multiple.reducers.case.js

// Action creator: dispatched from the thunk or whatever
const successAction = (entityId, data) => ({
  type: UPDATE_SUCCEEDED,
  entityId,
  data,
});

// Changes in the app state:

// Action handler -> ui/unitStore: resetting UI unit state
const onSuccess = {
  [UPDATE_SUCCEEDED]: () => initialState,
};

// Action handler -> data/entitiesStore: updating entity in the data store
const updateEntityOnEdit = {
  [UPDATE_SUCCEEDED]:
    (state, { entityId, data }) =>
      state.mergeIn(['entities', entityId], data),
};

// Failure handlers, thunks, etc...

// --- Exports

// Imported to the UI unit reducer
export const onServerStateUpdate = {
  ...onRequest, // showing spinner
  ...onSuccess, // resetting state
  ...onFailure, // handling errors
};

// Imported to the data store reducer
export { updateEntityOnEdit };