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【Laravel】Laravelの外部キーの設定方法

Posted at
        Schema::create('line_items', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->unsignedBigInteger('cart_id');
            $table->unsignedBigInteger('product_id');
            $table->integer('quantity');
            $table->timestamps();

            $table->foreign('cart_id')
              ->references('id')
              ->on('carts');
            $table->foreign('product_id')
              ->references('id')
              ->on('products');
        });

これはmigrationファイルの一部

            $table->foreign('cart_id')  // ここが外部キー
              ->references('id')  //外部キーに対応する親テーブルの主キー
              ->on('carts'); //親テーブル名

外部キーの設定の記述は上記。
Laravelは全体的にRailsに比べて記述が多い気がする。

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