Dokumentation

diff --git a/SL/Controller/Base.pm b/SL/Controller/Base.pm
index 112a7bd..c655e72 100644 (file)
--- a/SL/Controller/Base.pm
+++ b/SL/Controller/Base.pm
@@ -5,10 +5,11 @@ use parent qw(Rose::Object);
 use List::Util qw(first);
 
 sub parse_html_template {
-  my $self = shift;
-  my $name = shift;
+  my $self   = shift;
+  my $name   = shift;
+  my $locals = shift || {};
 
-  return $::form->parse_html_template($name, { @_, SELF => $self });
+  return $::form->parse_html_template($name, { %{ $locals }, SELF => $self });
 }
 
 sub url_for {
@@ -49,3 +50,158 @@ sub _dispatch {
 }
 
 1;
+
+__END__
+
+=head1 NAME
+
+SL::Controller::Base - base class for all action controllers
+
+=head1 SYNOPSIS
+
+=head2 OVERVIEW
+
+This is a base class for all action controllers. Action controllers
+provide subs that are callable by special URLs.
+
+For each request made to the web server an instance of the controller
+will be created. After the request has been served that instance will
+handed over to garbage collection.
+
+This base class is derived from L<Rose::Object>.
+
+=head2 CONVENTIONS
+
+The URLs have the following properties:
+
+=over 2
+
+=item *
+
+The script part of the URL must be C<controller.pl>.
+
+=item *
+
+There must be a GET or POST parameter named C<action> containing the
+name of the controller and the sub to call separated by C</>,
+e.g. C<Message/list>.
+
+=item *
+
+The controller name is the package's name without the
+C<SL::Controller::> prefix. At the moment only packages in the
+C<SL::Controller> namespace are valid; sub-namespaces are not
+allowed. The package name must start with an upper-case letter.
+
+=item *
+
+The sub part of the C<action> parameter is the name of the sub to
+call. However, the sub's name is automatically prefixed with
+C<action_>. Therefore for the example C<Message/list> the sub
+C<SL::DB::Message::action_list> would be called. This in turn means
+that subs whose name does not start with C<action_> cannot be invoked
+directly via the URL.
+
+=back
+
+=head2 INDIRECT DISPATCHING
+
+In the case that there are several submit buttons on a page it is
+often impractical to have a single C<action> parameter match up
+properly. For such a case a special dispatcher method is available. In
+that case the C<action> parameter of the URL must be
+C<Controller/dispatch>.
+
+The C<SL::Controller::Base::_dispatch> method will iterate over all
+subs in the controller package whose names start with C<action_>. The
+first one for which there's a GET or POST parameter with the same name
+and that's trueish is called.
+
+Usage from a template usually looks like this:
+
+  <form method="POST" action="controller.pl">
+    ...
+    <input type="hidden" name="action" value="Message/dispatch">
+    <input type="submit" name="action_mark_as_read" value="Mark messages as read">
+    <input type="submit" name="action_delete" value="Delete messages">
+  </form>
+
+The dispatching is handled by the function L</_dispatch>.
+
+=head1 FUNCTIONS
+
+=head2 PUBLIC HELPER FUNCTIONS
+
+These functions are supposed to be called by sub-classed controllers.
+
+=over 4
+
+=item C<parse_html_template $file_name, $local_variables>
+
+Outputs an HTML template. It is a thin wrapper around
+C<Form::parse_html_template> which also adds the current object as the
+template variable C<SELF>.
+
+=item C<url_for $url>
+
+=item C<url_for $params>
+
+=item C<url_for %params>
+
+Creates an URL for the given parameters suitable for calling an action
+controller. If there's only one scalar parameter then it is returned
+verbatim.
+
+Otherwise the parameters are given either as a single hash ref
+parameter or as a normal hash.
+
+The controller to call is given by C<$params{controller}>. It defaults
+to the current controller as returned by
+L</_controller_name>.
+
+The action to call is given by C<$params{action}>. It defaults to
+C<dispatch>.
+
+All other key/value pairs in C<%params> are appended as GET parameters
+to the URL.
+
+Usage from a template might look like this:
+
+  <a href="[% SELF.url_for(controller => 'Message', action => 'new', recipient_id => 42) %]">create new message</a>
+
+=back
+
+=head2 PRIVATE FUNCTIONS
+
+These functions are supposed to be used from this base class only.
+
+=over 4
+
+=item C<_controller_name>
+
+Returns the name of the curernt controller package without the
+C<SL::Controller::> prefix.
+
+=item C<_dispatch>
+
+Implements the method lookup for indirect dispatching mentioned in the
+section L</INDIRECT DISPATCHING>.
+
+=item C<_run_action $action>
+
+Executes a sub based on the value of C<$action>. C<$action> is the sub
+name part of the C<action> GET or POST parameter as described in
+L</CONVENTIONS>.
+
+If C<$action> equals C<dispatch> then the sub L</_dispatch> in this
+base class is called for L</INDIRECT DISPATCHING>. Otherwise
+C<$action> is prefixed with C<action_>, and that sub is called on the
+current controller instance.
+
+=back
+
+=head1 AUTHOR
+
+Moritz Bunkus E<lt>m.bunkus@linet-services.deE<gt>
+
+=cut