Laravel onDelete('cascade') 不起作用

Question

我的表格：

 Schema::create('support_categories', function (Blueprint $table) {
        $table->id();
        $table->string('title');
        $table->string('slug')->nullable();
        $table->timestamps();
    });
Schema::create('supports', function (Blueprint $table) {
        $table->id();
        $table->foreignId('support_category_id')->onDelete('cascade')->constrained('support_categories')->nullable();
        $table->string('title');
        $table->string('slug');
        $table->timestamps();
    });

当我尝试删除 support_categories

时出现以下错误

Integrity constraint violation: 1451 Cannot delete or update a parent row: a foreign key constraint fails

Answer 1

你只是把外键写错了。

而不是：

$table->foreignId('support_category_id')->onDelete('cascade')->constrained('support_categories')->nullable();

写：

$table->foreignId('support_category_id')->nullable()->constrained('support_categories')->onDelete('cascade');

或者您可以使用 casadeOnDelete():

$table->foreignId('support_category_id')->nullable()->constrained('support_categories')->casadeOnDelete();

Laravel onDelete('cascade') 不起作用

Laravel onDelete('cascade') does not work

sql

laravel

eloquent