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The first route returns a unique list of vehicles, and is leveraged by the Make list in the form example. The second route returns a list of vehicle models of a particular make and is used by the Model list. When the model list requests the data, it is expected to pass the desired make along in the request to return only the models of interest. Be sure to test the routes directly, outside of a form to ensure they are working as expected. It's much easy to troubleshoot route issues in this way.
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If your lists contain large data sets with hundreds or thousands of entries, this approach may not be viable. Large dynamic lists may require more complex handling that what is described in this example. |
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