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7 | <title>DBIx::Class (aka DBIC)</title> |
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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> |
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80 | <h4>Justin D. Hunter</h4> |
5cac74c7 |
81 | <h4>Arthur Axel "fREW" Schmidt</h4> |
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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> |
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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"> |
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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> |
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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"> |
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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"> |
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224 | <h1>SQL: Read</h1> |
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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"> |
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235 | <h1>SQL: Update</h1> |
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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"> |
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248 | <h1>SQL: Delete</h1> |
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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> |
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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"> |
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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"> |
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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"> |
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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', |
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301 | }, { rows => 1 })->single; |
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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 ) { |
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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"> |
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345 | <pre>package MyApp::Schema::Result::Author; |
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 => |
361 | 'MyApp::Schema::Result::Book', 'author_id' |
362 | ); |
363 | 1; |
364 | </pre> |
365 | </div> |
366 | |
367 | <div class="slide"> |
368 | <pre>package MyApp::Schema::Result::Book; |
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 => |
389 | 'MyApp::Schema::Result::Author', 'author_id' |
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> |
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397 | <p>DB -> Perl vs Perl -> DB</p> |
398 | <pre>package MyApp::Schema; |
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 | |
409 | my $schema = MyApp::Schema->connect($dsn, $user, $pass); |
410 | </pre> |
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411 | </div> |
412 | |
413 | <div class="slide"> |
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414 | <h1>Splitting Logic Cleanly</h1> |
415 | <p>MyApp::Schema::Result::Foo = individual row</p> |
416 | <p>MyApp::Schema::ResultSet::Foo = searches / table </p> |
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417 | </div> |
418 | |
419 | <div class="slide"> |
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420 | <h1>Using your Schema</h1> |
421 | <pre>#!perl |
422 | use strict; use warnings; |
423 | use lib 'lib'; |
424 | use MyApp::Schema; |
425 | my $schema = MyApp::Schema->connect($dns, $user, $pass); |
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> |
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452 | <pre>MyApp::Schema::Result::Book |
453 | MyApp::Schema::ResultSet::Book |
454 | MyApp::Schema::Result::Author |
455 | MyApp::Schema::ResultSet::Book</pre> |
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456 | </div> |
457 | |
458 | <div class="slide"> |
459 | <h1>Result::</h1> |
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460 | <pre>package Foo::Schema::Result::Books; |
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461 | use base 'DBIx::Class'; |
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 $book->isbn;</pre> |
484 | </div> |
485 | |
486 | <div class="slide"> |
487 | <h1>Result:: (inflating)</h1> |
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488 | <pre>package Foo::Schema::Result::Books; |
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489 | use base 'DBIx::Class'; |
490 | use strict; |
491 | use warnings; |
492 | |
493 | use DateTime::Format::MySQL; |
494 | |
495 | __PACKAGE__-><strong>inflate_column</strong>( |
496 | <strong>date_published</strong> => { |
497 | inflate => sub { DateTime::Format::MySQL->parse_date(shift) }, |
498 | deflate => sub { shift->ymd}, |
499 | } |
500 | ); |
501 | # Automatic see: DBIx::Class::InflateColumn::DateTime</pre> |
502 | </div> |
503 | |
504 | <div class="slide"> |
505 | <h1>Result:: (inflating)</h1> |
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506 | <pre>package Foo::Schema::Result::Books; |
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507 | use base 'DBIx::Class'; |
508 | use strict; |
509 | use warnings; |
510 | |
511 | use DateTime::Format::MySQL; |
512 | |
513 | __PACKAGE__->inflate_column( |
514 | date_published => { |
515 | <strong>inflate => sub { DateTime::Format::MySQL->parse_date(shift) }, |
516 | deflate => sub { shift->ymd},</strong> |
517 | } |
518 | ); |
519 | # Automatic see: DBIx::Class::InflateColumn::DateTime |
520 | # Automatic see: DBIx::Class::InflateColumn::DateTime |
521 | # Automatic see: DBIx::Class::InflateColumn::DateTime</pre> |
522 | </div> |
523 | |
524 | <div class="slide"> |
525 | <h1>Result:: (deflating)</h1> |
526 | <pre>$book->date_published(DateTime->now); |
527 | $book->update;</pre> |
528 | </div> |
529 | |
530 | <div class="slide"> |
531 | <h1>Result:: (inflating)</h1> |
532 | <pre>my $date_published = $book->date_published; |
533 | print $date_published->month_abbr;</pre> |
534 | |
535 | <strong><em>Nov</em></strong> |
536 | </div> |
537 | |
538 | <div class="slide"> |
539 | <h1>ResultSets::</h1> |
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540 | <pre>package Foo::Schema::ResultSet::Books; |
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541 | use base 'DBIx::Class::ResultSet'; |
542 | sub the_ultimate_books { |
543 | my $self = shift; |
544 | return $self->search({ title => { -like => '%42%' } }); |
545 | } |
546 | sub by_author { |
547 | my ( $self, $author ) = @_; |
548 | return $self->search({ author => $author->id }) |
549 | } |
550 | |
551 | 1;</pre> |
552 | </div> |
553 | |
554 | <div class="slide"> |
555 | <h1>ResultSets::</h1> |
41a0eb8e |
556 | <pre>package Foo::Schema::<strong>ResultSet::Books</strong>; |
52d980cb |
557 | use base '<strong>DBIx::Class::ResultSet</strong>'; |
558 | sub the_ultimate_books { |
559 | my $self = shift; |
560 | <strong>return $self->search({ title => { -like => '%42%' } })</strong> |
561 | } |
562 | sub by_author { |
563 | my ( $self, $author ) = @_; |
564 | return $self->search({ author => $author->id }) |
565 | } |
566 | |
567 | 1;</pre> |
568 | </div> |
569 | |
570 | <div class="slide"> |
571 | <h1>ResultSets::</h1> |
41a0eb8e |
572 | <pre>package Foo::Schema::ResultSet::Books; |
52d980cb |
573 | use base 'DBIx::Class::ResultSet'; |
574 | sub the_ultimate_books { |
575 | my $self = shift; |
576 | return $self->search({ title => { -like => '%42%' } }); |
577 | } |
578 | sub by_author { |
579 | my ( $self, $author ) = @_; |
580 | <strong>return $self->search({ author => $author->id })</strong> |
581 | } |
582 | |
583 | 1;</pre> |
584 | </div> |
585 | |
586 | <div class="slide"> |
587 | <h1>ResultSets::</h1> |
41a0eb8e |
588 | <pre>use Foo::Schema; |
589 | my $book_model = Foo::Schema->resultset('Books'); |
52d980cb |
590 | my $book_rs = $book_model->the_ultimate_books; |
591 | my @books = $book_rs->all;</pre> |
592 | </div> |
593 | |
594 | <div class="slide"> |
595 | <h1>ResultSets::chaining</h1> |
41a0eb8e |
596 | <pre>use Foo::Schema; |
597 | my $book_model = Foo::Schema->resultset('Books'); |
598 | my $author_model = Foo::Schema->resultset('Authors'); |
52d980cb |
599 | my $author = $author_model->search({ name => 'Douglas Adams' })->single; |
600 | my $book_rs = $book_model->the_ultimate_books->by_author($author); |
601 | my @books = $book_rs->all;</pre> |
602 | </div> |
603 | |
604 | <div class="slide"> |
605 | <h1>ResultSets::chaining</h1> |
606 | <pre>my $book_rs = $book_model |
607 | ->the_ultimate_books |
608 | ->by_author($author);</pre> |
609 | or |
610 | |
611 | <pre>my $book_rs = $book_model |
612 | ->the_ultimate_books(); |
613 | $book_rs = $book_rs->by_author($author);</pre> |
614 | <pre># Debug (SQL): |
615 | |
616 | # SELECT me.id, me.title, me.date_published, me.author |
617 | # FROM books me |
618 | # WHERE ( ( ( author = ? ) AND ( title LIKE ? ) ) ): '5', '%42%' |
619 | # WHERE ( ( ( author = ? ) AND ( title LIKE ? ) ) ): '5', '%42%'</pre> |
620 | </div> |
621 | |
622 | <div class="slide"> |
623 | <h1>ResultSets::chaining</h1> |
624 | <pre>my $rs = $book_model |
625 | ->category('childrens') |
626 | ->by_author($author) |
627 | ->published_after('1812') |
628 | ->first_page_contains('once upon') |
629 | ->rating_greater_than(4); |
630 | |
631 | my @books = $rs->all;</pre> |
632 | </div> |
633 | |
634 | <div class="slide"> |
635 | <h1>overloading before new record</h1> |
636 | </div> |
637 | |
638 | <div class="slide"> |
639 | <h1>overloading before new record</h1> |
41a0eb8e |
640 | <pre>package Foo::Schema::Result::Authors; |
52d980cb |
641 | use base 'DBIx::Class'; |
642 | |
643 | sub new { |
644 | my ( $class, $attrs ) = @_; |
645 | # Mess with $attrs |
646 | my $new = $class->next::method($attrs); |
647 | return $new |
648 | } |
649 | |
650 | 1;</pre> |
651 | |
652 | <div class="slide"> |
653 | <h1>relationships</h1> |
654 | </div> |
655 | |
656 | <div class="slide"> |
657 | <h1>multiple authors</h1> |
658 | </div> |
659 | |
660 | <div class="slide"> |
661 | <h1>a few relationships</h1> |
662 | (authors -- author_link_to_book -- books) |
663 | </div> |
664 | |
665 | <div class="slide"> |
666 | <h1>a few relationships</h1> |
667 | ! |
668 | </div> |
669 | |
670 | <div class="slide"> |
671 | <h1>new join table</h1> |
672 | <pre>CREATE TABLE author_and_books( |
673 | id int(8) primary key auto_increment, |
674 | book int(8), |
675 | author int(8), |
676 | foreign key (book) references books(id), |
677 | foreign key (author) references authors(id) |
678 | ) engine = InnoDB DEFAULT CHARSET=utf8; |
679 | |
680 | ALTER TABLE `books` DROP `author`</pre> |
681 | </div> |
682 | |
683 | <div class="slide"> |
684 | <h1>new join table</h1> |
685 | <pre>CREATE TABLE author_and_books( |
686 | id int(8) primary key auto_increment, |
687 | book int(8), |
688 | author int(8), |
689 | <strong>foreign key (book) references books(id), |
690 | foreign key (author) references authors(id)</strong> |
691 | ) engine = InnoDB DEFAULT CHARSET=utf8; |
692 | |
693 | ALTER TABLE `books` DROP `author`</pre> |
694 | </div> |
695 | |
696 | <div class="slide"> |
697 | <h1>has_many</h1> |
698 | </div> |
699 | |
700 | <div class="slide"> |
701 | <h1>has_many</h1> |
41a0eb8e |
702 | <pre>package Foo::Schema::<strong>Result::Books</strong>; |
52d980cb |
703 | |
41a0eb8e |
704 | __PACKAGE__->has_many( author_and_books => "Foo::Schema::Result::AuthorAndBooks", |
52d980cb |
705 | { "foreign.book" => "self.id" }, |
706 | ); |
707 | |
708 | <strong># This is auto generated by Schema::Loader</strong></pre> |
709 | </div> |
710 | |
711 | <div class="slide"> |
712 | <h1>has_many</h1> |
41a0eb8e |
713 | <pre>package Foo::Schema::<strong>Result::Books</strong>; |
52d980cb |
714 | |
715 | __PACKAGE__->has_many( |
716 | author_and_books => <strong># name of accessor</strong> |
41a0eb8e |
717 | "Foo::Schema::Result::AuthorAndBooks", <strong># related class</strong> |
52d980cb |
718 | { "foreign.book" => "self.id" } <strong># Relationship (magic often works if not |
719 | # specified, but avoid!)</strong> |
720 | ); |
721 | </pre> |
722 | </div> |
723 | |
724 | <div class="slide"> |
725 | <h1>belongs_to</h1> |
726 | </div> |
727 | |
728 | <div class="slide"> |
729 | <h1>belongs_to</h1> |
41a0eb8e |
730 | <pre>package Foo::Schema::<strong>Result::AuthorAndBooks</strong>; |
52d980cb |
731 | |
732 | __PACKAGE__->belongs_to( |
733 | book => <strong># Accessor name</strong> |
41a0eb8e |
734 | "Foo::Schema::Result::Books", <strong># Related class</strong> |
52d980cb |
735 | { id => "book" } <strong># relationship</strong> |
736 | ); |
737 | </pre> |
738 | </div> |
739 | |
740 | <div class="slide"> |
741 | <h1>same for Authors</h1> |
742 | </div> |
743 | |
744 | <div class="slide"> |
745 | <h1>with no coding...</h1> |
746 | </div> |
747 | |
748 | <div class="slide"> |
749 | <h1>many_to_many</h1> |
750 | </div> |
751 | |
752 | <div class="slide"> |
753 | <h1>many_to_many</h1> |
41a0eb8e |
754 | <pre>package Foo::Schema::<strong>Result::Books</strong>; |
52d980cb |
755 | use base 'DBIx::Class'; |
756 | |
757 | __PACKAGE__->many_to_many( |
758 | authors => "author_and_books", 'author' |
759 | ); |
760 | |
761 | 1; |
762 | |
763 | <strong> # This is <em>NOT</em> auto generated by Schema::Loader </strong></pre> |
764 | </div> |
765 | |
766 | <div class="slide"> |
767 | <h1>many_to_many</h1> |
41a0eb8e |
768 | <pre>package Foo::Schema::<strong>Result::Books</strong>; |
52d980cb |
769 | use base 'DBIx::Class'; |
770 | |
771 | __PACKAGE__->many_to_many( |
772 | authors <strong># Accessor name</strong> |
773 | => "author_and_books", <strong># has_many</strong> |
774 | 'author' <strong># foreign relationship name</strong> |
775 | ); |
776 | |
777 | 1;</pre> |
778 | </div> |
779 | |
780 | <div class="slide"> |
781 | <h1>many_to_many</h1> |
41a0eb8e |
782 | <pre>package Foo::Schema::Result::Authors; |
52d980cb |
783 | use base 'DBIx::Class'; |
784 | |
785 | __PACKAGE__->many_to_many( |
786 | "books" <strong># Accessor Name</strong> |
787 | => "author_and_books", <strong># has_many accessor_name</strong> |
788 | 'book' <strong># foreign relationship name</strong> |
789 | ); |
790 | |
791 | 1; |
792 | |
793 | <strong># This is <em>NOT</em> auto generated by Schema::Loader</strong></pre> |
794 | </div> |
795 | |
796 | <div class="slide"> |
797 | <h1>using many_to_many</h1> |
798 | <pre>#!/usr/bin/perl |
799 | |
41a0eb8e |
800 | use Foo::Schema; |
52d980cb |
801 | |
41a0eb8e |
802 | my $author_model = Foo::Schema->resultset('Authors'); |
52d980cb |
803 | my $author = $author_model->search({ |
804 | name => 'Douglas Adams', |
805 | })->single; |
806 | $author->add_to_books({ |
807 | title => 'A new book', |
808 | });</pre> |
809 | </div> |
810 | |
811 | <div class="slide"> |
812 | <h1>using many_to_many</h1> |
813 | <pre>my $author = $author_model->search({ |
814 | name => 'Douglas Adams', |
815 | })->single; |
816 | <strong>$author->add_to_books({ |
817 | title => 'A new book', |
818 | });</strong> |
819 | |
820 | # SELECT me.id, me.name FROM authors me |
821 | # WHERE ( name = ? ): 'Douglas Adams'; |
822 | # INSERT INTO books (title) VALUES (?): 'A new book'; |
823 | # INSERT INTO author_and_books (author, book) |
824 | # VALUES (?, ?): '5', '2';</pre> |
825 | </div> |
826 | |
827 | <div class="slide"> |
828 | <h1>using many_to_many</h1> |
829 | <pre>$author->add_to_books($book); |
830 | |
831 | $book->add_to_authors($author_1); |
832 | $book->add_to_authors($author_2);</pre> |
833 | </div> |
834 | |
835 | <div class="slide"> |
836 | <h1>in 16 lines of code</h1> |
837 | </div> |
838 | |
839 | <div class="slide"> |
840 | <h1>errors</h1> |
841 | <p>Read them closely!</p> |
842 | </div> |
843 | |
844 | <div class="slide"> |
845 | <h1>error messages</h1> |
41a0eb8e |
846 | <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 |
847 | </div> |
848 | |
849 | <div class="slide"> |
850 | <h1>error messages</h1> |
41a0eb8e |
851 | <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 |
852 | </div> |
853 | |
854 | <div class="slide"> |
855 | <h1>errors</h1> |
856 | <ul> |
857 | <li>Turn on debugging</li> |
858 | <li>Read error messages (sometimes useful!)</li> |
859 | <li>Check field names</li> |
860 | <li>Check package names</li> |
861 | <li>Check which database you are connected to (dev/test/live?) - repeat above</li> |
862 | </ul> |
863 | </div> |
864 | |
865 | <div class="slide"> |
866 | <h1>bonus slides!</h1> |
867 | </div> |
868 | |
869 | <div class="slide"> |
870 | <h1>Template Toolkit</h1> |
871 | <ul> |
872 | <li><pre>[% author.books.count %]</pre> not working?</li> |
873 | <li>TT all methods are called in list context</li> |
874 | <li><pre>[% author.books<strong>_rs</strong>.count %]</pre> scalar context</li> |
875 | <li><em>Available for all relationships</em></li> |
876 | </ul> |
877 | </div> |
878 | |
879 | <div class="slide"> |
880 | <h1>Catalyst</h1> |
0cffcad7 |
881 | <pre>package Your::App::Model::<strong>Foo</strong>; |
41a0eb8e |
882 | use base qw(<strong>Catalyst::Model::Schema::Schema</strong>); |
52d980cb |
883 | |
884 | use strict; |
885 | use warnings; |
886 | |
887 | __PACKAGE__->config( |
41a0eb8e |
888 | schema_class => '<strong>Foo::Schema</strong>', |
52d980cb |
889 | ); |
890 | |
891 | 1;</pre> |
892 | <p>Keep your Schema in a <em>separate</em> package to your Catalyst application</p> |
893 | </div> |
894 | |
895 | <div class="slide"> |
896 | <h1>Catalyst</h1> |
897 | <pre>sub action_name : Local { |
898 | my ($self, $c) = @_; |
899 | |
41a0eb8e |
900 | my $model = $c->model('Schema::Foo'); |
52d980cb |
901 | my $author_model = $model->resultset('Authors'); |
902 | |
903 | } |
904 | |
905 | 1;</pre> |
906 | </div> |
907 | |
908 | </div> |
909 | </body> |
910 | </html> |