Flex :: Avoiding Duplicate Data & Calculations In View-models?
Jul 26, 2011
I'm working on a Flex application that uses MVVM. I understand that it's recommended to have a 1-to-1 mapping between views and view-models. How then do I avoid performing the same calculations and storing the same data multiple times if it is needed in multiple views?
For example, imagine I have a program that can load project files consisting of a list of items. The main tab of my application has an export button that should only be enabled if the project is valid so I create an isExportEnabled property on the view-model for the main tab. The calculation for this involves validating the project by iterating though every item in the project and verifying some attribute on each. I have another tab which has a "Print Project Summary" button so the view-model for this tab has isPrintEnabled. The value for this flag is based on the same criteria, whether or not the project is valid.
I could put the logic for determining these values in their respective view-models, but then I end up calculating the same value twice when a project is loaded. I could move isValid to the domain model but then the model becomes denormalized. What if a saved project is edited without updating the "isValid" flag? I could make a global "Project View-Model" for the entire project which calculates whether the project is valid and then have isExportEnabled and isPrintEnabled delegate to that. However, then I end up with a hierarchy of view-models which this article recommends avoiding: Applying the Presentation Model in Flex
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