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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 $f_class"; |
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9 | if ($@) { |
10 | $class->throw($@) unless $@ =~ /Can't locate/; |
11 | } |
12 | |
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13 | my %f_primaries; |
14 | $f_primaries{$_} = 1 for eval { $f_class->primary_columns }; |
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15 | my $f_loaded = !$@; |
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16 | # single key relationship |
17 | if (not defined $cond) { |
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18 | $class->throw("Can't infer join condition for ${rel} on ${class}; unable to load ${f_class}") unless $f_loaded; |
19 | my ($pri, $too_many) = keys %f_primaries; |
20 | $class->throw("Can't infer join condition for ${rel} on ${class}; ${f_class} has multiple primary key") if $too_many; |
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21 | $class->throw("Can't find any primary keys for $f_class, try adding some") if !$pri; |
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22 | my $acc_type = ($class->has_column($rel)) ? 'filter' : 'single'; |
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23 | $class->add_relationship($rel, $f_class, |
24 | { "foreign.${pri}" => "self.${rel}" }, |
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25 | { accessor => $acc_type, %{$attrs || {}} } |
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26 | ); |
27 | } |
28 | # multiple key relationship |
29 | else { |
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30 | my $cond_rel; |
31 | for (keys %$cond) { |
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32 | if (m/\./) { # Explicit join condition |
33 | $cond_rel = $cond; |
34 | last; |
35 | } |
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36 | $cond_rel->{"foreign.$_"} = "self.".$cond->{$_}; |
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37 | } |
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38 | $class->add_relationship($rel, $f_class, |
39 | $cond_rel, |
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40 | { accessor => 'single', %{$attrs || {}} } |
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41 | ); |
42 | } |
43 | return 1; |
44 | } |
45 | |
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46 | =head1 AUTHORS |
47 | |
48 | Alexander Hartmaier <Alexander.Hartmaier@t-systems.at> |
49 | |
50 | Matt S. Trout <mst@shadowcatsystems.co.uk> |
51 | |
52 | =cut |
53 | |
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54 | 1; |