Let's say you have a trip planning app where your users can fill out a form to create a new trip. You may want to have the user select a Trip Category via a dropdown so they have to pick "Adventure," "Leisure," or "Educational."
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To do this you need to make both a Trips collection and a Trip Categories collection.
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On the Trip collection, add properties for Name, Image, and User.
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Then, on the Trips collection, add a relationship property so that each Trip can be related to one Trip Category. Name the relationship property "Category"
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In the Trip Categories collection, add a Name Property.
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Then add Trip Category records for "Adventure," "Leisure," and "Educational"
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Now, add a new screen to your app
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Select the "Form" screen template
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Select the Form
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In the left panel, set the form to Create Trip
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Now, expand the Fields section
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Add the "Category" property to the Form Fields section
That's it! The Category field will automatically be a dropdown field on your form with "Adventure," "Leisure," and "Educational" as the three options.