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Reduxでdispatchしてもstoreが更新されない時はreducerを確認

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dispathcしているのにstoreが更新されない時

< もともと書いていたReducer>

export default function postListReducer(state = [], action) {
  switch (action.type) {
    case ActionType.FETCH_POST_LIST:
      return action.postList.reduce((accumulator, currentV) => {
        accumulator.push(currentV);
          return accumulator;
       }, state);
    default:
      return state;
  }
}

< 修正したReducer >

export default function postListReducer(state = [], action) {
  switch (action.type) {
    case ActionType.FETCH_POST_LIST:
      return [...state, ...action.postList];
    default:
      return state;
  }
}

元のコードだともともとのstateを変更してしまっています。
Reducerでは新規にオブジェクトや配列を返す必要があるので、正しく動作していませんでした。
(State自体は変更されるが、componentWillReceivePropsが動作しない。)

以上。

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