sub register_extensions {
my ($self, $sqla) = @_;
foreach my $stmt ($sqla->statement_list) {
- $sqla->wrap_expander($stmt => sub ($orig) {
+ $sqla->wrap_expander($stmt => sub {
+ my ($orig) = @_;
sub {
my ($self, $name, $args) = @_;
- my %args = %$args;
+ my %args = (
+ %$args,
+ (ref($args->{order_by}) eq 'HASH'
+ ? %{$args->{order_by}}
+ : ())
+ );
+ my %overrides;
foreach my $clause (map /^!(.*)$/, keys %args) {
my $override = delete $args{"!${clause}"};
- $args{$clause} = (
+ $overrides{$clause} = (
ref($override) eq 'CODE'
- ? $override->($args{$clause})
+ ? $self->$override($args{$clause})
: $override
);
}
- $self->$orig($name, \%args);
+ $self->$orig($name, { %$args, %overrides });
}
});
}
}
1;
+
+__END__
+
+=head1 NAME
+
+SQL::Abstract::Plugin::BangOverrides
+
+=head2 SYNOPSIS
+
+ $sqla->plugin('+BangOverrides');
+ ...
+ profit();
+
+=head1 METHODS
+
+=head2 register_extensions
+
+Wraps all currently existing clause based statements such that when a clause
+of '!name' is encountered, if its value is a coderef, it's called with the
+original value of the 'name' clause and expected to return a replacement, and
+if not, it's simply used as a direct replacement.
+
+So, given appropriate DBIC setup:
+
+ $s->storage->sqlmaker->plugin('+ExtraClauses')->plugin('+BangOverrides');
+
+ my $rs2 = $s->resultset('Foo')->search({
+ -op => [ '=', { -ident => 'outer.y' }, { -ident => 'me.x' } ]
+ });
+ # (SELECT me.x, me.y, me.z FROM foo me WHERE ( outer.y = me.x ))
+
+ my $rs3 = $rs2->search({}, {
+ '!from' => sub { my ($sqla, $from) = @_;
+ my $base = $sqla->expand_expr({ -old_from => $from });
+ return [ $base, -join => [ 'wub', on => [ 'me.z' => 'wub.z' ] ] ];
+ }
+ });
+ # (SELECT me.x, me.y, me.z FROM foo me JOIN wub ON me.z = wub.z WHERE ( outer.y = me.x ))
+
+ my $rs4 = $rs3->search({}, {
+ '!with' => [ [ qw(wub x y z) ], $s->resultset('Bar')->as_query ],
+ });
+ # (WITH wub(x, y, z) AS (SELECT me.a, me.b, me.c FROM bar me) SELECT me.x, me.y, me.z FROM foo me JOIN wub ON me.z = wub.z WHERE ( outer.y = me.x ))
+
+ my $rs5 = $rs->search({}, { select => [ { -coalesce => [ { -ident => 'x' }, { -value => 7 } ] } ] });
+ # (SELECT -COALESCE( -IDENT( x ), -VALUE( 7 ) ) FROM foo me WHERE ( z = ? ))
+
+ my $rs6 = $rs->search({}, { '!select' => [ { -coalesce => [ { -ident => 'x' }, { -value => 7 } ] } ] });
+ # (SELECT COALESCE(x, ?) FROM foo me WHERE ( z = ? ))
+
+=cut