Hi,
I have some trouble passing parameters to a function in one of my
CommonScripts file.
Here's what I do:
As part of a specific view I want to output a subview and pass it a
parameter that might or might not be set. That's why I pass it using
the ? prefix:
<% OutputSubView("/shared/result", {...@result: ?Result}) %>
In /shared/result.brail I use the provider "Result" parameter (which
can be the real object or an IgnoreNull) and need to pass a property
of it to a function in my CommonScripts library. For example:
<% choice(result.IsSuccess,"another arg", "yet another")%>
The method looks like this:
def choice(isSuccess as bool, anotherArg as string, moreArgs as
string):
// stuff
end
The problem is that even if the "result" parameter is correctly
assigned to an object (I check that), it and all it's properties are
IgnoreNull values, so whenever I invoke the "choice" method like above
I get an error:
Unable to cast object of type 'Castle.MonoRail.Views.Brail.IgnoreNull'
to type 'System.IConvertible'.
[InvalidCastException: Unable to cast object of type
'Castle.MonoRail.Views.Brail.IgnoreNull' to type
'System.IConvertible'.]
Boo.Lang.Runtime.RuntimeServices.CheckNumericPromotion(Object
value) +46
Boo.Lang.Runtime.RuntimeServices.UnboxBoolean(Object value) +130
BrailView_result.Run() +141
The offending line in the compiled code is:
this.OutputEscaped(CommonModule.choice(RuntimeServices.UnboxBoolean
(ExpandDuckTypedExpressions_WorkaroundForDuplicateVirtualMethods.GetProperty
(this.GetParameter("result"), "IsSuccess")), "success", "error"));
While can comprehend why the error occurs (a IgnoreNull isn't a
boolean) I'd like to know whether I can do anything to prevent it. Can
IgnoreNull somehow transparently be converted to it's target?
I've found two work arounds:
1) don't pass result.IsSuccess but Convert.ToBoolean
(result.IsSuccess.ToString()) - pretty ugly
2) "unwrap" the IgnoreNull before use:
result = IgnoreNull.ExtractTarget(result)
Is there any easier way to handle this?
Regards,
Andre
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