Laravel 可空验证规则不起作用

Question

I recently upgraded to laravel 5.4 (from 5.2) to make use of the nullable validation rule.

I have a field act_post_code which can be either an integer OR null . So I provided the following rule in my Request class.

 'act_post_code' => 'integer|nullable'

In Postman using form-data , I provide a key = act_post_code with its value = null .

The response I get is the following:

 { "act_post_code": [ "The act post code must be an integer." ] }

Answer 1

Explanation:

Unfortunately, it seems that nullable is only valid with certain other validations.

For example: 'act_post_code' => 'nullable|integer' will give you the error: "validation.integer"

However, 'act_post_code' => 'nullable|date' works fine.

Fix:

As a work around for these validations, you can make them dynamic. For example, before the validator:

$act_post_code_rules = $request->act_post_code? 'integer': '';

then, within the validate:

'act_post_code' => $act_post_code_rules

Answer 2

In order to validate the field act_post_code which can be either be of type integer or nullable, you can try out the following:

• When declaring in the migration,the Schema of the table where there is the column act_post_code declare the column like $table->integer('act_post_code')->nullable();
• This one might just work for you to validate 'act_post_code' =>'sometimes|nullable|integer'

Answer 3

Open your migration file and make the this field as nullable

For eg

Schema::create('your_table_name', function (Blueprint $table) { $table->integer('act_post_code ')->nullable(); });

Make sure it is present in your model file in the fillable section

protected $fillable = ['act_post_code'];

Answer 4

After Some Test I found that nullable rule only work if only the data that we pass really was a null data.
so in my test case i use the validation rule like this:
"counter" => "nullable|numeric"
and in the blade file, I use Form::text('counter','') as element to input my data.

Then i use it with few test case:

1. When I input the counter data with a non-numeric value it will response with error:
   "the counter must be a number" .
2. When I input the counter data with a numeric value it will pass the validation test.
3. When I not input any data to the counter it will pass the validation test.

so i check the data manually using dd($request_data) or if you using ajax just return $request_data and print it using console.log("data") like:

 $.ajax({ type:'POST', data:{_token:"{{ csrf_token() }}", counter:$('input[name="counter"]').val() },success:function(data){ console.log(data); } });

and found out that when input field is emptied it will give the null value.

Answer 5

One can die and dump request parameters and check whether the actual value is null or "null" (in string). Sometimes when submitting a form via javascript we use FormData() to append data to the form, in those scenarios it may send a null value as in string type "null"

 array:5 [ "firstName" => "Kaustubh" "middleName" => "null" // null as string "lastName" => "Bagwe" "contactNumber" => null // null value "photo" => null "_method" => "PUT" ]