How to prevent candid remove duplicated type

Developers
1

I have a issue that I have 3 enum in rust have similar value but it is different enities

pub enum IntentState { Created, Processing, Success, Fail }
pub enum ActionState { Created, Processing, Success, Fail }
pub enum TxState { Created, Processing, Success, Fail }

when I run extract-candid it will only generate IntentState - I assume candid will remove duplicate value and mapping to only one type

type IntentState = variant { Fail; Success; Processing; Created };

type ActionDto = record {
  ...
  state : IntentState; // this should be ActionState
};

type TxDto = record {
  ...
  state : IntentState; // this should be TxState
};

How to avoid this?

2

Candid uses structural typing, meaning that if two types have the same fields they are the same type to Candid, even if you call them differently.

candid-extractor just does its thing. If you want to have the different types listed, you need to write the .did file by hand, which I would recommend anyways.

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3

Not a direct answer to your question but, looking at it from another way around, if the states are indeed similar, you can maybe approach it by having a common enum? This way by extension your DID file won’t reference a keyword that feels unrelated?

pub enum State { Created, Processing, Success, Fail }
pub type IntentState = State;
pub type ActionState = State;
pub type TxState = State;

Which would output:

type State = variant { Fail; Success; Processing; Created };

type ActionDto = record {
  ...
  state : State;
};

type TxDto = record {
  ...
  state : State;
};

Unless of course you really needs different enum, in that case never mind this post!

2 Likes