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7 | <title>DBIx::Class (aka DBIC)</title> |
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56 | </head> |
57 | <body> |
58 | |
59 | <div class="layout"> |
60 | <div id="controls"><!-- DO NOT EDIT --></div> |
61 | <div id="currentSlide"><!-- DO NOT EDIT --></div> |
62 | <div id="header"></div> |
63 | <div id="footer"> |
64 | <h1>DBIx::Class Introduction</h1> |
65 | <h2>YAPC::NA 2010</h2> |
66 | </div> |
67 | </div> |
68 | |
69 | <div class="presentation"> |
70 | |
71 | <div class="slide"> |
72 | <h1>DBIX::Class (aka DBIC)</h1> |
73 | <h3>for (advanced) beginners</h3> |
0cffcad7 |
74 | </div> |
75 | |
76 | <div class="slide"> |
77 | <h1>Authors</h1> |
78 | <h4>Originally Leo Lapworth @ LPW 2009</h4> |
79 | <h4>Matthew S. Trout</h4> |
0cffcad7 |
80 | <h4>Justin D. Hunter</h4> |
5cac74c7 |
81 | <h4>Arthur Axel "fREW" Schmidt</h4> |
52d980cb |
82 | </div> |
83 | |
84 | <div class="slide"> |
85 | <h1>assumptions</h1> |
86 | <p>You know a little about Perl and using objects</p> |
87 | <p>You know a little bit about databases and using foreign keys</p> |
0cffcad7 |
88 | <div class="notes"> |
89 | <ul> |
90 | <li>How many people have designed a database with Foreign Keys?</li> |
91 | <li>How many people have used any ORM?<ul> |
92 | <li>In Perl?<ul> |
93 | <li>DBIC?</li> |
94 | <li> Class::DBI? </li> |
95 | <li> Rose::DB? </li> |
96 | <li> Fey? </li> |
97 | <li> Others? </li> |
98 | </ul></li> |
99 | <li>AR? </li> |
100 | <li> DataMapper? </li> |
101 | <li>(N)Hibernate?</li> |
102 | </ul></li> |
103 | </ul> |
104 | </div> |
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105 | </div> |
106 | |
107 | <div class="slide"> |
108 | <h1>DBIx::Class?</h1> |
109 | <ul> |
110 | <li>ORM (object relational mapper)</li> |
111 | <li>SQL <-> OO (using objects instead of SQL)</li> |
112 | <li>Simple, powerful, complex, fab and confusing</li> |
113 | <li>There are many ORMs, DBIx::Class just happens to be the best in Perl (personal opinion)</li> |
114 | </ul> |
115 | </div> |
116 | |
117 | <div class="slide"> |
52d980cb |
118 | <h1>point of note</h1> |
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119 | <p><em>"Debugging is twice as hard as writing the code in the first |
120 | place. Therefore, if you write the code as cleverly as possible, |
121 | you are, by definition, not smart enough to debug it." - Brian |
122 | W. Kernighan</em></p> |
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123 | |
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124 | <p>This talk is about making it easy so we are less likely to get |
125 | confused</p> |
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126 | </div> |
127 | |
128 | <div class="slide"> |
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129 | <h1>Examples Table Setup</h1> |
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130 | <ul> |
131 | <li>Authors</li> |
132 | <li>Books</li> |
133 | </ul> |
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134 | <em>MySQL not recommended</em> |
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135 | </div> |
136 | |
137 | <div class="slide"> |
138 | <h1>authors table</h1> |
139 | <pre>CREATE TABLE authors( |
140 | id int(8) primary key auto_increment, |
141 | name varchar(255) |
142 | ) engine = InnoDB DEFAULT CHARSET=utf8;</pre> |
143 | </div> |
144 | |
145 | <div class="slide"> |
146 | <h1>tips</h1> |
147 | <p>Name tables as simple plurals (<strong>add an S</strong>) - makes relationships easier to understand</p> |
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148 | <p>Use a character set (<strong>UTF8</strong>) from the start (for international characters)</p> |
149 | </div> |
150 | |
151 | <div class="slide"> |
152 | <h1>authors table</h1> |
153 | <pre>CREATE TABLE author<strong>s</strong>( |
154 | id int(8) primary key auto_increment, |
155 | name varchar(255) |
156 | ) engine = <strong>InnoDB</strong> DEFAULT CHARSET=<strong>utf8</strong>;</pre> |
157 | </div> |
158 | |
159 | <div class="slide"> |
160 | <h1>books table</h1> |
161 | <pre>CREATE TABLE books( |
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162 | id int(8) primary key auto_increment, |
163 | title varchar(255), |
164 | author_id int(8),foreign key (author) |
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165 | references authors(id) |
166 | ) engine = InnoDB DEFAULT CHARSET=utf8;</pre> |
167 | </div> |
168 | |
169 | |
170 | <div class="slide"> |
171 | <h1>tips</h1> |
172 | <p>Name link fields as singular</p> |
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173 | <p>Ensure foreign key is the same type and size in both tables</p> |
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174 | </div> |
175 | |
176 | <div class="slide"> |
177 | <h1>books table</h1> |
178 | <pre>CREATE TABLE books( |
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179 | id int(8) primary key auto_increment, |
180 | title varchar(255), |
181 | author_id <strong>int(8)</strong>,<strong>foreign key (<em>author</em>)</strong> |
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182 | <strong>references <em>authors(id)</em></strong> |
183 | ) engine = InnoDB DEFAULT CHARSET=utf8;</pre> |
184 | </div> |
185 | |
186 | <div class="slide"> |
187 | <h1>CRUD compared</h1> |
188 | <ul> |
189 | <li><strong>C</strong> - Create</li> |
190 | <li><strong>R</strong> - Read</li> |
191 | <li><strong>U</strong> - Update</li> |
192 | <li><strong>D</strong> - Delete</li> |
193 | </ul> |
194 | </div> |
195 | |
196 | <div class="slide"> |
197 | <h1>Manual (SQL)</h1> |
198 | </div> |
199 | |
200 | <div class="slide"> |
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201 | <h1>SQL: Create</h1> |
52d980cb |
202 | <pre>my $sth = $dbh->prepare(' |
203 | INSERT INTO books |
204 | (title, author) |
205 | values (?,?) |
206 | '); |
207 | |
208 | $sth->execute( |
209 | 'A book title', $author_id |
210 | );</pre> |
211 | </div> |
212 | |
213 | <div class="slide"> |
5cac74c7 |
214 | <h1>SQL: Read</h1> |
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215 | <pre>my $sth = $dbh->prepare(' |
216 | SELECT title, |
217 | authors.name as author_name |
218 | FROM books, authors |
219 | WHERE books.author = authors.id |
220 | ');</pre> |
221 | </div> |
222 | |
223 | <div class="slide"> |
5cac74c7 |
224 | <h1>SQL: Read</h1> |
52d980cb |
225 | <pre>while( my $book = $sth->fetchrow_hashref() ) { |
226 | print 'Author of ' |
227 | . $book->{title} |
228 | . ' is ' |
229 | . $book->{author_name} |
230 | . "\n"; |
231 | }</pre> |
232 | </div> |
233 | |
234 | <div class="slide"> |
5cac74c7 |
235 | <h1>SQL: Update</h1> |
52d980cb |
236 | <pre>my $update = $dbh->prepare(' |
237 | UPDATE books |
238 | SET title = ? |
239 | WHERE id = ? |
240 | '); |
241 | |
242 | $update->execute( |
243 | 'New title',<strong>$book_id</strong> |
244 | );</pre> |
245 | </div> |
246 | |
247 | <div class="slide"> |
5cac74c7 |
248 | <h1>SQL: Delete</h1> |
52d980cb |
249 | <pre>my $delete = $dbh->prepare(' |
250 | DELETE FROM books |
251 | WHERE id = ? |
252 | '); |
253 | |
254 | $delete->execute(<strong>$book_id</strong>);</pre> |
255 | </div> |
256 | |
257 | <div class="slide"> |
258 | <h1>DBIx::Class</h1> |
259 | </div> |
260 | |
261 | <div class="slide"> |
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262 | <h1>DBIC: Create</h1> |
52d980cb |
263 | <pre>my $book = $book_model->create({ |
264 | title => 'A book title', |
265 | author => $author_id, |
266 | });</pre> |
267 | <p>Look ma, no SQL!</p> |
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268 | </div> |
269 | |
270 | <div class="slide"> |
5cac74c7 |
271 | <h1>DBIC: Create</h1> |
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272 | <pre>my $pratchett = $author_model->create({ |
273 | name => 'Terry Pratchett', |
274 | });</pre> |
275 | </div> |
276 | |
277 | <div class="slide"> |
5cac74c7 |
278 | <h1>DBIC: Create</h1> |
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279 | <pre>my $book = $pratchett->create_related( |
280 | <strong>books</strong> => { |
281 | title => 'Another Discworld book', |
282 | });</pre> |
283 | <strong>or</strong> |
284 | <pre>my $book = $pratchett->add_to_<strong>books</strong>({ |
285 | title => 'Another Discworld book', |
286 | });</pre> |
287 | </div> |
288 | |
289 | <div class="slide"> |
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290 | <h1>DBIC: Read</h1> |
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291 | <p>DBIx::Class - Lots of ways to do the same thing...</p> |
292 | <p><em>"There is more than one way to do it (TIMTOWTDI, usually pronounced "Tim Toady") is a Perl motto"</em></p> |
293 | </div> |
294 | |
295 | <div class="slide"> |
5cac74c7 |
296 | <h1>DBIC: Read</h1> |
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297 | <pre>my $book = $book_model->find($book_id); |
298 | |
299 | my $book = $book_model->search({ |
300 | title => 'A book title', |
5cac74c7 |
301 | }, { rows => 1 })->single; |
52d980cb |
302 | |
303 | my @books = $book_model->search({ |
304 | author => $author_id, |
305 | })->all;</pre> |
306 | </div> |
307 | |
308 | <div class="slide"> |
5cac74c7 |
309 | <h1>DBIC: Read</h1> |
310 | <pre>while( my $book = $books_rs->next ) { |
52d980cb |
311 | print 'Author of ' |
312 | . $book->title |
313 | . ' is ' |
314 | . $book->author->name |
315 | . "\n"; |
316 | }</pre> |
317 | </div> |
318 | |
319 | <div class="slide"> |
5cac74c7 |
320 | <h1>DBIC: Read</h1> |
321 | <pre>my $books_rs = $book_rs->search({ |
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322 | author => $author_id, |
323 | });</pre> |
324 | <p>Search takes SQL::Abstract formatted queries</p> |
325 | <pre>> perldoc SQL::Abstract</p> |
326 | </div> |
327 | |
328 | <div class="slide"> |
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329 | <h1>DBIC: Update</h1> |
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330 | <pre>$book->update({ |
331 | title => 'New title', |
332 | });</pre> |
333 | </div> |
334 | |
335 | <div class="slide"> |
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336 | <h1>DBIC: Delete</h1> |
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337 | <pre>$book->delete;</pre> |
338 | </div> |
339 | |
340 | <div class="slide"> |
341 | <h1>Creating models</h1> |
342 | </div> |
343 | |
344 | <div class="slide"> |
451b57c2 |
345 | <pre>package Foo::Schema::Result::Author; |
492be2ae |
346 | use strict; use warnings; |
347 | __PACKAGE__->table('authors'); |
348 | __PACKAGE__->add_columns( |
349 | id => { |
350 | data_type => 'int', |
351 | size => 8, |
352 | }, |
353 | title => { |
354 | data_type => 'varchar', |
355 | is_nullable => 1, |
356 | size => 255, |
357 | }, |
358 | ); |
359 | __PACKAGE__->set_primary_key('id'); |
360 | __PACKAGE__->has_many( books => |
451b57c2 |
361 | 'Foo::Schema::Result::Book', 'author_id' |
492be2ae |
362 | ); |
363 | 1; |
364 | </pre> |
365 | </div> |
366 | |
367 | <div class="slide"> |
451b57c2 |
368 | <pre>package Foo::Schema::Result::Book; |
492be2ae |
369 | use strict; use warnings; |
370 | __PACKAGE__->table('books'); |
371 | __PACKAGE__->add_columns( |
372 | id => { |
373 | data_type => 'int', |
374 | size => 8, |
375 | }, |
376 | name => { |
377 | data_type => 'varchar', |
378 | is_nullable => 1, |
379 | size => 255, |
380 | }, |
381 | author_id => { |
382 | data_type => 'int', |
383 | size => 8, |
384 | is_nullable => 1, # <-- probably should be 0 |
385 | }, |
386 | ); |
387 | __PACKAGE__->set_primary_key('id'); |
388 | __PACKAGE__->belongs_to( author => |
451b57c2 |
389 | 'Foo::Schema::Result::Author', 'author_id' |
492be2ae |
390 | ); |
391 | 1; |
392 | </pre> |
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393 | </div> |
394 | |
395 | <div class="slide"> |
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396 | <h1>Schema::Loader</h1> |
c7321880 |
397 | <p>DB -> Perl vs Perl -> DB</p> |
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398 | <pre>package Foo::Schema; |
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399 | use strict; use warnings; |
400 | use base 'DBIx::Class::Schema::Loader'; |
401 | __PACKAGE__->loader_options({ |
402 | naming => 'v7', |
403 | debug => $ENV{DBIC_TRACE}, |
404 | }); |
405 | 1; |
406 | |
407 | # elsewhere... |
408 | |
451b57c2 |
409 | my $schema = Foo::Schema->connect($dsn, $user, $pass); |
c7321880 |
410 | </pre> |
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411 | </div> |
412 | |
413 | <div class="slide"> |
6e5edefe |
414 | <h1>Splitting Logic Cleanly</h1> |
451b57c2 |
415 | <p>Foo::Schema::Result::Bar = individual row</p> |
416 | <p>Foo::Schema::ResultSet::Bar = searches / table </p> |
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417 | </div> |
418 | |
419 | <div class="slide"> |
6e5edefe |
420 | <h1>Using your Schema</h1> |
421 | <pre>#!perl |
422 | use strict; use warnings; |
423 | use lib 'lib'; |
451b57c2 |
424 | use Foo::Schema; |
425 | my $schema = Foo::Schema->connect($dns, $user, $pass); |
6e5edefe |
426 | my $author_rs = $schema->resultset('Author'); |
427 | my $author = $author_rs->create({ |
428 | name => 'Douglas Adams', |
429 | }); |
430 | my $book = $author->add_to_books({ |
431 | title => '42', |
432 | }); |
433 | </pre> |
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434 | </div> |
435 | |
436 | <div class="slide"> |
437 | <h1>DEBUGGING</h1> |
438 | <pre>DBIC_TRACE=1 ./your_script.pl</pre> |
439 | </div> |
440 | |
441 | <div class="slide"> |
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442 | <h1>SQL - debugging</h1> |
443 | <pre>INSERT INTO authors (name) |
444 | VALUES (?): 'Douglas Adams' |
445 | |
446 | INSERT INTO books (author, title) |
447 | VALUES (?, ?): '5', '42'</pre> |
448 | </div> |
449 | |
450 | <div class="slide"> |
451 | <h1>overloading</h1> |
451b57c2 |
452 | <pre>Foo::Schema::Result::Book |
453 | Foo::Schema::ResultSet::Book |
454 | Foo::Schema::Result::Author |
455 | Foo::Schema::ResultSet::Book</pre> |
52d980cb |
456 | </div> |
457 | |
458 | <div class="slide"> |
459 | <h1>Result::</h1> |
2a65778d |
460 | <pre>package Foo::Schema::Result::Book; |
461 | use base 'DBIx::Class::Core'; |
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462 | use strict; |
463 | use warnings; |
464 | |
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465 | # Result code here |
466 | |
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467 | sub isbn { |
468 | my $self = shift; |
469 | |
470 | # search amazon or something |
471 | my $api = Amazon::API->book({ |
472 | title => $self->title |
473 | }); |
474 | |
475 | return $api->isbn; |
476 | } |
477 | |
478 | 1;</pre> |
479 | </div> |
480 | |
481 | <div class="slide"> |
482 | <h1>Result::</h1> |
483 | <pre>print $book->isbn;</pre> |
484 | </div> |
485 | |
486 | <div class="slide"> |
487 | <h1>Result:: (inflating)</h1> |
2a65778d |
488 | <pre>package Foo::Schema::Result::Book; |
489 | use base 'DBIx::Class::Core'; |
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490 | use strict; |
491 | use warnings; |
492 | |
451b57c2 |
493 | # Result code here |
494 | |
495 | __PACKAGE__->load_components('InflateColumn'); |
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496 | use DateTime::Format::MySQL; |
497 | |
498 | __PACKAGE__-><strong>inflate_column</strong>( |
499 | <strong>date_published</strong> => { |
500 | inflate => sub { DateTime::Format::MySQL->parse_date(shift) }, |
501 | deflate => sub { shift->ymd}, |
451b57c2 |
502 | }, |
52d980cb |
503 | ); |
504 | # Automatic see: DBIx::Class::InflateColumn::DateTime</pre> |
505 | </div> |
506 | |
507 | <div class="slide"> |
52d980cb |
508 | <h1>Result:: (deflating)</h1> |
509 | <pre>$book->date_published(DateTime->now); |
510 | $book->update;</pre> |
511 | </div> |
512 | |
513 | <div class="slide"> |
514 | <h1>Result:: (inflating)</h1> |
515 | <pre>my $date_published = $book->date_published; |
516 | print $date_published->month_abbr;</pre> |
517 | |
518 | <strong><em>Nov</em></strong> |
519 | </div> |
520 | |
521 | <div class="slide"> |
522 | <h1>ResultSets::</h1> |
41a0eb8e |
523 | <pre>package Foo::Schema::ResultSet::Books; |
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524 | use base 'DBIx::Class::ResultSet'; |
525 | sub the_ultimate_books { |
526 | my $self = shift; |
527 | return $self->search({ title => { -like => '%42%' } }); |
528 | } |
529 | sub by_author { |
530 | my ( $self, $author ) = @_; |
531 | return $self->search({ author => $author->id }) |
532 | } |
533 | |
534 | 1;</pre> |
535 | </div> |
536 | |
537 | <div class="slide"> |
538 | <h1>ResultSets::</h1> |
41a0eb8e |
539 | <pre>use Foo::Schema; |
451b57c2 |
540 | my $schema = Foo::Schema->connect(...); |
541 | my $book_rs = Foo::Schema->resultset('Book'); |
542 | my $book_search = $book_rs->the_ultimate_books; |
543 | my @books = $book_search->all;</pre> |
52d980cb |
544 | </div> |
545 | |
546 | <div class="slide"> |
451b57c2 |
547 | <h1>ResultSets: Chaining</h1> |
548 | <pre> |
549 | my $book_rs = $schema->resultset('Book'); |
550 | my $author_rs = $schema->resultset('Author'); |
52d980cb |
551 | my $author = $author_model->search({ name => 'Douglas Adams' })->single; |
552 | my $book_rs = $book_model->the_ultimate_books->by_author($author); |
553 | my @books = $book_rs->all;</pre> |
554 | </div> |
555 | |
556 | <div class="slide"> |
451b57c2 |
557 | <h1>ResultSets: Chaining</h1> |
558 | <pre>$book_rs = $schema->resultset('Book') |
52d980cb |
559 | ->the_ultimate_books |
560 | ->by_author($author);</pre> |
561 | or |
562 | |
451b57c2 |
563 | <pre>my $book_rs = $schema->resultset('Book') |
2a65778d |
564 | ->the_ultimate_books; |
52d980cb |
565 | $book_rs = $book_rs->by_author($author);</pre> |
566 | <pre># Debug (SQL): |
567 | |
568 | # SELECT me.id, me.title, me.date_published, me.author |
569 | # FROM books me |
570 | # WHERE ( ( ( author = ? ) AND ( title LIKE ? ) ) ): '5', '%42%' |
571 | # WHERE ( ( ( author = ? ) AND ( title LIKE ? ) ) ): '5', '%42%'</pre> |
572 | </div> |
573 | |
574 | <div class="slide"> |
575 | <h1>ResultSets::chaining</h1> |
576 | <pre>my $rs = $book_model |
577 | ->category('childrens') |
578 | ->by_author($author) |
579 | ->published_after('1812') |
580 | ->first_page_contains('once upon') |
581 | ->rating_greater_than(4); |
582 | |
583 | my @books = $rs->all;</pre> |
584 | </div> |
585 | |
586 | <div class="slide"> |
587 | <h1>overloading before new record</h1> |
2a65778d |
588 | <pre>package Foo::Schema::Result::Author; |
589 | use base 'DBIx::Class::Core'; |
52d980cb |
590 | |
591 | sub new { |
592 | my ( $class, $attrs ) = @_; |
593 | # Mess with $attrs |
594 | my $new = $class->next::method($attrs); |
595 | return $new |
596 | } |
597 | |
598 | 1;</pre> |
599 | |
600 | <div class="slide"> |
6548782a |
601 | <h1>Relationships</h1> |
52d980cb |
602 | </div> |
603 | |
604 | <div class="slide"> |
6548782a |
605 | <h1>Multiple Authors</h1> |
52d980cb |
606 | </div> |
607 | |
608 | <div class="slide"> |
609 | <h1>a few relationships</h1> |
6548782a |
610 | (really need picture here) |
52d980cb |
611 | (authors -- author_link_to_book -- books) |
612 | </div> |
613 | |
614 | <div class="slide"> |
6548782a |
615 | <h1>Join Table</h1> |
52d980cb |
616 | <pre>CREATE TABLE author_and_books( |
6548782a |
617 | book_id int(8), |
618 | author_id int(8), |
619 | foreign key (book_id) references books(id), |
620 | foreign key (author_id) references authors(id) |
52d980cb |
621 | ) engine = InnoDB DEFAULT CHARSET=utf8; |
622 | |
6548782a |
623 | ALTER TABLE `books` DROP `author`;</pre> |
52d980cb |
624 | </div> |
625 | |
626 | <div class="slide"> |
627 | <h1>has_many</h1> |
628 | </div> |
629 | |
630 | <div class="slide"> |
631 | <h1>has_many</h1> |
6548782a |
632 | <pre>package Foo::Schema::<strong>Result::Book</strong>; |
52d980cb |
633 | |
6548782a |
634 | __PACKAGE__->has_many( author_and_books => |
635 | 'Foo::Schema::Result::Author_Book', 'book_id' |
52d980cb |
636 | ); |
52d980cb |
637 | </div> |
638 | |
639 | <div class="slide"> |
640 | <h1>belongs_to</h1> |
641 | </div> |
642 | |
643 | <div class="slide"> |
644 | <h1>belongs_to</h1> |
6548782a |
645 | <pre>package Foo::Schema::<strong>Result::Author_Book</strong>; |
52d980cb |
646 | |
647 | __PACKAGE__->belongs_to( |
6548782a |
648 | book => |
649 | 'Foo::Schema::Result::Book', 'book_id' |
52d980cb |
650 | ); |
651 | </pre> |
652 | </div> |
653 | |
654 | <div class="slide"> |
655 | <h1>same for Authors</h1> |
656 | </div> |
657 | |
658 | <div class="slide"> |
52d980cb |
659 | <h1>many_to_many</h1> |
660 | </div> |
661 | |
662 | <div class="slide"> |
663 | <h1>many_to_many</h1> |
2a65778d |
664 | <pre>package Foo::Schema::<strong>Result::Book</strong>; |
665 | use base 'DBIx::Class::Core'; |
52d980cb |
666 | |
667 | __PACKAGE__->many_to_many( |
6548782a |
668 | authors => 'author_and_books', 'author' |
52d980cb |
669 | ); |
670 | |
671 | 1; |
6548782a |
672 | </pre> |
52d980cb |
673 | </div> |
674 | |
675 | <div class="slide"> |
676 | <h1>many_to_many</h1> |
2a65778d |
677 | <pre>package Foo::Schema::<strong>Result::Book</strong>; |
678 | use base 'DBIx::Class::Core'; |
52d980cb |
679 | |
680 | __PACKAGE__->many_to_many( |
681 | authors <strong># Accessor name</strong> |
682 | => "author_and_books", <strong># has_many</strong> |
683 | 'author' <strong># foreign relationship name</strong> |
684 | ); |
685 | |
686 | 1;</pre> |
687 | </div> |
688 | |
689 | <div class="slide"> |
690 | <h1>many_to_many</h1> |
2a65778d |
691 | <pre>package Foo::Schema::Result::Author; |
692 | use base 'DBIx::Class::Core'; |
52d980cb |
693 | |
694 | __PACKAGE__->many_to_many( |
695 | "books" <strong># Accessor Name</strong> |
696 | => "author_and_books", <strong># has_many accessor_name</strong> |
697 | 'book' <strong># foreign relationship name</strong> |
698 | ); |
699 | |
700 | 1; |
6548782a |
701 | </pre> |
52d980cb |
702 | </div> |
703 | |
704 | <div class="slide"> |
705 | <h1>using many_to_many</h1> |
706 | <pre>#!/usr/bin/perl |
707 | |
41a0eb8e |
708 | use Foo::Schema; |
52d980cb |
709 | |
41a0eb8e |
710 | my $author_model = Foo::Schema->resultset('Authors'); |
52d980cb |
711 | my $author = $author_model->search({ |
712 | name => 'Douglas Adams', |
713 | })->single; |
714 | $author->add_to_books({ |
715 | title => 'A new book', |
716 | });</pre> |
717 | </div> |
718 | |
719 | <div class="slide"> |
720 | <h1>using many_to_many</h1> |
721 | <pre>my $author = $author_model->search({ |
722 | name => 'Douglas Adams', |
723 | })->single; |
724 | <strong>$author->add_to_books({ |
725 | title => 'A new book', |
726 | });</strong> |
727 | |
728 | # SELECT me.id, me.name FROM authors me |
729 | # WHERE ( name = ? ): 'Douglas Adams'; |
730 | # INSERT INTO books (title) VALUES (?): 'A new book'; |
731 | # INSERT INTO author_and_books (author, book) |
732 | # VALUES (?, ?): '5', '2';</pre> |
733 | </div> |
734 | |
735 | <div class="slide"> |
736 | <h1>using many_to_many</h1> |
737 | <pre>$author->add_to_books($book); |
738 | |
739 | $book->add_to_authors($author_1); |
740 | $book->add_to_authors($author_2);</pre> |
741 | </div> |
742 | |
743 | <div class="slide"> |
744 | <h1>in 16 lines of code</h1> |
745 | </div> |
746 | |
747 | <div class="slide"> |
748 | <h1>errors</h1> |
749 | <p>Read them closely!</p> |
750 | </div> |
751 | |
752 | <div class="slide"> |
753 | <h1>error messages</h1> |
41a0eb8e |
754 | <pre>DBIx::Class::Schema::Loader::connection(): Failed to load external class definition for 'Foo::Schema::Result::Authors': Can't locate object method "many_to_many" via package "Foo::Schema::Result::Author" at lib/Foo/Schema/Result/Authors.pm line 9.Compilation failed in require at /Library/Perl/5.8.8/DBIx/Class/Schema/Loader/Base.pm line 292.</pre> |
52d980cb |
755 | </div> |
756 | |
757 | <div class="slide"> |
758 | <h1>error messages</h1> |
41a0eb8e |
759 | <pre>DBIx::Class::Schema::Loader::connection(): Failed to load external class definition for 'Foo::Schema::Result::Authors': Can't locate object method "many_to_many" via package "Foo::Schema::<strong>Result::Author</strong>" at lib/Foo/Schema/<strong>Result/Authors.pm</strong> line 9.Compilation failed in require at /Library/Perl/5.8.8/DBIx/Class/Schema/Loader/Base.pm line 292.</pre> |
52d980cb |
760 | </div> |
761 | |
762 | <div class="slide"> |
763 | <h1>errors</h1> |
764 | <ul> |
765 | <li>Turn on debugging</li> |
766 | <li>Read error messages (sometimes useful!)</li> |
767 | <li>Check field names</li> |
768 | <li>Check package names</li> |
769 | <li>Check which database you are connected to (dev/test/live?) - repeat above</li> |
770 | </ul> |
771 | </div> |
772 | |
773 | <div class="slide"> |
774 | <h1>bonus slides!</h1> |
775 | </div> |
776 | |
777 | <div class="slide"> |
778 | <h1>Template Toolkit</h1> |
779 | <ul> |
780 | <li><pre>[% author.books.count %]</pre> not working?</li> |
781 | <li>TT all methods are called in list context</li> |
782 | <li><pre>[% author.books<strong>_rs</strong>.count %]</pre> scalar context</li> |
783 | <li><em>Available for all relationships</em></li> |
784 | </ul> |
785 | </div> |
786 | |
787 | <div class="slide"> |
788 | <h1>Catalyst</h1> |
0cffcad7 |
789 | <pre>package Your::App::Model::<strong>Foo</strong>; |
41a0eb8e |
790 | use base qw(<strong>Catalyst::Model::Schema::Schema</strong>); |
52d980cb |
791 | |
792 | use strict; |
793 | use warnings; |
794 | |
795 | __PACKAGE__->config( |
41a0eb8e |
796 | schema_class => '<strong>Foo::Schema</strong>', |
52d980cb |
797 | ); |
798 | |
799 | 1;</pre> |
800 | <p>Keep your Schema in a <em>separate</em> package to your Catalyst application</p> |
801 | </div> |
802 | |
803 | <div class="slide"> |
804 | <h1>Catalyst</h1> |
805 | <pre>sub action_name : Local { |
806 | my ($self, $c) = @_; |
807 | |
41a0eb8e |
808 | my $model = $c->model('Schema::Foo'); |
52d980cb |
809 | my $author_model = $model->resultset('Authors'); |
810 | |
811 | } |
812 | |
813 | 1;</pre> |
814 | </div> |
815 | |
816 | </div> |
817 | </body> |
818 | </html> |