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1 | package SQL::Translator::Schema::Constraint; |
2 | |
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3 | =pod |
4 | |
5 | =head1 NAME |
6 | |
7 | SQL::Translator::Schema::Constraint - SQL::Translator constraint object |
8 | |
9 | =head1 SYNOPSIS |
10 | |
11 | use SQL::Translator::Schema::Constraint; |
12 | my $constraint = SQL::Translator::Schema::Constraint->new( |
13 | name => 'foo', |
14 | fields => [ id ], |
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15 | type => PRIMARY_KEY, |
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16 | ); |
17 | |
18 | =head1 DESCRIPTION |
19 | |
20 | C<SQL::Translator::Schema::Constraint> is the constraint object. |
21 | |
22 | =head1 METHODS |
23 | |
24 | =cut |
25 | |
96a5759e |
26 | use Moo; |
43b9dc7a |
27 | use SQL::Translator::Schema::Constants; |
0fb58589 |
28 | use SQL::Translator::Utils qw(ex2err throw); |
29 | use SQL::Translator::Role::ListAttr; |
96a5759e |
30 | use SQL::Translator::Types qw(schema_obj); |
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31 | |
954ed12e |
32 | extends 'SQL::Translator::Schema::Object'; |
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33 | |
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34 | our $VERSION = '1.59'; |
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35 | |
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36 | my %VALID_CONSTRAINT_TYPE = ( |
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37 | PRIMARY_KEY, 1, |
38 | UNIQUE, 1, |
39 | CHECK_C, 1, |
40 | FOREIGN_KEY, 1, |
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41 | NOT_NULL, 1, |
42 | ); |
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43 | |
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44 | =head2 new |
45 | |
46 | Object constructor. |
47 | |
48 | my $schema = SQL::Translator::Schema::Constraint->new( |
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49 | table => $table, # table to which it belongs |
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50 | type => 'foreign_key', # type of table constraint |
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51 | name => 'fk_phone_id', # name of the constraint |
52 | fields => 'phone_id', # field in the referring table |
65157eda |
53 | reference_fields => 'phone_id', # referenced field |
54 | reference_table => 'phone', # referenced table |
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55 | match_type => 'full', # how to match |
2d034ab4 |
56 | on_delete => 'cascade', # what to do on deletes |
57 | on_update => '', # what to do on updates |
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58 | ); |
59 | |
60 | =cut |
61 | |
96a5759e |
62 | # Override to remove empty arrays from args. |
63 | # t/14postgres-parser breaks without this. |
64 | around BUILDARGS => sub { |
65 | my $orig = shift; |
9371be50 |
66 | my $self = shift; |
96a5759e |
67 | my $args = $self->$orig(@_); |
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68 | |
96a5759e |
69 | foreach my $arg (keys %{$args}) { |
46ad748f |
70 | delete $args->{$arg} if ref($args->{$arg}) eq "ARRAY" && !@{$args->{$arg}}; |
96a5759e |
71 | } |
72 | if (exists $args->{fields}) { |
73 | $args->{field_names} = delete $args->{fields}; |
74 | } |
75 | return $args; |
76 | }; |
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77 | |
78 | =head2 deferrable |
79 | |
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80 | Get or set whether the constraint is deferrable. If not defined, |
43b9dc7a |
81 | then returns "1." The argument is evaluated by Perl for True or |
82 | False, so the following are eqivalent: |
83 | |
84 | $deferrable = $field->deferrable(0); |
85 | $deferrable = $field->deferrable(''); |
86 | $deferrable = $field->deferrable('0'); |
87 | |
88 | =cut |
89 | |
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90 | has deferrable => ( is => 'rw', coerce => sub { $_[0] ? 1 : 0 }, default => sub { 1 } ); |
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91 | |
92 | =head2 expression |
93 | |
94 | Gets and set the expression used in a CHECK constraint. |
95 | |
96 | my $expression = $constraint->expression('...'); |
97 | |
98 | =cut |
99 | |
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100 | has expression => ( is => 'rw', default => sub { '' } ); |
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101 | |
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102 | around expression => sub { |
103 | my ($orig, $self, $arg) = @_; |
104 | $self->$orig($arg || ()); |
105 | }; |
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106 | |
43b9dc7a |
107 | sub is_valid { |
108 | |
109 | =pod |
110 | |
111 | =head2 is_valid |
112 | |
113 | Determine whether the constraint is valid or not. |
114 | |
115 | my $ok = $constraint->is_valid; |
116 | |
117 | =cut |
118 | |
119 | my $self = shift; |
120 | my $type = $self->type or return $self->error('No type'); |
121 | my $table = $self->table or return $self->error('No table'); |
122 | my @fields = $self->fields or return $self->error('No fields'); |
123 | my $table_name = $table->name or return $self->error('No table name'); |
124 | |
125 | for my $f ( @fields ) { |
126 | next if $table->get_field( $f ); |
127 | return $self->error( |
128 | "Constraint references non-existent field '$f' ", |
129 | "in table '$table_name'" |
130 | ); |
131 | } |
132 | |
133 | my $schema = $table->schema or return $self->error( |
134 | 'Table ', $table->name, ' has no schema object' |
135 | ); |
136 | |
137 | if ( $type eq FOREIGN_KEY ) { |
138 | return $self->error('Only one field allowed for foreign key') |
139 | if scalar @fields > 1; |
140 | |
ea93df61 |
141 | my $ref_table_name = $self->reference_table or |
43b9dc7a |
142 | return $self->error('No reference table'); |
143 | |
144 | my $ref_table = $schema->get_table( $ref_table_name ) or |
145 | return $self->error("No table named '$ref_table_name' in schema"); |
146 | |
147 | my @ref_fields = $self->reference_fields or return; |
148 | |
149 | return $self->error('Only one field allowed for foreign key reference') |
150 | if scalar @ref_fields > 1; |
151 | |
152 | for my $ref_field ( @ref_fields ) { |
153 | next if $ref_table->get_field( $ref_field ); |
154 | return $self->error( |
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155 | "Constraint from field(s) ". |
156 | join(', ', map {qq['$table_name.$_']} @fields). |
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157 | " to non-existent field '$ref_table_name.$ref_field'" |
158 | ); |
159 | } |
160 | } |
161 | elsif ( $type eq CHECK_C ) { |
ea93df61 |
162 | return $self->error('No expression for CHECK') unless |
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163 | $self->expression; |
164 | } |
165 | |
166 | return 1; |
167 | } |
168 | |
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169 | =head2 fields |
170 | |
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171 | Gets and set the fields the constraint is on. Accepts a string, list or |
172 | arrayref; returns an array or array reference. Will unique the field |
173 | names and keep them in order by the first occurrence of a field name. |
174 | |
ac095e5e |
175 | The fields are returned as Field objects if they exist or as plain |
176 | names if not. (If you just want the names and want to avoid the Field's overload |
177 | magic use L<field_names>). |
178 | |
179 | Returns undef or an empty list if the constraint has no fields set. |
180 | |
43b9dc7a |
181 | $constraint->fields('id'); |
182 | $constraint->fields('id', 'name'); |
183 | $constraint->fields( 'id, name' ); |
184 | $constraint->fields( [ 'id', 'name' ] ); |
185 | $constraint->fields( qw[ id name ] ); |
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186 | |
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187 | my @fields = $constraint->fields; |
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188 | |
189 | =cut |
190 | |
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191 | sub fields { |
192 | my $self = shift; |
193 | my $table = $self->table; |
194 | my @tables = map { $table->get_field($_) || $_ } @{$self->field_names(@_) || []}; |
195 | return wantarray ? @tables |
196 | : @tables ? \@tables |
197 | : undef; |
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198 | } |
199 | |
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200 | =head2 field_names |
201 | |
202 | Read-only method to return a list or array ref of the field names. Returns undef |
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203 | or an empty list if the constraint has no fields set. Useful if you want to |
ac095e5e |
204 | avoid the overload magic of the Field objects returned by the fields method. |
205 | |
206 | my @names = $constraint->field_names; |
207 | |
208 | =cut |
209 | |
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210 | with ListAttr field_names => ( uniq => 1, undef_if_empty => 1 ); |
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211 | |
212 | =head2 match_type |
213 | |
214 | Get or set the constraint's match_type. Only valid values are "full" |
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215 | "partial" and "simple" |
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216 | |
217 | my $match_type = $constraint->match_type('FULL'); |
218 | |
219 | =cut |
220 | |
96a5759e |
221 | has match_type => ( |
222 | is => 'rw', |
223 | default => sub { '' }, |
224 | coerce => sub { lc $_[0] }, |
225 | isa => sub { |
226 | my $arg = $_[0]; |
227 | throw("Invalid match type: $arg") |
228 | if $arg && !($arg eq 'full' || $arg eq 'partial' || $arg eq 'simple'); |
229 | }, |
230 | ); |
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231 | |
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232 | around match_type => \&ex2err; |
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233 | |
234 | =head2 name |
235 | |
236 | Get or set the constraint's name. |
237 | |
238 | my $name = $constraint->name('foo'); |
239 | |
240 | =cut |
241 | |
96a5759e |
242 | has name => ( is => 'rw', default => sub { '' } ); |
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243 | |
96a5759e |
244 | around name => sub { |
245 | my ($orig, $self, $arg) = @_; |
246 | $self->$orig($arg || ()); |
247 | }; |
dedb8f3b |
248 | |
249 | =head2 options |
250 | |
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251 | Gets or adds to the constraints's options (e.g., "INITIALLY IMMEDIATE"). |
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252 | Returns an array or array reference. |
253 | |
254 | $constraint->options('NORELY'); |
255 | my @options = $constraint->options; |
256 | |
257 | =cut |
258 | |
0fb58589 |
259 | with ListAttr options => (); |
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260 | |
261 | =head2 on_delete |
262 | |
263 | Get or set the constraint's "on delete" action. |
264 | |
265 | my $action = $constraint->on_delete('cascade'); |
266 | |
267 | =cut |
268 | |
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269 | has on_delete => ( is => 'rw', default => sub { '' } ); |
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270 | |
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271 | around on_delete => sub { |
272 | my ($orig, $self, $arg) = @_; |
273 | $self->$orig($arg || ()); |
274 | }; |
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275 | |
276 | =head2 on_update |
277 | |
278 | Get or set the constraint's "on update" action. |
279 | |
280 | my $action = $constraint->on_update('no action'); |
281 | |
282 | =cut |
283 | |
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284 | has on_update => ( is => 'rw', default => sub { '' } ); |
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285 | |
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286 | around on_update => sub { |
287 | my ($orig, $self, $arg) = @_; |
288 | $self->$orig($arg || ()); |
289 | }; |
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290 | |
291 | =head2 reference_fields |
292 | |
293 | Gets and set the fields in the referred table. Accepts a string, list or |
294 | arrayref; returns an array or array reference. |
295 | |
296 | $constraint->reference_fields('id'); |
297 | $constraint->reference_fields('id', 'name'); |
298 | $constraint->reference_fields( 'id, name' ); |
299 | $constraint->reference_fields( [ 'id', 'name' ] ); |
300 | $constraint->reference_fields( qw[ id name ] ); |
301 | |
302 | my @reference_fields = $constraint->reference_fields; |
303 | |
304 | =cut |
305 | |
0fb58589 |
306 | with ListAttr reference_fields => ( |
307 | may_throw => 1, |
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308 | builder => 1, |
309 | lazy => 1, |
310 | ); |
311 | |
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312 | sub _build_reference_fields { |
313 | my ($self) = @_; |
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314 | |
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315 | my $table = $self->table or throw('No table'); |
316 | my $schema = $table->schema or throw('No schema'); |
317 | if ( my $ref_table_name = $self->reference_table ) { |
318 | my $ref_table = $schema->get_table( $ref_table_name ) or |
319 | throw("Can't find table '$ref_table_name'"); |
320 | |
321 | if ( my $constraint = $ref_table->primary_key ) { |
322 | return [ $constraint->fields ]; |
323 | } |
324 | else { |
325 | throw( |
326 | 'No reference fields defined and cannot find primary key in ', |
327 | "reference table '$ref_table_name'" |
328 | ); |
329 | } |
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330 | } |
331 | } |
332 | |
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333 | =head2 reference_table |
334 | |
335 | Get or set the table referred to by the constraint. |
336 | |
337 | my $reference_table = $constraint->reference_table('foo'); |
338 | |
339 | =cut |
340 | |
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341 | has reference_table => ( is => 'rw', default => sub { '' } ); |
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342 | |
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343 | =head2 table |
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344 | |
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345 | Get or set the constraint's table object. |
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346 | |
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347 | my $table = $field->table; |
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348 | |
349 | =cut |
350 | |
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351 | has table => ( is => 'rw', isa => schema_obj('Table'), weak_ref => 1 ); |
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352 | |
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353 | around table => \&ex2err; |
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354 | |
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355 | =head2 type |
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356 | |
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357 | Get or set the constraint's type. |
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358 | |
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359 | my $type = $constraint->type( PRIMARY_KEY ); |
43b9dc7a |
360 | |
361 | =cut |
362 | |
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363 | has type => ( |
364 | is => 'rw', |
365 | default => sub { '' }, |
366 | isa => sub { |
367 | throw("Invalid constraint type: $_[0]") |
368 | if $_[0] && !$VALID_CONSTRAINT_TYPE{ $_[0] }; |
369 | }, |
370 | coerce => sub { (my $t = $_[0]) =~ s/_/ /g; uc $t }, |
371 | ); |
abf315bb |
372 | |
96a5759e |
373 | around type => \&ex2err; |
abf315bb |
374 | |
375 | =head2 equals |
376 | |
377 | Determines if this constraint is the same as another |
378 | |
379 | my $isIdentical = $constraint1->equals( $constraint2 ); |
380 | |
381 | =cut |
382 | |
96a5759e |
383 | around equals => sub { |
384 | my $orig = shift; |
abf315bb |
385 | my $self = shift; |
386 | my $other = shift; |
387 | my $case_insensitive = shift; |
d990d84b |
388 | my $ignore_constraint_names = shift; |
ea93df61 |
389 | |
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390 | return 0 unless $self->$orig($other); |
b8d24485 |
391 | return 0 unless $self->type eq $other->type; |
d990d84b |
392 | unless ($ignore_constraint_names) { |
393 | return 0 unless $case_insensitive ? uc($self->name) eq uc($other->name) : $self->name eq $other->name; |
394 | } |
abf315bb |
395 | return 0 unless $self->deferrable eq $other->deferrable; |
4598b71c |
396 | #return 0 unless $self->is_valid eq $other->is_valid; |
abf315bb |
397 | return 0 unless $case_insensitive ? uc($self->table->name) eq uc($other->table->name) |
ea93df61 |
398 | : $self->table->name eq $other->table->name; |
abf315bb |
399 | return 0 unless $self->expression eq $other->expression; |
ea93df61 |
400 | |
6a0f3000 |
401 | # Check fields, regardless of order |
ea93df61 |
402 | my %otherFields = (); # create a hash of the other fields |
6a0f3000 |
403 | foreach my $otherField ($other->fields) { |
ea93df61 |
404 | $otherField = uc($otherField) if $case_insensitive; |
405 | $otherFields{$otherField} = 1; |
6a0f3000 |
406 | } |
407 | foreach my $selfField ($self->fields) { # check for self fields in hash |
ea93df61 |
408 | $selfField = uc($selfField) if $case_insensitive; |
409 | return 0 unless $otherFields{$selfField}; |
410 | delete $otherFields{$selfField}; |
6a0f3000 |
411 | } |
412 | # Check all other fields were accounted for |
413 | return 0 unless keys %otherFields == 0; |
414 | |
415 | # Check reference fields, regardless of order |
ea93df61 |
416 | my %otherRefFields = (); # create a hash of the other reference fields |
6a0f3000 |
417 | foreach my $otherRefField ($other->reference_fields) { |
ea93df61 |
418 | $otherRefField = uc($otherRefField) if $case_insensitive; |
419 | $otherRefFields{$otherRefField} = 1; |
6a0f3000 |
420 | } |
421 | foreach my $selfRefField ($self->reference_fields) { # check for self reference fields in hash |
ea93df61 |
422 | $selfRefField = uc($selfRefField) if $case_insensitive; |
423 | return 0 unless $otherRefFields{$selfRefField}; |
424 | delete $otherRefFields{$selfRefField}; |
6a0f3000 |
425 | } |
426 | # Check all other reference fields were accounted for |
427 | return 0 unless keys %otherRefFields == 0; |
428 | |
b8d24485 |
429 | return 0 unless $case_insensitive ? uc($self->reference_table) eq uc($other->reference_table) : $self->reference_table eq $other->reference_table; |
abf315bb |
430 | return 0 unless $self->match_type eq $other->match_type; |
431 | return 0 unless $self->on_delete eq $other->on_delete; |
432 | return 0 unless $self->on_update eq $other->on_update; |
4598b71c |
433 | return 0 unless $self->_compare_objects(scalar $self->options, scalar $other->options); |
434 | return 0 unless $self->_compare_objects(scalar $self->extra, scalar $other->extra); |
abf315bb |
435 | return 1; |
96a5759e |
436 | }; |
abf315bb |
437 | |
96a5759e |
438 | # Must come after all 'has' declarations |
439 | around new => \&ex2err; |
440 | |
3c5de62a |
441 | 1; |
442 | |
3c5de62a |
443 | =pod |
444 | |
445 | =head1 AUTHOR |
446 | |
c3b0b535 |
447 | Ken Youens-Clark E<lt>kclark@cpan.orgE<gt>. |
3c5de62a |
448 | |
449 | =cut |