Difference between interface keys and contract keys? Why do we need interface keys?

code_monkey · October 5, 2022, 6:54pm

Can somebody explain the gibberish in this paragraph?

– Type synonym for Reference. This type is currently used as a work-around given the lack of interface keys.

type R = Reference

– HIDE

– This template is used to key an Account contract. It allows for looking up this contract|
– by key then acquiring the Account contract by fetching its contract id on this contract.|
– As updates are made to an Account, this Reference contract is required to be kept in sync.|
template Reference

github.com

digital-asset/daml-finance/blob/0687d78cdccf9eb113d5245f2e860a05ea5a1c61/src/main/daml/Daml/Finance/Interface/Account/Account.daml#L132


      
              do
                creditAndDebit this arg
          
          
-- | Type constraint for requiring templates to implement `Account` along with `Disclosure`.
          type Implementation t = (HasToInterface t I, Disclosure.Implementation t)
          instance HasToInterface I Disclosure.I where _toInterface = asDisclosure
          class (Implementation t) => HasImplementation t
          instance HasImplementation I
          
          
-- | HIDE
          -- This template is used to key an Account contract. It allows for looking up this contract
          -- by key then acquiring the Account contract by fetching its contract id on this contract.
          -- As updates are made to an Account, this Reference contract is required to be kept in sync.
          template Reference
            with
              accountView : View
                -- ^ The default view for accounts.
              cid : ContractId Account
                -- ^ The contract id of the account.
              observers : PartiesMap
            where

Topic		Replies	Views
How to type cast one interface into another? Questions daml , damlhub	3	307	November 1, 2022
How to fetch a contract using its key - in a late binding fashion? Questions daml	10	153	December 20, 2023
Create Copy of Contract using Interface Reference Questions	1	152	November 14, 2022
What is the viewtype for interfaces mean? Questions daml	13	395	November 28, 2022
Contract Keys and equality Questions daml	2	315	May 28, 2020

Difference between interface keys and contract keys? Why do we need interface keys?

Related topics