reducer-helper.ts

import {IActionStatus} from '../models/common'

export default function updateStatus(status: {[action: string]: IActionStatus},
                                     field: string,
                                     type: 'init' | 'success' | 'fail',
                                     payload: any) {
  switch (type) {
    case 'init':
      return {
        ...status,
        [field]: {
          ...status[field],
          loading: true,
          loaded: false,
          success: false,
          error: null
        }
      }
    case 'success':
      return {
        ...status,
        [field]: {
          ...status[field],
          loading: false,
          loaded: true,
          success: true,
          error: null
        }
      }
    case 'fail':
      return {
        ...status,
        [field]: {
          ...status[field],
          loading: false,
          loaded: false,
          success: false,
          error: payload.error
        }
      }
  }
}
/* Example
     case actions.LOGIN:
      return {...state, status: updateStatus(state.status, 'login', 'init', action.payload)}
    case actions.LOGIN_SUCCESS:
      return {...state, status: updateStatus(state.status, 'login', 'success', action.payload)}
    case actions.LOGIN_FAIL:
      return {...state, status: updateStatus(state.status, 'login', 'fail', action.payload)}
*/