From: Peter Rabbitson <ribasushi@cpan.org>
Date: Fri, 17 Jan 2014 06:12:26 +0000 (+0100)
Subject: Support for undef and/or foreign attributes (e.g. CDBI::Sweet)
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=333eae181a23079dec6a7bf7b4244d6e6c4f749d;p=dbsrgits%2FSQL-Abstract.git

Support for undef and/or foreign attributes (e.g. CDBI::Sweet)

Extra CDBI insanity (didn't work too well... once I hit _bindargs)
---

diff --git a/lib/SQL/Abstract.pm b/lib/SQL/Abstract.pm
index cffe6d8..3694f4c 100644
--- a/lib/SQL/Abstract.pm
+++ b/lib/SQL/Abstract.pm
@@ -26,6 +26,28 @@ sub puke (@) {
   Carp::croak "[$func] Fatal: ", @_;
 }
 
+# original SQLA treated anything false as "use the default"
+# in addition a lot of CPAN seems to supply undef's for "use the default"
+# (say hi to Class::DBI::Sweet)
+sub BUILDARGS {
+  my $class = shift;
+  my $args = { ref $_[0] eq 'HASH' ? %{$_[0]} : @_ };
+
+  defined $args->{$_} or delete $args->{$_}
+    for keys %$args;
+
+  $args;
+}
+
+# many subclasses on CPAN  assume they can dump a bunch of extra new()
+# parameters, and then get back at them via $obj->{foo}. YAY
+# (Class::DBI::Sweet says hi back)
+sub BUILD {
+  my ($self, $args) = @_;
+  %{$self} = (%$args, %$self);
+  $self;
+}
+
 has converter => (is => 'lazy', clearer => 'clear_converter');
 
 has case => (
@@ -132,7 +154,9 @@ sub _build_renderer_roles { () }
 sub _converter_args {
   my ($self) = @_;
   Scalar::Util::weaken($self);
+
   +{
+    sqla_instance => $self,
     lower_case => $self->case,
     default_logic => $self->logic,
     bind_meta => not($self->bindtype eq 'normal'),
@@ -152,6 +176,8 @@ sub _converter_args {
     renderer_will_quote => (
       defined($self->quote_char) and $self->always_quote
     ),
+
+    legacy_convert_handler => ($self->can('_convert') != \&_convert) ? 1 : 0,
   }
 }
 
diff --git a/lib/SQL/Abstract/Converter.pm b/lib/SQL/Abstract/Converter.pm
index c56c702..4798e8d 100644
--- a/lib/SQL/Abstract/Converter.pm
+++ b/lib/SQL/Abstract/Converter.pm
@@ -15,6 +15,13 @@ has lower_case => (
   is => 'ro'
 );
 
+has legacy_convert_handler => (
+  is => 'ro'
+);
+has sqla_instance => (
+  is => 'ro', weak => 1
+);
+
 has default_logic => (
   is => 'ro', coerce => sub { uc($_[0]) }, default => sub { 'OR' }
 );
@@ -115,6 +122,12 @@ sub _ident_to_dq {
 
 sub _maybe_convert_dq {
   my ($self, $dq) = @_;
+
+  # do in void ctx - nothing seems to be using any of this
+  if ($self->legacy_convert_handler and $dq->{type} eq 'Identifier') {
+    $self->sqla_instance->_convert( join '.', @{$dq->{elements}} )
+  }
+
   if (my $c = $self->{where_convert}) {
     Operator({ 'SQL.Naive' => 'apply' }, [
         Identifier($self->_sqlcase($c)),