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89c0a5a2 |
1 | package DBIx::Class::ResultSet; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | use overload |
6 | '0+' => 'count', |
7 | fallback => 1; |
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8 | use Data::Page; |
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9 | |
10 | sub new { |
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11 | my ($it_class, $db_class, $attrs) = @_; |
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12 | #use Data::Dumper; warn Dumper(@_); |
13 | $it_class = ref $it_class if ref $it_class; |
14 | $attrs = { %{ $attrs || {} } }; |
fef5d100 |
15 | if ($attrs->{join}) { |
16 | $attrs->{from} = [ { 'me' => $db_class->_table_name }, |
17 | $db_class->_resolve_join($attrs->{join}, 'me') ]; |
18 | $attrs->{cols} = [ map { "me.$_" } $db_class->_select_columns ]; |
19 | } |
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20 | my $new = { |
21 | class => $db_class, |
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22 | cols => $attrs->{cols} || [ $db_class->_select_columns ], |
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23 | cond => $attrs->{where}, |
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24 | from => $attrs->{from} || $db_class->_table_name, |
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25 | count => undef, |
26 | pager => undef, |
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27 | attrs => $attrs }; |
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28 | bless ($new, $it_class); |
29 | $new->pager if ($attrs->{page}); |
30 | return $new; |
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31 | } |
32 | |
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33 | sub cursor { |
34 | my ($self) = @_; |
35 | my ($db_class, $attrs) = @{$self}{qw/class attrs/}; |
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36 | if ($attrs->{page}) { |
37 | $attrs->{rows} = $self->pager->entries_per_page; |
38 | $attrs->{offset} = $self->pager->skipped; |
39 | } |
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40 | return $self->{cursor} |
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41 | ||= $db_class->storage->select($self->{from}, $self->{cols}, |
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42 | $attrs->{where},$attrs); |
43 | } |
44 | |
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45 | sub slice { |
46 | my ($self, $min, $max) = @_; |
47 | my $attrs = { %{ $self->{attrs} || {} } }; |
48 | $self->{class}->throw("Can't slice without where") unless $attrs->{where}; |
49 | $attrs->{offset} = $min; |
50 | $attrs->{rows} = ($max ? ($max - $min + 1) : 1); |
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51 | my $slice = $self->new($self->{class}, $attrs); |
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52 | return (wantarray ? $slice->all : $slice); |
53 | } |
54 | |
55 | sub next { |
56 | my ($self) = @_; |
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57 | my @row = $self->cursor->next; |
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58 | return unless (@row); |
59 | return $self->{class}->_row_to_object($self->{cols}, \@row); |
60 | } |
61 | |
62 | sub count { |
63 | my ($self) = @_; |
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64 | my $db_class = $self->{class}; |
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65 | my $attrs = { %{ $self->{attrs} } }; |
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66 | unless ($self->{count}) { |
67 | # offset and order by are not needed to count |
68 | delete $attrs->{$_} for qw/offset order_by/; |
69 | |
70 | my @cols = 'COUNT(*)'; |
fef5d100 |
71 | $self->{count} = $db_class->storage->select_single($self->{from}, \@cols, |
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72 | $self->{cond}, $attrs); |
73 | } |
74 | return 0 unless $self->{count}; |
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75 | return $self->{pager}->entries_on_this_page if ($self->{pager}); |
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76 | return ( $attrs->{rows} && $attrs->{rows} < $self->{count} ) |
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77 | ? $attrs->{rows} |
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78 | : $self->{count}; |
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79 | } |
80 | |
81 | sub all { |
82 | my ($self) = @_; |
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83 | return map { $self->{class}->_row_to_object($self->{cols}, $_); } |
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84 | $self->cursor->all; |
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85 | } |
86 | |
87 | sub reset { |
88 | my ($self) = @_; |
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89 | $self->cursor->reset; |
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90 | return $self; |
91 | } |
92 | |
93 | sub first { |
94 | return $_[0]->reset->next; |
95 | } |
96 | |
28927b50 |
97 | sub delete { |
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98 | my ($self) = @_; |
99 | $_->delete for $self->all; |
100 | return 1; |
101 | } |
102 | |
28927b50 |
103 | *delete_all = \&delete; # Yeah, yeah, yeah ... |
104 | |
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105 | sub pager { |
106 | my ($self) = @_; |
107 | my $attrs = $self->{attrs}; |
108 | delete $attrs->{offset}; |
109 | my $rows_per_page = delete $attrs->{rows} || 10; |
110 | $self->{pager} ||= Data::Page->new( |
111 | $self->count, $rows_per_page, $attrs->{page} || 1); |
112 | $attrs->{rows} = $rows_per_page; |
113 | return $self->{pager}; |
114 | } |
115 | |
116 | sub page { |
117 | my ($self, $page) = @_; |
118 | my $attrs = $self->{attrs}; |
119 | $attrs->{page} = $page; |
120 | return $self->new($self->{class}, $attrs); |
121 | } |
122 | |
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123 | 1; |