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148 lars 1 
<?php
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namespace Illuminate\Database\Schema;
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use Illuminate\Support\Fluent;
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/**
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 * @method ForeignKeyDefinition deferrable(bool $value = true) Set the foreign key as deferrable (PostgreSQL)
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 * @method ForeignKeyDefinition initiallyImmediate(bool $value = true) Set the default time to check the constraint (PostgreSQL)
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 * @method ForeignKeyDefinition on(string $table) Specify the referenced table
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 * @method ForeignKeyDefinition onDelete(string $action) Add an ON DELETE action
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 * @method ForeignKeyDefinition onUpdate(string $action) Add an ON UPDATE action
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 * @method ForeignKeyDefinition references(string|array $columns) Specify the referenced column(s)
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 */
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class ForeignKeyDefinition extends Fluent
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{
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    /**
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     * Indicate that updates should cascade.
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     *
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     * @return $this
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     */
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    public function cascadeOnUpdate()
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    {
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        return $this->onUpdate('cascade');
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    }
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    /**
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     * Indicate that updates should be restricted.
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     *
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     * @return $this
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     */
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    public function restrictOnUpdate()
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    {
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        return $this->onUpdate('restrict');
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    }
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    /**
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     * Indicate that deletes should cascade.
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     *
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     * @return $this
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     */
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    public function cascadeOnDelete()
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    {
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        return $this->onDelete('cascade');
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    }
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    /**
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     * Indicate that deletes should be restricted.
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     *
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     * @return $this
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     */
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    public function restrictOnDelete()
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    {
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        return $this->onDelete('restrict');
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    }
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    /**
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     * Indicate that deletes should set the foreign key value to null.
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     *
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     * @return $this
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     */
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    public function nullOnDelete()
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    {
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        return $this->onDelete('set null');
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    }
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}