New model BinarySpec property is not readable

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5

I made it work, but I don’t understand how or why just yet. I think it has to do with creation rules vs. mutation rules. At first I had:

model {
    components {
        juiceComponent(JuiceComponent) {
            binaries {
                juice(JuicerBinarySpec) {  // This is a creation rule
                    args = ['a', 'b']
                }
            }
        }
    }
}

And this code:

@BinaryTasks
void generateTasks(ModelMap<Task> tasks, final JuiceBinarySpec binary) {
    tasks.create("${binary.name}Juicer", JuicerTask) { task ->
        task.args = binary.getArgs()
    }
}

Would give me the not mutable exception (Cannot set value for model element ‘components.juiceComponent.binaries.juicer.args’ as this element is not mutable.).

But after I changed the creation rule to a mutation rule in the DSL like so:

model {
    components {
        juiceComponent(JuiceComponent) {
            binaries {
                juicer {  // This is now a mutation rule
                    args = ['a', 'b']
                }
            }
        }
    }
}

Then the exception went away. So now I wonder, how do I assign values to task inputs when a creation rule is used?