new dev release

[dbsrgits/DBIx-Class-Schema-Loader.git] / lib / DBIx / Class / Schema / Loader / RelBuilder.pm

diff --git a/lib/DBIx/Class/Schema/Loader/RelBuilder.pm b/lib/DBIx/Class/Schema/Loader/RelBuilder.pm
index 88671b5..9bc01c6 100644 (file)
--- a/lib/DBIx/Class/Schema/Loader/RelBuilder.pm
+++ b/lib/DBIx/Class/Schema/Loader/RelBuilder.pm
@@ -5,7 +5,7 @@ use warnings;
 use Carp::Clan qw/^DBIx::Class/;
 use Lingua::EN::Inflect::Number ();
 
-our $VERSION = '0.04005';
+our $VERSION = '0.04999_09';
 
 =head1 NAME
 
@@ -121,8 +121,63 @@ sub _inflect_singular {
     return Lingua::EN::Inflect::Number::to_S($relname);
 }
 
+sub _array_eq {
+    my ($a, $b) = @_;
+
+    return unless @$a == @$b;
+
+    for (my $i = 0; $i < @$a; $i++) {
+        return unless $a->[$i] eq $b->[$i];
+    }
+    return 1;
+}
+
+sub _uniq_fk_rel {
+    my ($self, $local_moniker, $local_relname, $local_cols, $uniqs) = @_;
+
+    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 (_array_eq([ $local_source->primary_columns ], $local_cols) ||
+            grep { _array_eq($_->[1], $local_cols) } @$uniqs) {
+        $remote_method = 'might_have';
+        $local_relname = $self->_inflect_singular($local_relname);
+    }
+
+    return ($remote_method, $local_relname);
+}
+
+sub _remote_attrs {
+       my ($self, $local_moniker, $local_cols) = @_;
+
+       # If the referring column is nullable, make 'belongs_to' an outer join:
+       my $nullable = grep { $self->{schema}->source($local_moniker)->column_info($_)->{is_nullable} }
+               @$local_cols;
+
+       return $nullable ? { join_type => 'LEFT' } : ();
+}
+
+sub _remote_relname {
+    my ($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};
+        $col =~ s/_id$//;
+        $remote_relname = $self->_inflect_singular($col);
+    }
+    else {
+        $remote_relname = $self->_inflect_singular(lc $remote_table);
+    }
+
+    return $remote_relname;
+}
+
 sub generate_code {
-    my ($self, $local_moniker, $rels) = @_;
+    my ($self, $local_moniker, $rels, $uniqs) = @_;
 
     my $all_code = {};
 
@@ -156,17 +211,7 @@ sub generate_code {
         }
 
         my $local_relname;
-        my $remote_relname;
-
-        # for single-column case, set the remote relname to the column
-        # name, to make filter accessors work
-        if(scalar keys %cond == 1) {
-            my ($col) = keys %cond;
-            $remote_relname = $self->_inflect_singular($cond{$col});
-        }
-        else {
-            $remote_relname = $self->_inflect_singular(lc $remote_table);
-        }
+        my $remote_relname = $self->_remote_relname($remote_table, \%cond);
 
         # If more than one rel between this pair of tables, use the local
         # col names to distinguish
@@ -187,17 +232,22 @@ sub generate_code {
             delete $rev_cond{$_};
         }
 
+        my ($remote_method);
+
+        ($remote_method, $local_relname) = $self->_uniq_fk_rel($local_moniker, $local_relname, $local_cols, $uniqs);
+
         push(@{$all_code->{$local_class}},
             { method => 'belongs_to',
               args => [ $remote_relname,
                         $remote_class,
                         \%cond,
+                        $self->_remote_attrs($local_moniker, $local_cols),
               ],
             }
         );
 
         push(@{$all_code->{$remote_class}},
-            { method => 'has_many',
+            { method => $remote_method,
               args => [ $local_relname,
                         $local_class,
                         \%rev_cond,