Laravel mysql错误关系数据库？

Question

Syntax error or access violation: 1072 Key column 'collection_id' doesn't exist in table (SQL: alter table products add constraint products_collection_id_foreign foreign key ( collection_id ) references collections ( id ) on delete cascade)

So im having this issue trying to relation products with collections with a collection_id.

This is my collection migration

    class CreateCollectionsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('collections', function (Blueprint $table) {
            $table->id();
            $table->timestamps();
            $table->string('name');
            $table->string('author');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('collections');
    }
}

This is my product migration

class CreateProductsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('products', function (Blueprint $table) {
            $table->id();
            $table->timestamps();
            $table->string('name');
            $table->integer('price');
            $table->string('src');
            $table->unsignedBigInteger('collection_id');
            $table->foreign('collection_id')->references('id')->on('collections')->onDelete("cascade");
            $table->integer('amount');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('products');
    }
}

Answer 1

您的迁移是否正确运行您还可以检查创建表时的迁移顺序，如果集合是在产品之前创建的，如果产品是在集合之前创建的，它会抛出此错误，因为集合尚未创建，还有一个快捷方式定义外键是

$table->foreignId('collection_id')->constrained()->cascadeOnDelete();

Answer 2

You can do it the following way.

$table->unsignedBigInteger('collection_id');
$table->foreign('collection_id')->references('id')->on('collections')->onDelete("cascade");

And one more thing run the following command :

php artisan migrate:fresh 

or

 php artisan migrate:refresh 

hope your problem will be resolved.or can follow the following URL Laravel migration: "Foreign key constraint is incorrectly formed" (errno 150)