Связь через сводную таблицу в Yii 2 (Relations with Pivot Table in Yii 2)
Есить таблица post (id, title, ...) и таблица tag (id, name), есть сводная таблица tag_post(tag_id, post_id)
Создаю связь в модели поста чтобы получить теги:
/** * GeSHi (C) 2004 - 2007 Nigel McNie, 2007 - 2008 Benny Baumann * (http://qbnz.com/highlighter/ and http://geshi.org/) */ .php.geshi_code {font-family:monospace;} .php.geshi_code .imp {font-weight: bold; color: red;} .php.geshi_code .kw1 {color: #b1b100;} .php.geshi_code .kw2 {color: #000000; font-weight: bold;} .php.geshi_code .kw3 {color: #990000;} .php.geshi_code .co1 {color: #666666; font-style: italic;} .php.geshi_code .co2 {color: #666666; font-style: italic;} .php.geshi_code .co3 {color: #0000cc; font-style: italic;} .php.geshi_code .co4 {color: #009933; font-style: italic;} .php.geshi_code .coMULTI {color: #666666; font-style: italic;} .php.geshi_code .es0 {color: #000099; font-weight: bold;} .php.geshi_code .es1 {color: #000099; font-weight: bold;} .php.geshi_code .es2 {color: #660099; font-weight: bold;} .php.geshi_code .es3 {color: #660099; font-weight: bold;} .php.geshi_code .es4 {color: #006699; font-weight: bold;} .php.geshi_code .es5 {color: #006699; font-weight: bold; font-style: italic;} .php.geshi_code .es6 {color: #009933; font-weight: bold;} .php.geshi_code .es_h {color: #000099; font-weight: bold;} .php.geshi_code .br0 {color: #009900;} .php.geshi_code .sy0 {color: #339933;} .php.geshi_code .sy1 {color: #000000; font-weight: bold;} .php.geshi_code .st0 {color: #0000ff;} .php.geshi_code .st_h {color: #0000ff;} .php.geshi_code .nu0 {color: #cc66cc;} .php.geshi_code .nu8 {color: #208080;} .php.geshi_code .nu12 {color: #208080;} .php.geshi_code .nu19 {color:#800080;} .php.geshi_code .me1 {color: #004000;} .php.geshi_code .me2 {color: #004000;} .php.geshi_code .re0 {color: #000088;} .php.geshi_code span.xtra { display:block; }
В контроллере поста передаю в представление:
/** * GeSHi (C) 2004 - 2007 Nigel McNie, 2007 - 2008 Benny Baumann * (http://qbnz.com/highlighter/ and http://geshi.org/) */ .php.geshi_code {font-family:monospace;} .php.geshi_code .imp {font-weight: bold; color: red;} .php.geshi_code .kw1 {color: #b1b100;} .php.geshi_code .kw2 {color: #000000; font-weight: bold;} .php.geshi_code .kw3 {color: #990000;} .php.geshi_code .co1 {color: #666666; font-style: italic;} .php.geshi_code .co2 {color: #666666; font-style: italic;} .php.geshi_code .co3 {color: #0000cc; font-style: italic;} .php.geshi_code .co4 {color: #009933; font-style: italic;} .php.geshi_code .coMULTI {color: #666666; font-style: italic;} .php.geshi_code .es0 {color: #000099; font-weight: bold;} .php.geshi_code .es1 {color: #000099; font-weight: bold;} .php.geshi_code .es2 {color: #660099; font-weight: bold;} .php.geshi_code .es3 {color: #660099; font-weight: bold;} .php.geshi_code .es4 {color: #006699; font-weight: bold;} .php.geshi_code .es5 {color: #006699; font-weight: bold; font-style: italic;} .php.geshi_code .es6 {color: #009933; font-weight: bold;} .php.geshi_code .es_h {color: #000099; font-weight: bold;} .php.geshi_code .br0 {color: #009900;} .php.geshi_code .sy0 {color: #339933;} .php.geshi_code .sy1 {color: #000000; font-weight: bold;} .php.geshi_code .st0 {color: #0000ff;} .php.geshi_code .st_h {color: #0000ff;} .php.geshi_code .nu0 {color: #cc66cc;} .php.geshi_code .nu8 {color: #208080;} .php.geshi_code .nu12 {color: #208080;} .php.geshi_code .nu19 {color:#800080;} .php.geshi_code .me1 {color: #004000;} .php.geshi_code .me2 {color: #004000;} .php.geshi_code .re0 {color: #000088;} .php.geshi_code span.xtra { display:block; }
В представлении если вызываю var_dump($post->tags); то вижу список тегов к каждому посту.
/** * GeSHi (C) 2004 - 2007 Nigel McNie, 2007 - 2008 Benny Baumann * (http://qbnz.com/highlighter/ and http://geshi.org/) */ .php.geshi_code {font-family:monospace;} .php.geshi_code .imp {font-weight: bold; color: red;} .php.geshi_code .kw1 {color: #b1b100;} .php.geshi_code .kw2 {color: #000000; font-weight: bold;} .php.geshi_code .kw3 {color: #990000;} .php.geshi_code .co1 {color: #666666; font-style: italic;} .php.geshi_code .co2 {color: #666666; font-style: italic;} .php.geshi_code .co3 {color: #0000cc; font-style: italic;} .php.geshi_code .co4 {color: #009933; font-style: italic;} .php.geshi_code .coMULTI {color: #666666; font-style: italic;} .php.geshi_code .es0 {color: #000099; font-weight: bold;} .php.geshi_code .es1 {color: #000099; font-weight: bold;} .php.geshi_code .es2 {color: #660099; font-weight: bold;} .php.geshi_code .es3 {color: #660099; font-weight: bold;} .php.geshi_code .es4 {color: #006699; font-weight: bold;} .php.geshi_code .es5 {color: #006699; font-weight: bold; font-style: italic;} .php.geshi_code .es6 {color: #009933; font-weight: bold;} .php.geshi_code .es_h {color: #000099; font-weight: bold;} .php.geshi_code .br0 {color: #009900;} .php.geshi_code .sy0 {color: #339933;} .php.geshi_code .sy1 {color: #000000; font-weight: bold;} .php.geshi_code .st0 {color: #0000ff;} .php.geshi_code .st_h {color: #0000ff;} .php.geshi_code .nu0 {color: #cc66cc;} .php.geshi_code .nu8 {color: #208080;} .php.geshi_code .nu12 {color: #208080;} .php.geshi_code .nu19 {color:#800080;} .php.geshi_code .me1 {color: #004000;} .php.geshi_code .me2 {color: #004000;} .php.geshi_code .re0 {color: #000088;} .php.geshi_code span.xtra { display:block; }
Но если обращаюсь напрямую к именам тегов ($post->tags->name), то получаю ошибку:
Trying to get property of non-object
В чем я ошибаюсь?
Создаю связь в модели поста чтобы получить теги:
/** * GeSHi (C) 2004 - 2007 Nigel McNie, 2007 - 2008 Benny Baumann * (http://qbnz.com/highlighter/ and http://geshi.org/) */ .php.geshi_code {font-family:monospace;} .php.geshi_code .imp {font-weight: bold; color: red;} .php.geshi_code .kw1 {color: #b1b100;} .php.geshi_code .kw2 {color: #000000; font-weight: bold;} .php.geshi_code .kw3 {color: #990000;} .php.geshi_code .co1 {color: #666666; font-style: italic;} .php.geshi_code .co2 {color: #666666; font-style: italic;} .php.geshi_code .co3 {color: #0000cc; font-style: italic;} .php.geshi_code .co4 {color: #009933; font-style: italic;} .php.geshi_code .coMULTI {color: #666666; font-style: italic;} .php.geshi_code .es0 {color: #000099; font-weight: bold;} .php.geshi_code .es1 {color: #000099; font-weight: bold;} .php.geshi_code .es2 {color: #660099; font-weight: bold;} .php.geshi_code .es3 {color: #660099; font-weight: bold;} .php.geshi_code .es4 {color: #006699; font-weight: bold;} .php.geshi_code .es5 {color: #006699; font-weight: bold; font-style: italic;} .php.geshi_code .es6 {color: #009933; font-weight: bold;} .php.geshi_code .es_h {color: #000099; font-weight: bold;} .php.geshi_code .br0 {color: #009900;} .php.geshi_code .sy0 {color: #339933;} .php.geshi_code .sy1 {color: #000000; font-weight: bold;} .php.geshi_code .st0 {color: #0000ff;} .php.geshi_code .st_h {color: #0000ff;} .php.geshi_code .nu0 {color: #cc66cc;} .php.geshi_code .nu8 {color: #208080;} .php.geshi_code .nu12 {color: #208080;} .php.geshi_code .nu19 {color:#800080;} .php.geshi_code .me1 {color: #004000;} .php.geshi_code .me2 {color: #004000;} .php.geshi_code .re0 {color: #000088;} .php.geshi_code span.xtra { display:block; }
public function getTags() {
return $this->hasMany(Tag::className(),
['id' => 'tag_id'])->viaTable('tag_post', ['post_id' => 'id']);
}
return $this->hasMany(Tag::className(),
['id' => 'tag_id'])->viaTable('tag_post', ['post_id' => 'id']);
}
В контроллере поста передаю в представление:
/** * GeSHi (C) 2004 - 2007 Nigel McNie, 2007 - 2008 Benny Baumann * (http://qbnz.com/highlighter/ and http://geshi.org/) */ .php.geshi_code {font-family:monospace;} .php.geshi_code .imp {font-weight: bold; color: red;} .php.geshi_code .kw1 {color: #b1b100;} .php.geshi_code .kw2 {color: #000000; font-weight: bold;} .php.geshi_code .kw3 {color: #990000;} .php.geshi_code .co1 {color: #666666; font-style: italic;} .php.geshi_code .co2 {color: #666666; font-style: italic;} .php.geshi_code .co3 {color: #0000cc; font-style: italic;} .php.geshi_code .co4 {color: #009933; font-style: italic;} .php.geshi_code .coMULTI {color: #666666; font-style: italic;} .php.geshi_code .es0 {color: #000099; font-weight: bold;} .php.geshi_code .es1 {color: #000099; font-weight: bold;} .php.geshi_code .es2 {color: #660099; font-weight: bold;} .php.geshi_code .es3 {color: #660099; font-weight: bold;} .php.geshi_code .es4 {color: #006699; font-weight: bold;} .php.geshi_code .es5 {color: #006699; font-weight: bold; font-style: italic;} .php.geshi_code .es6 {color: #009933; font-weight: bold;} .php.geshi_code .es_h {color: #000099; font-weight: bold;} .php.geshi_code .br0 {color: #009900;} .php.geshi_code .sy0 {color: #339933;} .php.geshi_code .sy1 {color: #000000; font-weight: bold;} .php.geshi_code .st0 {color: #0000ff;} .php.geshi_code .st_h {color: #0000ff;} .php.geshi_code .nu0 {color: #cc66cc;} .php.geshi_code .nu8 {color: #208080;} .php.geshi_code .nu12 {color: #208080;} .php.geshi_code .nu19 {color:#800080;} .php.geshi_code .me1 {color: #004000;} .php.geshi_code .me2 {color: #004000;} .php.geshi_code .re0 {color: #000088;} .php.geshi_code span.xtra { display:block; }
$posts = Post::find()->all();
В представлении если вызываю var_dump($post->tags); то вижу список тегов к каждому посту.
/** * GeSHi (C) 2004 - 2007 Nigel McNie, 2007 - 2008 Benny Baumann * (http://qbnz.com/highlighter/ and http://geshi.org/) */ .php.geshi_code {font-family:monospace;} .php.geshi_code .imp {font-weight: bold; color: red;} .php.geshi_code .kw1 {color: #b1b100;} .php.geshi_code .kw2 {color: #000000; font-weight: bold;} .php.geshi_code .kw3 {color: #990000;} .php.geshi_code .co1 {color: #666666; font-style: italic;} .php.geshi_code .co2 {color: #666666; font-style: italic;} .php.geshi_code .co3 {color: #0000cc; font-style: italic;} .php.geshi_code .co4 {color: #009933; font-style: italic;} .php.geshi_code .coMULTI {color: #666666; font-style: italic;} .php.geshi_code .es0 {color: #000099; font-weight: bold;} .php.geshi_code .es1 {color: #000099; font-weight: bold;} .php.geshi_code .es2 {color: #660099; font-weight: bold;} .php.geshi_code .es3 {color: #660099; font-weight: bold;} .php.geshi_code .es4 {color: #006699; font-weight: bold;} .php.geshi_code .es5 {color: #006699; font-weight: bold; font-style: italic;} .php.geshi_code .es6 {color: #009933; font-weight: bold;} .php.geshi_code .es_h {color: #000099; font-weight: bold;} .php.geshi_code .br0 {color: #009900;} .php.geshi_code .sy0 {color: #339933;} .php.geshi_code .sy1 {color: #000000; font-weight: bold;} .php.geshi_code .st0 {color: #0000ff;} .php.geshi_code .st_h {color: #0000ff;} .php.geshi_code .nu0 {color: #cc66cc;} .php.geshi_code .nu8 {color: #208080;} .php.geshi_code .nu12 {color: #208080;} .php.geshi_code .nu19 {color:#800080;} .php.geshi_code .me1 {color: #004000;} .php.geshi_code .me2 {color: #004000;} .php.geshi_code .re0 {color: #000088;} .php.geshi_code span.xtra { display:block; }
<?php foreach ($posts as $post): ?>
<?= $post->title ?> // Работает
<?= $post->category->name ?> // Работает
<? var_dump($post->tags); ?>
<?php endforeach; ?>
<?= $post->title ?> // Работает
<?= $post->category->name ?> // Работает
<? var_dump($post->tags); ?>
<?php endforeach; ?>
Но если обращаюсь напрямую к именам тегов ($post->tags->name), то получаю ошибку:
Trying to get property of non-object
В чем я ошибаюсь?