Make validation errors more specific

[swirtSJW]

Before

After

Or

Closes #22

Since this is done in the Exception class, this should address all 4 situations in RootedJsonData.php that call this exception and thereby improve all the output in the places where validation can fail in DKAN

[Copilot]

Pull request overview

This PR enhances validation error messages by making them more specific and informative. Instead of generic validation failure messages, the exception now includes detailed information about what failed validation, where it failed (data pointer path), and what the invalid value was.

Key Changes:

• Modified ValidationException constructor to append detailed error information to the exception message
• Each validation error is formatted with a numbered list showing the data pointer path and the invalid value

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[Copilot]

The variable name i is ambiguous for a counter in this context. Consider renaming it to errorNumber or errorIndex to better convey its purpose as an error counter in the formatted output.

Suggested change

	$i = 1;
	foreach ($errors as $error) {
	$pointer = implode(" -> ", $error->dataPointer());
	$invalidValue = $error->data();
	if (is_array($invalidValue) || is_object($invalidValue)) {
	$invalidValue = json_encode($invalidValue);
	}
	$message .= "\n {$i}) {$pointer}: {$invalidValue}";
	$i++;
	$errorIndex = 1;
	foreach ($errors as $error) {
	$pointer = implode(" -> ", $error->dataPointer());
	$invalidValue = $error->data();
	if (is_array($invalidValue) || is_object($invalidValue)) {
	$invalidValue = json_encode($invalidValue);
	}
	$message .= "\n {$errorIndex}) {$pointer}: {$invalidValue}";
	$errorIndex++;

[Copilot]

The separator ' -> ' is hardcoded. Consider extracting it as a class constant (e.g., POINTER_SEPARATOR) to improve maintainability and make it easier to change the formatting consistently if needed in the future.

[swirtSJW]

This makes use of the methods available https://opis.io/json-schema/1.x/php-validation-result.html

[swirtSJW]

How it appears when a dataset publish fails