How To represent the following flow

[ibrahimkteish]

Hello All,

In my project I start using a back-port (iOS 10+) version of the composable architecture, I have a question on how to design the following flow.

Flow B and C are mutual exclusive so for them I represented the state as Enum

enum SubFlow: Equatable {
case flowB(FlowBStructState)
case flowC(FlowCStructState)
}
//....

let subFlowReducer = .init { state, action, env in ... }

every thing working as expected. Now I want to continue refactoring the code to create a flow reducer for all 3 flows. The question is should FlowA be another case in my enum or a struct holding a optional property of type SubFlow as the following

struct Flow {
var prop1: String,
var prop2: Int
var subFlow: SubFlow?
}

I would appreciate if someone can help me design this in the best way.

[surajbarkale]

This is how I would model it:

enum SubFlow: Equatable {
  case flowB(FlowBState)
  case flowC(FlowCState)
}

struct FlowState: Equatable {
  var flowA: FlowAState
  var subFlow: SubFlow?
}

let flowReducer = Reducer<FlowState, FlowAction, FlowEnvironment>.combine(
  flowAReducer.pullback(\.flowA, /FlowAction.flowA, \.flowA),
  flowBReducer
    .pullback(/SubFlow.flowB, \.self, \.self)
    .pullback(\.subFlow, /FlowAction.flowB, \.flowB),
  flowCReducer
    .pullback(/SubFlow.flowC, \.self, \.self)
    .pullback(\.subFlow, /FlowAction.flowC, \.flowC),
  Reducer { state, action, environment in
    ...
  }
)