Laravel Pivot Table Update with Attachment of Multi-dimension Array - Array to String Conversion Error

Hi Experts,

I'm having trouble creating a multi-dimension array to update a pivot table in Laravel with its corresponding attributes.

What I'm looking to do is have users select multiple entries from a list and once they submit their selections, I would like to add the "assigned_date" attributes to each selection when saving these records to the pivot table.


My Class Method:

public function assignUserAsset()
    {

        //Assume we can find this
        $user = User::find(1);
        $assignDate = date('Y-m-d');
        $attrib = ['assigned_date' => $assignDate];
        $assetArray = [1,2];

        //Attach current date to each selection
        $arr = [];
        foreach ($assetArray as $key) {
            $arr[] = [$key=>$attrib];
        }

        //Create entry in pivot table
        $user->assets()->attach($arr);


    }

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dd($arr)

array:2 [▼
  0 => array:1 [▼
    1 => array:1 [▼
      "assigned_date" => "2020-02-27"
    ]
  ]
  1 => array:1 [▼
    2 => array:1 [▼
      "assigned_date" => "2020-02-27"
    ]
  ]
]

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Error


I'm trying to follow this documentation here.

Specifically under section Many to Many Relationships - Attaching / Detaching

Documentation Sample

$user = App\User::find(1);

$user->roles()->detach([1, 2, 3]);

$user->roles()->attach([
    1 => ['expires' => $expires],
    2 => ['expires' => $expires],
]);

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Can you please help understand what I'm doing wrong?

Thanks,
Ricky