RequiredIf validator with multiple values fails validating boolean 0

[Norgul]

• Laravel Version: 8.36.2
• PHP Version: 7.4.1
• Database Driver & Version: not related to the issue

Description:

Since boolean validation rule accepts and validates several boolean value variants I wanted to enable required_if validator to accept and validate against those values as well, however it fails having 0 as a value.

Steps To Reproduce:

Correct behavior 1:

// Validation
'some_bool_field' => 'required|boolean',
'check_against_1' => 'required_if:some_bool_field,true',
'check_against_2' => 'required_if:some_bool_field,false',

// Payload
'some_bool_field' => true, // will trigger 'check_against_1'
'some_bool_field' => false, // will trigger 'check_against_2'

Correct behavior 2:

// Validation
'some_bool_field' => 'required|boolean',
'check_against_1' => 'required_if:some_bool_field,1',
'check_against_2' => 'required_if:some_bool_field,0',

// Payload
'some_bool_field' => 1, // will trigger 'check_against_1'
'some_bool_field' => 0, // will trigger 'check_against_2'

Invalid behavior:

// Validation
'some_bool_field' => 'required|boolean',
'check_against_1' => 'required_if:some_bool_field,1,true',
'check_against_2' => 'required_if:some_bool_field,0,false',

// Payload
'some_bool_field' => true, // will trigger 'check_against_1'
'some_bool_field' => false, // will trigger 'check_against_2'
'some_bool_field' => 1, // will trigger 'check_against_1'

'some_bool_field' => 0, // should trigger 'check_against_2', but triggers both

[driesvints]

It only triggers check_against_2 for me:

Validator::make(['some_bool_field' => 0], [
    'some_bool_field' => 'required|boolean',
    'check_against_1' => 'required_if:some_bool_field,1,true',
    'check_against_2' => 'required_if:some_bool_field,0,false',
]);

{
  "check_against_2": [
    "The check against 2 field is required when some bool field is 0."
  ]
}

[Norgul]

@driesvints for which Laravel version?

Doing exactly what you did:

Route::get('test', function(){
    Validator::make(['some_bool_field' => 0], [
        'some_bool_field' => 'required|boolean',
        'check_against_1' => 'required_if:some_bool_field,1,true',
        'check_against_2' => 'required_if:some_bool_field,0,false',
    ])->validate();
});

And the response:

{
    "message": "The given data was invalid.",
    "errors": {
        "check_against_1": [
            "The check against 1 field is required when some bool field is 0."
        ],
        "check_against_2": [
            "The check against 2 field is required when some bool field is 0."
        ]
    }
}

[driesvints]

@Norgul I get a validation exception for that code. Laravel v8.36.2

[driesvints]

[Norgul]

@driesvints you are doing it wrong. You are dumping the current rule only. Run my exact route to reproduce.

[driesvints]

I did run your exact code.

[Norgul]

@driesvints but you are showing a dump, not a response?

[driesvints]

This is the validation exception I get when calling the validate method from your code example. In your route example you're not returning anything.

[Norgul]

@driesvints Try putting it within api routes without dumping, so that you'll get 422 with all error messages.

[calkeo]

If you call this within the API middleware with the correct Accept: application/json header, then I also receive the validation exception for both check_against_1 and check_against_2 when using the string boolean representation i.e. true/false.

For example:

Validator::make(['some_bool_field' => 0], [
        'some_bool_field' => 'required|boolean',
        'check_against_1' => 'required_if:some_bool_field,true',
        'check_against_2' => 'required_if:some_bool_field,false',
    ])->validate();

Returns

{
    "message": "The given data was invalid.",
    "errors": {
        "check_against_1": [
            "The check against 1 field is required when some bool field is 0."
        ],
        "check_against_2": [
            "The check against 2 field is required when some bool field is 0."
        ]
    }
}

Whereas

Validator::make(['some_bool_field' => 0], [
        'some_bool_field' => 'required|boolean',
        'check_against_1' => 'required_if:some_bool_field,1',
        'check_against_2' => 'required_if:some_bool_field,0',
    ])->validate();

Returns

{
    "message": "The given data was invalid.",
    "errors": {
        "check_against_2": [
            "The check against 2 field is required when some bool field is 0."
        ]
    }
}

However, the behaviour is different when running PHP 8 vs PHP 7.4. PHP 8 correctly evaluates the string values true/false as booleans, whereas 7.4 does not.