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1 | package DBIx::Class::InflateColumn::DateTime; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | use base qw/DBIx::Class/; |
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6 | use Carp::Clan qw/^DBIx::Class/; |
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7 | |
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8 | =head1 NAME |
9 | |
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10 | DBIx::Class::InflateColumn::DateTime - Auto-create DateTime objects from date and datetime columns. |
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11 | |
12 | =head1 SYNOPSIS |
13 | |
14 | Load this component and then declare one or more |
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15 | columns to be of the datetime, timestamp or date datatype. |
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16 | |
17 | package Event; |
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18 | __PACKAGE__->load_components(qw/InflateColumn::DateTime Core/); |
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19 | __PACKAGE__->add_columns( |
20 | starts_when => { data_type => 'datetime' } |
21 | ); |
22 | |
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23 | NOTE: You B<must> load C<InflateColumn::DateTime> B<before> C<Core>. See |
24 | L<DBIx::Class::Manual::Component> for details. |
25 | |
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26 | Then you can treat the specified column as a L<DateTime> object. |
27 | |
28 | print "This event starts the month of ". |
29 | $event->starts_when->month_name(); |
30 | |
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31 | If you want to set a specific timezone and locale for that field, use: |
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32 | |
33 | __PACKAGE__->add_columns( |
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34 | starts_when => { data_type => 'datetime', timezone => "America/Chicago", locale => "de_DE" } |
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35 | ); |
36 | |
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37 | If you want to inflate no matter what data_type your column is, |
38 | use inflate_datetime or inflate_date: |
39 | |
40 | __PACKAGE__->add_columns( |
41 | starts_when => { data_type => 'varchar', inflate_datetime => 1 } |
42 | ); |
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43 | |
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44 | __PACKAGE__->add_columns( |
45 | starts_when => { data_type => 'varchar', inflate_date => 1 } |
46 | ); |
47 | |
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48 | It's also possible to explicitly skip inflation: |
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49 | |
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50 | __PACKAGE__->add_columns( |
51 | starts_when => { data_type => 'datetime', inflate_datetime => 0 } |
52 | ); |
53 | |
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54 | NOTE: Don't rely on C<InflateColumn::DateTime> to parse date strings for you. |
55 | The column is set directly for any non-references and C<InflateColumn::DateTime> |
56 | is completely bypassed. Instead, use an input parser to create a DateTime |
57 | object. For instance, if your user input comes as a 'YYYY-MM-DD' string, you can |
58 | use C<DateTime::Format::ISO8601> thusly: |
d6aed638 |
59 | |
60 | use DateTime::Format::ISO8601; |
61 | my $dt = DateTime::Format::ISO8601->parse_datetime('YYYY-MM-DD'); |
62 | |
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63 | =head1 DESCRIPTION |
64 | |
65 | This module figures out the type of DateTime::Format::* class to |
66 | inflate/deflate with based on the type of DBIx::Class::Storage::DBI::* |
67 | that you are using. If you switch from one database to a different |
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68 | one your code should continue to work without modification (though note |
69 | that this feature is new as of 0.07, so it may not be perfect yet - bug |
70 | reports to the list very much welcome). |
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71 | |
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72 | For more help with using components, see L<DBIx::Class::Manual::Component/USING>. |
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73 | |
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74 | =cut |
75 | |
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76 | __PACKAGE__->load_components(qw/InflateColumn/); |
77 | |
78 | __PACKAGE__->mk_group_accessors('simple' => '__datetime_parser'); |
79 | |
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80 | =head2 register_column |
81 | |
82 | Chains with the L<DBIx::Class::Row/register_column> method, and sets |
83 | up datetime columns appropriately. This would not normally be |
84 | directly called by end users. |
85 | |
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86 | In the case of an invalid date, L<DateTime> will throw an exception. To |
87 | bypass these exceptions and just have the inflation return undef, use |
88 | the C<datetime_undef_if_invalid> option in the column info: |
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89 | |
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90 | "broken_date", |
91 | { |
92 | data_type => "datetime", |
93 | default_value => '0000-00-00', |
94 | is_nullable => 1, |
95 | datetime_undef_if_invalid => 1 |
96 | } |
97 | |
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98 | =cut |
99 | |
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100 | sub register_column { |
101 | my ($self, $column, $info, @rest) = @_; |
102 | $self->next::method($column, $info, @rest); |
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103 | return unless defined($info->{data_type}); |
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104 | |
105 | my $type; |
106 | |
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107 | for (qw/date datetime timestamp/) { |
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108 | my $key = "inflate_${_}"; |
109 | |
110 | next unless exists $info->{$key}; |
111 | return unless $info->{$key}; |
112 | |
113 | $type = $_; |
114 | last; |
115 | } |
116 | |
117 | unless ($type) { |
118 | $type = lc($info->{data_type}); |
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119 | if ($type eq "timestamp with time zone" || $type eq "timestamptz") { |
120 | $type = "timestamp"; |
121 | $info->{_ic_dt_method} ||= "timestamp_with_timezone"; |
65b386df |
122 | } elsif ($type eq "timestamp without time zone") { |
123 | $type = "timestamp"; |
124 | $info->{_ic_dt_method} ||= "timestamp_without_timezone"; |
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125 | } elsif ($type eq "smalldatetime") { |
126 | $type = "datetime"; |
127 | $info->{_ic_dt_method} ||= "datetime"; |
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128 | } |
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129 | } |
130 | |
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131 | my $timezone; |
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132 | if ( defined $info->{extra}{timezone} ) { |
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133 | carp "Putting timezone into extra => { timezone => '...' } has been deprecated, ". |
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134 | "please put it directly into the '$column' column definition."; |
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135 | $timezone = $info->{extra}{timezone}; |
136 | } |
137 | |
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138 | my $locale; |
139 | if ( defined $info->{extra}{locale} ) { |
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140 | carp "Putting locale into extra => { locale => '...' } has been deprecated, ". |
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141 | "please put it directly into the '$column' column definition."; |
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142 | $locale = $info->{extra}{locale}; |
143 | } |
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144 | |
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145 | $locale = $info->{locale} if defined $info->{locale}; |
146 | $timezone = $info->{timezone} if defined $info->{timezone}; |
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147 | |
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148 | my $undef_if_invalid = $info->{datetime_undef_if_invalid}; |
149 | |
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150 | if ($type eq 'datetime' || $type eq 'date' || $type eq 'timestamp') { |
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151 | # This shallow copy of %info avoids t/52_cycle.t treating |
152 | # the resulting deflator as a circular reference. |
153 | my %info = ( '_ic_dt_method' => $type , %{ $info } ); |
154 | |
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155 | if (defined $info->{extra}{floating_tz_ok}) { |
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156 | carp "Putting floating_tz_ok into extra => { floating_tz_ok => 1 } has been deprecated, ". |
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157 | "please put it directly into the '$column' column definition."; |
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158 | $info{floating_tz_ok} = $info->{extra}{floating_tz_ok}; |
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159 | } |
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160 | |
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161 | $self->inflate_column( |
162 | $column => |
163 | { |
164 | inflate => sub { |
165 | my ($value, $obj) = @_; |
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166 | |
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167 | my $dt = eval { $obj->_inflate_to_datetime( $value, \%info ) }; |
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168 | if (my $err = $@ ) { |
169 | return undef if ($undef_if_invalid); |
170 | $self->throw_exception ("Error while inflating ${value} for ${column} on ${self}: $err"); |
171 | } |
172 | |
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173 | $dt->set_time_zone($timezone) if $timezone; |
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174 | $dt->set_locale($locale) if $locale; |
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175 | return $dt; |
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176 | }, |
177 | deflate => sub { |
178 | my ($value, $obj) = @_; |
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179 | if ($timezone) { |
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180 | carp "You're using a floating timezone, please see the documentation of" |
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181 | . " DBIx::Class::InflateColumn::DateTime for an explanation" |
182 | if ref( $value->time_zone ) eq 'DateTime::TimeZone::Floating' |
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183 | and not $info{floating_tz_ok} |
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184 | and not $ENV{DBIC_FLOATING_TZ_OK}; |
185 | $value->set_time_zone($timezone); |
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186 | $value->set_locale($locale) if $locale; |
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187 | } |
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188 | $obj->_deflate_from_datetime( $value, \%info ); |
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189 | }, |
190 | } |
191 | ); |
192 | } |
193 | } |
194 | |
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195 | sub _flate_or_fallback |
196 | { |
197 | my( $self, $value, $info, $method_fmt ) = @_; |
198 | |
199 | my $parser = $self->_datetime_parser; |
200 | my $preferred_method = sprintf($method_fmt, $info->{ _ic_dt_method }); |
201 | my $method = $parser->can($preferred_method) ? $preferred_method : sprintf($method_fmt, 'datetime'); |
202 | return $parser->$method($value); |
203 | } |
204 | |
205 | sub _inflate_to_datetime { |
206 | my( $self, $value, $info ) = @_; |
207 | return $self->_flate_or_fallback( $value, $info, 'parse_%s' ); |
208 | } |
209 | |
210 | sub _deflate_from_datetime { |
211 | my( $self, $value, $info ) = @_; |
212 | return $self->_flate_or_fallback( $value, $info, 'format_%s' ); |
213 | } |
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214 | |
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215 | sub _datetime_parser { |
216 | my $self = shift; |
217 | if (my $parser = $self->__datetime_parser) { |
218 | return $parser; |
219 | } |
220 | my $parser = $self->result_source->storage->datetime_parser(@_); |
221 | return $self->__datetime_parser($parser); |
222 | } |
223 | |
224 | 1; |
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225 | __END__ |
226 | |
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227 | =head1 USAGE NOTES |
228 | |
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229 | If you have a datetime column with an associated C<timezone>, and subsequently |
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230 | create/update this column with a DateTime object in the L<DateTime::TimeZone::Floating> |
231 | timezone, you will get a warning (as there is a very good chance this will not have the |
232 | result you expect). For example: |
233 | |
234 | __PACKAGE__->add_columns( |
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235 | starts_when => { data_type => 'datetime', timezone => "America/Chicago" } |
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236 | ); |
237 | |
238 | my $event = $schema->resultset('EventTZ')->create({ |
239 | starts_at => DateTime->new(year=>2007, month=>12, day=>31, ), |
240 | }); |
241 | |
242 | The warning can be avoided in several ways: |
243 | |
244 | =over |
245 | |
246 | =item Fix your broken code |
247 | |
248 | When calling C<set_time_zone> on a Floating DateTime object, the timezone is simply |
249 | set to the requested value, and B<no time conversion takes place>. It is always a good idea |
250 | to be supply explicit times to the database: |
251 | |
252 | my $event = $schema->resultset('EventTZ')->create({ |
253 | starts_at => DateTime->new(year=>2007, month=>12, day=>31, time_zone => "America/Chicago" ), |
254 | }); |
255 | |
256 | =item Suppress the check on per-column basis |
257 | |
258 | __PACKAGE__->add_columns( |
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259 | starts_when => { data_type => 'datetime', timezone => "America/Chicago", floating_tz_ok => 1 } |
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260 | ); |
261 | |
262 | =item Suppress the check globally |
263 | |
264 | Set the environment variable DBIC_FLOATING_TZ_OK to some true value. |
265 | |
266 | =back |
267 | |
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268 | Putting extra attributes like timezone, locale or floating_tz_ok into extra => {} has been |
269 | B<DEPRECATED> because this gets you into trouble using L<DBIx::Class::Schema::Versioned>. |
270 | Instead put it directly into the columns definition like in the examples above. If you still |
271 | use the old way you'll see a warning - please fix your code then! |
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272 | |
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273 | =head1 SEE ALSO |
274 | |
275 | =over 4 |
276 | |
277 | =item More information about the add_columns method, and column metadata, |
278 | can be found in the documentation for L<DBIx::Class::ResultSource>. |
279 | |
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280 | =item Further discussion of problems inherent to the Floating timezone: |
281 | L<Floating DateTimes|DateTime/Floating_DateTimes> |
282 | and L<< $dt->set_time_zone|DateTime/"Set" Methods >> |
283 | |
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284 | =back |
285 | |
286 | =head1 AUTHOR |
287 | |
288 | Matt S. Trout <mst@shadowcatsystems.co.uk> |
289 | |
290 | =head1 CONTRIBUTORS |
291 | |
292 | Aran Deltac <bluefeet@cpan.org> |
293 | |
294 | =head1 LICENSE |
295 | |
296 | You may distribute this code under the same terms as Perl itself. |
297 | |