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package DBIx::DataModel::Source::Join; |
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use warnings; |
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use strict; |
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use parent 'DBIx::DataModel::Source'; |
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use mro 'c3'; |
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require 5.008; # for filehandle in memory |
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use Carp::Clan qw[^(DBIx::DataModel::|SQL::Abstract)]; |
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sub db_from { |
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my $self = shift; |
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# list of join components from the Meta::Join |
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my $db_from = $self->metadm->db_from; |
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# if there is no db_schema, just return that list |
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my $db_schema = $self->schema->db_schema |
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or return $db_from; |
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# otherwise, prefix each table in list with $db_schema. The list is of |
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# shape: [-join => $table1, $join_spec1, $table2, $join_spec2 .... $table_n]; |
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# therefore tables are at odd positions in the list. Tables already containing |
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# a '.' are left untouched. |
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my @copy = @$db_from; |
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for (my $i=1; $i < @copy; $i += 2) { |
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/\./ or $_ = "$db_schema.$_" for $copy[$i]; |
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} |
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return \@copy; |
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} |
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# Support for Storable::{freeze,thaw} : just a stupid blank operation, |
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# but that will force Storable::thaw to try to reload the join class ... |
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# and then we can catch it and generate it on the fly (see @INC below) |
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sub STORABLE_freeze { |
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my ($self, $is_cloning) = @_; |
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return if $is_cloning; |
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my $copy = {%$self}; |
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return Storable::freeze($copy); |
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} |
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sub STORABLE_thaw { |
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my ($self, $is_cloning, $serialized) = @_; |
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return if $is_cloning; |
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my $copy = Storable::thaw($serialized); |
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%$self = %$copy; |
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} |
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# Add a coderef handler into @INC, so that when Storable::thaw tries to load |
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# a join, we take control, generate the Join on the fly, and return |
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# a fake file to load. |
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push @INC, sub { # coderef into @INC: see L |
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my ($self_coderef, $filename) = @_; |
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# did we try to load an AutoJoin ? |
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my ($schema, $join) = ($filename =~ m[^(.+?)/AutoJoin/(.+)$]) |
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or return; |
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# is it really an AutoJoin in DBIx::DataModel ? |
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$schema =~ s[/][::]g; |
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$schema->isa('DBIx::DataModel::Schema') |
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or return; |
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# OK, this is really our business. Parse the join name into path items, i.e. |
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# qw/My::Table <=> path1 => path2 => .../ |
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$join =~ s/\.pm$//; |
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my ($initial_table, @paths) = split /(=>)/, $join; |
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$initial_table =~ s[/][::]g; |
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# ask schema to create the Join |
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$schema->metadm->define_join($initial_table, @paths); |
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# return a fake filehandle in memory so that "require" is happy |
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1
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open my $fh, "<", \"1"; # pseudo-file just containing "1" |
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return $fh; |
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}; |
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1; # End of DBIx::DataModel::Source::Join |
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__END__ |