From: Daniel Westermann-Clark <danieltwc@cpan.org>
Date: Tue, 10 Jan 2006 22:29:01 +0000 (+0000)
Subject: - Update indentation (again) to be consistent with code
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=35d4fe78ded60b3ae56daf65f9ae885abbbe3513;p=dbsrgits%2FDBIx-Class-Historic.git

- Update indentation (again) to be consistent with code
- Change $iter to $rs in Manual::Intro
- Provide more examples of ResultSet usage in Manual::Intro
---

diff --git a/lib/DBIx/Class/Manual/Cookbook.pod b/lib/DBIx/Class/Manual/Cookbook.pod
index bc9d12c..bd0e6b8 100644
--- a/lib/DBIx/Class/Manual/Cookbook.pod
+++ b/lib/DBIx/Class/Manual/Cookbook.pod
@@ -8,31 +8,31 @@ DBIx::Class::Manual::Cookbook - Miscellaneous recipes
 
 Sometimes you need to formulate a query using specific operators:
 
-    my @albums = MyApp::DB::Album->search({
-        artist => { 'like', '%Lamb%' },
-        title  => { 'like', '%Fear of Fours%' },
-    });
+  my @albums = MyApp::DB::Album->search({
+    artist => { 'like', '%Lamb%' },
+    title  => { 'like', '%Fear of Fours%' },
+  });
 
 This results in something like the following C<WHERE> clause:
 
-    WHERE artist LIKE '%Lamb%' AND title LIKE '%Fear of Fours%'
+  WHERE artist LIKE '%Lamb%' AND title LIKE '%Fear of Fours%'
 
 Other queries might require slightly more complex logic:
 
-    my @albums = MyApp::DB::Album->search({
-        -or => [
-            -and => [
-                artist => { 'like', '%Smashing Pumpkins%' },
-                title  => 'Siamese Dream',
-            ],
-            artist => 'Starchildren',
-        ],
-    });
+  my @albums = MyApp::DB::Album->search({
+    -or => [
+      -and => [
+        artist => { 'like', '%Smashing Pumpkins%' },
+        title  => 'Siamese Dream',
+      ],
+      artist => 'Starchildren',
+    ],
+  });
 
 This results in the following C<WHERE> clause:
 
-    WHERE ( artist LIKE '%Smashing Pumpkins%' AND title = 'Siamese Dream' )
-          OR artist = 'Starchildren'
+  WHERE ( artist LIKE '%Smashing Pumpkins%' AND title = 'Siamese Dream' )
+    OR artist = 'Starchildren'
 
 For more information on generating complex queries, see
 L<SQL::Abstract/WHERE CLAUSES>.
@@ -43,9 +43,9 @@ If you find yourself quitting an app with Control-C a lot during
 development, you might like to put the following signal handler in
 your main database class to make sure it disconnects cleanly:
 
-    $SIG{INT} = sub {
-        __PACKAGE__->storage->dbh->disconnect;
-    };
+  $SIG{INT} = sub {
+    __PACKAGE__->storage->dbh->disconnect;
+  };
 
 =head2 Using joins and prefetch
 
@@ -54,117 +54,117 @@ See L<DBIx::Class::ResultSet/ATTRIBUTES>.
 =head2 Transactions
 
 As of version 0.04001, there is improved transaction support in
-L<DBIx::Class::Storage::DBI>. Here is an example of the recommended
+L<DBIx::Class::Storage::DBI>.  Here is an example of the recommended
 way to use it:
 
-    my $genus = Genus->find(12);
+  my $genus = Genus->find(12);
+  eval {
+    MyDB->txn_begin;
+    $genus->add_to_species({ name => 'troglodyte' });
+    $genus->wings(2);
+    $genus->update;
+    cromulate($genus); # Can have a nested transation
+    MyDB->txn_commit;
+  };
+  if ($@) {
+    # Rollback might fail, too
     eval {
-        MyDB->txn_begin;
-        $genus->add_to_species({ name => 'troglodyte' });
-        $genus->wings(2);
-        $genus->update;
-        cromulate($genus); # Can have a nested transation
-        MyDB->txn_commit;
+      MyDB->txn_rollback
     };
-    if ($@) {
-        # Rollback might fail, too
-        eval {
-            MyDB->txn_rollback
-        };
-    }
+  }
 
 Currently, a nested commit will do nothing and a nested rollback will
-die. The code at each level must be sure to call rollback in the case
+die.  The code at each level must be sure to call rollback in the case
 of an error, to ensure that the rollback will propagate to the top
-level and be issued. Support for savepoints and for true nested
+level and be issued.  Support for savepoints and for true nested
 transactions (for databases that support them) will hopefully be added
 in the future.
 
 =head2 Many-to-many relationships
 
-This is not as easy as it could be, but it's possible. Here's an
+This is not as easy as it could be, but it's possible.  Here's an
 example to illustrate:
 
-    # Set up inherited connection information
-    package MyApp::DBIC; 
-    use base qw/DBIx::Class/;
-
-    __PACKAGE__->load_components(qw/PK::Auto::SQLite Core DB/);
-    __PACKAGE__->connection(...);
-
-    # Set up a class for the 'authors' table
-    package MyApp::DBIC::Author;
-    use base qw/MyApp::DBIC/;
-
-    __PACKAGE__->table('authors');
-    __PACKAGE__->add_columns(qw/authID first_name last_name/);
-    __PACKAGE__->set_primary_key(qw/authID/);
-
-    # Define relationship to the link table
-    __PACKAGE__->has_many('b2a' => 'MyApp::DBIC::Book2Author', 'authID');
-
-    # Create the accessor for books from the Author class
-    sub books {
-      my ($self) = @_;
-      return MyApp::DBIC::Book->search(
-        { 'b2a.authID' => $self->authID }, # WHERE clause
-        { join => 'b2a' } # join condition (part of search attrs)
-        # 'b2a' refers to the relationship named earlier in the Author class.
-        # 'b2a.authID' refers to the authID column of the b2a relationship,
-        # which becomes accessible in the search by being joined.  
-      );
-    }
-
-    # Define the link table class
-    package MyApp::DBIC::Book2Author;
-    use base qw/MyApp::DBIC/;
-
-    __PACKAGE__->table('book2author');
-    __PACKAGE__->add_columns(qw/bookID authID/);
-    __PACKAGE__->set_primary_key(qw/bookID authID/);
-
-    __PACKAGE__->belongs_to('authID' => 'MyApp::DBIC::Author');
-    __PACKAGE__->belongs_to('bookID' => 'MyApp::DBIC::Book');
-
-    package MyApp::DBIC::Book;
-    use base qw/MyApp::DBIC/;
-
-    __PACKAGE__->table('books');
-    __PACKAGE__->add_columns(qw/bookID title edition isbn publisher year/);
-    __PACKAGE__->set_primary_key(qw/bookID/);
-    
-    __PACKAGE__->has_many('b2a' => 'MyApp::DBIC::Book2Author', 'bookID');
-
-
-    # Returns an author record where the bookID field of the
-    # book2author table equals the bookID of the books (using the
-    # bookID relationship table)
-    sub authors {
-        my ($self) = @_;
-        return MyApp::DBIC::Author->search(
-            { 'b2a.bookID' => $self->bookID }, # WHERE clause
-            { join => 'b2a' } # JOIN condition
-        ); 
-    }
+  # Set up inherited connection information
+  package MyApp::DBIC; 
+  use base qw/DBIx::Class/;
+
+  __PACKAGE__->load_components(qw/PK::Auto::SQLite Core DB/);
+  __PACKAGE__->connection(...);
+
+  # Set up a class for the 'authors' table
+  package MyApp::DBIC::Author;
+  use base qw/MyApp::DBIC/;
+
+  __PACKAGE__->table('authors');
+  __PACKAGE__->add_columns(qw/authID first_name last_name/);
+  __PACKAGE__->set_primary_key(qw/authID/);
+
+  # Define relationship to the link table
+  __PACKAGE__->has_many('b2a' => 'MyApp::DBIC::Book2Author', 'authID');
+
+  # Create the accessor for books from the Author class
+  sub books {
+    my ($self) = @_;
+    return MyApp::DBIC::Book->search(
+      { 'b2a.authID' => $self->authID }, # WHERE clause
+      { join => 'b2a' } # join condition (part of search attrs)
+      # 'b2a' refers to the relationship named earlier in the Author class.
+      # 'b2a.authID' refers to the authID column of the b2a relationship,
+      # which becomes accessible in the search by being joined.
+    );
+  }
+
+  # Define the link table class
+  package MyApp::DBIC::Book2Author;
+  use base qw/MyApp::DBIC/;
+
+  __PACKAGE__->table('book2author');
+  __PACKAGE__->add_columns(qw/bookID authID/);
+  __PACKAGE__->set_primary_key(qw/bookID authID/);
+
+  __PACKAGE__->belongs_to('authID' => 'MyApp::DBIC::Author');
+  __PACKAGE__->belongs_to('bookID' => 'MyApp::DBIC::Book');
+
+  package MyApp::DBIC::Book;
+  use base qw/MyApp::DBIC/;
+
+  __PACKAGE__->table('books');
+  __PACKAGE__->add_columns(qw/bookID title edition isbn publisher year/);
+  __PACKAGE__->set_primary_key(qw/bookID/);
+  
+  __PACKAGE__->has_many('b2a' => 'MyApp::DBIC::Book2Author', 'bookID');
+
+
+  # Returns an author record where the bookID field of the
+  # book2author table equals the bookID of the books (using the
+  # bookID relationship table)
+  sub authors {
+    my ($self) = @_;
+    return MyApp::DBIC::Author->search(
+      { 'b2a.bookID' => $self->bookID }, # WHERE clause
+      { join => 'b2a' } # JOIN condition
+    ); 
+  }
 
 =head2 Setting default values
 
-It's as simple as overriding the C<new> method. Note the use of
+It's as simple as overriding the C<new> method.  Note the use of
 C<next::method>.
 
-    sub new {
-        my ( $class, $attrs ) = @_;
+  sub new {
+    my ( $class, $attrs ) = @_;
 
-        $attrs->{foo} = 'bar' unless defined $attrs->{foo};
+    $attrs->{foo} = 'bar' unless defined $attrs->{foo};
 
-        $class->next::method($attrs);
-    }
+    $class->next::method($attrs);
+  }
 
 =head2 Stringification
 
 Employ the standard stringification technique by using the C<overload>
-module. Replace C<foo> with the column/method of your choice.
+module.  Replace C<foo> with the column/method of your choice.
 
-    use overload '""' => 'foo', fallback => 1;
+  use overload '""' => 'foo', fallback => 1;
 
 =cut
diff --git a/lib/DBIx/Class/Manual/FAQ.pod b/lib/DBIx/Class/Manual/FAQ.pod
index 131f4a0..ff49a3b 100644
--- a/lib/DBIx/Class/Manual/FAQ.pod
+++ b/lib/DBIx/Class/Manual/FAQ.pod
@@ -4,7 +4,7 @@ DBIx::Class::Manual::FAQ - Frequently asked questions
 
 =head1 GENERAL
 
-=head2 What is the point of this module? Is it a fork of Class::DBI?
+=head2 What is the point of this module?  Is it a fork of Class::DBI?
 
 This is an alternative to L<Class::DBI>, intended to provide greater
 functionality and simplicity.
@@ -29,13 +29,13 @@ release for people to test against.
 
 =head2 Where can I go for support?
 
-    Mailing list: http://lists.rawmode.org/mailman/listinfo/dbix-class/
+  Mailing list: http://lists.rawmode.org/mailman/listinfo/dbix-class/
 
-    SVN: http://dev.catalyst.perl.org/repos/bast/trunk/DBIx-Class/
+  SVN: http://dev.catalyst.perl.org/repos/bast/trunk/DBIx-Class/
 
-    Wiki: http://dbix-class.shadowcatsystems.co.uk/
+  Wiki: http://dbix-class.shadowcatsystems.co.uk/
 
-    IRC: irc.perl.org#dbix-class
+  IRC: irc.perl.org#dbix-class
 
 =head1 POSTGRESQL-SPECIFIC PROBLEMS
 
@@ -45,7 +45,7 @@ Older L<DBI> and L<DBD::Pg> versions do not handle C<last_insert_id>
 correctly, causing code that uses auto-incrementing primary key
 columns to fail with a message such as:
 
-    Can't get last insert id at /.../DBIx/Class/Row.pm line 95
+  Can't get last insert id at /.../DBIx/Class/Row.pm line 95
 
 In particular the RHEL 4 and FC3 Linux distributions both ship with
 combinations of L<DBI> and L<DBD::Pg> modules that do not work
diff --git a/lib/DBIx/Class/Manual/Intro.pod b/lib/DBIx/Class/Manual/Intro.pod
index 446592f..f288db6 100644
--- a/lib/DBIx/Class/Manual/Intro.pod
+++ b/lib/DBIx/Class/Manual/Intro.pod
@@ -6,67 +6,72 @@ DBIx::Class::Manual::Intro - Introduction to DBIx::Class
 
 So, you are bored with SQL, and want a native Perl interface for your
 database?  Or you've been doing this for a while with L<Class::DBI>,
-and think there's a better way? You've come to the right place. Let's
-look at how you can set and use your first native L<DBIx::Class> tree.
+and think there's a better way?  You've come to the right place.
+Let's look at how you can set and use your first native L<DBIx::Class>
+tree.
 
-First we'll see how you can set up your classes yourself. If you want
+First we'll see how you can set up your classes yourself.  If you want
 them to be auto-discovered, just skip to the next section, which shows
 you how to use L<DBIx::Class::Loader>.
 
 =head2 Setting it up manually
 
-First, you'll need a base class. It should inherit from DBIx::Class
-like this:
+First, you'll need a base class.  It should inherit from
+L<DBIx::Class> like this:
 
-    package MyApp::DB;
-    use base qw/DBIx::Class/;
+  package MyApp::DB;
+  use base qw/DBIx::Class/;
 
-You will also want to load some of L<DBIx::Class>'s components.
-L<DBIx::Class::Core> provides a good basic set. In addition you'll
-have to use either L<DBIx::Class::Schema> or L<DBIx::Class::DB> We'll
-use C<DB> in this introduction, since it involves less magic.
-L<Schema> is mostly useful if you want to use multiple database
+You will also want to load some of the L<DBIx::Class> components.
+L<DBIx::Class::Core> provides a good starter set.  In addition you'll
+have to use either L<DBIx::Class::Schema> or L<DBIx::Class::DB>.
+We'll use C<DB> in this introduction, since it involves less magic.
+C<Schema> is mostly useful if you want to use multiple database
 connections.
 
-    __PACKAGE__->load_components(qw/Core DB/);
+  __PACKAGE__->load_components(qw/Core DB/);
 
-If you want serial/auto-incremental primary keys, you'll need to add
-the apropriate component for your db as well, for example. The
-L<DBIx::Class::PK::Auto> modules help L<DBIx::Class> keep up with
-newly generated keys in auto increment database fields.
+If you want serial/auto-incrementing primary keys, you should use the
+L<DBIx::Class::PK::Auto> component for your database.  For example, if
+you're using SQLite add C<PK::Auto::SQLite> to the list:
 
-    __PACKAGE__->load_components(qw/PK::Auto::SQLite Core DB/);
+  __PACKAGE__->load_components(qw/PK::Auto::SQLite Core DB/);
 
-Once you've loaded the components, it's time to  set up your connection:
+C<PK::Auto> classes exist for many databases; see
+L<DBIx::Class::PK::Auto> for more information.
 
-    __PACKAGE__->connection('dbi:SQLite:/home/me/myapp/my.db');
+Once you've loaded the components, it's time to set up your
+connection:
 
-This method is similar to the normal L<DBI>, and can take username,
-password, and L<DBI> attribute hash as well as the DSN.
+  __PACKAGE__->connection('dbi:SQLite:/home/me/myapp/my.db');
+
+This method is similar to the normal L<DBI> C<connect> method, and can
+take username, password, and L<DBI> attribute hash as well as the DSN.
 
 With that out of the way, we can define our first table class:
 
-    package MyApp::DB::Album;
-    use base qw/MyApp::DB/;
+  package MyApp::DB::Album;
+  use base qw/MyApp::DB/;
 
 Then we specify which table it uses,
 
-    __PACKAGE__->table('album');
+  __PACKAGE__->table('album');
 
 and specify which columns it has.
 
-    __PACKAGE__->add_columns(qw/albumID artist title label year/);
+  __PACKAGE__->add_columns(qw/albumid artist title label year/);
 
 This will automatically create accessors for each of the columns, so
 that you can read/update the values in rows you've retrieved.
 
 Also, you need to tell it which column is the primary key:
 
-    __PACKAGE__->set_primary_key('albumID');
+  __PACKAGE__->set_primary_key('albumid');
 
-If you have multiple primary keys, just pass a list instead.
+If you have a primary key composed of multiple columns, just pass a
+list instead.
 
-That's pretty much all you need for a basic setup. If you have more
+That's pretty much all you need for a basic setup.  If you have more
 advanced needs like using more than one database connection for the
 same class, see L<DBIx::Class::Schema>.
 
@@ -74,52 +79,52 @@ same class, see L<DBIx::Class::Schema>.
 
 This is an additional class, and not part of the L<DBIx::Class>
 distribution.  Like L<Class::DBI::Loader>, it inspects your database,
-and automatically creates classes for all the tables in your
-database. Here's a simple setup:
+and automatically creates classes for all the tables in your database.
+Here's a simple setup:
 
-    package MyApp::DB;
-    use DBIx::Class::Loader;
+  package MyApp::DB;
+  use DBIx::Class::Loader;
 
-    my $loader = DBIx::Class::Loader->new(
-        dsn       => 'dbi:SQLite:/home/me/myapp/my.db',
-        namespace => 'MyApp::DB'
-    );
+  my $loader = DBIx::Class::Loader->new(
+    dsn       => 'dbi:SQLite:/home/me/myapp/my.db',
+    namespace => 'MyApp::DB'
+  );
 
-    1;
+  1;
 
-This should be equivalent to the manual in the section above.
-L<DBIx::Class::Loader> takes lots of other options. For more
+This should be equivalent to the manual setup in the section above.
+L<DBIx::Class::Loader> takes lots of other options.  For more
 information, consult its documentation.
 
 =head2 Basic usage
 
-Once you've defined the basic classes, you can start interacting with
-your database. The simplest way to get a column is by primary key:
+Once you've defined the basic classes, either manually or using
+L<DBIx::Class::Loader>, you can start interacting with your database.
+The simplest way to get a record is by primary key:
 
-    my $albumID = 14;
-    my $album   = MyApp::DB::Album->find($albumID);
+  my $album = MyApp::DB::Album->find(14);
 
-This will run a select with C<albumID = 14> in the C<WHERE> clause,
-and return an instance of C<MyApp::DB::Artist> that represents this
-row. Once you have that row, you can access and update columns:
+This will run a C<SELECT> with C<albumid = 14> in the C<WHERE> clause,
+and return an instance of C<MyApp::DB::Album> that represents this
+row.  Once you have that row, you can access and update columns:
 
-    $album->title('Physical Graffiti');
-    my $title = $album->title; # $title holds 'Physical Graffiti'
+  $album->title('Physical Graffiti');
+  my $title = $album->title; # $title holds 'Physical Graffiti'
 
 If you prefer, you can use the C<set_column> and C<get_column>
 accessors instead:
 
-    $album->set_column('title', 'Presence');
-    $title = $album->get_column('title');
+  $album->set_column('title', 'Presence');
+  $title = $album->get_column('title');
 
 Just like with L<Class::DBI>, you do an C<update> to commit your
 changes to the database:
 
-    $album->update;
+  $album->update;
 
-If needed, you can drop your local changes instead like this:
+If needed, you can throw away your local changes like this:
 
-    $album->discard_changes if $album->is_changed;
+  $album->discard_changes if $album->is_changed;
 
 As you can see, C<is_changed> allows you to check if there are local
 changes to your object.
@@ -127,73 +132,104 @@ changes to your object.
 =head2 Adding and removing rows
 
 To create a new record in the database, you can use the C<create>
-method from L<DBIx::Class::Row>. It returns a
-L<DBIx::Class::ResultSet> object that can be used to access the data
-in the new record.
+method.  It returns an instance of C<MyApp::DB::Album> that can be
+used to access the data in the new record:
 
-    my $new_album = MyApp::DB::Album->create({ 
-        title  => 'Wish You Were Here',
-        artist => 'Pink Floyd'
-    });
+  my $new_album = MyApp::DB::Album->create({ 
+    title  => 'Wish You Were Here',
+    artist => 'Pink Floyd'
+  });
 
 Now you can add data to the new record:
 
-    $new_album->label('Capitol');
-    $new_album->year('1975');
+  $new_album->label('Capitol');
+  $new_album->year('1975');
+  $new_album->update;
 
-Likewise, you can remove if from the database like this:
+Likewise, you can remove it from the database like this:
 
-    $new_album->delete;
+  $new_album->delete;
 
-or even without retrieving first. This operation takes the same kind
-of arguments as a search.
+You can also remove records without or retrieving first.  This
+operation takes the same kind of arguments as a search.
 
-    MyApp::DB::Album->delete({ artist => 'Falco' });
+  # Delete all of Falco's albums
+  MyApp::DB::Album->delete({ artist => 'Falco' });
 
 =head2 Finding your objects
 
 L<DBIx::Class> provides a few different ways to retrieve data from
-your database.  The simplest looks something like this:
+your database.  Here's one example:
+
+  # Find all of Santana's albums
+  my $rs = MyApp::DB::Album->search({ artist => 'Santana' });
+
+In scalar context, as above, C<search> returns a
+L<DBIx::Class::ResultSet> object.  It can be used to peek at the first
+album returned by the database:
+
+  my $album = $rs->first;
+  print $album->title;
 
-    my $iter = MyApp::DB::Album->search( artist => 'Santana' );
+Or, you can loop over the albums and update each one:
 
-Note that all the C<search> methods return a L<DBIx::Class::ResultSet>
-object in scalar context. So, if you want the first album:
+  while (my $album = $rs->next) {
+    print $album->artist . ' - ' . $album->title;
+    $album->year(2001);
+    $album->update;
+  }
 
-    my $album = $iter->first;
+For more information on what you can do with a
+L<DBIx::Class::ResultSet>, see L<DBIx::Class::ResultSet/METHODS>.
 
-In list context, the C<search> methods return all of the matching
+In list context, the C<search> method returns all of the matching
 rows:
 
-    my @albums = MyApp::DB::Album->search( artist => 'Santana' );
+  # Fetch immediately all of Carlos Santana's albums
+  my @albums = MyApp::DB::Album->search({ artist => 'Carlos Santana' });
+  foreach my $album (@albums) {
+    print $album->artist . ' - ' . $album->title;
+  }
 
 We also provide a handy shortcut for doing a C<LIKE> search:
 
-    my $iter = MyApp::DB::Album->search_like( artist => 'Jimi%' );
+  # Find albums whose artist starts with 'Jimi'
+  my $rs = MyApp::DB::Album->search_like({ artist => 'Jimi%' });
 
 Or you can provide your own handmade C<WHERE> clause, like:
-  
-    my $iter = MyApp::DB::Album->search_literal( 'artist = ?', 'Peter Frampton' );
+
+  # Find Peter Frampton albums from the year 1986
+  my $where = 'artist = ? AND year = ?';
+  my @bind  = ( 'Peter Frampton', 1986 );
+  my $rs    = MyApp::DB::Album->search_literal( $where, @bind );
 
 The preferred way to generate complex queries is to provide a
 L<SQL::Abstract> construct to C<search>:
 
-    my $iter = MyApp::DB::Album->search({
-        artist => { '!=', 'Janis Joplin' },
-        year   => { '<' => 1980 },
-        id     => [ 1, 14, 15, 65, 43 ]
-    });
+  my $rs = MyApp::DB::Album->search({
+    artist  => { '!=', 'Janis Joplin' },
+    year    => { '<' => 1980 },
+    albumid => [ 1, 14, 15, 65, 43 ]
+  });
+
+This results in something like the following C<WHERE> clause:
 
-For more examples of complex searches, see
+  WHERE artist != 'Janis Joplin'
+    AND year < 1980
+    AND albumid IN (1, 14, 15, 65, 43)
+
+For more examples of complex queries, see
 L<DBIx::Class::Manual::Cookbook>.
 
 The search can also be modified by passing another hash with
 attributes:
 
-    my $iter = MyApp::DB::Album->search( 
-        { artist => 'Bob Marley' },
-        { page => 1, rows => 2, order_by => 'year' }
-    );
+  my @albums = MyApp::DB::Album->search(
+    { artist => 'Bob Marley' },
+    { rows => 2, order_by => 'year DESC' }
+  );
+
+C<@albums> then holds the two most recent Bob Marley albums.
 
 For a complete overview of the available attributes, see
 L<DBIx::Class::ResultSet/ATTRIBUTES>.