oracular (3) HTML::FormFu::Model::DBIC.3pm.gz
NAME
HTML::FormFu::Model::DBIC - Integrate HTML::FormFu with DBIx::Class
VERSION
version 2.03
SYNOPSIS
Example of typical use in a Catalyst controller:
sub edit : Chained {
my ( $self, $c ) = @_;
my $form = $c->stash->{form};
my $book = $c->stash->{book};
if ( $form->submitted_and_valid ) {
# update dbic row with submitted values from form
$form->model->update( $book );
$c->response->redirect( $c->uri_for('view', $book->id) );
return;
}
elsif ( !$form->submitted ) {
# use dbic row to set form's default values
$form->model->default_values( $book );
}
return;
}
SETUP
For the form object to be able to access your DBIx::Class schema, it needs to be placed on the form
stash, with the name "schema".
This is easy if you're using Catalyst-Controller-HTML-FormFu, as you can set this up to happen in your
Catalyst app's config file.
For example, if your model is named "MyApp::Model::Corp", you would set this (in Config::General format):
<Controller::HTML::FormFu>
<model_stash>
schema Corp
</model_stash>
</Controller::HTML::FormFu>
Or if your app's config file is in YAML format:
'Controller::HTML::FormFu':
model_stash:
schema: Corp
METHODS
default_values
Arguments: $dbic_row, [\%config]
Return Value: $form
$form->model->default_values( $dbic_row );
Set a form's default values from the database, to allow a user to edit them.
update
Arguments: [$dbic_row], [\%config]
Return Value: $dbic_row
$form->model->update( $dbic_row );
Update the database with the submitted form values.
create
Arguments: [\%config]
Return Value: $dbic_row
my $dbic_row = $form->model->create( {resultset => 'Book'} );
Like "update", but doesn't require a $dbic_row argument.
You need to ensure the DBIC schema is available on the form stash - see "SYNOPSIS" for an example config.
The "resultset" must be set either in the method arguments, or the form or block's "model_config".
An example of setting the ResultSet name on a Form:
---
model_config:
resultset: FooTable
elements:
# [snip]
options_from_model
Populates a multi-valued field with values from the database.
This method should not be called directly, but is called for you during "$form->process" by fields that
inherit from HTML::FormFu::Element::_Group. This includes:
HTML::FormFu::Element::Select
HTML::FormFu::Element::Checkboxgroup
HTML::FormFu::Element::Radiogroup
HTML::FormFu::Element::ComboBox
To use you must set the appropriate "resultset" on the element "model_config":
element:
- type: Select
name: foo
model_config:
resultset: TableClass
BUILDING FORMS
single table
To edit the values in a row with no related rows, the field names simply have to correspond to the
database column names.
For the following DBIx::Class schema:
package MySchema::Book;
use base 'DBIx::Class';
__PACKAGE__->load_components(qw/ Core /);
__PACKAGE__->table("book");
__PACKAGE__->add_columns(
id => { data_type => "INTEGER" },
title => { data_type => "TEXT" },
author => { data_type => "TEXT" },
blurb => { data_type => "TEXT" },
);
__PACKAGE__->set_primary_key("id");
1;
A suitable form for this might be:
elements:
- type: Text
name: title
- type: Text
name: author
- type: Textarea
name: blurb
might_have and has_one relationships
Set field values from a related row with a "might_have" or "has_one" relationship by placing the fields
within a Block (or any element that inherits from Block, such as Fieldset) with its "nested_name" in
HTML::FormFu set to the relationship name.
For the following DBIx::Class schemas:
package MySchema::Book;
use base 'DBIx::Class';
__PACKAGE__->load_components(qw/ Core /);
__PACKAGE__->table("book");
__PACKAGE__->add_columns(
id => { data_type => "INTEGER" },
title => { data_type => "TEXT" },
);
__PACKAGE__->set_primary_key("id");
__PACKAGE__->might_have( review => 'MySchema::Review', 'book' );
1;
package MySchema::Review;
use base 'DBIx::Class';
__PACKAGE__->load_components(qw/ Core /);
__PACKAGE__->table("review");
__PACKAGE__->add_columns(
id => { data_type => "INTEGER" },
book => { data_type => "INTEGER", is_nullable => 1 },
review_text => { data_type => "TEXT" },
);
__PACKAGE__->set_primary_key("book");
__PACKAGE__->belongs_to( book => 'MySchema::Book' );
1;
A suitable form for this would be:
elements:
- type: Text
name: title
- type: Block
nested_name: review
elements:
- type: Textarea
name: review_text
For "might_have" and "has_one" relationships, you generally shouldn't need to have a field for the
related table's primary key, as DBIx::Class will handle retrieving the correct row automatically.
You can also set a "has_one" or "might_have" relationship using a multi value field like Select.
elements:
- type: Text
name: title
- type: Select
nested: review
model_config:
resultset: Review
This will load all reviews into the select field. If you select a review from that list, a current
relationship to a review is removed and the new one is added. This requires that the primary key of the
"Review" table and the foreign key do not match.
has_many and many_to_many relationships
The general principle is the same as for "might_have" and "has_one" above, except you should use a
Repeatable element instead of a Block, and it needs to contain a Hidden field corresponding to the
primary key of the related table.
The Repeatable block's nested_name must be set to the name of the relationship.
The Repeable block's increment_field_names must be true (which is the default value).
The Repeable block's counter_name must be set to the name of a Hidden field, which is placed outside of
the Repeatable block. This field is used to store a count of the number of repetitions of the Repeatable
block were created. When the form is submitted, this value is used during "$form->process" to ensure the
form is rebuilt with the correct number of repetitions.
To allow the user to add new related rows, either "empty_rows" or "new_rows_max" must be set - see
"Config options for Repeatable blocks" below.
For the following DBIx::Class schemas:
package MySchema::Book;
use base 'DBIx::Class';
__PACKAGE__->load_components(qw/ Core /);
__PACKAGE__->table("book");
__PACKAGE__->add_columns(
id => { data_type => "INTEGER" },
title => { data_type => "TEXT" },
);
__PACKAGE__->set_primary_key("id");
__PACKAGE__->has_many( review => 'MySchema::Review', 'book' );
1;
package MySchema::Review;
use base 'DBIx::Class';
__PACKAGE__->load_components(qw/ Core /);
__PACKAGE__->table("review");
__PACKAGE__->add_columns(
book => { data_type => "INTEGER" },
review_text => { data_type => "TEXT" },
);
__PACKAGE__->set_primary_key("book");
__PACKAGE__->belongs_to( book => 'MySchema::Book' );
1;
A suitable form for this might be:
elements:
- type: Text
name: title
- type: Hidden
name: review_count
- type: Repeatable
nested_name: review
counter_name: review_count
model_config:
empty_rows: 1
elements:
- type: Hidden
name: book
- type: Textarea
name: review_text
belongs_to relationships
Belongs-to relationships can be edited / created with a ComboBox element. If the user selects a value
with the Select field, the belongs-to will be set to an already-existing row in the related table. If
the user enters a value into the Text field, the belongs-to will be set using a newly-created row in the
related table.
elements:
- type: ComboBox
name: author
model_config:
resultset: Author
select_column: id
text_column: name
The element name should match the relationship name. "$field->model_config->{select_column}" should
match the related primary column. "$field->model_config->{text_column}" should match the related text
column.
many_to_many selection
To select / deselect rows from a "many_to_many" relationship, you must use a multi-valued element, such
as a Checkboxgroup or a Select with multiple set.
The field's name must be set to the name of the "many_to_many" relationship.
default_column
If you want to search / associate the related table by a column other it's primary key, set
"$field->model_config->{default_column}".
---
element:
- type: Checkboxgroup
name: authors
model_config:
default_column: foo
link_values
If you want to set columns on the link table you can do so if you add a "link_values" attribute to
"model_config":
---
element:
- type: Checkboxgroup
name: authors
model_config:
link_values:
foo: bar
additive
The default implementation will first remove all related objects and set the new ones (see
<http://search.cpan.org/perldoc?DBIx::Class::Relationship::Base#set_$rel>). If you want to add the
selected objects to the current set of objects set "additive" in the "model_config".
---
element:
- type: Checkboxgroup
name: authors
model_config:
additive: 1
options_from_model: 0
"options_from_model" is set to 0 because it will try to fetch all objects from the result class "Authors"
if "model_config" is specified without a "resultset" attribute.)
COMMON ARGUMENTS
The following items are supported in the optional "config" hash-ref argument to the methods
default_values, update and create.
base
If you want the method to process a particular Block element, rather than the whole form, you can
pass the element as a "base" argument.
$form->default_values(
$row,
{
base => $formfu_element,
},
);
nested_base
If you want the method to process a particular Block element by name, you can pass the name as an
argument.
$form->default_values(
$row,
{
nested_base => 'foo',
}'
);
CONFIGURATION
Config options for fields
The following items are supported as "model_config" options on form fields.
accessor
If set, "accessor" will be used as a method-name accessor on the "DBIx::Class" row object, instead of
using the field name.
ignore_if_empty
If the submitted value is blank, no attempt will be made to save it to the database.
null_if_empty
If the submitted value is blank, save it as NULL to the database. Normally an empty string is saved
as NULL when its corresponding field is numeric, and as an empty string when its corresponding field
is a text field. This option is useful for changing the default behavior for text fields.
delete_if_empty
Useful for editing a "might_have" related row containing only one field.
If the submitted value is blank, the related row is deleted.
For the following DBIx::Class schemas:
package MySchema::Book;
use base 'DBIx::Class';
__PACKAGE__->load_components(qw/ Core /);
__PACKAGE__->table("book");
__PACKAGE__->add_columns(
id => { data_type => "INTEGER" },
title => { data_type => "TEXT" },
);
__PACKAGE__->set_primary_key("id");
__PACKAGE__->might_have( review => 'MySchema::Review', 'book' );
1;
package MySchema::Review;
use base 'DBIx::Class';
__PACKAGE__->load_components(qw/ Core /);
__PACKAGE__->table("review");
__PACKAGE__->add_columns(
book => { data_type => "INTEGER" },
review_text => { data_type => "TEXT" },
);
__PACKAGE__->set_primary_key("book");
__PACKAGE__->belongs_to( book => 'MySchema::Book' );
1;
A suitable form for this would be:
elements:
- type: Text
name: title
- type: Block
nested_name: review
elements:
- type: Text
name: review_text
model_config:
delete_if_empty: 1
label
To use a column value for a form field's label.
Config options for fields within a Repeatable block
delete_if_true
Intended for use on a Checkbox field.
If the checkbox is checked, the following occurs: for a has-many relationship, the related row is
deleted; for a many-to-many relationship, the relationship link is removed.
An example of use might be:
elements:
- type: Text
name: title
- type: Hidden
name: review_count
- type: Repeatable
nested_name: review
counter_name: review_count
elements:
- type: Hidden
name: book
- type: Textarea
name: review_text
- type: Checkbox
name: delete_review
label: 'Delete Review?'
model_config:
delete_if_true: 1
Note: make sure the name of this field does not clash with one of your DBIx::Class::Row method names
(e.g. "delete") - see "CAVEATS".
Config options for Repeatable blocks
empty_rows
For a Repeatable block corresponding to a has-many or many-to-many relationship, to allow the user to
insert new rows, set "empty_rows" to the number of extra repetitions you wish added to the end of the
Repeatable block.
new_rows_max
Set to the maximum number of new rows that a Repeatable block is allowed to add.
If not set, it will fallback to the value of "empty_rows".
Config options for options_from_model
The column used for the element values is set with the "model_config" value "id_column" - or if not set,
the table's primary column is used.
element:
- type: Select
name: foo
model_config:
resultset: TableClass
id_column: pk_col
The column used for the element labels is set with the "model_config" value "label_column" - or if not
set, the first text/varchar column found in the table is used - or if one is not found, the "id_column"
is used instead.
element:
- type: Select
name: foo
model_config:
resultset: TableClass
label_column: label_col
To pass the database label values via the form's localization object, set "localize_label"
element:
- type: Select
name: foo
model_config:
localize_label: 1
You can set a "condition", which will be passed as the 1st argument to "search" in
DBIx::Class::ResultSet.
element:
- type: Select
name: foo
model_config:
resultset: TableClass
condition:
type: is_foo
You can set a "condition_from_stash", which will be passed as the 1st argument to "search" in
DBIx::Class::ResultSet.
"key" is the column-name to be passed to search, and "stash_key" is the name of a key on the form stash
from which the value to be passed to search is found.
element:
- type: Select
name: foo
model_config:
resultset: TableClass
condition_from_stash:
key: stash_key
Is comparable to:
$form->element({
type => 'Select',
name => 'foo',
model_config => {
resultset => 'TableClass',
condition => {
key => $form->stash->{stash_key}
}
}
})
If the value in the stash is nested in a data-structure, you can access it by setting
"expand_stash_dots". As you can see in the example below, it automatically handles calling methods on
objects, accessing hash-keys on hash-references, and accessing array-slots on array references.
element:
- type: Select
name: foo
model_config:
resultset: TableClass
condition_from_stash:
key: foo.bar.0
expand_stash_dots: 1
Is comparable to:
$form->element({
type => 'Select',
name => 'foo',
model_config => {
resultset => 'TableClass',
condition => {
key => $form->stash->{foo}->bar->[0];
}
}
})
# Where stash returns a hashref.
# The 'foo' hash-key returns an object.
# The object-method 'bar' returns an arrayref.
# The first array slot returns the value used in the query.
You can set "attributes", which will be passed as the 2nd argument to "search" in DBIx::Class::ResultSet.
ENUM Column Type
If the field name matches (case-insensitive) a column name with type 'ENUM' and the Schema contains enum
values in "$resultset->column_info($name)->{extra}{list}", the field's options will be populated with the
enum values.
FAQ
Add extra values not in the form
To update values to the database which weren't submitted to the form, you can first add them to the form
with add_valid.
my $passwd = generate_passwd();
$form->add_valid( passwd => $passwd );
$form->model->update( $row );
"add_valid" works for fieldnames that don't exist in the form.
Set a field read only
You can make a field read only. The value of such fields cannot be changed by the user even if they
submit a value for it.
$field->model_config->{read_only} = 1;
- Name: field
model_config:
read_only: 1
See HTML::FormFu::Element::Label.
CAVEATS
To ensure your column's inflators and deflators are called, we have to get / set values using their named
methods, and not with "get_column" / "set_column".
Because of this, beware of having column names which clash with DBIx::Class built-in method-names, such
as "delete". - It will have obviously undesirable results!
REMOVED METHODS
new_empty_row
See "empty_rows" in "Config options for Repeatable blocks" instead.
new_empty_row_multi
See "new_rows_max" in "Config options for Repeatable blocks" instead.
Range constraint
See "empty_rows" in "Config options for Repeatable blocks" instead.
SUPPORT
Project Page:
<http://code.google.com/p/html-formfu/>
Mailing list:
<http://lists.scsys.co.uk/cgi-bin/mailman/listinfo/html-formfu>
Mailing list archives:
<http://lists.scsys.co.uk/pipermail/html-formfu/>
BUGS
Please submit bug reports to the Debian Bug Tracker. You can use reportbug(1) to do so interactively. A list of reported bugs can be found at <http://bugs.debian.org/libhtml-formfu-perl>. For upstream bug reports / feature requests look at <http://code.google.com/p/html-formfu/issues/list> (preferred) or <http://rt.cpan.org/NoAuth/Bugs.html?Dist=HTML-FormFu>.
GITHUB REPOSITORY
This module's sourcecode is maintained in a git repository at
<git://github.com/fireartist/HTML-FormFu-Model-DBIC.git>
The project page is <https://github.com/fireartist/HTML-FormFu-Model-DBIC>
SEE ALSO
HTML::FormFu, DBIx::Class, Catalyst::Controller::HTML::FormFu
AUTHOR
Carl Franks
CONTRIBUTORS
Based on the code of "DBIx::Class::HTML::FormFu", which was contributed to by:
Adam Herzog
Daisuke Maki
Mario Minati
COPYRIGHT AND LICENSE
Copyright (C) 2007 by Carl Franks
Based on the original source code of DBIx::Class::HTMLWidget, copyright Thomas Klausner.
This library is free software; you can redistribute it and/or modify it under the same terms as Perl
itself, either Perl version 5.8.8 or, at your option, any later version of Perl 5 you may have available.