X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FResultSet.pm;h=ed2d1449e1b24272a950d567b1efbe89b1499a34;hb=f1952f5c69e092d9ce416586f29942f8c2f66bce;hp=c17ca808203144453894bb4989a0c21297012988;hpb=1f279bcfdaa31b01fbf1c974012a483b209b75f7;p=dbsrgits%2FDBIx-Class.git

diff --git a/lib/DBIx/Class/ResultSet.pm b/lib/DBIx/Class/ResultSet.pm
index c17ca80..ed2d144 100644
--- a/lib/DBIx/Class/ResultSet.pm
+++ b/lib/DBIx/Class/ResultSet.pm
@@ -661,7 +661,6 @@ sub cursor {
   my ($self) = @_;
 
   my $attrs = $self->_resolved_attrs_copy;
-  $attrs->{_virtual_order_by} = $self->_gen_virtual_order;
 
   return $self->{cursor}
     ||= $self->result_source->storage->select($attrs->{from}, $attrs->{select},
@@ -714,7 +713,6 @@ sub single {
   }
 
   my $attrs = $self->_resolved_attrs_copy;
-  $attrs->{_virtual_order_by} = $self->_gen_virtual_order;
 
   if ($where) {
     if (defined $attrs->{where}) {
@@ -742,15 +740,6 @@ sub single {
   return (@data ? ($self->_construct_object(@data))[0] : undef);
 }
 
-# _gen_virtual_order
-#
-# This is a horrble hack, but seems like the best we can do at this point
-# Some limit emulations (Top) require an ordered resultset in order to 
-# function at all. So supply a PK order to be used if necessary
-
-sub _gen_virtual_order {
-  return [ shift->result_source->primary_columns ];
-}
 
 # _is_unique_query
 #
@@ -1329,7 +1318,7 @@ sub _rs_update_delete {
 
     my $subrs = (ref $self)->new($rsrc, $attrs);
 
-    return $self->result_source->storage->subq_update_delete($subrs, $op, $values);
+    return $self->result_source->storage->_subq_update_delete($subrs, $op, $values);
   }
   else {
     return $rsrc->storage->$op(
@@ -1936,7 +1925,22 @@ B<NOTE>: This feature is still experimental.
 
 =cut
 
-sub as_query { return shift->cursor->as_query(@_) }
+sub as_query {
+  my $self = shift;
+
+  my $attrs = $self->_resolved_attrs_copy;
+
+  # For future use:
+  #
+  # in list ctx:
+  # my ($sql, \@bind, \%dbi_bind_attrs) = _select_args_to_query (...)
+  # $sql also has no wrapping parenthesis in list ctx
+  #
+  my $sqlbind = $self->result_source->storage
+    ->_select_args_to_query ($attrs->{from}, $attrs->{select}, $attrs->{where}, $attrs);
+
+  return $sqlbind;
+}
 
 =head2 find_or_new
 
@@ -1977,8 +1981,10 @@ sub find_or_new {
   my $self     = shift;
   my $attrs    = (@_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {});
   my $hash     = ref $_[0] eq 'HASH' ? shift : {@_};
-  my $exists   = $self->find($hash, $attrs);
-  return defined $exists ? $exists : $self->new_result($hash);
+  if (keys %$hash and my $row = $self->find($hash, $attrs) ) {
+    return $row;
+  }
+  return $self->new_result($hash);
 }
 
 =head2 create
@@ -2108,8 +2114,10 @@ sub find_or_create {
   my $self     = shift;
   my $attrs    = (@_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {});
   my $hash     = ref $_[0] eq 'HASH' ? shift : {@_};
-  my $exists   = $self->find($hash, $attrs);
-  return defined $exists ? $exists : $self->create($hash);
+  if (keys %$hash and my $row = $self->find($hash, $attrs) ) {
+    return $row;
+  }
+  return $self->create($hash);
 }
 
 =head2 update_or_create
@@ -2434,10 +2442,17 @@ sub _resolve_from {
   my $source = $self->result_source;
   my $attrs = $self->{attrs};
 
-  my $from = $attrs->{from}
-    || [ { $attrs->{alias} => $source->from } ];
+  my $from = [ @{
+      $attrs->{from}
+        ||
+      [{
+        -source_handle => $source->handle,
+        -alias => $attrs->{alias},
+        $attrs->{alias} => $source->from,
+      }]
+  }];
 
-  my $seen = $attrs->{seen_join} || {};
+  my $seen = { %{$attrs->{seen_join} || {} } };
 
   # we need to take the prefetch the attrs into account before we
   # ->_resolve_join as otherwise they get lost - captainL
@@ -2540,7 +2555,11 @@ sub _resolved_attrs {
     push( @{ $attrs->{as} }, @$adds );
   }
 
-  $attrs->{from} ||= [ { $self->{attrs}{alias} => $source->from } ];
+  $attrs->{from} ||= [ {
+    -source_handle => $source->handle,
+    -alias => $self->{attrs}{alias},
+    $self->{attrs}{alias} => $source->from,
+  } ];
 
   if ( exists $attrs->{join} || exists $attrs->{prefetch} ) {
     my $join = delete $attrs->{join} || {};
@@ -2571,20 +2590,30 @@ sub _resolved_attrs {
     $attrs->{order_by} = [];
   }
 
+  # If the order_by is otherwise empty - we will use this for TOP limit
+  # emulation and the like.
+  # Although this is needed only if the order_by is not defined, it is
+  # actually cheaper to just populate this rather than properly examining
+  # order_by (stuf like [ {} ] and the like)
+  $attrs->{_virtual_order_by} = [ $self->result_source->primary_columns ];
+
+
   my $collapse = $attrs->{collapse} || {};
+
   if ( my $prefetch = delete $attrs->{prefetch} ) {
     $prefetch = $self->_merge_attr( {}, $prefetch );
-    my @pre_order;
-    foreach my $p ( ref $prefetch eq 'ARRAY' ? @$prefetch : ($prefetch) ) {
-
-      # bring joins back to level of current class
-      my $join_map = $self->_joinpath_aliases ($attrs->{from}, $attrs->{seen_join});
-      my @prefetch =
-        $source->_resolve_prefetch( $p, $alias, $join_map, \@pre_order, $collapse );
-      push( @{ $attrs->{select} }, map { $_->[0] } @prefetch );
-      push( @{ $attrs->{as} },     map { $_->[1] } @prefetch );
-    }
-    push( @{ $attrs->{order_by} }, @pre_order );
+
+    my $prefetch_ordering = [];
+
+    my $join_map = $self->_joinpath_aliases ($attrs->{from}, $attrs->{seen_join});
+
+    my @prefetch =
+      $source->_resolve_prefetch( $prefetch, $alias, $join_map, $prefetch_ordering, $collapse );
+
+    push( @{ $attrs->{select} }, map { $_->[0] } @prefetch );
+    push( @{ $attrs->{as} },     map { $_->[1] } @prefetch );
+
+    push( @{ $attrs->{order_by} }, @$prefetch_ordering );
   }
 
   if (delete $attrs->{distinct}) {
@@ -2613,7 +2642,7 @@ sub _joinpath_aliases {
 
     my $p = $paths;
     $p = $p->{$_} ||= {} for @{$j->[0]{-join_path}};
-    push @{$p->{-join_aliases} }, $j->[0]{-join_alias};
+    push @{$p->{-join_aliases} }, $j->[0]{-alias};
   }
 
   return $paths;
@@ -3266,9 +3295,21 @@ with a father in the person table, we could explicitly use C<INNER JOIN>:
     # SELECT child.* FROM person child
     # INNER JOIN person father ON child.father_id = father.id
 
-If you need to express really complex joins or you need a subselect, you
+You can select from a subquery by passing a resultset to from as follows.
+
+    $schema->resultset('Artist')->search( 
+        undef, 
+        {   alias => 'artist2',
+            from  => [ { artist2 => $artist_rs->as_query } ],
+        } );
+
+    # and you'll get sql like this..
+    # SELECT artist2.artistid, artist2.name, artist2.rank, artist2.charfield FROM 
+    #   ( SELECT me.artistid, me.name, me.rank, me.charfield FROM artists me ) artist2
+
+If you need to express really complex joins, you
 can supply literal SQL to C<from> via a scalar reference. In this case
-the contents of the scalar will replace the table name asscoiated with the
+the contents of the scalar will replace the table name associated with the
 resultsource.
 
 WARNING: This technique might very well not work as expected on chained