[英]Laravel - Add column to existing pivot table and add MUL key
I have a Laravel pivot table which contains multiple primary keys: "order_id", "product_id", "variation_id". 我有一个Laravel数据透视表,其中包含多个主键:“ order_id”,“ product_id”,“ variation_id”。
I need to add a new column called "id" to this table which I do as follows: 我需要在此表中添加一个名为“ id”的新列,其操作如下:
public function up()
{
Schema::table('order_product', function (Blueprint $table)
{
$table->integer('id')->unsigned()->after('variation_sku');
});
}
My original migration file looks as follows: 我的原始迁移文件如下所示:
public function up()
{
Schema::create('order_product', function (Blueprint $table)
{
$table->integer('order_id')->unsigned()->index();
$table->foreign('order_id')->references('order_id')->on('orders')->onDelete('cascade');
$table->integer('product_id')->unsigned()->index();
$table->foreign('product_id')->references('product_id')->on('products')->onDelete('cascade');
$table->integer('variation_id')->unsigned()->index()->nullable();
$table->jsonb('variation')->nullable();
$table->integer('qty');
$table->string('variation_status')->default('bakery');
$table->timestamps();
$table->softDeletes();
$table->primary(['order_id', 'product_id', 'variation_id']);
});
}
This migration includes my 3 composite keys. 此迁移包括我的3个复合键。
I now need to add the new column "id" and add this column to the composite keys. 现在,我需要添加新列“ id”,并将此列添加到组合键中。
I cannot find anything in the Laravel documentation and have a suspicion that this may not be possible as it may affect past records in this table. 我在Laravel文档中找不到任何内容,并且怀疑这可能是不可能的,因为它可能会影响此表中的过去记录。
You could drop the primary key then create a new one: 您可以删除主键,然后创建一个新的:
public function up()
{
Schema::table('order_product', function (Blueprint $table)
{
$table->integer('id')->unsigned()->after('variation_sku');
$table->dropPrimary();
$table->primary(['id', 'order_id', 'product_id', 'variation_id']);
});
}
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