links will be used instead of full HTML buttons).
Also notice that we are using a more advanced form of C<uri_for> than
-we have seen before. Here we use C<$c-E<gt>controller-
-E<gt>action_for> to automatically generate a URI appropriate for that
-action based on the method we want to link to while inserting the
-C<book.id> value into the appropriate place. Now, if you ever change
-C<:PathPart('delete')> in your controller method to
+we have seen before. Here we use
+C<$c-E<gt>controller-E<gt>action_for> to automatically generate a URI
+appropriate for that action based on the method we want to link to
+while inserting the C<book.id> value into the appropriate place. Now,
+if you ever change C<:PathPart('delete')> in your controller method to
C<:PathPart('kill')>, then your links will automatically update
without any changes to your .tt2 template file. As long as the name
of your method does not changed ("delete" here), then your links will
-still be correct. There are a few shortcuts and options when using
+still be correct. There are a few shortcuts and options when using
C<action_for()>:
=over 4
Now, any other method that chains off C<object> will automatically
have the appropriate book waiting for it in
-C<$c-E<gt>stash-Egt>{object}>.
+C<$c-E<gt>stash-E<gt>{object}>.
Also note that we are using different technique for setting
C<$c-E<gt>stash>. The advantage of this style is that it let's you
along with a list of the eight remaining books. You will also see the
cascading delete operation via the DBIC_TRACE output:
+ SELECT me.id, me.title, me.rating FROM books me WHERE ( ( me.id = ? ) ): '6'
DELETE FROM books WHERE ( id = ? ): '6'
SELECT me.book_id, me.author_id FROM book_authors me WHERE ( me.book_id = ? ): '6'
DELETE FROM book_authors WHERE ( author_id = ? AND book_id = ? ): '4', '6'
Note the URL in your browser once you have performed the deletion in the
prior step -- it is still referencing the delete action:
- http://localhost:3000/books/delete/6
+ http://localhost:3000/books/id/6/delete
What if the user were to press reload with this URL still active? In
this case the redundant delete is harmless (although it does generate
features below, let's first migrate our configuration over to use
C<load_namespaces>.
-If you are following along in Ubuntu 8.10, you will need to
-upgrade your version of
-L<Catalyst::Model::DBIC::Schema|Catalyst::Model::DBIC::Schema>
-to 0.23 or higher. To do this, we can install directly from CPAN:
+If you are following along in Debian 5, you will need to upgrade your
+version of
+L<Catalyst::Model::DBIC::Schema|Catalyst::Model::DBIC::Schema> to 0.23
+or higher. To do this, we can install directly from CPAN via the
+following command:
- $ cpan Catalyst::Model::DBIC::Schema
+ $ sudo cpan Catalyst::Model::DBIC::Schema
Then make sure you are running an appropriate version:
Make sure you get version 0.23 or higher.
-B<Note:> Ubuntu will automatically "do the right thing" and use the
+B<Note:> Debian will automatically "do the right thing" and use the
module we installed from CPAN and ignore the older version we picked
-up via the C<apt-get> command. If you are using a different
+up via the C<aptitude> command. If you are using a different
environment, you will need to make sure you are using v0.23 or higher
with the command above.
sqlite> ALTER TABLE books ADD updated INTEGER;
sqlite> UPDATE books SET created = DATETIME('NOW'), updated = DATETIME('NOW');
sqlite> SELECT * FROM books;
- 1|CCSP SNRS Exam Certification Guide|5|2009-03-03 07:31:32|2009-03-03 07:31:32
- 2|TCP/IP Illustrated, Volume 1|5|2009-03-03 07:31:32|2009-03-03 07:31:32
- ...
+ 1|CCSP SNRS Exam Certification Guide|5|2009-03-08 16:26:35|2009-03-08 16:26:35
+ 2|TCP/IP Illustrated, Volume 1|5|2009-03-08 16:26:35|2009-03-08 16:26:35
+ 3|Internetworking with TCP/IP Vol.1|4|2009-03-08 16:26:35|2009-03-08 16:26:35
+ 4|Perl Cookbook|5|2009-03-08 16:26:35|2009-03-08 16:26:35
+ 5|Designing with Web Standards|5|2009-03-08 16:26:35|2009-03-08 16:26:35
+ 9|TCP/IP Illustrated, Vol 3|5|2009-03-08 16:26:35|2009-03-08 16:26:35
sqlite> .quit
$
This will modify the C<books> table to include the two new fields
and populate those fields with the current time.
+
=head2 Update DBIC to Automatically Handle the Datetime Columns
Next, we should re-run the DBIC helper to update the Result Classes
time entered for it (see the last line in the listing below):
sqlite3 myapp.db "select * from books"
- 1|CCSP SNRS Exam Certification Guide|5|2009-03-05 17:18:53|2009-03-05 17:18:53
- 2|TCP/IP Illustrated, Volume 1|5|2009-03-05 17:18:53|2009-03-05 17:18:53
- 3|Internetworking with TCP/IP Vol.1|4|2009-03-05 17:18:53|2009-03-05 17:18:53
- 4|Perl Cookbook|5|2009-03-05 17:18:53|2009-03-05 17:18:53
- 5|Designing with Web Standards|5|2009-03-05 17:18:53|2009-03-05 17:18:53
- 9|TCP/IP Illustrated, Vol 3|5|2009-03-05 17:18:53|2009-03-05 17:18:53
- 10|TCPIP_Illustrated_Vol-2|5|2009-03-05 17:24:18|2009-03-05 17:24:18
+ 1|CCSP SNRS Exam Certification Guide|5|2009-03-08 16:26:35|2009-03-08 16:26:35
+ 2|TCP/IP Illustrated, Volume 1|5|2009-03-08 16:26:35|2009-03-08 16:26:35
+ 3|Internetworking with TCP/IP Vol.1|4|2009-03-08 16:26:35|2009-03-08 16:26:35
+ 4|Perl Cookbook|5|2009-03-08 16:26:35|2009-03-08 16:26:35
+ 5|Designing with Web Standards|5|2009-03-08 16:26:35|2009-03-08 16:26:35
+ 9|TCP/IP Illustrated, Vol 3|5|2009-03-08 16:26:35|2009-03-08 16:26:35
+ 10|TCPIP_Illustrated_Vol-2|5|2009-03-08 16:29:08|2009-03-08 16:29:08
Notice in the debug log that the SQL DBIC generated has changed to
incorporate the datetime logic:
INSERT INTO books (created, rating, title, updated) VALUES (?, ?, ?, ?):
- '2009-03-05 17:24:18', '5', 'TCPIP_Illustrated_Vol-2', '2009-03-05 17:24:18'
+ '2009-03-08 16:29:08', '5', 'TCPIP_Illustrated_Vol-2', '2009-03-08 16:29:08'
INSERT INTO book_authors (author_id, book_id) VALUES (?, ?): '4', '10'
the title. Open up C<lib/MyApp/Controller/Books.pm> and add the
following method:
- =head2 list_recent
+ =head2 list_recent_tcp
List recently created books
the first URL and you should see something similar to the following:
SELECT me.id, me.title, me.rating, me.created, me.updated FROM books me
- WHERE ( ( ( title LIKE ? ) AND ( created > ? ) ) ): '%TCP%', '2009-03-05 15:52:57'
+ WHERE ( ( ( title LIKE ? ) AND ( created > ? ) ) ): '%TCP%', '2009-03-08 14:52:54'
However, let's not pollute our controller code with this raw "TCP"
query -- it would be cleaner to encapsulate that code in a method on
name for an author in one shot. Now open C<root/src/books/list.tt2>
and change the definition of C<tt_authors> from this:
+ ...
[% tt_authors = [ ];
tt_authors.push(author.last_name) FOREACH author = book.authors %]
+ ...
to:
+ ...
[% tt_authors = [ ];
tt_authors.push(author.full_name) FOREACH author = book.authors %]
+ ...
(Only C<author.last_name> was changed to C<author.full_name> -- the
rest of the file should remain the same.)
projects / catagits/Catalyst-Manual.git / blobdiff