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07037f89 |
1 | package DBIx::Class::Relationship::BelongsTo; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
6 | sub belongs_to { |
7 | my ($class, $rel, $f_class, $cond, $attrs) = @_; |
8 | eval "require $f_class"; |
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9 | my %f_primaries = eval { %{ $f_class->_primaries } }; |
10 | my $f_loaded = !$@; |
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11 | # single key relationship |
12 | if (not defined $cond) { |
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13 | $class->throw("Can't infer join condition for ${rel} on ${class}; unable to load ${f_class}") unless $f_loaded; |
14 | my ($pri, $too_many) = keys %f_primaries; |
15 | $class->throw("Can't infer join condition for ${rel} on ${class}; ${f_class} has multiple primary key") if $too_many; |
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16 | my $acc_type = ($class->_columns->{$rel}) ? 'filter' : 'single'; |
17 | $class->add_relationship($rel, $f_class, |
18 | { "foreign.${pri}" => "self.${rel}" }, |
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19 | { accessor => $acc_type, %{$attrs || {}} } |
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20 | ); |
21 | } |
22 | # multiple key relationship |
23 | else { |
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24 | my $cond_rel; |
25 | for (keys %$cond) { |
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26 | if (m/\./) { # Explicit join condition |
27 | $cond_rel = $cond; |
28 | last; |
29 | } |
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30 | $cond_rel->{"foreign.$_"} = "self.".$cond->{$_}; |
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31 | } |
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32 | $class->add_relationship($rel, $f_class, |
33 | $cond_rel, |
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34 | { accessor => 'single', %{$attrs || {}} } |
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35 | ); |
36 | } |
37 | return 1; |
38 | } |
39 | |
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40 | =head1 AUTHORS |
41 | |
42 | Alexander Hartmaier <Alexander.Hartmaier@t-systems.at> |
43 | |
44 | Matt S. Trout <mst@shadowcatsystems.co.uk> |
45 | |
46 | =cut |
47 | |
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48 | 1; |