X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FResultSet.pm;h=b30efa296051ef5bce54665b9c1b4b5e963362a9;hb=a63219bc9b7102be940ea56af8e6cd77960a1c63;hp=cf82b838856c0143336a07e681fa4fa59a8d5650;hpb=aab9e887504907201b3cc0a8c40832efcb43e5dd;p=dbsrgits%2FDBIx-Class.git

diff --git a/lib/DBIx/Class/ResultSet.pm b/lib/DBIx/Class/ResultSet.pm
index cf82b83..b30efa2 100644
--- a/lib/DBIx/Class/ResultSet.pm
+++ b/lib/DBIx/Class/ResultSet.pm
@@ -3,14 +3,15 @@ package DBIx::Class::ResultSet;
 use strict;
 use warnings;
 use overload
-        '0+'     => \&count,
-        'bool'   => sub { 1; },
+        '0+'     => "count",
+        'bool'   => "_bool",
         fallback => 1;
 use Carp::Clan qw/^DBIx::Class/;
 use Data::Page;
 use Storable;
 use DBIx::Class::ResultSetColumn;
 use DBIx::Class::ResultSourceHandle;
+use List::Util ();
 use base qw/DBIx::Class/;
 
 __PACKAGE__->mk_group_accessors('simple' => qw/result_class _source_handle/);
@@ -50,6 +51,10 @@ In the examples below, the following table classes are used:
   __PACKAGE__->belongs_to(artist => 'MyApp::Schema::Artist');
   1;
 
+=head1 OVERLOADING
+
+If a resultset is used as a number it returns the C<count()>.  However, if it is used as a boolean it is always true.  So if you want to check if a result set has any results use C<if $rs != 0>.  C<if $rs> will always be true.
+
 =head1 METHODS
 
 =head2 new
@@ -168,18 +173,26 @@ always return a resultset, even in list context.
 sub search_rs {
   my $self = shift;
 
-  my $rows;
-
-  unless (@_) {                 # no search, effectively just a clone
-    $rows = $self->get_cache;
-  }
-
   my $attrs = {};
   $attrs = pop(@_) if @_ > 1 and ref $_[$#_] eq 'HASH';
   my $our_attrs = { %{$self->{attrs}} };
   my $having = delete $our_attrs->{having};
   my $where = delete $our_attrs->{where};
 
+  my $rows;
+
+  my %safe = (alias => 1, cache => 1);
+
+  unless (
+    (@_ && defined($_[0])) # @_ == () or (undef)
+    || 
+    (keys %$attrs # empty attrs or only 'safe' attrs
+    && List::Util::first { !$safe{$_} } keys %$attrs)
+  ) {
+    # no search, effectively just a clone
+    $rows = $self->get_cache;
+  }
+
   my $new_attrs = { %{$our_attrs}, %{$attrs} };
 
   # merge new attrs into inherited
@@ -929,7 +942,7 @@ Performs an SQL C<COUNT> with the same query as the resultset was built
 with to find the number of elements. If passed arguments, does a search
 on the resultset and counts the results of that.
 
-Note: When using C<count> with C<group_by>, L<DBIX::Class> emulates C<GROUP BY>
+Note: When using C<count> with C<group_by>, L<DBIx::Class> emulates C<GROUP BY>
 using C<COUNT( DISTINCT( columns ) )>. Some databases (notably SQLite) do
 not support C<DISTINCT> with multiple columns. If you are using such a
 database, you should only use columns from the main table in your C<group_by>
@@ -987,6 +1000,10 @@ sub _count { # Separated out so pager can get the full count
   return $count;
 }
 
+sub _bool {
+  return 1;
+}
+
 =head2 count_literal
 
 =over 4
@@ -2115,7 +2132,12 @@ See L<DBIx::Class::Schema/throw_exception> for details.
 
 sub throw_exception {
   my $self=shift;
-  $self->_source_handle->schema->throw_exception(@_);
+  if (ref $self) {
+    $self->_source_handle->schema->throw_exception(@_)
+  } else {
+    croak(@_);
+  }
+
 }
 
 # XXX: FIXME: Attributes docs need clearing up
@@ -2204,7 +2226,7 @@ return a column named C<count(employeeid)> in the above example.
 =over 4
 
 Indicates additional columns to be selected from storage.  Works the same as
-L<select> but adds columns to the selection.
+L</select> but adds columns to the selection.
 
 =back
 
@@ -2212,7 +2234,7 @@ L<select> but adds columns to the selection.
 
 =over 4
 
-Indicates additional column names for those added via L<+select>.
+Indicates additional column names for those added via L</+select>.
 
 =back
 
@@ -2334,6 +2356,7 @@ If you want to fetch related objects from other tables as well, see C<prefetch>
 below.
 
 For more help on using joins with search, see L<DBIx::Class::Manual::Joining>.
+
 =head2 prefetch
 
 =over 4