Merge 'trunk' into 'DBIx-Class-resultset'
[dbsrgits/DBIx-Class.git] / lib / DBIx / Class / Table.pm
1 package DBIx::Class::Table;
2
3 use strict;
4 use warnings;
5
6 use DBIx::Class::ResultSet;
7
8 use Carp qw/croak/;
9
10 use base qw/DBIx::Class/;
11 __PACKAGE__->load_components(qw/AccessorGroup/);
12
13 __PACKAGE__->mk_group_accessors('simple' =>
14   qw/_columns _primaries name resultset_class result_class storage/);
15
16 =head1 NAME 
17
18 DBIx::Class::Table - Table object
19
20 =head1 SYNOPSIS
21
22 =head1 DESCRIPTION
23
24 This class is responsible for defining and doing table-level operations on 
25 L<DBIx::Class> classes.
26
27 =head1 METHODS
28
29 =cut
30
31 sub new {
32   my ($class, $attrs) = @_;
33   $class = ref $class if ref $class;
34   my $new = bless({ %{$attrs || {}} }, $class);
35   $new->{resultset_class} ||= 'DBIx::Class::ResultSet';
36   $new->{_columns} ||= {};
37   $new->{name} ||= "!!NAME NOT SET!!";
38   return $new;
39 }
40
41 sub add_columns {
42   my ($self, @cols) = @_;
43   while (my $col = shift @cols) {
44     $self->_columns->{$col} = (ref $cols[0] ? shift : {});
45   }
46 }
47
48 *add_column = \&add_columns;
49
50 =head2 add_columns
51
52   $table->add_columns(qw/col1 col2 col3/);
53
54   $table->add_columns('col1' => \%col1_info, 'col2' => \%col2_info, ...);
55
56 Adds columns to the table object. If supplied key => hashref pairs uses
57 the hashref as the column_info for that column.
58
59 =head2 add_column
60
61   $table->add_column('col' => \%info?);
62
63 Convenience alias to add_columns
64
65 =cut
66
67 sub resultset {
68   my $self = shift;
69   return $self->{resultset} ||= $self->resultset_class->new($self);
70 }
71
72 =head2 has_column                                                                
73                                                                                 
74   if ($obj->has_column($col)) { ... }                                           
75                                                                                 
76 Returns 1 if the table has a column of this name, 0 otherwise.                  
77                                                                                 
78 =cut                                                                            
79
80 sub has_column {
81   my ($self, $column) = @_;
82   return exists $self->_columns->{$column};
83 }
84
85 =head2 column_info                                                               
86                                                                                 
87   my $info = $obj->column_info($col);                                           
88                                                                                 
89 Returns the column metadata hashref for a column.
90                                                                                 
91 =cut                                                                            
92
93 sub column_info {
94   my ($self, $column) = @_;
95   croak "No such column $column" unless exists $self->_columns->{$column};
96   return $self->_columns->{$column};
97 }
98
99 =head2 columns
100
101   my @column_names = $obj->columns;                                             
102                                                                                 
103 =cut                                                                            
104
105 sub columns {
106   croak "columns() is a read-only accessor, did you mean add_columns()?" if (@_ > 1);
107   return keys %{shift->_columns};
108 }
109
110 =head2 set_primary_key(@cols)                                                   
111                                                                                 
112 Defines one or more columns as primary key for this table. Should be            
113 called after C<add_columns>.
114                                                                                 
115 =cut                                                                            
116
117 sub set_primary_key {
118   my ($self, @cols) = @_;
119   # check if primary key columns are valid columns
120   for (@cols) {
121     $self->throw("No such column $_ on table ".$self->name)
122       unless $self->has_column($_);
123   }
124   $self->_primaries(\@cols);
125 }
126
127 =head2 primary_columns                                                          
128                                                                                 
129 Read-only accessor which returns the list of primary keys.
130                                                                                 
131 =cut                                                                            
132
133 sub primary_columns {
134   return @{shift->_primaries||[]};
135 }
136
137 =head2 from
138
139 Returns the FROM entry for the table (i.e. the table name)
140
141 =cut
142
143 sub from { return shift->name(@_); }
144
145
146 1;
147
148 =head1 AUTHORS
149
150 Matt S. Trout <mst@shadowcatsystems.co.uk>
151
152 =head1 LICENSE
153
154 You may distribute this code under the same terms as Perl itself.
155
156 =cut
157