Removed useless line of code in many_to_many

[dbsrgits/DBIx-Class.git] / lib / DBIx / Class / Relationship / ManyToMany.pm

diff --git a/lib/DBIx/Class/Relationship/ManyToMany.pm b/lib/DBIx/Class/Relationship/ManyToMany.pm
index 163ac36..ef63b08 100644 (file)
--- a/lib/DBIx/Class/Relationship/ManyToMany.pm
+++ b/lib/DBIx/Class/Relationship/ManyToMany.pm
@@ -3,8 +3,17 @@ package # hide from PAUSE
 
 use strict;
 use warnings;
-use warnings::register;
-use Sub::Name ();
+
+use DBIx::Class::Carp;
+use Sub::Name 'subname';
+use Scalar::Util 'blessed';
+use DBIx::Class::_Util 'fail_on_internal_wantarray';
+use namespace::clean;
+
+our %_pod_inherit_config =
+  (
+   class_map => { 'DBIx::Class::Relationship::ManyToMany' => 'DBIx::Class::Relationship' }
+  );
 
 sub many_to_many {
   my ($class, $meth, $rel, $f_rel, $rel_attrs) = @_;
@@ -28,16 +37,20 @@ sub many_to_many {
 
     for ($add_meth, $remove_meth, $set_meth, $rs_meth) {
       if ( $class->can ($_) ) {
-        warnings::warnif(<<"EOW")
+        carp (<<"EOW") unless $ENV{DBIC_OVERWRITE_HELPER_METHODS_OK};
+
 ***************************************************************************
-The many-to-many relationship $meth is trying to create a utility method called
-$_. This will overwrite the existing method on $class. You almost certainly
-want to rename your method or the many-to-many relationship, as your method
-will not be callable (it will use the one from the relationship instead.)
+The many-to-many relationship '$meth' is trying to create a utility method
+called $_.
+This will completely overwrite one such already existing method on class
+$class.
 
-To disable this warning add the following to $class
+You almost certainly want to rename your method or the many-to-many
+relationship, as the functionality of the original method will not be
+accessible anymore.
 
-  no warnings 'DBIx::Class::Relationship::ManyToMany';
+To disable this warning set to a true value the environment variable
+DBIC_OVERWRITE_HELPER_METHODS_OK
 
 ***************************************************************************
 EOW
@@ -47,25 +60,25 @@ EOW
     $rel_attrs->{alias} ||= $f_rel;
 
     my $rs_meth_name = join '::', $class, $rs_meth;
-    *$rs_meth_name = Sub::Name::subname $rs_meth_name, sub {
+    *$rs_meth_name = subname $rs_meth_name, sub {
       my $self = shift;
       my $attrs = @_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {};
-      my @args = ($f_rel, @_ > 0 ? @_ : undef, { %{$rel_attrs||{}}, %$attrs });
       my $rs = $self->search_related($rel)->search_related(
         $f_rel, @_ > 0 ? @_ : undef, { %{$rel_attrs||{}}, %$attrs }
       );
-         return $rs;
+      return $rs;
     };
 
     my $meth_name = join '::', $class, $meth;
-    *$meth_name = Sub::Name::subname $meth_name, sub {
-               my $self = shift;
-               my $rs = $self->$rs_meth( @_ );
-               return (wantarray ? $rs->all : $rs);
-       };
+    *$meth_name = subname $meth_name, sub {
+      DBIx::Class::_ENV_::ASSERT_NO_INTERNAL_WANTARRAY and wantarray and my $sog = fail_on_internal_wantarray($_[0]);
+      my $self = shift;
+      my $rs = $self->$rs_meth( @_ );
+      return (wantarray ? $rs->all : $rs);
+    };
 
     my $add_meth_name = join '::', $class, $add_meth;
-    *$add_meth_name = Sub::Name::subname $add_meth_name, sub {
+    *$add_meth_name = subname $add_meth_name, sub {
       my $self = shift;
       @_ > 0 or $self->throw_exception(
         "${add_meth} needs an object or hashref"
@@ -80,43 +93,55 @@ EOW
       my $obj;
       if (ref $_[0]) {
         if (ref $_[0] eq 'HASH') {
-          $obj = $f_rel_rs->create($_[0]);
+          $obj = $f_rel_rs->find_or_create($_[0]);
         } else {
           $obj = $_[0];
         }
       } else {
-        $obj = $f_rel_rs->create({@_});
+        $obj = $f_rel_rs->find_or_create({@_});
       }
 
       my $link_vals = @_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {};
       my $link = $self->search_related($rel)->new_result($link_vals);
       $link->set_from_related($f_rel, $obj);
       $link->insert();
-         return $obj;
+      return $obj;
     };
 
     my $set_meth_name = join '::', $class, $set_meth;
-    *$set_meth_name = Sub::Name::subname $set_meth_name, sub {
+    *$set_meth_name = subname $set_meth_name, sub {
       my $self = shift;
       @_ > 0 or $self->throw_exception(
         "{$set_meth} needs a list of objects or hashrefs"
       );
       my @to_set = (ref($_[0]) eq 'ARRAY' ? @{ $_[0] } : @_);
-      $self->search_related($rel, {})->delete;
-      $self->$add_meth($_) for (@to_set);
+      # if there is a where clause in the attributes, ensure we only delete
+      # rows that are within the where restriction
+      if ($rel_attrs && $rel_attrs->{where}) {
+        $self->search_related( $rel, $rel_attrs->{where},{join => $f_rel})->delete;
+      } else {
+        $self->search_related( $rel, {} )->delete;
+      }
+      # add in the set rel objects
+      $self->$add_meth($_, ref($_[1]) ? $_[1] : {}) for (@to_set);
     };
 
     my $remove_meth_name = join '::', $class, $remove_meth;
-    *$remove_meth_name = Sub::Name::subname $remove_meth_name, sub {
-      my $self = shift;
-      @_ > 0 && ref $_[0] ne 'HASH'
-        or $self->throw_exception("${remove_meth} needs an object");
-      my $obj = shift;
+    *$remove_meth_name = subname $remove_meth_name, sub {
+      my ($self, $obj) = @_;
+      $self->throw_exception("${remove_meth} needs an object")
+        unless blessed ($obj);
       my $rel_source = $self->search_related($rel)->result_source;
       my $cond = $rel_source->relationship_info($f_rel)->{cond};
-      my $link_cond = $rel_source->resolve_condition(
-        $cond, $obj, $f_rel
+      my ($link_cond, $crosstable) = $rel_source->_resolve_condition(
+        $cond, $obj, $f_rel, $f_rel
       );
+
+      $self->throw_exception(
+        "Custom relationship '$rel' does not resolve to a join-free condition, "
+       ."unable to use with the ManyToMany helper '$f_rel'"
+      ) if $crosstable;
+
       $self->search_related($rel, $link_cond)->delete;
     };