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package DBIx::DataModel::Meta::Path; |
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7236
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use strict; |
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use warnings; |
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use parent "DBIx::DataModel::Meta"; |
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use DBIx::DataModel; |
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use DBIx::DataModel::Meta::Utils qw/define_readonly_accessors/; |
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use Scalar::Util qw/looks_like_number weaken/; |
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use Params::Validate qw/validate_with SCALAR HASHREF ARRAYREF OBJECT/; |
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use Carp::Clan qw[^(DBIx::DataModel::|SQL::Abstract)]; |
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use namespace::clean; |
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{no strict 'refs'; *CARP_NOT = \@DBIx::DataModel::CARP_NOT;} |
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my $path_spec = { |
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name => {type => SCALAR}, |
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from => {isa => 'DBIx::DataModel::Meta::Source::Table'}, |
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to => {isa => 'DBIx::DataModel::Meta::Source::Table'}, |
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on => {type => HASHREF}, # join condition |
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multiplicity => {type => ARRAYREF}, |
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association => {type => OBJECT, |
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isa => "DBIx::DataModel::Meta::Association"}, |
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direction => {type => SCALAR, regex => qr/^(AB|BA)$/}, |
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}; |
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sub new { |
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my $class = shift; |
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# parse arguments and create $self |
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my $self = validate_with( |
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params => \@_, |
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spec => $path_spec, |
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allow_extra => 0, |
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); |
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my $path = $self->{name}; |
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weaken $self->{$_} for qw/from to association/; |
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# add this path into the 'from' metaclass |
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not $self->{from}{path}{$path} |
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or croak "$self->{from}{class} already has a path '$path'"; |
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$self->{from}{path}{$path} = $self; |
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push @{$self->{from}{components}}, $path |
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if $self->{association}{kind} eq 'Composition'; |
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# install a navigation method into the 'from' table class |
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my @navigation_args = ($self->{name}, # method name |
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$self->{name}); # path to follow |
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push @navigation_args, {-result_as => "firstrow"} |
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100
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if $self->{multiplicity}[1] == 1; |
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$self->{from}->define_navigation_method(@navigation_args); |
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bless $self, $class; |
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} |
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define_readonly_accessors(__PACKAGE__, keys %$path_spec); |
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59
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sub opposite { |
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3
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3
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1
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1221
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my $self = shift; |
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3
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10
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my $opposite_direction = reverse $self->direction; |
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3
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5
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my $opposite_path = "path_".$opposite_direction; |
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3
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return $self->association->$opposite_path; |
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} |
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67
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1; |
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__END__ |