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redux-docs-async-reducer.js

// adapted from http://redux.js.org/docs/advanced/AsyncActions.html#reducersjs

import {
  REQUEST_POSTS,
  RECEIVE_POSTS
} from '../actions'

function postsReducer(
  state = {
    isFetching: false,
    items: []
  },
  action
) {
  switch (action.type) {
    case REQUEST_POSTS:
      return Object.assign({}, state, {
        isFetching: true,
        didInvalidate: false
      })
    case RECEIVE_POSTS:
      return Object.assign({}, state, {
        isFetching: false,
        didInvalidate: false,
        items: action.posts,
        lastUpdated: action.receivedAt
      })
    default:
      return state
  }
}