1 package SL::Controller::Helper::GetModels::Paginated;
4 use parent 'SL::Controller::Helper::GetModels::Base';
6 use List::Util qw(min);
8 use Rose::Object::MakeMethods::Generic (
9 scalar => [ qw(per_page form_data paginated_args calculated_params) ],
10 'scalar --get_set_init' => [ qw(form_params paginate_args) ],
14 my ($self, %specs) = @_;
16 $self->set_get_models(delete $specs{get_models});
17 $self->SUPER::init(%specs);
19 $self->per_page($self->get_models->manager->default_objects_per_page) unless $self->per_page;
21 $self->get_models->register_handlers(
22 callback => sub { shift; $self->_callback_handler_for_paginated(@_) },
25 # $::lxdebug->dump(0, "CONSPEC", \%specs);
29 my ($self, %params) = @_;
31 return %{ $self->form_data } if $self->form_data;
32 my $source = $self->get_models->source;
35 page => $source->{ $self->form_params->[0] } || 1,
36 per_page => $source->{ $self->form_params->[1] } * 1,
39 # my $priv = _priv($self);
40 $params{page} = $from_form->{page} unless defined $params{page};
41 $params{per_page} = $from_form->{per_page} unless defined $params{per_page};
43 $params{page} = ($params{page} * 1) || 1;
44 $params{per_page} = ($params{per_page} * 1) || $self->per_page;
46 $self->form_data(\%params);
52 my ($self, %args) = @_;
54 if ($self->is_enabled) {
55 my %paginate_params = $self->read_params;
57 # try to use Filtered if available and nothing else is configured, but don't
58 # blow up if the controller does not use Filtered
59 my %paginate_args = ref($self->paginate_args) eq 'CODE' ? %{ $self->paginate_args->($self) }
60 : $self->paginate_args eq '__FILTER__'
61 && $self->get_models->filtered ? $self->get_models->filtered->read_params
62 : $self->paginate_args ne '__FILTER__' ? do { my $sub = $self->paginate_args; %{ $self->get_models->controller->$sub() } }
65 %args = $self->merge_args(\%args, \%paginate_args);
67 my $calculated_params = $self->get_models->manager->paginate(%paginate_params, args => \%args);
69 $self->calculated_params($calculated_params);
72 $self->paginated_args(\%args);
77 sub get_current_paginate_params {
78 my ($self, %args) = @_;
79 return () unless $self->is_enabled;
80 %{ $self->calculated_params };
87 sub _callback_handler_for_paginated {
88 my ($self, %params) = @_;
89 my %form_params = $self->read_params;
91 if ($self->is_enabled && $form_params{page}) {
92 $params{ $self->form_params->[0] } = $form_params{page};
93 $params{ $self->form_params->[1] } = $form_params{per_page} if $form_params{per_page};
96 # $::lxdebug->dump(0, "CB handler for paginated; params nach modif:", \%params);
101 sub init_form_params {
102 [ qw(page per_page) ]
105 sub init_paginate_args {
118 SL::Controller::Helper::Paginated - A helper for semi-automatic handling
119 of paginating lists of database models in a controller
125 use SL::Controller::Helper::GetModels;
126 use SL::Controller::Helper::Paginated;
128 __PACKAGE__->make_paginated(
129 MODEL => 'BackgroundJobHistory',
130 ONLY => [ qw(list) ],
131 FORM_PARAMS => [ qw(page per_page) ],
137 my $paginated_models = $self->get_models;
138 $self->render('controller/list', ENTRIES => $paginated_models);
153 [% FOREACH entry = ENTRIES %]
161 [% L.paginate_controls %]
165 This specialized helper module enables controllers to display a
166 paginatable list of database models with as few lines as possible. It
167 can also be combined trivially with the L<SL::Controller::Sorted>
168 helper for sortable lists.
170 For this to work the controller has to provide the information which
171 indexes are eligible for paginateing etc. by a call to
172 L<make_paginated> at compile time.
174 The underlying functionality that enables the use of more than just
175 the paginate helper is provided by the controller helper
176 C<GetModels>. See the documentation for L<SL::Controller::Sorted> for
177 more information on it.
179 A template can use the method C<paginate_controls> from the layout
180 helper module C<L> which renders the links for navigation between the
183 This module requires that the Rose model managers use their C<Paginated>
186 The C<Paginated> helper hooks into the controller call to the action via
187 a C<run_before> hook. This is done so that it can remember the paginate
188 parameters that were used in the current view.
190 =head1 PACKAGE FUNCTIONS
194 =item C<make_paginated %paginate_spec>
196 This function must be called by a controller at compile time. It is
197 uesd to set the various parameters required for this helper to do its
200 The hash C<%paginate_spec> can include the following parameters:
206 Optional. A string: the name of the Rose database model that is used
207 as a default in certain cases. If this parameter is missing then it is
208 derived from the controller's package (e.g. for the controller
209 C<SL::Controller::BackgroundJobHistory> the C<MODEL> would default to
210 C<BackgroundJobHistory>).
212 =item * C<PAGINATE_ARGS>
214 Optional. Either a code reference or the name of function to be called
215 on the controller importing this helper.
217 If this funciton is given then the paginate helper calls it whenever
218 it has to count the total number of models for calculating the number
219 of pages to display. The function must return a hash reference with
220 elements suitable for passing to a Rose model manager's C<get_all>
223 This can be used e.g. when filtering is used.
227 Optional. An integer: the number of models to return per page.
229 Defaults to the underlying database model's default number of models
232 =item * C<FORM_PARAMS>
234 Optional. An array reference with exactly two strings that name the
235 indexes in C<$::form> in which the current page's number (the first
236 element in the array) and the number of models per page (the second
237 element in the array) are stored.
239 Defaults to the values C<page> and C<per_page> if missing.
243 Optional. An array reference containing a list of action names for
244 which the paginate parameters should be saved. If missing or empty then
245 all actions invoked on the controller are monitored.
251 =head1 INSTANCE FUNCTIONS
253 These functions are called on a controller instance.
257 =item C<get_paginate_spec>
259 Returns a hash containing the currently active paginate
260 parameters. The following keys are returned:
266 The currently active page number (numbering starts at 1).
270 Number of models per page (at least 1).
274 Number of pages to display (at least 1).
276 =item * C<common_pages>
278 An array reference with one hash reference for each possible
279 page. Each hash ref contains the keys C<active> (C<1> if that page is
280 the currently active page), C<page> (the page number this hash
281 reference describes) and C<visible> (whether or not it should be
286 =item C<get_current_paginate_params>
288 Returns a hash reference to the paginate spec structure given in the call
289 to L<make_paginated> after normalization (hash reference construction,
290 applying default parameters etc).
292 =item C<disable_pagination>
294 Disable pagination for the duration of the current action. Can be used
295 when using the attribute C<ONLY> to L<make_paginated> does not
306 Moritz Bunkus E<lt>m.bunkus@linet-services.deE<gt>