Note also that I'm giving each Zone "object" it's own :type property.
That's how I'm able to dispatch on the type. It also plays well with
multimethods.
On Saturday, March 5, 2016 at 7:26:27 PM UTC-5, Bobby Eickhoff wrote:
>
> It sounds like what you're describing is (structurally) an algebraic data
> type, i.e. a generic type with specific variants. I've been able to do
> something like this in my own projects. Here I'm considering Zone the
> general type and each variant is Zone:Hand, Zone:Deck, &c.
>
> (def Zone:Hand
> ...)
>
> (def Zone:Deck
> ...)
>
> (def Zone
> (s/conditional
> #(= (:type %) :Hand) Zone:Hand
> #(= (:type %) :Deck) Zone:Deck
> ...))
>
> Does that help?
>
> On Saturday, March 5, 2016 at 6:58:31 PM UTC-5, JvJ wrote:
>>
>> I've been using Schema, and there's a kind of type definition that I'm
>> having trouble with. I'm not sure exactly how to describe it, so I'll
>> provide an example.
>>
>> I'm working on a digital card game in which there are numerous zones that
>> a card may be in. Each card needs to know which zone it is in, and there
>> may be additional information depending on the zone.
>>
>> For instance, if a card is in a player's hand, no additional information
>> is required. However, if the card is on the board, it needs to understand
>> its position on the board.
>>
>> I have the following definition for zone types:
>>
>> (def Zone
>> "A schema for referring to the various game zones."
>> (s/enum :Hand
>> :Deck
>> :Board
>> :Field
>> :Discard
>> :Void))
>>
>> I want to define a different schema type for each of these, and then
>> define a zone spec:
>>
>> (def ZoneSpec {(required-key :zone-type) Zone
>> :data <zone data corresponding to the zone type
>> specified earlier>
>> })
>>
>> I want to ensure that whichever data is provided specified the schema
>> associated with the zone type.
>>
>> Is there a way to do this?
>>
>> Thanks.
>>
>
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