Initial Commit

database/perl/vendor/lib/DBIx/Class/Relationship/HasOne.pm

@@ -0,0 +1,108 @@
+package # hide from PAUSE
+    DBIx::Class::Relationship::HasOne;
+
+use strict;
+use warnings;
+use DBIx::Class::Carp;
+use Try::Tiny;
+use namespace::clean;
+
+our %_pod_inherit_config =
+  (
+   class_map => { 'DBIx::Class::Relationship::HasOne' => 'DBIx::Class::Relationship' }
+  );
+
+sub might_have {
+  shift->_has_one('LEFT' => @_);
+}
+
+sub has_one {
+  shift->_has_one(undef() => @_);
+}
+
+sub _has_one {
+  my ($class, $join_type, $rel, $f_class, $cond, $attrs) = @_;
+  unless (ref $cond) {
+    my $pri = $class->result_source_instance->_single_pri_col_or_die;
+
+    my ($f_key,$guess,$f_rsrc);
+    if (defined $cond && length $cond) {
+      $f_key = $cond;
+      $guess = "caller specified foreign key '$f_key'";
+    }
+    else {
+      # at this point we need to load the foreigner, expensive or not
+      $class->ensure_class_loaded($f_class);
+
+      $f_rsrc = try {
+        my $r = $f_class->result_source_instance;
+        die "There got to be some columns by now... (exception caught and rewritten by catch below)"
+          unless $r->columns;
+        $r;
+      }
+      catch {
+        $class->throw_exception(
+          "Foreign class '$f_class' does not seem to be a Result class "
+        . "(or it simply did not load entirely due to a circular relation chain)"
+        );
+      };
+
+      if ($f_rsrc->has_column($rel)) {
+        $f_key = $rel;
+        $guess = "using given relationship name '$rel' as foreign key column name";
+      }
+      else {
+        $f_key = $f_rsrc->_single_pri_col_or_die;
+        $guess = "using primary key of foreign class for foreign key";
+      }
+    }
+
+# FIXME - this check needs to be moved to schema-composition time...
+#    # only perform checks if the far side was not preloaded above *AND*
+#    # appears to have been loaded by something else (has a rsrc_instance)
+#    if (! $f_rsrc and $f_rsrc = try { $f_class->result_source_instance }) {
+#      $class->throw_exception(
+#        "No such column '$f_key' on foreign class ${f_class} ($guess)"
+#      ) if !$f_rsrc->has_column($f_key);
+#    }
+
+    $cond = { "foreign.${f_key}" => "self.${pri}" };
+  }
+  $class->_validate_has_one_condition($cond);
+
+  my $default_cascade = ref $cond eq 'CODE' ? 0 : 1;
+
+  $class->add_relationship($rel, $f_class,
+   $cond,
+   { accessor => 'single',
+     cascade_update => $default_cascade,
+     cascade_delete => $default_cascade,
+     is_depends_on => 0,
+     ($join_type ? ('join_type' => $join_type) : ()),
+     %{$attrs || {}} });
+  1;
+}
+
+sub _validate_has_one_condition {
+  my ($class, $cond )  = @_;
+
+  return if $ENV{DBIC_DONT_VALIDATE_RELS};
+  return unless 'HASH' eq ref $cond;
+  foreach my $foreign_id ( keys %$cond ) {
+    my $self_id = $cond->{$foreign_id};
+
+    # we can ignore a bad $self_id because add_relationship handles this
+    # exception
+    return unless $self_id =~ /^self\.(.*)$/;
+
+    my $key = $1;
+    $class->throw_exception("Defining rel on ${class} that includes '$key' but no such column defined here yet")
+        unless $class->has_column($key);
+    my $column_info = $class->column_info($key);
+    if ( $column_info->{is_nullable} ) {
+      carp(qq'"might_have/has_one" must not be on columns with is_nullable set to true ($class/$key). This might indicate an incorrect use of those relationship helpers instead of belongs_to.');
+    }
+  }
+}
+
+1;