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1 | package MooseX::UndefTolerant::Constructor; |
2 | use Moose::Role; |
3 | |
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4 | around _generate_slot_initializer => sub { |
5 | my $orig = shift; |
6 | my $self = shift; |
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7 | |
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8 | # note the key in the params may not match the attr name. |
9 | my $key_name = $self->_attributes->[$_[0]]->init_arg; |
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10 | |
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11 | # insert a line of code at the start of the initializer, |
12 | # clearing the param if it's undefined. |
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13 | |
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14 | if (defined $key_name) |
15 | { |
16 | # leave the value unscathed if the attribute's type constraint can |
17 | # handle undef (or doesn't have one, which implicitly means it can) |
18 | my $type_constraint = $self->_attributes->[$_[0]]->type_constraint; |
19 | if ($type_constraint and not $type_constraint->check(undef)) |
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20 | { |
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21 | my $tolerant_code = |
22 | qq# delete \$params->{'$key_name'} unless # . |
23 | qq# exists \$params->{'$key_name'} && defined \$params->{'$key_name'};\n#; |
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24 | |
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25 | return $tolerant_code . $self->$orig(@_); |
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26 | } |
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27 | } |
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28 | |
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29 | return $self->$orig(@_); |
30 | }; |
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31 | |
32 | no Moose::Role; |
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33 | 1; |