如何在Laravel中获取查询生成器结果的所有列的数组？

Question

I am trying to get the columns of a dynamically created table. I looked at this question to find how to get the columns.

\DB::getSchemaBuilder()->getColumnListing(\DB::table('product_list')
    ->join('product_categories', 'product_list.product_category', '=', 'product_categories.id')
    ->join('product_types', 'product_list.product_type', '=', 'product_types.id')
    ->where('product_list.id', $this->id)
    ->orderBy('product_list.id', 'DESC')
    ->get()
);

However, this is giving me an output of [] . If I run the command without encapsulating it with \\DB::getSchemaBuilder()->getColumnListing() I get this:

Collection {#652 ▼
  #items: array:1 [▼
    0 => {#650 ▼
      +"id": 3
      +"cost": "150.00"
      +"product_category": 1
      +"product_type": 3
      +"product_score": 0
      +"created_at": "2019-01-16 16:34:29"
      +"updated_at": "2019-01-16 16:34:29"
      +"rating": 0
      +"down_payment": "10.00"
      +"title": "Static"
      +"price_start": "50.00"
      +"price_stop": "150.00"
      +"theme": "Custom"
      +"pages": 4
      +"rbac": 0
      +"portal": 0
      +"external_software": 0
      +"company_supplier": "Iezon Solutions"
    }
  ]
}

How can I get an array of all of the columns?

Answer 1

如果只需要动态创建的表列名，则快速解决方案是：

array_keys(get_object_vars($collection->first())); // will output ['id', 'cost', 'product_category', ...]

Answer 2

This is probably by far the worst solution to use, but I don't have the time to search through the collection documentation to find a better method of doing this or the way its meant to be done using Laravel functionality.

I decided to convert it toArray() , use the first index [0] and cast it to an array. This then allows me to use array_keys() to find the column names.

array_keys((array) \DB::table('product_list')->join('product_categories', 'product_list.product_category', '=', 'product_categories.id')
            ->join('product_types', 'product_list.product_type', '=', 'product_types.id')
            ->where('product_list.id', $this->id)
            ->orderBy('product_list.id', 'DESC')->get()->toArray()[0])