Validate DSL and message returned to client

[Karts <ka...@gmail.com>]

Hi,

In my Rest DSL route, I use the Validate DSL and mvel to validate data as it
goes through the pipeline. If there's a validation exception, I would like
to return back to the client both an HTTP_RESPONSE_CODE 400 as well as the
reason for the error in the body. I'm able to set the HTTP response code but
not sure how I can customize the reason for each validation exception.

For example, in my route below:

@Override
public void configure() throws Exception {
onException(org.apache.camel.processor.validation.PredicateValidationException.class).handled(true).transform().simple("Validation
failed").setHeader(Exchange.HTTP_RESPONSE_CODE, constant(400));
	rest("system")
		.put("cancel-trade")
		.route()
		.validate().mvel("request.body.?extid > 0")
		.to("sql:select id from trades where outid = :#extid
?outputHeader=id&outputType=SelectOne")
		.validate().mvel("request.headers.?id != null")
		.to("mock:bean");

I currently only say "Validation failed" in the body in the case of a
PredicateValdiationException thrown. I would like to return a customized
human readable message though depending on each failure. So if the first
validate fails, I would like the reply to say "External ID must be greater
than 0" and if the second validate fails "Trade not found in trades table".

Is this possible with the Validate DSL?

Thanks



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Re: Validate DSL and message returned to client

[Claus Ibsen <cl...@gmail.com>]

Hi

No the validate dsl will use a predicate that returns true or false.
If it returns false, then an exception is thrown.

If you want to do some kind of custom error message etc. Then calling
a bean is simpler.

But we could consider adding some way of allowing validate dsl to use
an expression that can generate the exception message.

On Tue, Jun 16, 2015 at 5:49 AM, Karts <ka...@gmail.com> wrote:
> Hi,
>
> In my Rest DSL route, I use the Validate DSL and mvel to validate data as it
> goes through the pipeline. If there's a validation exception, I would like
> to return back to the client both an HTTP_RESPONSE_CODE 400 as well as the
> reason for the error in the body. I'm able to set the HTTP response code but
> not sure how I can customize the reason for each validation exception.
>
> For example, in my route below:
>
> @Override
> public void configure() throws Exception {
> onException(org.apache.camel.processor.validation.PredicateValidationException.class).handled(true).transform().simple("Validation
> failed").setHeader(Exchange.HTTP_RESPONSE_CODE, constant(400));
>         rest("system")
>                 .put("cancel-trade")
>                 .route()
>                 .validate().mvel("request.body.?extid > 0")
>                 .to("sql:select id from trades where outid = :#extid
> ?outputHeader=id&outputType=SelectOne")
>                 .validate().mvel("request.headers.?id != null")
>                 .to("mock:bean");
>
> I currently only say "Validation failed" in the body in the case of a
> PredicateValdiationException thrown. I would like to return a customized
> human readable message though depending on each failure. So if the first
> validate fails, I would like the reply to say "External ID must be greater
> than 0" and if the second validate fails "Trade not found in trades table".
>
> Is this possible with the Validate DSL?
>
> Thanks
>
>
>
> --
> View this message in context: http://camel.465427.n5.nabble.com/Validate-DSL-and-message-returned-to-client-tp5768293.html
> Sent from the Camel - Users mailing list archive at Nabble.com.



-- 
Claus Ibsen
-----------------
Red Hat, Inc.
Email: cibsen@redhat.com
Twitter: davsclaus
Blog: http://davsclaus.com
Author of Camel in Action: http://www.manning.com/ibsen
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