Initial Commit

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

@@ -0,0 +1,104 @@
+package # hide from PAUSE
+    DBIx::Class::Relationship::BelongsTo;
+
+# Documentation for these methods can be found in
+# DBIx::Class::Relationship
+
+use strict;
+use warnings;
+use Try::Tiny;
+use namespace::clean;
+
+our %_pod_inherit_config =
+  (
+   class_map => { 'DBIx::Class::Relationship::BelongsTo' => 'DBIx::Class::Relationship' }
+  );
+
+sub belongs_to {
+  my ($class, $rel, $f_class, $cond, $attrs) = @_;
+
+  # assume a foreign key constraint unless defined otherwise
+  $attrs->{is_foreign_key_constraint} = 1
+    if not exists $attrs->{is_foreign_key_constraint};
+  $attrs->{undef_on_null_fk} = 1
+    if not exists $attrs->{undef_on_null_fk};
+
+  # no join condition or just a column name
+  if (!ref $cond) {
+
+    my ($f_key, $guess);
+    if (defined $cond and length $cond) {
+      $f_key = $cond;
+      $guess = "caller specified foreign key '$f_key'";
+    }
+    else {
+      $f_key = $rel;
+      $guess = "using given relationship name '$rel' as foreign key column name";
+    }
+
+    $class->throw_exception(
+      "No such column '$f_key' declared yet on ${class} ($guess)"
+    )  unless $class->has_column($f_key);
+
+    $class->ensure_class_loaded($f_class);
+    my $f_rsrc = try {
+      $f_class->result_source_instance;
+    }
+    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)"
+      );
+    };
+
+    my $pri = $f_rsrc->_single_pri_col_or_die;
+
+    $cond = { "foreign.${pri}" => "self.${f_key}" };
+
+  }
+  # explicit join condition
+  else {
+    if (ref $cond eq 'HASH') { # ARRAY is also valid
+      my $cond_rel;
+      # FIXME This loop is ridiculously incomplete and dangerous
+      # staving off changes until implmentation of the swindon consensus
+      for (keys %$cond) {
+        if (m/\./) { # Explicit join condition
+          $cond_rel = $cond;
+          last;
+        }
+        $cond_rel->{"foreign.$_"} = "self.".$cond->{$_};
+      }
+      $cond = $cond_rel;
+    }
+  }
+
+  my $acc_type = (
+    ref $cond eq 'HASH'
+      and
+    keys %$cond == 1
+      and
+    (keys %$cond)[0] =~ /^foreign\./
+      and
+    $class->has_column($rel)
+  ) ? 'filter' : 'single';
+
+  my $fk_columns = ($acc_type eq 'single' and ref $cond eq 'HASH')
+    ? { map { $_ =~ /^self\.(.+)/ ? ( $1 => 1 ) : () } (values %$cond ) }
+    : undef
+  ;
+
+  $class->add_relationship($rel, $f_class,
+    $cond,
+    {
+      is_depends_on => 1,
+      accessor => $acc_type,
+      $fk_columns ? ( fk_columns => $fk_columns ) : (),
+      %{$attrs || {}}
+    }
+  );
+
+  return 1;
+}
+
+1;