Updated cookbook example

[dbsrgits/DBIx-Class.git] / lib / DBIx / Class / Manual / Cookbook.pod

diff --git a/lib/DBIx/Class/Manual/Cookbook.pod b/lib/DBIx/Class/Manual/Cookbook.pod
index 4192ee3..52bb889 100644 (file)
--- a/lib/DBIx/Class/Manual/Cookbook.pod
+++ b/lib/DBIx/Class/Manual/Cookbook.pod
@@ -107,12 +107,15 @@ to access the returned value:
   );
 
   # Equivalent SQL:
-  # SELECT name name, LENGTH( name ) name_length
+  # SELECT name name, LENGTH( name )
   # FROM artist
 
-If your alias exists as a column in your base class (i.e. it was added
-with C<add_columns>), you just access it as normal. Our C<Artist>
-class has a C<name> column, so we just use the C<name> accessor:
+Note that the C< as > attribute has absolutely nothing to with the sql
+syntax C< SELECT foo AS bar > (see the documentation in
+L<DBIx::Class::ResultSet/ATTRIBUTES>).  If your alias exists as a
+column in your base class (i.e. it was added with C<add_columns>), you
+just access it as normal. Our C<Artist> class has a C<name> column, so
+we just use the C<name> accessor:
 
   my $artist = $rs->first();
   my $name = $artist->name();
@@ -139,7 +142,7 @@ any of your aliases using either of these:
       select => [
         { distinct => [ $source->columns ] }
       ],
-      as => [ $source->columns ]
+      as => [ $source->columns ] # remember 'as' is not the same as SQL AS :-)
     }
   );
 
@@ -176,6 +179,10 @@ L<DBIx::Class> supports C<GROUP BY> as follows:
   # LEFT JOIN cd cds ON ( cds.artist = me.artistid )
   # GROUP BY name
 
+Please see L<DBIx::Class::ResultSet/ATTRIBUTES> documentation if you
+are in any way unsure about the use of the attributes above (C< join
+>, C< select >, C< as > and C< group_by >).
+
 =head3 Predefined searches
 
 You can write your own L<DBIx::Class::ResultSet> class by inheriting from it
@@ -415,7 +422,7 @@ ways, the obvious one is to use search:
     {},
     { 
        select => [ { sum => 'Cost' } ],
-       as     => [ 'total_cost' ],
+       as     => [ 'total_cost' ], # remember this 'as' is for DBIx::Class::ResultSet not SQL
     }
   );
   my $tc = $rs->first->get_column('total_cost');
@@ -564,11 +571,13 @@ It's as simple as overriding the C<new> method.  Note the use of
 C<next::method>.
 
   sub new {
-    my ( $class, $attrs ) = @_;
+    my ( $self, $attrs ) = @_;
 
     $attrs->{foo} = 'bar' unless defined $attrs->{foo};
 
-    $class->next::method($attrs);
+    $self->next::method($attrs);
+
+    return $self;
   }
 
 For more information about C<next::method>, look in the L<Class::C3>