laravel validation rule not exists code example

Example 1: laravel exists validation

'state_id' => 'exists:states,id'

Example 2: laravel validation types for float

//For float, must use numeric validator

/**
  * Get the validation rules that apply to the request.
  *
  * @return array
 */
public function rules()
{
  return [
    'field' => 'numeric'
  ];
}