nicolaferraro commented on issue #631:
URL: https://github.com/apache/camel-k-runtime/issues/631#issuecomment-792576379
> I wonder if we need something like this with route template DSL
>
> ```
>
routeTemplate("myTemplate").templateParameter("foo").templateOptionalParameter("maxKeep")
> .from("direct:{{foo}}")
> .to("mock:result?retainFirst={{maxKeep}}");
> ```
>
> As then you make it standout in the parameter definitions in the top which
are required, and which are optional.
>
> Then in the route DSL you just use {{key}} where its in use. Then you dont
need to remember to use ? for optional. However this requires camel-core to
transform the DSL by automatic replacing `{{maxKeep}}` to `{{?maxKeep}}` as it
was declared as optional. And for this I need to add a new hook into the
properties component
I think there's in place a mechanism by which all required parameters are
checked in the Kamelet runtime, so having parameters marked as optional could
help implementing such check correctly. Otherwise the runtime will still reject
an instance if we don't provide a value for a param.
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