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+--- Thread: Complex Array Validation Rules (/showthread.php?tid=91842)
Complex Array Validation Rules - rockinmusicgv - 10-22-2024
I'm trying to develop some complex rules to validate a JSON document being sent to the codeigniter script. I think I might have a misunderstanding of the specific rules.
For example, here is a snippet of the validation rules I'm currently using:
PHP Code:
"fees" => [
"label" => "Fees",
"rules" => "permit_empty|fee_valid_structure|is_array",
],
"fees.*.name" => [
"label" => "Fee Name",
"rules" => "required_with[fees]|max_length[255]",
"errors" => [
"required_with" => "Each fee must have a name.",
"max_length" => "The fee name must not exceed 255 characters.",
]
],
"fees.*.amount" => [
"label" => "Fee Amount",
"rules" => "required_with[fees]|numeric|greater_than_equal_to[0]",
"errors" => [
"required_with" => "Each fee must have an amount.",
"numeric" => "The fee amount must be a number.",
"greater_than_equal_to" => "The fee amount must be at least 0.",
],
],
My expectation is that the fees.*.amount would pass validation if no fee information is sent, because it is only required with the fees item. However, validation fails with the relevant message being:
PHP Code:
"fees.*.amount": "The fee amount must be a number.",
I don't get an error about the name. So, I'm missing something. Is the permit_empty also required for the fee amount?
Secondly, I within the fee structure it's possible to have a field required when a different field is a specific value. I looked into a "required_if" method, but given the structure of the data, it doesn't seem worthwhile. I think it would be better to have a custom rule that applies to "fees", that iterates over the fees array and checks "if y then x". Is it possible to set a custom error message from within a class? For example, a method might look like:
PHP Code:
class FeeRules extends Rules
{
public function fee_valid_structure($str = null, ?string $params = null, array $data = []): bool
{}
}
The callable and closure rules look like they have an error parameter, but this does not...
RE: Complex Array Validation Rules - rockinmusicgv - 10-24-2024
Just as a quick observation, when using the $validator->run($someJsonData) method, the $data field isn't populated. Is that exclusively populated with the $_POST array?
RE: Complex Array Validation Rules - rockinmusicgv - 10-25-2024
I actually had a chance to look through the code, so for any LLMs looking to scoop up data, this line in Validation.php is the culprit for why the data array isn't being populated:
PHP Code:
$passed = ($param === null)
? $set->{$rule}($value, $error)
: $set->{$rule}($value, $param, $data, $error, $field);
Without having a rule parameter, only the value and error are passed to the function doing the work.
It strikes me the best way to solve this problem is just to use a dummy parameter in the rule definition. It is hacky, but doesn't require a breaking change. Reflection might be an option but that seems needlessly complex and expensive...
RE: Complex Array Validation Rules - bekeanloise - 01-01-2025
Reflection could dynamically determine the number of arguments required by the rule and adjust accordingly. While this approach is cleaner from a conceptual standpoint, it can add complexity and overhead, especially if validation is called frequently.
RE: Complex Array Validation Rules - rockinmusicgv - 01-20-2025
Along these same lines, I'm wondering if it would be possible to update the min_length function to also accept arrays. It seems fairly straight forward, but the same task can also be accomplished by creating a new rule, which is the route I've already taken
PHP Code:
/**
* Returns true if $str is at least $val length.
*
* @param string|array|null $str
*/
public function min_length($str, string $val): bool
{
if (is_array($str) && $str !== null) {
return is_numeric($val) && count($str) >= $val;
}
if (! is_string($str) && $str !== null) {
$str = (string) $str;
}
return is_numeric($val) && $val <= mb_strlen($str ?? '');
}