Laravel custom form array validation rules
I want to create a form request validation and don't know how to do it.
I have a form:
<form>
<input type="text" name="fullname[0]">
<input type="text" name="document_num[0]">
<input type="text" name="fullname[1]">
<input type="text" name="document_num[1]">
<input type="text" name="fullname[2]">
<input type="text" name="document_num[2]">
.....
<input type="text" name="fullname[n]">
<input type="text" name="document_num[n]">
<input type="submit">
</form>
table 'users':
id | fullname | document_num
1 | John | 111
2 | Jane | 112
.. | ... | ...
when the user clicks on submit a request, it is sent to the controller method where it is first validated via a form request (or it could be a regular validator). So I want to write a rule that checks:
for (i=0; i<numberOfUsersToAdd; i++)
if (‘document_num[$i]’ exists in ‘users’ in field ‘document_num’ ) {
$user = Users::find(id of user in DB having this ‘document_num[$i]’) ;
check if (fullname[$i] == $user->fullname) {
return true} // input-ed users name match his/her name in DB.
else {return false} // input-ed users name doesn't match his/her name in DB.
}
else return true; // document_num[$i] doesn't exists in the database which ok
if in words: check if any input-ed document_num [$ i] exists in the users table, if yes get the user having this document_nubmer from the database and compare his / her full name with the full name [$ i] from the entrance.
How to do it?:)
Appreciate any help! :)
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Ok. The logic behind this check is as YourFormRequest
follows:
- Mark all fields as required and
document_num
optional field as whole. You can add other additional restrictions - it doesn't matter. - In
rules
theYourFormRequest
check in loop method "does the user exist for the givendocument_num
?". - If it does not exist, then ok - validation of this field is successful.
- If it exists, then check if the username is equal to the given one
fullname
. If equals then ok, validation of this field is successful. Otherwise, if that fails, attach your custom rule to this field, which always fails.
Take a look at this approach with a working example.
YourFormRequest.php
public function rules()
{
$rules = [
'fullname.*' => 'required',
'document_num.*' => 'required|integer',
];
$documentNums = request()->get('document_num');
$fullnames = request()->get('fullname');
for ($i = 0; $i < count($documentNums); $i++) {
$user = User::where('document_num', $documentNums[$i])->first();
if ($user && ($user->fullname != $fullnames[$i]) {
$rules['document_num.' . $i] = "document_num_fail:$i"; //some rule that always fails. As argument we pass a row number of field that fails
}
}
return $rules;
}
CustomValidator.php (place it, for example, in the App \ Services folder)
namespace App\Services;
class CustomValidator {
public function documentNumFailValidate($attribute, $value, $parameters, $validator) {
return false;
}
public function documentNumFailReplacer($message, $attribute, $rule, $parameters) {
return str_replace([':index'], $parameters[0], $message);
}
}
You can see two functions here. First - for validation (we always get the false reason we need). The second is just a replacement for the error message. You want to know which line of the field this error was on (for example, on the third line and in the fields: fullname [2] and document_num [2] respectively). As I wrote above in the comment for attaching the failure rule, we are specifying the number of lines that does not match the validation method (the method documentNumFailReplacer
will replace the: index placeholder in the error message with a given value)
The next step is to register these methods in AppServiceProvider.php
public function boot()
{
Validator::extend('document_num_fail', 'App\Services\CustomValidator@documentNumFailValidate');
Validator::replacer('document_num_fail', 'App\Services\CustomValidator@documentNumFailReplacer');
}
And the last step is to include your personalized messages in the validation.php file
'custom' => [
'document_num.*' => [
'document_num_fail' => 'Input-ed user name doesn`t match his/her name in DB for specified :attribute (field position/number: :index)',
]
],
'attributes' => [
'document_num.*' => 'document number',
],
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