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cortex's Issues

Give a nice error message if I use an accessor instead of with...()

I wrote in my query:
query.forRoot<Build>( new Build().on())
intending to ask for the repo of the build.

I got an exception:
Caused by: javax.script.ScriptException: TypeError: Cannot read property "nodeTags" from undefined in .atomist/handlers/event/FailedBuild.js at line number 90
... lots of other exception ick...

What I was supposed to write is:

query.forRoot<Build>( new BuildStub().withOn(new RepoStub())))

Please make the accessor methods like Build.on() throw an informative exception like "If you are trying to build a query by example, use withOn to ask for the repo" IF the internal property is undefined.
(Rod says that if we've set the property earlier in the program, we should be able to retrieve it; but if it's still undefined then this isn't a valid access and we can provide the informative exception in the generated code.)

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