Tersus: Re: how to initialize a database?

Re: how to initialize a database? Date: May 4, 2010Tags:Type PropagationThe error message you quote applies to the <Done> exit of the Load Country Database action, warning that it has no type defined, while it should be of type Nothing. Note that the error should also appear while performing validation (which should occur by default when saving, see Window -> Preferences -> Tersus -> Validation).Every trigger and exit (generically called slots) in the model must have a type defined (see the dataTypeId property in the Properties view.There are various way in which a type can be set:

Slots added from the palette do not have a type by default

Templates with predefined slots usually have types defined for them in advance (except in cases where multiple types could apply)

A slot without a predefined type will be assigned a type when it is connected (using a flow arrow) to another slot (which has a data type defined already) or to a data element - this is called type propagation.

A slot can also be assigned a type (overriding another type if already defined) by dragging the relevant type (from the palette or repeository) and dropping it on the slot.

Thus, the easiest method to resolve the error is to drag a Nothing type from the palette over the <Done> exit. Other options would be:

Remove the exit altogether (unless the Load Country Database model is reused elsewhere and in that location a flow exits <Done>),

Replace the exit with a prefedined one by deleting it, and then right-clicking Load Country Database and selecting <Done> from the Add Element menu.

Regards,DavidSee Also:

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