Commit | Line | Data |
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 || {} } }; |
c7ce65e6 |
15 | my %seen; |
16 | $attrs->{cols} ||= [ map { "me.$_" } $db_class->_select_columns ]; |
17 | $attrs->{from} ||= [ { 'me' => $db_class->_table_name } ]; |
fef5d100 |
18 | if ($attrs->{join}) { |
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19 | foreach my $j (ref $attrs->{join} eq 'ARRAY' |
20 | ? (@{$attrs->{join}}) : ($attrs->{join})) { |
21 | if (ref $j eq 'HASH') { |
22 | $seen{$_} = 1 foreach keys %$j; |
23 | } else { |
24 | $seen{$j} = 1; |
25 | } |
26 | } |
27 | push(@{$attrs->{from}}, $db_class->_resolve_join($attrs->{join}, 'me')); |
28 | } |
29 | foreach my $pre (@{$attrs->{prefetch} || []}) { |
30 | push(@{$attrs->{from}}, $db_class->_resolve_join($pre, 'me')) |
31 | unless $seen{$pre}; |
32 | push(@{$attrs->{cols}}, |
33 | map { "$pre.$_" } |
34 | $db_class->_relationships->{$pre}->{class}->columns); |
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35 | } |
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36 | my $new = { |
37 | class => $db_class, |
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38 | cols => $attrs->{cols} || [ $db_class->_select_columns ], |
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39 | cond => $attrs->{where}, |
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40 | from => $attrs->{from} || $db_class->_table_name, |
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41 | count => undef, |
42 | pager => undef, |
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43 | attrs => $attrs }; |
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44 | bless ($new, $it_class); |
45 | $new->pager if ($attrs->{page}); |
46 | return $new; |
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47 | } |
48 | |
73f58123 |
49 | sub cursor { |
50 | my ($self) = @_; |
51 | my ($db_class, $attrs) = @{$self}{qw/class attrs/}; |
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52 | if ($attrs->{page}) { |
53 | $attrs->{rows} = $self->pager->entries_per_page; |
54 | $attrs->{offset} = $self->pager->skipped; |
55 | } |
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56 | return $self->{cursor} |
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57 | ||= $db_class->storage->select($self->{from}, $self->{cols}, |
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58 | $attrs->{where},$attrs); |
59 | } |
60 | |
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61 | sub slice { |
62 | my ($self, $min, $max) = @_; |
63 | my $attrs = { %{ $self->{attrs} || {} } }; |
64 | $self->{class}->throw("Can't slice without where") unless $attrs->{where}; |
65 | $attrs->{offset} = $min; |
66 | $attrs->{rows} = ($max ? ($max - $min + 1) : 1); |
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67 | my $slice = $self->new($self->{class}, $attrs); |
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68 | return (wantarray ? $slice->all : $slice); |
69 | } |
70 | |
71 | sub next { |
72 | my ($self) = @_; |
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73 | my @row = $self->cursor->next; |
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74 | return unless (@row); |
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75 | return $self->_construct_object(@row); |
76 | } |
77 | |
78 | sub _construct_object { |
79 | my ($self, @row) = @_; |
80 | my @cols = $self->{class}->_select_columns; |
81 | unless ($self->{attrs}{prefetch}) { |
82 | return $self->{class}->_row_to_object(\@cols, \@row); |
83 | } else { |
84 | my @main = splice(@row, 0, scalar @cols); |
85 | my $new = $self->{class}->_row_to_object(\@cols, \@main); |
86 | PRE: foreach my $pre (@{$self->{attrs}{prefetch}}) { |
87 | my $rel_obj = $self->{class}->_relationships->{$pre}; |
88 | my @pre_cols = $rel_obj->{class}->columns; |
89 | my @vals = splice(@row, 0, scalar @pre_cols); |
90 | my $fetched = $rel_obj->{class}->_row_to_object(\@pre_cols, \@vals); |
91 | $self->{class}->throw("No accessor for prefetched $pre") |
92 | unless defined $rel_obj->{attrs}{accessor}; |
93 | if ($rel_obj->{attrs}{accessor} eq 'single') { |
94 | foreach my $pri ($rel_obj->{class}->primary_columns) { |
95 | next PRE unless defined $fetched->get_column($pri); |
96 | } |
97 | $new->{_relationship_data}{$pre} = $fetched; |
98 | } elsif ($rel_obj->{attrs}{accessor} eq 'filter') { |
99 | $new->{_inflated_column}{$pre} = $fetched; |
100 | } else { |
101 | $self->{class}->throw("Don't know to to store prefetched $pre"); |
102 | } |
103 | } |
104 | return $new; |
105 | } |
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106 | } |
107 | |
108 | sub count { |
109 | my ($self) = @_; |
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110 | my $db_class = $self->{class}; |
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111 | my $attrs = { %{ $self->{attrs} } }; |
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112 | unless ($self->{count}) { |
113 | # offset and order by are not needed to count |
114 | delete $attrs->{$_} for qw/offset order_by/; |
115 | |
116 | my @cols = 'COUNT(*)'; |
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117 | $self->{count} = $db_class->storage->select_single($self->{from}, \@cols, |
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118 | $self->{cond}, $attrs); |
119 | } |
120 | return 0 unless $self->{count}; |
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121 | return $self->{pager}->entries_on_this_page if ($self->{pager}); |
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122 | return ( $attrs->{rows} && $attrs->{rows} < $self->{count} ) |
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123 | ? $attrs->{rows} |
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124 | : $self->{count}; |
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125 | } |
126 | |
127 | sub all { |
128 | my ($self) = @_; |
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129 | return map { $self->_construct_object(@$_); } |
73f58123 |
130 | $self->cursor->all; |
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131 | } |
132 | |
133 | sub reset { |
134 | my ($self) = @_; |
73f58123 |
135 | $self->cursor->reset; |
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136 | return $self; |
137 | } |
138 | |
139 | sub first { |
140 | return $_[0]->reset->next; |
141 | } |
142 | |
28927b50 |
143 | sub delete { |
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144 | my ($self) = @_; |
145 | $_->delete for $self->all; |
146 | return 1; |
147 | } |
148 | |
28927b50 |
149 | *delete_all = \&delete; # Yeah, yeah, yeah ... |
150 | |
3c5b25c5 |
151 | sub pager { |
152 | my ($self) = @_; |
153 | my $attrs = $self->{attrs}; |
154 | delete $attrs->{offset}; |
155 | my $rows_per_page = delete $attrs->{rows} || 10; |
156 | $self->{pager} ||= Data::Page->new( |
157 | $self->count, $rows_per_page, $attrs->{page} || 1); |
158 | $attrs->{rows} = $rows_per_page; |
159 | return $self->{pager}; |
160 | } |
161 | |
162 | sub page { |
163 | my ($self, $page) = @_; |
164 | my $attrs = $self->{attrs}; |
165 | $attrs->{page} = $page; |
166 | return $self->new($self->{class}, $attrs); |
167 | } |
168 | |
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169 | 1; |