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Exception while doing calculations in the template with JsonObject as a model #760

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@denisbredikhin

Hello,

I have following lines in my template:

"TotalGuaranteePrice": {% assign total_price = 0 %} {% for guarantee in RiscObject[0].GaranteeObject %} {% assign total_price = total_price | plus: guarantee.Price %} {% endfor %} {{ total_price }},

As a model in the context I use JsonObject:

var data = await JsonObject.ParseAsync(stream); var context = new Fluid.TemplateContext(data);
When I try to render, I get the following error:
System.InvalidCastException: 'Unable to cast object of type 'System.Text.Json.Nodes.JsonValuePrimitive1[System.Text.Json.JsonElement]' to type 'System.IConvertible'.'`

I can solve it by adding the following:
options.ValueConverters.Add((value) => value is JsonValue jsonValue && jsonValue.GetValueKind()==JsonValueKind.Number ? jsonValue.GetValue<decimal>() : null);

Can you please implement standard support of JsonValue in calculations?

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