找不到外鍵約束索引

Question

我的run_tasks表具有外鍵completer_guest_id ，我需要參考其他表的列。

Schema::table('run_tasks', function (Blueprint $t) {
            $t->integer('completer_id')->nullable();
            $t->foreign('completer_id')->references('id')->on('users');
            $t->integer('completer_guest_id')->nullable();
            $t->foreign('completer_guest_id')->references('id')->on('tasks_guests');
        });

但是我找不到索引： run_tasks_completer_guest_id_foreign ，因此無法刪除外鍵約束並刪除此遷移中的列：

Schema::table('run_tasks', function (Blueprint $table){
            $table->dropForeign('run_tasks_completer_guest_id_foreign');
            $table->dropColumn('completer_guest_id');
            $table->integer('completer_guest_id')->nullable();
            $table->foreign('completer_guest_id')
                ->references('id')
                ->on('guests')
                ->onDelete('cascade');
        });

並且我收到此錯誤 ，當我運行\\d run_tasks我看到此問題是否存在任何解決方法？

Answer 1

刪除表，並嘗試將創建和外鍵分配分開

    Schema::dropIfExists('run_tasks');
    Schema::create('run_tasks', function (Blueprint $table) {
        $table->integer('completer_id')->nullable();
        $table->integer('completer_guest_id')->nullable();
        $table->index(['completer_id', 'completer_guest_id']); 
    });       
    Schema::table('run_tasks', function(Blueprint $table) {           
        $table->foreign('completer_id')->references('id')->on('users')->onDelete('cascade');
        $table->foreign('completer_guest_id')->references('id')->on('guests')->onDelete('cascade');
    });