How do I set a default value in a UI Forms field using a macro on create?

I have got a UI edit form for a custom module class with a UserID as one of the fields. This field uses a selector using a dropdown with the users in the database.

What I want is setting the default value to the current UserID, and preferably not showing the selector at all, only for administrators.

I cannot figure out how to do this. Tried a bit with Macro's but that didn't work. Of course I browsed through the docs, but couldn't find any help there.

Environment

Answers

Accepted answer

In your "Create" class for your custom module you can override the SetFormData(infoObject, IFormFieldValueProvider) method.

Something like so:

protected override Task SetFormData(ProductModelInfo infoObject, IFormFieldValueProvider fieldValueProvider)
{
    // default the order to be last in the list
    var productType = ProductModelInfo.Provider.Get()
        .Column(nameof(ProductModelInfo.ProductModelOrder))
        .OrderByDescending(nameof(ProductModelInfo.ProductModelOrder))
        .FirstOrDefault();
        
    // set the order of the new item to order + 1
    if (productType != null) infoObject.ProductModelOrder = productType.ProductModelOrder + 1;

    return base.SetFormData(infoObject, fieldValueProvider);
}

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