Canton Console how to represent ENUM

Hi Team,

Similar to the questions that I raised last week from here .

Now, we are adding the complexity to the template as shown below (with partyType with Enum type)

data PartyType = Delegates | Entity deriving (Eq, Show)

template PartyInfo3
  with
    operator : Party -- party onboarding --
    referenceId : Map.Map Text Text
    partyType : PartyType
  where
    signatory operator

Looking at the sample contract from return, I understand that Enum is required but still puzzle to construct enumId & constructor part.

 label = "partyType",
              value = Some(
                value = Value(
                  sum = Enum(
                    value = Enum(
                      enumId = Some(value = Identifier(packageId = "fb64fe96f2f08c34e344864507e65b0aeb779e9c808f21e21dbb13059a9ebc02", moduleName = "PartyInfo", entityName = "PartyType")),
                      constructor = "Delegates"

Can you please help giving the example? thanks in advanced

Cheers,
Dorrit

Hi Dorrit,

You can instantiate the enum PartyType like this:

22:05:24 ~/repos/canton-1/enterprise/app/target/release/canton-enterprise-2.3.0-SNA
PSHOT [enum]
🌸 ./bin/canton -c examples/01-simple-topology/simple-topology.conf
   _____            _
  / ____|          | |
 | |     __ _ _ __ | |_ ___  _ __
 | |    / _` | '_ \| __/ _ \| '_ \
 | |___| (_| | | | | || (_) | | | |
  \_____\__,_|_| |_|\__\___/|_| |_|

  Welcome to Canton!
  Type `help` to get started. `exit` to leave.

@ import com.digitalasset.canton.examples.PhoTest.PartyInfo3
import com.digitalasset.canton.examples.PhoTest.PartyInfo3

@ import com.digitalasset.canton.examples.PhoTest.PartyType.Delegates
import com.digitalasset.canton.examples.PhoTest.PartyType.Delegates

@ import com.digitalasset.canton.examples.PhoTest.PartyType.Entity
import com.digitalasset.canton.examples.PhoTest.PartyType.Entity

@ import com.daml.ledger.client.binding.Primitive.GenMap
import com.daml.ledger.client.binding.Primitive.GenMap

@ import com.daml.ledger.client.binding.Primitive.Text
import com.daml.ledger.client.binding.Primitive.Text

@ 
val partyInfo3 = PartyInfo3(operator = operator.toPrim, referenceId = Map.empty[Tex
t,Text], partyType = Delegates)
partyInfo3: PartyInfo3 = PartyInfo3(
  operator = "operator::1220a01c682ce1d460746ec7175cac1d56effcea97060a8383d6abde2b9
c186baefd",
  referenceId = Map(),
  partyType = Delegates
)


@
val partyInfo3Again = PartyInfo3(operator = operator.toPrim, referenceId = Map.empty[Tex
t,Text], partyType = Entity)
partyInfo3: PartyInfo3 = PartyInfo3(
  operator = "operator::1220a01c682ce1d460746ec7175cac1d56effcea97060a8383d6abde2b9
c186baefd",
  referenceId = Map(),
  partyType = Entity
)

After this point you can do val create = partyInfo3.create.command etc to create the contract.

Does that answer your question?

Phoebe

Thanks Phoebe, is there a way that we don’t use binding library? Because client doesn’t want to use codegen?

Hi Dorrit,

You can do this without the binding library, yep. The important bit is

val createCmd = ledger_api_utils.create(pkgIdStr,"PhoTest","PartyInfo3",Map("operat
or" -> operator,"referenceId" -> Value.Sum.GenMap(GenMap.of(Seq.empty)),"partyType"
 -> Value.Sum.Enum(Enum(constructor = "Delegates"))))

Here is all the operations that make this work

🌸 ./bin/canton -c examples/01-simple-topology/simple-topology.conf
   _____            _
  / ____|          | |
 | |     __ _ _ __ | |_ ___  _ __
 | |    / _` | '_ \| __/ _ \| '_ \
 | |___| (_| | | | | || (_) | | | |
  \_____\__,_|_| |_|\__\___/|_| |_|

  Welcome to Canton!
  Type `help` to get started. `exit` to leave.


@
val pkgIdStr = "cee0a65ec62d682a2025935a28810dac8ad722ec3ff5593ed646eaf88ad8cc9f"
pkgIdStr: String = "cee0a65ec62d682a2025935a28810dac8ad722ec3ff5593ed646eaf88ad8cc9
f"

@ val operator = participant1.parties.enable("operator")
operator: PartyId = operator::12202818444d...

@ participant1.dars.upload("dars/CantonExamples.dar")
res7: String = "12201cc2b4b2d2cce61fb8ce2274c34f9aa0611457c510b0d09071c8ea4a8a09fd8
f"

@ import com.daml.ledger.api.v1.value.GenMap
import com.daml.ledger.api.v1.value.GenMap

@ import com.daml.ledger.api.v1.value.Value
import com.daml.ledger.api.v1.value.Value

@ import com.daml.ledger.api.v1.value.Enum
import com.daml.ledger.api.v1.value.Enum

@ participant1.domains.connect_local(mydomain)

@
val createCmd = ledger_api_utils.create(pkgIdStr,"PhoTest","PartyInfo3",Map("operat
or" -> operator,"referenceId" -> Value.Sum.GenMap(GenMap.of(Seq.empty)),"partyType"
 -> Value.Sum.Enum(Enum(constructor = "Delegates"))))
createCmd: com.daml.ledger.api.v1.commands.Command = Command(
  command = Create(
    value = CreateCommand(
      templateId = Some(
        value = Identifier(
          packageId = "cee0a65ec62d682a2025935a28810dac8ad722ec3ff5593ed646eaf88ad8cc9f"
... <<some more stuff>>>...
            RecordField(
              label = "partyType",
              value = Some(
                value = Value(
                  sum = Enum(
                    value = Enum(enumId = None, constructor = "Delegates")
                  )
...


@ participant1.ledger_api.commands.submit(Seq(operator), Seq(createCmd))
res31: com.daml.ledger.api.v1.transaction.TransactionTree = TransactionTree(
  transactionId = "122067e87bd5bfaf00ba8c7be021836738fcb3cd8d0173718bb3d1c638b80821
0a7d",
  commandId = "32d1b35f-4038-4129-bd71-692205617274",
  workflowId = "",
  effectiveAt = Some(
    value = Timestamp(
    ...

Does that work for you?

Phoebe

@Phoebe_Nichols Work perfectly! thanks for your help