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<?php
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return
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$code = <<<CODE
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<?php
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use yii\db\Migration;
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/**
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* Handles the creation of table `post_tag`.
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* Has foreign keys to the tables:
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*
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* - `post`
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* - `tag`
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*/
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class {$class} extends Migration
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{
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/**
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* @inheritdoc
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*/
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public function up()
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{
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\$this->createTable('post_tag', [
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'post_id' => \$this->integer(),
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'tag_id' => \$this->integer(),
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'PRIMARY KEY(post_id, tag_id)',
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]);
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// creates index for column `post_id`
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\$this->createIndex(
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'idx-post_tag-post_id',
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'post_tag',
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'post_id'
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);
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// add foreign key for table `post`
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\$this->addForeignKey(
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'fk-post_tag-post_id',
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'post_tag',
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'post_id',
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'post',
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'id',
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'CASCADE'
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);
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// creates index for column `tag_id`
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\$this->createIndex(
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'idx-post_tag-tag_id',
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'post_tag',
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'tag_id'
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);
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// add foreign key for table `tag`
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\$this->addForeignKey(
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'fk-post_tag-tag_id',
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'post_tag',
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'tag_id',
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'tag',
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'id',
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'CASCADE'
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);
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}
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/**
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* @inheritdoc
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*/
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public function down()
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{
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// drops foreign key for table `post`
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\$this->dropForeignKey(
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'fk-post_tag-post_id',
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'post_tag'
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);
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// drops index for column `post_id`
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\$this->dropIndex(
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'idx-post_tag-post_id',
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'post_tag'
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);
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// drops foreign key for table `tag`
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\$this->dropForeignKey(
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'fk-post_tag-tag_id',
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'post_tag'
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);
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// drops index for column `tag_id`
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\$this->dropIndex(
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'idx-post_tag-tag_id',
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'post_tag'
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);
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\$this->dropTable('post_tag');
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}
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}
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CODE;
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