Craft Reducer Template

import { Map } from 'immutable';
import { createSelector } from 'reselect';

/**
 * Action Types
 */
export const types = {
  REQUESTLIST_FETCH_START: 'REQUESTLIST/FETCH_START',
  REQUESTLIST_FETCH_SUCCESS: 'REQUESTLIST/FETCH_SUCCESS',
  REQUESTLIST_FETCH_FAILURE: 'REQUESTLIST/FETCH_FAILURE'
};

/**
 * Initial State for Reducer
 */
export const initialState = Map({
  loading: false,
  error: null,
  entities: Map()
});

/**
 * Reducer
 */
export default function requestListReducer(state = initialState, action) {
  switch (action.type) {
    case types.REQUESTLIST_FETCH_START:
      return state.set('loading', true).set('error', false);

    case types.REQUESTLIST_FETCH_SUCCESS:
      return state.set('loading', false).set('entities', action.payload);

    case types.REQUESTLIST_FETCH_FAILURE:
      return state.set('loading', false).set('error', Map(action.payload));

    default:
      return state;
  }
}

/**
 * Actions
 */
export const actions = {
  loadRequestList: queryParams => ({
    type: types.REQUESTLIST_FETCH_START,
    payload: queryParams
  })
};

/**
 * Selectors
 */
export const getRequestList = createSelector(
  state => state.get('requestList'),
  requestList => requestList
);

export const getRequestDetails = createSelector(
  state => state.getIn(['requestList', 'requestDetails']),
  requestList => requestList
);