item Return Value: FROM clause
=back
retrieval from this source. In the case of a database, the required FROM
clause contents.
+=cut
+
+sub from { die 'Virtual method!' }
+
=head2 schema
=over 4
-=item Arguments: None
+=item Arguments: L<$schema?|DBIx::Class::Schema>
-=item Return value: A schema object
+=item Return Value: L<$schema|DBIx::Class::Schema>
=back
my $schema = $source->schema();
-Returns the L<DBIx::Class::Schema> object that this result source
-belongs to.
+Sets and/or returns the L<DBIx::Class::Schema> object to which this
+result source instance has been attached to.
+
+=cut
+
+sub schema {
+ if (@_ > 1) {
+ $_[0]->{schema} = $_[1];
+ }
+ else {
+ $_[0]->{schema} || do {
+ my $name = $_[0]->{source_name} || '_unnamed_';
+ my $err = 'Unable to perform storage-dependent operations with a detached result source '
+ . "(source '$name' is not associated with a schema).";
+
+ $err .= ' You need to use $schema->thaw() or manually set'
+ . ' $DBIx::Class::ResultSourceHandle::thaw_schema while thawing.'
+ if $_[0]->{_detached_thaw};
+
+ DBIx::Class::Exception->throw($err);
+ };
+ }
+}
=head2 storage
=over 4
-=item Arguments: None
+=item Arguments: none
-=item Return value: A Storage object
+=item Return Value: L<$storage|DBIx::Class::Storage>
=back
$source->storage->debug(1);
-Returns the storage handle for the current schema.
-
-See also: L<DBIx::Class::Storage>
+Returns the L<storage handle|DBIx::Class::Storage> for the current schema.
=cut
=over 4
-=item Arguments: $relname, $related_source_name, \%cond, [ \%attrs ]
+=item Arguments: $rel_name, $related_source_name, \%cond, \%attrs?
-=item Return value: 1/true if it succeeded
+=item Return Value: 1/true if it succeeded
=back
- $source->add_relationship('relname', 'related_source', $cond, $attrs);
+ $source->add_relationship('rel_name', 'related_source', $cond, $attrs);
L<DBIx::Class::Relationship> describes a series of methods which
create pre-defined useful types of relationships. Look there first
=over 4
-=item Arguments: None
+=item Arguments: none
-=item Return value: List of relationship names
+=item Return Value: L<@rel_names|DBIx::Class::Relationship>
=back
- my @relnames = $source->relationships();
+ my @rel_names = $source->relationships();
Returns all relationship names for this source.
=over 4
-=item Arguments: $relname
+=item Arguments: L<$rel_name|DBIx::Class::Relationship>
-=item Return value: Hashref of relation data,
+=item Return Value: L<\%rel_data|DBIx::Class::Relationship::Base/add_relationship>
=back
Returns a hash of relationship information for the specified relationship
-name. The keys/values are as specified for L</add_relationship>.
+name. The keys/values are as specified for L<DBIx::Class::Relationship::Base/add_relationship>.
=cut
sub relationship_info {
- my ($self, $rel) = @_;
- return $self->_relationships->{$rel};
+ #my ($self, $rel) = @_;
+ return shift->_relationships->{+shift};
}
=head2 has_relationship
=over 4
-=item Arguments: $rel
+=item Arguments: L<$rel_name|DBIx::Class::Relationship>
-=item Return value: 1/0 (true/false)
+=item Return Value: 1/0 (true/false)
=back
=cut
sub has_relationship {
- my ($self, $rel) = @_;
- return exists $self->_relationships->{$rel};
+ #my ($self, $rel) = @_;
+ return exists shift->_relationships->{+shift};
}
=head2 reverse_relationship_info
=over 4
-=item Arguments: $relname
+=item Arguments: L<$rel_name|DBIx::Class::Relationship>
-=item Return value: Hashref of relationship data
+=item Return Value: L<\%rel_data|DBIx::Class::Relationship::Base/add_relationship>
=back
sub reverse_relationship_info {
my ($self, $rel) = @_;
- my $rel_info = $self->relationship_info($rel);
+
+ my $rel_info = $self->relationship_info($rel)
+ or $self->throw_exception("No such relationship '$rel'");
+
my $ret = {};
return $ret unless ((ref $rel_info->{cond}) eq 'HASH');
- my @cond = keys(%{$rel_info->{cond}});
- my @refkeys = map {/^\w+\.(\w+)$/} @cond;
- my @keys = map {$rel_info->{cond}->{$_} =~ /^\w+\.(\w+)$/} @cond;
+ my $stripped_cond = $self->__strip_relcond ($rel_info->{cond});
+
+ my $registered_source_name = $self->source_name;
- # Get the related result source for this relationship
- my $othertable = $self->related_source($rel);
+ # this may be a partial schema or something else equally esoteric
+ 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
- # columns are our foreign columns on $rel.
- my @otherrels = $othertable->relationships();
- my $otherrelationship;
- foreach my $otherrel (@otherrels) {
- my $otherrel_info = $othertable->relationship_info($otherrel);
+ # columns are our foreign columns on $rel
+ foreach my $other_rel ($other_rsrc->relationships) {
- my $back = $othertable->related_source($otherrel);
- next unless $back->source_name eq $self->source_name;
+ # only consider stuff that points back to us
+ # "us" here is tricky - if we are in a schema registration, we want
+ # to use the source_names, otherwise we will use the actual classes
- my @othertestconds;
+ # the schema may be partial
+ my $roundtrip_rsrc = try { $other_rsrc->related_source($other_rel) }
+ or next;
- if (ref $otherrel_info->{cond} eq 'HASH') {
- @othertestconds = ($otherrel_info->{cond});
- }
- elsif (ref $otherrel_info->{cond} eq 'ARRAY') {
- @othertestconds = @{$otherrel_info->{cond}};
+ if ($registered_source_name) {
+ next if $registered_source_name ne ($roundtrip_rsrc->source_name || '')
}
else {
- next;
+ next if $self->result_class ne $roundtrip_rsrc->result_class;
}
- foreach my $othercond (@othertestconds) {
- my @other_cond = keys(%$othercond);
- my @other_refkeys = map {/^\w+\.(\w+)$/} @other_cond;
- my @other_keys = map {$othercond->{$_} =~ /^\w+\.(\w+)$/} @other_cond;
- next if (!$self->_compare_relationship_keys(\@refkeys, \@other_keys) ||
- !$self->_compare_relationship_keys(\@other_refkeys, \@keys));
- $ret->{$otherrel} = $otherrel_info;
- }
+ 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});
+
+ $ret->{$other_rel} = $other_rel_info if (
+ $self->_compare_relationship_keys (
+ [ keys %$stripped_cond ], [ values %$other_stripped_cond ]
+ )
+ and
+ $self->_compare_relationship_keys (
+ [ values %$stripped_cond ], [ keys %$other_stripped_cond ]
+ )
+ );
}
+
return $ret;
}
+# all this does is removes the foreign/self prefix from a condition
+sub __strip_relcond {
+ +{
+ map
+ { map { /^ (?:foreign|self) \. (\w+) $/x } ($_, $_[1]{$_}) }
+ keys %{$_[1]}
+ }
+}
+
sub compare_relationship_keys {
carp 'compare_relationship_keys is a private method, stop calling it';
my $self = shift;
# Returns true if both sets of keynames are the same, false otherwise.
sub _compare_relationship_keys {
- my ($self, $keys1, $keys2) = @_;
-
- # Make sure every keys1 is in keys2
- my $found;
- foreach my $key (@$keys1) {
- $found = 0;
- foreach my $prim (@$keys2) {
- if ($prim eq $key) {
- $found = 1;
- last;
- }
- }
- last unless $found;
- }
+# my ($self, $keys1, $keys2) = @_;
+ return
+ join ("\x00", sort @{$_[1]})
+ eq
+ join ("\x00", sort @{$_[2]})
+ ;
+}
- # Make sure every key2 is in key1
- if ($found) {
- foreach my $prim (@$keys2) {
- $found = 0;
- foreach my $key (@$keys1) {
- if ($prim eq $key) {
- $found = 1;
- last;
- }
- }
- last unless $found;
+# optionally takes either an arrayref of column names, or a hashref of already
+# retrieved colinfos
+# returns an arrayref of column names of the shortest unique constraint
+# (matching some of the input if any), giving preference to the PK
+sub _identifying_column_set {
+ my ($self, $cols) = @_;
+
+ my %unique = $self->unique_constraints;
+ my $colinfos = ref $cols eq 'HASH' ? $cols : $self->columns_info($cols||());
+
+ # always prefer the PK first, and then shortest constraints first
+ USET:
+ for my $set (delete $unique{primary}, sort { @$a <=> @$b } (values %unique) ) {
+ next unless $set && @$set;
+
+ for (@$set) {
+ next USET unless ($colinfos->{$_} && !$colinfos->{$_}{is_nullable} );
}
+
+ # copy so we can mangle it at will
+ return [ @$set ];
}
- return $found;
+ return undef;
}
# Returns the {from} structure used to express JOIN conditions
$jpath = [@$jpath]; # copy
- if (not defined $join) {
+ if (not defined $join or not length $join) {
return ();
}
elsif (ref $join eq 'ARRAY') {
my $rel_src = $self->related_source($join);
return [ { $as => $rel_src->from,
- -source_handle => $rel_src->handle,
+ -rsrc => $rel_src,
-join_type => $parent_force_left
? 'left'
: $rel_info->{attrs}{join_type}
,
-join_path => [@$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,
},
- $self->_resolve_condition($rel_info->{cond}, $as, $alias) ];
+ scalar $self->_resolve_condition($rel_info->{cond}, $as, $alias, $join)
+ ];
}
}
# having already been inserted. Takes the name of the relationship and a
# hashref of columns of the related object.
sub _pk_depends_on {
- my ($self, $relname, $rel_data) = @_;
+ my ($self, $rel_name, $rel_data) = @_;
- my $relinfo = $self->relationship_info($relname);
+ my $relinfo = $self->relationship_info($rel_name);
# don't assume things if the relationship direction is specified
return $relinfo->{attrs}{is_foreign_key_constraint}
# assume anything that references our PK probably is dependent on us
# rather than vice versa, unless the far side is (a) defined or (b)
# auto-increment
- my $rel_source = $self->related_source($relname);
+ my $rel_source = $self->related_source($rel_name);
foreach my $p ($self->primary_columns) {
if (exists $keyhash->{$p}) {
return 1;
}
-sub resolve_condition {
- carp 'resolve_condition is a private method, stop calling it';
- my $self = shift;
- $self->_resolve_condition (@_);
-}
+sub _resolve_condition {
+# carp_unique sprintf
+# '_resolve_condition is a private method, and moreover is about to go '
+# . 'away. Please contact the development team at %s if you believe you '
+# . 'have a genuine use for this method, in order to discuss alternatives.',
+# DBIx::Class::_ENV_::HELP_URL,
+# ;
-# Resolves the passed condition to a concrete query fragment. If given an alias,
-# returns a join condition; if given an object, inverts that object to produce
-# a related conditional from that object.
-our $UNRESOLVABLE_CONDITION = \'1 = 0';
+#######################
+### API Design? What's that...? (a backwards compatible shim, kill me now)
-sub _resolve_condition {
- my ($self, $cond, $as, $for) = @_;
- if (ref $cond eq 'HASH') {
- my %ret;
- foreach my $k (keys %{$cond}) {
- my $v = $cond->{$k};
- # XXX should probably check these are valid columns
- $k =~ s/^foreign\.// ||
- $self->throw_exception("Invalid rel cond key ${k}");
- $v =~ s/^self\.// ||
- $self->throw_exception("Invalid rel cond val ${v}");
- if (ref $for) { # Object
- #warn "$self $k $for $v";
- unless ($for->has_column_loaded($v)) {
- if ($for->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,
- $for,
- $v,
- );
- }
- return $UNRESOLVABLE_CONDITION;
- }
- $ret{$k} = $for->get_column($v);
- #$ret{$k} = $for->get_column($v) if $for->has_column_loaded($v);
- #warn %ret;
- } elsif (!defined $for) { # undef, i.e. "no object"
- $ret{$k} = undef;
- } elsif (ref $as eq 'HASH') { # reverse hashref
- $ret{$v} = $as->{$k};
- } elsif (ref $as) { # reverse object
- $ret{$v} = $as->get_column($k);
- } elsif (!defined $as) { # undef, i.e. "no reverse object"
- $ret{$v} = undef;
- } else {
- $ret{"${as}.${k}"} = "${for}.${v}";
+ my ($self, $cond, @res_args, $rel_name);
+
+ # we *SIMPLY DON'T KNOW YET* which arg is which, yay
+ ($self, $cond, $res_args[0], $res_args[1], $rel_name) = @_;
+
+ # assume that an undef is an object-like unset (set_from_related(undef))
+ my @is_objlike = map { ! defined $_ or length ref $_ } (@res_args);
+
+ # turn objlike into proper objects for saner code further down
+ for (0,1) {
+ next unless $is_objlike[$_];
+
+ if ( defined blessed $res_args[$_] ) {
+
+ # but wait - there is more!!! WHAT THE FUCK?!?!?!?!
+ if ($res_args[$_]->isa('DBIx::Class::ResultSet')) {
+ carp('Passing a resultset for relationship resolution makes no sense - invoking __gremlins__');
+ $is_objlike[$_] = 0;
+ $res_args[$_] = '__gremlins__';
}
}
- return \%ret;
- } elsif (ref $cond eq 'ARRAY') {
- return [ map { $self->_resolve_condition($_, $as, $for) } @$cond ];
- } else {
- die("Can't handle condition $cond yet :(");
+ else {
+ $res_args[$_] ||= {};
+
+ # hate everywhere - have to pass in as a plain hash
+ # pretending to be an object at least for now
+ $self->throw_exception("Unsupported object-like structure encountered: $res_args[$_]")
+ unless ref $res_args[$_] eq 'HASH';
+ }
}
-}
+ $self->throw_exception('No practical way to resolve a relationship between two structures')
+ if $is_objlike[0] and $is_objlike[1];
-# 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.
+ my $args = {
+ condition => $cond,
-sub _resolve_prefetch {
- my ($self, $pre, $alias, $alias_map, $order, $collapse, $pref_path) = @_;
- $pref_path ||= [];
+ # where-is-waldo block guesses relname, then further down we override it if available
+ (
+ $is_objlike[1] ? ( rel_name => $res_args[0], self_alias => $res_args[0], foreign_alias => 'me', self_resultobj => $res_args[1] )
+ : $is_objlike[0] ? ( rel_name => $res_args[1], self_alias => 'me', foreign_alias => $res_args[1], foreign_resultobj => $res_args[0] )
+ : ( rel_name => $res_args[0], self_alias => $res_args[1], foreign_alias => $res_args[0] )
+ ),
- if (not defined $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;
+ ( $rel_name ? ( rel_name => $rel_name ) : () ),
+ };
+#######################
+
+ # now it's fucking easy isn't it?!
+ my @res = $self->_resolve_relationship_condition( $args );
+
+ # FIXME - this is also insane, but just be consistent for now
+ # _resolve_relationship_condition always returns qualified cols
+ # even in the case of objects, but nothing downstream expects this
+ if (ref $res[0] eq 'HASH' and ($is_objlike[0] or $is_objlike[1]) ) {
+ $res[0] = { map
+ { ($_ =~ /\.(.+)/) => $res[0]{$_} }
+ keys %{$res[0]}
+ };
}
- elsif( ref $pre ) {
- $self->throw_exception(
- "don't know how to resolve prefetch reftype ".ref($pre));
+
+ # more legacy
+ return wantarray ? @res : $res[0];
+}
+
+our $UNRESOLVABLE_CONDITION = \ '1 = 0';
+
+# 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-trivial values (normally conditions) returned as a part
+# of a joinfree condition hash
+sub _resolve_relationship_condition {
+ my $self = shift;
+
+ # self-explanatory API, modeled on the custom cond coderef:
+ # condition
+ # rel_name
+ # foreign_alias
+ # foreign_resultobj
+ # self_alias
+ # self_resultobj
+ my $args = { ref $_[0] eq 'HASH' ? %{ $_[0] } : @_ };
+
+ for ( qw( rel_name self_alias foreign_alias ) ) {
+ $self->throw_exception("Mandatory attribute '$_' is not a plain string")
+ if !defined $args->{$_} or length ref $args->{$_};
}
- 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.'
+ $self->throw_exception('No practical way to resolve a relationship between two objects')
+ if defined $args->{self_resultobj} and defined $args->{foreign_resultobj};
+
+ $args->{condition} ||= $self->relationship_info($args->{rel_name})->{cond};
+
+ if (ref $args->{condition} eq 'CODE') {
+
+ my $cref_args = {
+ rel_name => $args->{rel_name},
+ self_resultsource => $self,
+ self_alias => $args->{self_alias},
+ foreign_alias => $args->{foreign_alias},
+ self_resultobj => $args->{self_resultobj},
+ foreign_resultobj => $args->{foreign_resultobj},
+ };
+
+ # legacy - never remove these!!!
+ $cref_args->{foreign_relname} = $cref_args->{rel_name};
+ $cref_args->{self_rowobj} = $cref_args->{self_resultobj};
+
+ my ($crosstable_cond, $joinfree_cond, @extra) = $args->{condition}->($cref_args);
+
+ # FIXME sanity check
+ carp_unique('A custom condition coderef can return at most 2 conditions: extra return values discarded')
+ if @extra;
+
+ my @nonvalue_cols;
+ if ($joinfree_cond) {
+
+ my ($joinfree_alias, $joinfree_source);
+ if (defined $args->{self_resultobj}) {
+ $joinfree_alias = $args->{foreign_alias};
+ $joinfree_source = $self->related_source($args->{rel_name});
+ }
+ elsif (defined $args->{foreign_resultobj}) {
+ $joinfree_alias = $args->{self_alias};
+ $joinfree_source = $self;
+ }
+
+ # FIXME sanity check until things stabilize, remove at some point
+ $self->throw_exception (
+ "A join-free condition returned for relationship '$args->{rel_name}' without a result object to chain from"
+ ) unless $joinfree_alias;
+
+ my $fq_col_list = { map { ( "$joinfree_alias.$_" => 1 ) } $joinfree_source->columns };
+
+ # FIXME another sanity check
+ if (
+ ref $joinfree_cond ne 'HASH'
+ or
+ grep { ! $fq_col_list->{$_} } keys %$joinfree_cond
+ ) {
+ $self->throw_exception (
+ "The join-free condition returned for relationship '$args->{rel_name}' must be a hash "
+ .'reference with all keys being fully qualified column names of the corresponding source'
);
}
- #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];
+
+ # see which parts of the joinfree cond are *NOT* foreign-source-column equalities
+ my $joinfree_cond_equality_columns = { map
+ {( $_ => 1 )}
+ @{ $self->schema->storage->_extract_fixed_condition_columns($joinfree_cond) }
+ };
+ @nonvalue_cols = map
+ { $_ =~ /^\Q$joinfree_alias.\E(.+)/ }
+ grep
+ { ! $joinfree_cond_equality_columns->{$_} }
+ keys %$joinfree_cond;
+
+ return ($joinfree_cond, 0, (@nonvalue_cols ? \@nonvalue_cols : undef));
+ }
+ else {
+ return ($crosstable_cond, 1);
+ }
+ }
+ elsif (ref $args->{condition} eq 'HASH') {
+
+ # the condition is static - use parallel arrays
+ # for a "pivot" depending on which side of the
+ # rel did we get as an object
+ my (@f_cols, @l_cols);
+ for my $fc (keys %{$args->{condition}}) {
+ my $lc = $args->{condition}{$fc};
+
+ # FIXME STRICTMODE should probably check these are valid columns
+ $fc =~ s/^foreign\.// ||
+ $self->throw_exception("Invalid rel cond key '$fc'");
+
+ $lc =~ s/^self\.// ||
+ $self->throw_exception("Invalid rel cond val '$lc'");
+
+ push @f_cols, $fc;
+ push @l_cols, $lc;
+ }
+
+ # plain values
+ if (! defined $args->{self_resultobj} and ! defined $args->{foreign_resultobj}) {
+ return ( { map
+ {( "$args->{foreign_alias}.$f_cols[$_]" => { -ident => "$args->{self_alias}.$l_cols[$_]" } )}
+ (0..$#f_cols)
+ }, 1 ); # is crosstable
+ }
+ else {
+
+ my $cond;
+
+ my ($obj, $obj_alias, $plain_alias, $obj_cols, $plain_cols) = defined $args->{self_resultobj}
+ ? ( @{$args}{qw( self_resultobj self_alias foreign_alias )}, \@l_cols, \@f_cols )
+ : ( @{$args}{qw( foreign_resultobj foreign_alias self_alias )}, \@f_cols, \@l_cols )
+ ;
+
+ for my $i (0..$#$obj_cols) {
+
+ # FIXME - temp shim
+ if (! blessed $obj) {
+ $cond->{"$plain_alias.$plain_cols->[$i]"} = $obj->{$obj_cols->[$i]};
+ }
+ elsif (
+ defined $args->{self_resultobj}
+ and
+ ! $obj->has_column_loaded($obj_cols->[$i])
+ ) {
+
+ $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.',
+ $args->{rel_name},
+ $obj,
+ $obj_cols->[$i],
+ ) if $obj->in_storage;
+
+ return $UNRESOLVABLE_CONDITION;
+ }
+ else {
+ $cond->{"$plain_alias.$plain_cols->[$i]"} = $obj->get_column($obj_cols->[$i]);
}
}
- }
- return map { [ "${as}.$_", "${as_prefix}${pre}.$_", ] }
- $rel_source->columns;
+ return ($cond, 0); # joinfree
+ }
+ }
+ elsif (ref $args->{condition} eq 'ARRAY') {
+ if (@{$args->{condition}} == 0) {
+ return $UNRESOLVABLE_CONDITION;
+ }
+ elsif (@{$args->{condition}} == 1) {
+ return $self->_resolve_relationship_condition({
+ %$args,
+ condition => $args->{condition}[0],
+ });
+ }
+ else {
+ # FIXME - we are discarding nonvalues here... likely incorrect...
+ # then again - the entire thing is an OR, so we *can't* use
+ # the values anyway
+ # Return a hard crosstable => 1 to ensure nothing tries to use
+ # the result in such manner
+ my @ret;
+ for (@{$args->{condition}}) {
+ my ($cond) = $self->_resolve_relationship_condition({
+ %$args,
+ condition => $_,
+ });
+ push @ret, $cond;
+ }
+ return (\@ret, 1); # forced cross-tab
+ }
+ }
+ else {
+ $self->throw_exception ("Can't handle condition $args->{condition} for relationship '$args->{rel_name}' yet :(");
}
+
+ die "not supposed to get here - missing return()";
}
=head2 related_source
=over 4
-=item Arguments: $relname
+=item Arguments: $rel_name
-=item Return value: $source
+=item Return Value: $source
=back
if( !$self->has_relationship( $rel ) ) {
$self->throw_exception("No such relationship '$rel' on " . $self->source_name);
}
- return $self->schema->source($self->relationship_info($rel)->{source});
+
+ # if we are not registered with a schema - just use the prototype
+ # however if we do have a schema - ask for the source by name (and
+ # throw in the process if all fails)
+ if (my $schema = try { $self->schema }) {
+ $schema->source($self->relationship_info($rel)->{source});
+ }
+ else {
+ my $class = $self->relationship_info($rel)->{class};
+ $self->ensure_class_loaded($class);
+ $class->result_source_instance;
+ }
}
=head2 related_class
=over 4
-=item Arguments: $relname
+=item Arguments: $rel_name
-=item Return value: $classname
+=item Return Value: $classname
=back
=head2 handle
-Obtain a new handle to this source. Returns an instance of a
-L<DBIx::Class::ResultSourceHandle>.
+=over 4
+
+=item Arguments: none
+
+=item Return Value: L<$source_handle|DBIx::Class::ResultSourceHandle>
+
+=back
+
+Obtain a new L<result source handle instance|DBIx::Class::ResultSourceHandle>
+for this source. Used as a serializable pointer to this resultsource, as it is not
+easy (nor advisable) to serialize CODErefs which may very well be present in e.g.
+relationship definitions.
=cut
sub handle {
- return DBIx::Class::ResultSourceHandle->new({
- schema => $_[0]->schema,
- source_moniker => $_[0]->source_name
- });
+ return DBIx::Class::ResultSourceHandle->new({
+ source_moniker => $_[0]->source_name,
+
+ # so that a detached thaw can be re-frozen
+ $_[0]->{_detached_thaw}
+ ? ( _detached_source => $_[0] )
+ : ( schema => $_[0]->schema )
+ ,
+ });
+}
+
+my $global_phase_destroy;
+sub DESTROY {
+ return if $global_phase_destroy ||= in_global_destruction;
+
+######
+# !!! ACHTUNG !!!!
+######
+#
+# Under no circumstances shall $_[0] be stored anywhere else (like copied to
+# a lexical variable, or shifted, or anything else). Doing so will mess up
+# the refcount of this particular result source, and will allow the $schema
+# we are trying to save to reattach back to the source we are destroying.
+# The relevant code checking refcounts is in ::Schema::DESTROY()
+
+ # if we are not a schema instance holder - we don't matter
+ return if(
+ ! ref $_[0]->{schema}
+ or
+ isweak $_[0]->{schema}
+ );
+
+ # weaken our schema hold forcing the schema to find somewhere else to live
+ # during global destruction (if we have not yet bailed out) this will throw
+ # which will serve as a signal to not try doing anything else
+ # however beware - on older perls the exception seems randomly untrappable
+ # due to some weird race condition during thread joining :(((
+ local $@;
+ eval {
+ weaken $_[0]->{schema};
+
+ # if schema is still there reintroduce ourselves with strong refs back to us
+ if ($_[0]->{schema}) {
+ my $srcregs = $_[0]->{schema}->source_registrations;
+ for (keys %$srcregs) {
+ next unless $srcregs->{$_};
+ $srcregs->{$_} = $_[0] if $srcregs->{$_} == $_[0];
+ }
+ }
+
+ 1;
+ } or do {
+ $global_phase_destroy = 1;
+ };
+
+ return;
+}
+
+sub STORABLE_freeze { Storable::nfreeze($_[0]->handle) }
+
+sub STORABLE_thaw {
+ my ($self, $cloning, $ice) = @_;
+ %$self = %{ (Storable::thaw($ice))->resolve };
}
=head2 throw_exception
sub throw_exception {
my $self = shift;
- if (defined $self->schema) {
- $self->schema->throw_exception(@_);
- }
- else {
- DBIx::Class::Exception->throw(@_);
- }
+ $self->{schema}
+ ? $self->{schema}->throw_exception(@_)
+ : DBIx::Class::Exception->throw(@_)
+ ;
}
=head2 source_info
=item Arguments: 1/0 (default: 0)
-=item Return value: 1/0
+=item Return Value: 1/0
=back
should not be used. It will be removed before 1.0.
-=head1 AUTHORS
+=head1 AUTHOR AND CONTRIBUTORS
-Matt S. Trout <mst@shadowcatsystems.co.uk>
+See L<AUTHOR|DBIx::Class/AUTHOR> and L<CONTRIBUTORS|DBIx::Class/CONTRIBUTORS> in DBIx::Class
=head1 LICENSE