use strict;
use warnings;
-use Carp;
-use Lingua::EN::Inflect ();
-use Lingua::EN::Inflect::Number ();
+use mro 'c3';
+use Carp::Clan qw/^DBIx::Class/;
+use Scalar::Util ();
+
+use Lingua::EN::Inflect::Phrase ();
+use DBIx::Class::Schema::Loader::Utils 'split_name';
+
+our $VERSION = '0.07002';
=head1 NAME
=head1 SYNOPSIS
-See L<DBIx::Class::Schema::Loader>
+See L<DBIx::Class::Schema::Loader> and L<DBIx::Class::Schema::Loader::Base>.
=head1 DESCRIPTION
=head2 new
-Arguments: schema_class (scalar), fk_info (hashref), inflect_plural, inflect_singular
+Arguments: $base object
-C<$schema_class> should be a schema class name, where the source
-classes have already been set up and registered. Column info, primary
-key, and unique constraints will be drawn from this schema for all
-of the existing source monikers.
+=head2 generate_code
-The fk_info hashref's contents should take the form:
+Arguments: local_moniker (scalar), fk_info (arrayref)
- {
- TableMoniker => [
- {
- local_columns => [ 'col2', 'col3' ],
- remote_columns => [ 'col5', 'col7' ],
- remote_moniker => 'AnotherTableMoniker',
- },
- # ...
- ],
- AnotherTableMoniker => [
- # ...
- ],
- # ...
- }
+This generates the code for the relationships of a given table.
-Options inflect_plural and inflect_singular are optional, and are better documented
-in L<DBIx::Class::Schema::Loader::Base>.
+C<local_moniker> is the moniker name of the table which had the REFERENCES
+statements. The fk_info arrayref's contents should take the form:
-=head2 generate_code
+ [
+ {
+ local_columns => [ 'col2', 'col3' ],
+ remote_columns => [ 'col5', 'col7' ],
+ remote_moniker => 'AnotherTableMoniker',
+ },
+ {
+ local_columns => [ 'col1', 'col4' ],
+ remote_columns => [ 'col1', 'col2' ],
+ remote_moniker => 'YetAnotherTableMoniker',
+ },
+ # ...
+ ],
-This method will return the generated relationships as a hashref per table moniker,
-containing an arrayref of code strings which can be "eval"-ed in the context of
-the source class, like:
+This method will return the generated relationships as a hashref keyed on the
+class names. The values are arrayrefs of hashes containing method name and
+arguments, like so:
{
'Some::Source::Class' => [
- "belongs_to( col1 => 'AnotherTableMoniker' )",
- "has_many( anothers => 'AnotherTableMoniker', 'col15' )",
+ { method => 'belongs_to', arguments => [ 'col1', 'Another::Source::Class' ],
+ { method => 'has_many', arguments => [ 'anothers', 'Yet::Another::Source::Class', 'col15' ],
],
'Another::Source::Class' => [
# ...
],
# ...
}
-
-You might want to use this in building an on-disk source class file, by
-adding each string to the appropriate source class file,
-prefixed by C<__PACKAGE__-E<gt>>.
=cut
+
sub new {
- my ( $class, $schema, $fk_info, $inflect_pl, $inflect_singular ) = @_;
+ my ( $class, $base ) = @_;
+
+ # from old POD about this constructor:
+ # C<$schema_class> should be a schema class name, where the source
+ # classes have already been set up and registered. Column info,
+ # primary key, and unique constraints will be drawn from this
+ # schema for all of the existing source monikers.
+
+ # Options inflect_plural and inflect_singular are optional, and
+ # are better documented in L<DBIx::Class::Schema::Loader::Base>.
my $self = {
- schema => $schema,
- fk_info => $fk_info,
- inflect_plural => $inflect_pl,
- inflect_singular => $inflect_singular,
+ base => $base,
+ schema => $base->schema,
+ inflect_plural => $base->inflect_plural,
+ inflect_singular => $base->inflect_singular,
+ relationship_attrs => $base->relationship_attrs,
};
- bless $self => $class;
+ Scalar::Util::weaken $self->{base}; #< don't leak
- $self;
+ # validate the relationship_attrs arg
+ if( defined $self->{relationship_attrs} ) {
+ ref $self->{relationship_attrs} eq 'HASH'
+ or croak "relationship_attrs must be a hashref";
+ }
+
+ return bless $self => $class;
}
sub _inflect_plural {
my ($self, $relname) = @_;
+ return '' if !defined $relname || $relname eq '';
+
if( ref $self->{inflect_plural} eq 'HASH' ) {
return $self->{inflect_plural}->{$relname}
if exists $self->{inflect_plural}->{$relname};
return $inflected if $inflected;
}
- return $self->{legacy_default_inflections}
- ? Lingua::EN::Inflect::PL($relname)
- : Lingua::EN::Inflect::Number::to_PL($relname);
+ return $self->_to_PL($relname);
}
# Singularize a relationship name
sub _inflect_singular {
my ($self, $relname) = @_;
+ return '' if !defined $relname || $relname eq '';
+
if( ref $self->{inflect_singular} eq 'HASH' ) {
return $self->{inflect_singular}->{$relname}
if exists $self->{inflect_singular}->{$relname};
return $inflected if $inflected;
}
- return $self->{legacy_default_inflections}
- ? $relname
- : Lingua::EN::Inflect::Number::to_S($relname);
+ return $self->_to_S($relname);
+}
+
+sub _to_PL {
+ my ($self, $name) = @_;
+
+ $name =~ s/_/ /g;
+ my $plural = Lingua::EN::Inflect::Phrase::to_PL($name);
+ $plural =~ s/ /_/g;
+
+ return $plural;
+}
+
+sub _to_S {
+ my ($self, $name) = @_;
+
+ $name =~ s/_/ /g;
+ my $singular = Lingua::EN::Inflect::Phrase::to_S($name);
+ $singular =~ s/ /_/g;
+
+ return $singular;
+}
+
+sub _default_relationship_attrs { +{
+ has_many => {
+ cascade_delete => 0,
+ cascade_copy => 0,
+ },
+ might_have => {
+ cascade_delete => 0,
+ cascade_copy => 0,
+ },
+ belongs_to => {
+ on_delete => 'CASCADE',
+ on_update => 'CASCADE',
+ is_deferrable => 1,
+ },
+} }
+
+# accessor for options to be passed to each generated relationship
+# type. take single argument, the relationship type name, and returns
+# either a hashref (if some options are set), or nothing
+sub _relationship_attrs {
+ my ( $self, $reltype ) = @_;
+ my $r = $self->{relationship_attrs};
+
+ my %composite = (
+ %{ $self->_default_relationship_attrs->{$reltype} || {} },
+ %{ $r->{all} || {} }
+ );
+
+ if( my $specific = $r->{$reltype} ) {
+ while( my ($k,$v) = each %$specific ) {
+ $composite{$k} = $v;
+ }
+ }
+ return \%composite;
+}
+
+sub _array_eq {
+ my ($self, $a, $b) = @_;
+
+ return unless @$a == @$b;
+
+ for (my $i = 0; $i < @$a; $i++) {
+ return unless $a->[$i] eq $b->[$i];
+ }
+ return 1;
+}
+
+sub _remote_attrs {
+ my ($self, $local_moniker, $local_cols) = @_;
+
+ # get our base set of attrs from _relationship_attrs, if present
+ my $attrs = $self->_relationship_attrs('belongs_to') || {};
+
+ # If the referring column is nullable, make 'belongs_to' an
+ # outer join, unless explicitly set by relationship_attrs
+ my $nullable = grep { $self->{schema}->source($local_moniker)->column_info($_)->{is_nullable} } @$local_cols;
+ $attrs->{join_type} = 'LEFT' if $nullable && !defined $attrs->{join_type};
+
+ return $attrs;
+}
+
+sub _sanitize_name {
+ my ($self, $name) = @_;
+
+ if (ref $name) {
+ # scalar ref for weird table name (like one containing a '.')
+ ($name = $$name) =~ s/\W+/_/g;
+ }
+ else {
+ # remove 'schema.' prefix if any
+ $name =~ s/^[^.]+\.//;
+ }
+
+ return $name;
+}
+
+sub _normalize_name {
+ my ($self, $name) = @_;
+
+ $name = $self->_sanitize_name($name);
+
+ my @words = split_name $name;
+
+ return join '_', map lc, @words;
+}
+
+sub _remote_relname {
+ my ($self, $remote_table, $cond) = @_;
+
+ my $remote_relname;
+ # for single-column case, set the remote relname to the column
+ # name, to make filter accessors work, but strip trailing _id
+ if(scalar keys %{$cond} == 1) {
+ my ($col) = values %{$cond};
+ $col = $self->_normalize_name($col);
+ $col =~ s/_id$//;
+ $remote_relname = $self->_inflect_singular($col);
+ }
+ else {
+ $remote_relname = $self->_inflect_singular($self->_normalize_name($remote_table));
+ }
+
+ return $remote_relname;
}
sub generate_code {
- my $self = shift;
+ my ($self, $local_moniker, $rels, $uniqs) = @_;
my $all_code = {};
- foreach my $local_moniker (keys %{$self->{fk_info}}) {
- my $local_table = $self->{schema}->source($local_moniker)->from;
- my $local_class = $self->{schema}->class($local_moniker);
- my $rels = $self->{fk_info}->{$local_moniker};
-
- my %counters;
- foreach my $rel (@$rels) {
- next if !$rel->{remote_source};
- $counters{$rel->{remote_source}}++;
- }
+ my $local_class = $self->{schema}->class($local_moniker);
- foreach my $rel (@$rels) {
- next if !$rel->{remote_source};
- my $local_cols = $rel->{local_columns};
- my $remote_cols = $rel->{remote_columns};
- my $remote_moniker = $rel->{remote_source};
- my $remote_obj = $self->{schema}->source($remote_moniker);
- my $remote_class = $self->{schema}->class($remote_moniker);
- my $remote_table = $remote_obj->from;
- $remote_cols ||= [ $remote_obj->primary_columns ];
-
- if($#$local_cols != $#$remote_cols) {
- croak "Column count mismatch: $local_moniker (@$local_cols) "
- . "$remote_moniker (@$remote_cols)";
- }
+ my %counters;
+ foreach my $rel (@$rels) {
+ next if !$rel->{remote_source};
+ $counters{$rel->{remote_source}}++;
+ }
- my %cond;
- foreach my $i (0 .. $#$local_cols) {
- $cond{$remote_cols->[$i]} = $local_cols->[$i];
- }
+ foreach my $rel (@$rels) {
+ my $remote_moniker = $rel->{remote_source}
+ or next;
- # If more than one rel between this pair of tables, use the
- # local col name(s) as the relname in the foreign source, instead
- # of the local table name.
- my $local_relname;
- if($counters{$remote_moniker} > 1) {
- $local_relname = $self->_inflect_plural(
- lc($local_table) . q{_} . join(q{_}, @$local_cols)
- );
- } else {
- $local_relname = $self->_inflect_plural(lc $local_table);
- }
+ my $remote_class = $self->{schema}->class($remote_moniker);
+ my $remote_obj = $self->{schema}->source($remote_moniker);
+ my $remote_cols = $rel->{remote_columns} || [ $remote_obj->primary_columns ];
- # for single-column case, set the relname to the column name,
- # to make filter accessors work
- my $remote_relname;
- if(scalar keys %cond == 1) {
- my ($col) = keys %cond;
- $remote_relname = $self->_inflect_singular($cond{$col});
- }
- else {
- $remote_relname = $self->_inflect_singular(lc $remote_table);
- }
+ my $local_cols = $rel->{local_columns};
- my %rev_cond = reverse %cond;
+ if($#$local_cols != $#$remote_cols) {
+ croak "Column count mismatch: $local_moniker (@$local_cols) "
+ . "$remote_moniker (@$remote_cols)";
+ }
+
+ my %cond;
+ foreach my $i (0 .. $#$local_cols) {
+ $cond{$remote_cols->[$i]} = $local_cols->[$i];
+ }
- for (keys %rev_cond) {
- $rev_cond{"foreign.$_"} = "self.".$rev_cond{$_};
- delete $rev_cond{$_};
+ my ( $local_relname, $remote_relname, $remote_method ) =
+ $self->_relnames_and_method( $local_moniker, $rel, \%cond, $uniqs, \%counters );
+
+ push(@{$all_code->{$local_class}},
+ { method => 'belongs_to',
+ args => [ $remote_relname,
+ $remote_class,
+ \%cond,
+ $self->_remote_attrs($local_moniker, $local_cols),
+ ],
}
+ );
- push(@{$all_code->{$local_class}},
- { method => 'belongs_to',
- args => [ $remote_relname,
- $remote_moniker,
- \%cond,
- ],
- }
- );
-
- push(@{$all_code->{$remote_class}},
- { method => 'has_many',
- args => [ $local_relname,
- $local_moniker,
- \%rev_cond,
- ],
- }
- );
+ my %rev_cond = reverse %cond;
+ for (keys %rev_cond) {
+ $rev_cond{"foreign.$_"} = "self.".$rev_cond{$_};
+ delete $rev_cond{$_};
}
+
+ push(@{$all_code->{$remote_class}},
+ { method => $remote_method,
+ args => [ $local_relname,
+ $local_class,
+ \%rev_cond,
+ $self->_relationship_attrs($remote_method),
+ ],
+ }
+ );
}
return $all_code;
}
+sub _relnames_and_method {
+ my ( $self, $local_moniker, $rel, $cond, $uniqs, $counters ) = @_;
+
+ my $remote_moniker = $rel->{remote_source};
+ my $remote_obj = $self->{schema}->source( $remote_moniker );
+ my $remote_class = $self->{schema}->class( $remote_moniker );
+ my $remote_relname = $self->_remote_relname( $remote_obj->from, $cond);
+
+ my $local_cols = $rel->{local_columns};
+ my $local_table = $self->{schema}->source($local_moniker)->from;
+
+ # If more than one rel between this pair of tables, use the local
+ # col names to distinguish
+ my ($local_relname, $local_relname_uninflected);
+ if ( $counters->{$remote_moniker} > 1) {
+ my $colnames = q{_} . $self->_normalize_name(join '_', @$local_cols);
+ $remote_relname .= $colnames if keys %$cond > 1;
+
+ $local_relname = $self->_normalize_name($local_table . $colnames);
+ $local_relname =~ s/_id$//;
+
+ $local_relname_uninflected = $local_relname;
+ $local_relname = $self->_inflect_plural($local_relname);
+ } else {
+ $local_relname_uninflected = $self->_normalize_name($local_table);
+ $local_relname = $self->_inflect_plural($self->_normalize_name($local_table));
+ }
+
+ my $remote_method = 'has_many';
+
+ # If the local columns have a UNIQUE constraint, this is a one-to-one rel
+ my $local_source = $self->{schema}->source($local_moniker);
+ if ($self->_array_eq([ $local_source->primary_columns ], $local_cols) ||
+ grep { $self->_array_eq($_->[1], $local_cols) } @$uniqs) {
+ $remote_method = 'might_have';
+ $local_relname = $self->_inflect_singular($local_relname_uninflected);
+ }
+
+ return ( $local_relname, $remote_relname, $remote_method );
+}
+
+=head1 AUTHOR
+
+See L<DBIx::Class::Schema::Loader/AUTHOR> and L<DBIx::Class::Schema::Loader/CONTRIBUTORS>.
+
+=head1 LICENSE
+
+This library is free software; you can redistribute it and/or modify it under
+the same terms as Perl itself.
+
+=cut
+
1;
+# vim:et sts=4 sw=4 tw=0:
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