Using existing reducers unclear

[daronjay]

I am trying to add react-redux-forms into an existing implementation. I want to be able to use a custom reducer for my form that has access to the model data. I see in the documentation you suggest this approach, replacing CombineReducer with CombineForms

import myCustomReducer from './myCustomReducer.js';

const store = createStore(combineForms({
  user: initialUser,
  goat: initialGoat,
  custom: myCustomReducer, // 
My trouble is I have an existing setup like this:
import allOtherAppReducers from './allOtherAppReducers.js'

const store = createStore(
    combineReducers({
      ...allOtherAppReducers,
      apollo: apolloClient.reducer(),
      ...createForms({
        formData: {}
      })
    }),
    {},
    composeEnhancers(applyMiddleware(...middlewares))
  );
If it use createForms like that, then the formData gets updated and persisted automatically, but I can't get at it with my reducers.
If I set it up like this:
import allOtherAppReducers from './allTheOtherAppReducers.js'
import myCustomFormDataReducer from './myCustomFormDataReducer.js'

const store = createStore(
    combineForms({
      ...allOtherAppReducers,
      apollo: apolloClient.reducer(),
      formData: myCustomReducer
      })
    }),
    {},
    composeEnhancers(applyMiddleware(...middlewares))
  );
then everything in the entire application gets "modelled". How should I go about this?

[daronjay]

I seem to have got it going using this syntax:

import allOtherAppReducers from './allTheOtherAppReducers.js'
import myCustomFormDataReducer from './myCustomFormDataReducer.js'


  const store = createStore(
    combineReducers({
      ...allOtherAppReducers,
      apollo: apolloClient.reducer(),
      ...createForms({
        formData: myCustomFormDataReducer
      })
    }),
    {},
    composeEnhancers(applyMiddleware(...middlewares))
  );

It's not clear to me from the documentation that you can do the same sort of injection of a custom reducer in createForms as you can in combineForms. I wonder if the documentation needs an update, (assuming I actually have it right)

[partisanyc]

I also struggled with this. The documentation does state that you can use a custom reducer, but it doesn't tell you why you would or what the effect of doing that would be. I'm new to react, redux, and forms so I just chalked it up to lack of experience, but I am glad to hear I am not the only one who has faced the issue.