[Bast-commits] r7167 - in DBIx-Class/0.08/trunk/lib/DBIx: . Class
Class/ResultSource
castaway at dev.catalyst.perl.org
castaway at dev.catalyst.perl.org
Sun Aug 2 12:10:53 GMT 2009
Author: castaway
Date: 2009-08-02 12:10:53 +0000 (Sun, 02 Aug 2009)
New Revision: 7167
Modified:
DBIx-Class/0.08/trunk/lib/DBIx/Class.pm
DBIx-Class/0.08/trunk/lib/DBIx/Class/ResultSource.pm
DBIx-Class/0.08/trunk/lib/DBIx/Class/ResultSource/View.pm
Log:
Docs: Explainations of result sources and how to find them
Modified: DBIx-Class/0.08/trunk/lib/DBIx/Class/ResultSource/View.pm
===================================================================
--- DBIx-Class/0.08/trunk/lib/DBIx/Class/ResultSource/View.pm 2009-08-02 10:41:25 UTC (rev 7166)
+++ DBIx-Class/0.08/trunk/lib/DBIx/Class/ResultSource/View.pm 2009-08-02 12:10:53 UTC (rev 7167)
@@ -17,7 +17,7 @@
=head1 SYNOPSIS
- package MyDB::Schema::Year2000CDs;
+ package MyDB::Schema::Result::Year2000CDs;
use DBIx::Class::ResultSource::View;
Modified: DBIx-Class/0.08/trunk/lib/DBIx/Class/ResultSource.pm
===================================================================
--- DBIx-Class/0.08/trunk/lib/DBIx/Class/ResultSource.pm 2009-08-02 10:41:25 UTC (rev 7166)
+++ DBIx-Class/0.08/trunk/lib/DBIx/Class/ResultSource.pm 2009-08-02 12:10:53 UTC (rev 7167)
@@ -24,13 +24,76 @@
=head1 SYNOPSIS
+ # Create a table based result source, in a result class.
+
+ package MyDB::Schema::Result::Artist;
+ use base qw/DBIx::Class/;
+
+ __PACKAGE__->load_components(qw/Core/);
+ __PACKAGE__->table('artist');
+ __PACKAGE__->add_columns(qw/ artistid name /);
+ __PACKAGE__->set_primary_key('artistid');
+ __PACKAGE__->has_many(cds => 'MyDB::Schema::Result::CD');
+
+ 1;
+
+ # Create a query (view) based result source, in a result class
+ package MyDB::Schema::Result::Year2000CDs;
+
+ use DBIx::Class::ResultSource::View;
+
+ __PACKAGE__->load_components('Core');
+ __PACKAGE__->table_class('DBIx::Class::ResultSource::View');
+
+ __PACKAGE__->table('year2000cds');
+ __PACKAGE__->result_source_instance->is_virtual(1);
+ __PACKAGE__->result_source_instance->view_definition(
+ "SELECT cdid, artist, title FROM cd WHERE year ='2000'"
+ );
+
+
=head1 DESCRIPTION
-A ResultSource is a component of a schema from which results can be directly
-retrieved, most usually a table (see L<DBIx::Class::ResultSource::Table>)
+A ResultSource is an object that represents a source of data for querying.
-Basic view support also exists, see L<<DBIx::Class::ResultSource::View>.
+This class is a base class for various specialised types of result
+sources, for example L<DBIx::Class::ResultSource::Table>. Table is the
+default result source type, so one is created for you when defining a
+result class as described in the synopsis above.
+More specifically, the L<DBIx::Class::Core> component pulls in the
+L<DBIx::Class::ResultSourceProxy::Table> as a base class, which
+defines the L<table|DBIx::Class::ResultSourceProxy::Table/table>
+method. When called, C<table> creates and stores an instance of
+L<DBIx::Class::ResultSoure::Table>. Luckily, to use tables as result
+sources, you don't need to remember any of this.
+
+Result sources representing select queries, or views, can also be
+created, see L<DBIx::Class::ResultSource::View> for full details.
+
+=head2 Finding result source objects
+
+As mentioned above, a result source instance is created and stored for
+you when you define a L<Result Class|DBIx::Class::Manual::Glossary/Result Class>.
+
+You can retrieve the result source at runtime in the following ways:
+
+=over
+
+=item From a Schema object:
+
+ $schema->source($source_name);
+
+=item From a Row object:
+
+ $row->result_source;
+
+=item From a ResultSet object:
+
+ $rs->result_source;
+
+=back
+
=head1 METHODS
=pod
@@ -69,9 +132,9 @@
$source->add_columns('col1' => \%col1_info, 'col2' => \%col2_info, ...);
-Adds columns to the result source. If supplied key => hashref pairs, uses
-the hashref as the column_info for that column. Repeated calls of this
-method will add more columns, not replace them.
+Adds columns to the result source. If supplied colname => hashref
+pairs, uses the hashref as the L</column_info> for that column. Repeated
+calls of this method will add more columns, not replace them.
The column names given will be created as accessor methods on your
L<DBIx::Class::Row> objects. You can change the name of the accessor
@@ -84,40 +147,62 @@
=item accessor
+ { accessor => '_name' }
+
+ # example use, replace standard accessor with one of your own:
+ sub name {
+ my ($self, $value) = @_;
+
+ die "Name cannot contain digits!" if($value =~ /\d/);
+ $self->_name($value);
+
+ return $self->_name();
+ }
+
Use this to set the name of the accessor method for this column. If unset,
the name of the column will be used.
=item data_type
-This contains the column type. It is automatically filled by the
-L<SQL::Translator::Producer::DBIx::Class::File> producer, and the
-L<DBIx::Class::Schema::Loader> module. If you do not enter a
-data_type, DBIx::Class will attempt to retrieve it from the
-database for you, using L<DBI>'s column_info method. The values of this
-key are typically upper-cased.
+ { data_type => 'integer' }
+This contains the column type. It is automatically filled if you use the
+L<SQL::Translator::Producer::DBIx::Class::File> producer, or the
+L<DBIx::Class::Schema::Loader> module.
+
Currently there is no standard set of values for the data_type. Use
whatever your database supports.
=item size
+ { size => 20 }
+
The length of your column, if it is a column type that can have a size
-restriction. This is currently only used by L<DBIx::Class::Schema/deploy>.
+restriction. This is currently only used to create tables from your
+schema, see L<DBIx::Class::Schema/deploy>.
=item is_nullable
-Set this to a true value for a columns that is allowed to contain
-NULL values. This is currently only used by L<DBIx::Class::Schema/deploy>.
+ { is_nullable => 1 }
+Set this to a true value for a columns that is allowed to contain NULL
+values, default is false. This is currently only used to create tables
+from your schema, see L<DBIx::Class::Schema/deploy>.
+
=item is_auto_increment
+ { is_auto_increment => 1 }
+
Set this to a true value for a column whose value is somehow
-automatically set. This is used to determine which columns to empty
-when cloning objects using L<DBIx::Class::Row/copy>. It is also used by
+automatically set, defaults to false. This is used to determine which
+columns to empty when cloning objects using
+L<DBIx::Class::Row/copy>. It is also used by
L<DBIx::Class::Schema/deploy>.
=item is_numeric
+ { is_numeric => 1 }
+
Set this to a true or false value (not C<undef>) to explicitly specify
if this column contains numeric data. This controls how set_column
decides whether to consider a column dirty after an update: if
@@ -130,22 +215,29 @@
=item is_foreign_key
+ { is_foreign_key => 1 }
+
Set this to a true value for a column that contains a key from a
-foreign table. This is currently only used by
-L<DBIx::Class::Schema/deploy>.
+foreign table, defaults to false. This is currently only used to
+create tables from your schema, see L<DBIx::Class::Schema/deploy>.
=item default_value
-Set this to the default value which will be inserted into a column
-by the database. Can contain either a value or a function (use a
+ { default_value => \'now()' }
+
+Set this to the default value which will be inserted into a column by
+the database. Can contain either a value or a function (use a
reference to a scalar e.g. C<\'now()'> if you want a function). This
-is currently only used by L<DBIx::Class::Schema/deploy>.
+is currently only used to create tables from your schema, see
+L<DBIx::Class::Schema/deploy>.
See the note on L<DBIx::Class::Row/new> for more information about possible
issues related to db-side default values.
=item sequence
+ { sequence => 'my_table_seq' }
+
Set this on a primary key column to the name of the sequence used to
generate a new key value. If not specified, L<DBIx::Class::PK::Auto>
will attempt to retrieve the name of the sequence from the database
@@ -171,13 +263,13 @@
=over
-=item Arguments: $colname, [ \%columninfo ]
+=item Arguments: $colname, \%columninfo?
=item Return value: 1/0 (true/false)
=back
- $source->add_column('col' => \%info?);
+ $source->add_column('col' => \%info);
Add a single column and optional column info. Uses the same column
info keys as L</add_columns>.
@@ -237,8 +329,8 @@
my $info = $source->column_info($col);
Returns the column metadata hashref for a column, as originally passed
-to L</add_columns>. See the description of L</add_columns> for information
-on the contents of the hashref.
+to L</add_columns>. See L</add_columns> above for information on the
+contents of the hashref.
=cut
@@ -362,14 +454,16 @@
=back
-Defines one or more columns as primary key for this source. Should be
+Defines one or more columns as primary key for this source. Must be
called after L</add_columns>.
Additionally, defines a L<unique constraint|add_unique_constraint>
named C<primary>.
The primary key columns are used by L<DBIx::Class::PK::Auto> to
-retrieve automatically created values from the database.
+retrieve automatically created values from the database. They are also
+used as default joining columns when specifying relationships, see
+L<DBIx::Class::Relationship>.
=cut
@@ -408,7 +502,7 @@
=over 4
-=item Arguments: [ $name ], \@colnames
+=item Arguments: $name?, \@colnames
=item Return value: undefined
@@ -426,11 +520,13 @@
__PACKAGE__->add_unique_constraint([ qw/column1 column2/ ]);
-This will result in a unique constraint named C<table_column1_column2>, where
-C<table> is replaced with the table name.
+This will result in a unique constraint named
+C<table_column1_column2>, where C<table> is replaced with the table
+name.
-Unique constraints are used, for example, when you call
-L<DBIx::Class::ResultSet/find>. Only columns in the constraint are searched.
+Unique constraints are used, for example, when you pass the constraint
+name as the C<key> attribute to L<DBIx::Class::ResultSet/find>. Then
+only columns in the constraint are searched.
Throws an error if any of the given column names do not yet exist on
the result source.
@@ -499,7 +595,8 @@
$source->unique_constraints();
-Read-only accessor which returns a hash of unique constraints on this source.
+Read-only accessor which returns a hash of unique constraints on this
+source.
The hash is keyed by constraint name, and contains an arrayref of
column names as values.
@@ -659,12 +756,16 @@
=back
- package My::ResultSetClass;
+ package My::Schema::ResultSet::Artist;
use base 'DBIx::Class::ResultSet';
...
- $source->resultset_class('My::ResultSet::Class');
+ # In the result class
+ __PACKAGE__->resultset_class('My::Schema::ResultSet::Artist');
+ # Or in code
+ $source->resultset_class('My::Schema::ResultSet::Artist');
+
Set the class of the resultset. This is useful if you want to create your
own resultset methods. Create your own class derived from
L<DBIx::Class::ResultSet>, and set it here. If called with no arguments,
@@ -681,6 +782,10 @@
=back
+ # In the result class
+ __PACKAGE__->resultset_attributes({ order_by => [ 'id' ] });
+
+ # Or in code
$source->resultset_attributes({ order_by => [ 'id' ] });
Store a collection of resultset attributes, that will be set on every
Modified: DBIx-Class/0.08/trunk/lib/DBIx/Class.pm
===================================================================
--- DBIx-Class/0.08/trunk/lib/DBIx/Class.pm 2009-08-02 10:41:25 UTC (rev 7166)
+++ DBIx-Class/0.08/trunk/lib/DBIx/Class.pm 2009-08-02 12:10:53 UTC (rev 7167)
@@ -117,7 +117,7 @@
# Output all artists names
# $artist here is a DBIx::Class::Row, which has accessors
- # for all its columns.
+ # for all its columns. Rows are also subclasses of your Result class.
foreach $artist (@artists) {
print $artist->name, "\n";
}
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