This part of the tutorial builds on the fairly primitive application
created in Part 2 to add basic support for Create, Read, Update, and
Delete (CRUD) of C<Book> objects. Note that the 'list' function in Part
-2 already implements the Read portion of Crud (although Read normally
+2 already implements the Read portion of CRUD (although Read normally
refers to reading a single object; you could implement full read
functionality using the techniques introduced below). This section will
focus on the Create and Delete aspects of CRUD. More advanced
IMPORTANT: Does not work yet. Will be completed for final version.
-
=head1 FORMLESS SUBMISSION
Our initial attempt at object creation will utilize the "URL arguments"
=head2 url_create
- Create a book with the supplied title, rating and author
+ Create a book with the supplied title, rating, and author
=cut
sub url_create : Local {
- # In addition to self & context, get the title, rating & author_id args
- # from the URL. Note that Catalyst automatically puts extra information
- # after the "/<controller_name>/<action_name/" into @_
+ # In addition to self & context, get the title, rating, &
+ # author_id args from the URL. Note that Catalyst automatically
+ # puts extra information after the "/<controller_name>/<action_name/"
+ # into @_
+
my ($self, $c, $title, $rating, $author_id) = @_;
# Call create() on the book model object. Pass the table
[% # 'uri_for()' builds a full URI; e.g., 'http://localhost:3000/books/list' -%]
<p><a href="[% Catalyst.uri_for('/books/list') %]">Return to list</a></p>
- [% # Try out the TT Dumper -%]
+ [% # Try out the TT Dumper (for development only!) -%]
<pre>
Dump of the 'book' variable:
[% Dumper.dump(book) %]
</pre>
-The TT C<USE> directive allows access to a variety of plugin modules (we
-are talking TT plugins here, not Catalyst plugins) to add extra
-functionality to the base TT capabilities. Here, the plugin allows
-L<Data::Dumper|Data::Dumper> "pretty printing" of objects and variables.
-Other than that, the rest of the code should be familiar from the
-examples in Part 2.
+The TT C<USE> directive allows access to a variety of plugin modules (TT
+plugins, that is, not Catalyst plugins) to add extra functionality to
+the base TT capabilities. Here, the plugin allows L<Data::Dumper>
+"pretty printing" of objects and variables. Other than that, the rest
+of the code should be familiar from the examples in Part 2.
B<IMPORTANT NOTE> As mentioned earlier, the C<MyApp::View::TT.pm> view
class created by TTSite redefines the name used to access the Catalyst
context object in TT templates from the usual C<c> to C<Catalyst>.
-
=head2 Try the C<url_create> Feature
If the application is still running from before, use C<Ctrl-C> to kill
-it. Then restart the server:
+it. Then restart the server:
$ script/myapp_server.pl
B<TIP>: You can use C<script/myapp_server.pl -r> to have the development
server auto-detect changed files and reload itself (if your browser acts
odd, you should also try throwing in a C<-k>). If you make changes to
-just the TT templates, you do not need to reload the development server
+the TT templates only, you do not need to reload the development server
(only changes to "compiled code" such as Controller and Model C<.pm>
files require a reload).
C</books/list> page).
-
=head1 MANUALLY BUILDING A CREATE FORM
Although the C<url_create> action in the previous step does begin to
$c->stash->{template} = 'books/form_create.tt2';
}
-This action merely invokes a view containing a book creation form.
-
+This action simply invokes a view containing a book creation form.
=head2 Add a Template for the Form
Note that we have specified the target of the form data as
C<form_create_do>, the method created in the section that follows.
-
=head2 Add Method to Process Form Values and Update Database
Edit C<lib/MyApp/Controller/Books.pm> and add the following method to
# Store new model object in stash
$c->stash->{book} = $book;
- # Avoid Data::Dumper issue mention earlier
+ # Avoid Data::Dumper issue mentioned earlier
# You can probably omit this
$Data::Dumper::Useperl = 1;
=head2 Test Out The Form
-If the application is still running from before, use C<Ctrl-C> to kill it. Then restart the server:
+If the application is still running from before, use C<Ctrl-C> to kill
+it. Then restart the server:
$ script/myapp_server.pl
"Return to list" to view the full list of books.
B<Note:> Having the user enter the primary key ID for the author is
-obviously a bit crude; we will address this concern with a drop-down
-list in Part 8.
-
-
+obviously crude; we will address this concern with a drop-down list in
+Part 8.
=head1 A SIMPLE DELETE FEATURE
right side of the table with a C<Delete> "button" (for simplicity, links
will be used instead of full HTML buttons).
-
=head2 Add a Delete Action to the Controller
Open C<lib/MyApp/Controller/Books.pm> in your editor and add the
deleted" status message should display at the top of the page, along
with a list of the six remaining books.
-
=head1 AUTHOR
Kennedy Clark, C<hkclark@gmail.com>
projects / catagits/Catalyst-Runtime.git / blobdiff