OnUpdate features in Model schema about dynamodb-onetable HOT 3 CLOSED

So what OneTable calls value templates, toolbox calls default values. We use default to mean: if the property is null, use the default value.

Our value templates function similarly:

value: '${name}#${status}

OneTable will calculate default values on every update currently. So I think OneTable operates already the way you want, provided you pass the name and status properties in the update. If you omit any ingredient property for a value template, the value template will not be used.

I hope this clarifies it for you.

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Can you describe that in more detail?

Do you mean values that use "default: value" in the schema?

OneTable uses a default value on create and when reading an item for which the value has not yet been defined. But not for update, as the value should be already defined by either a default value, or the caller providing a non-default value. Can you explain why, and what constraints would an update use the default value?

Is your need when the schema default value changes, so you want to force an update?

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For me, it is mainly used for updating gsi. For example I can define a gsi with sort key as: name#status#date
and it is possible that the status/name attribute may change some time. As I worked with dynamodb-toolbox, it is provided with such feature, which allow me to update the status & name, and it will automatically also update the related gsi sort key e.g. with default=(data)=>${data.name}#${data.status}

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