Can you use flow for advanced validations

[sptv2reg]

Hi

Let me start with the usual stuff - what a great product you've made here, thanks.

I've got a pretty advanced validation of a string field. The validation requires me to make a http request to an external service to check certain things. I can do that with the http-module.

However, is it possible to trigger this on insert/update and return an error message that result in the same red alertbox at the top as the native validation rules?

[licitdev]

Here's an example of how you can tap on the existing validation errors.

Screen.Recording.2022-12-14.at.7.12.35.PM.mov

module.exports = function registerHooks({ filter }, { exceptions }) {
	filter('test.items.create', async (input) => {
		if (!input.name) {
			throw new exceptions.FailedValidationException({
				message: 'Missing name',
				path: ['name'],
				type: 'custom.name.invalid',
				context: {
					invalids: [''],
				},
			});
		} else if (input.name !== 'test') {
			throw new exceptions.FailedValidationException({
				message: 'Invalid name',
				path: ['name'],
				type: 'custom.name.invalid',
				context: {
					invalids: [input.name],
				},
			});
		}
	});
};

As the naming of type and values required in context, please refer to https://github.com/directus/directus/blob/c98e99be74fad8c33382c1614b4a776817150ef7/packages/shared/src/exceptions/failed-validation.ts for more information.

[licitdev]

Yes, the above is an extension. In flows, you do not have access to the exception, but you may throw the error values directly as follows. The below example is to be used in a Run Script operation.

module.exports = async function (data) {
	const input = data.$trigger.payload;

	if (!input.name) {
		throw {
			message: 'Invalid name',
			extensions: {
				code: 'FAILED_VALIDATION',
				field: 'name',
				type: 'nempty',
			},
		};
	} else if (input.name !== 'test') {
		throw {
			message: 'Invalid name',
			extensions: {
				code: 'FAILED_VALIDATION',
				field: 'name',
				type: 'neq',
				invalid: input.name,
			},
		};
	}
};

[sptv2reg]

This works. Excellent, thanks!

[sptv2reg]

A short followup - It doesn't seem that "message" is doing anything. If you use "neq" it will output "Name: Value can't be" no matter what I write in message.

[licitdev]

The validation error reads into the type for the error message. Custom validation error messages isn't currently supported.

[maisur]

If you set the code using http code. The error will show up in modal and using the custom message.

throw {
	message: 'Invalid image',
	extensions: {
		code: 400,
		field: 'name',
		type: 'neq',
		invalid: input.name,
	},
};