The same result - always false (actually 'False')

variant.GetPropertyValue("currentlyUnavailable")

Are you able to look into the cmsPropertyData DB table and try and find the stored value? It'll be interesting to see if it's a problem saving it, or a problem retreiving it.

In the Variant JSON, it is stored as

"currentlyUnavailable": "1",

Ok, so it is being stored ok. And does it all work ok in the back office? it remembers the value etc when you move to and from a product?

Yes, the back office works OK.

I have managed to get the data value by overriding the Variant class (ModelsBuilder):

    [ImplementPropertyType("currentlyUnavailable")]
    public bool CurrentlyUnavailable
    {
        get
        {
            var rawVal = Properties.FirstOrDefault(t => t.PropertyTypeAlias == "currentlyUnavailable");
            if (rawVal == null) return false;

            return (rawVal.DataValue.ToString() == "1");
        }
    }

Which is OK, but it just means I have to create a Variant object just to get the value of the checkboxes.

Ahh, ok, so this is via ModelsBuilder. How are you actually getting your variant? I'm intregued how you are actually using it with ModelsBuilder 🤔

I get all variants for the product using

var variants = TC.GetVariants(storeId, productPage).ToList();

then loop through using

                    foreach (var variant in variants)

Currently, I need to create a Variant

                        var  varRecord = new Variant(variant);

(although I could have the previously mentioned code in-line, I suppose)

So, the first version works but the second doesn't

var unavail = varRecord.CurrentlyUnavailable;
var unavail = variant.GetPropertyValue<bool>("currentlyUnavailable");

In the end, what I have now is working and looks cleaner, but TC does appear to have a problem getting the value for a checkbox.

Strange. I'll try and replicate it this evening and see what I can find.

Typical. I've just tested this on my local demo install (Umbraco 7.12.4 though) and this worked as it should.

Add checkbox to variants doctype

Add property to variants data type as extra info

Set values on variants

Loop through variants in template

Output values of onSale property to screen

Yes, typical indeed! At least I have a method for making it work, so I'll carry on with that.

Thanks for your help.

No problem. Sorry I couldn't track it down for you, but glad you at least have a workaround.