javascript - 如何合并属于Reducer的对象内的对象属性

Question

我正在尝试使用“评论”对象实现一个 reducer ，该对象包含由某个 ID 索引的评论数组。我想合并而不是替换“comments”对象内的属性。

现在我有这个:

commentsReducer {
   comments: {}
   1: Array[9]
   2: Array[5]
   isFetchingComments: true
   lastUpdated: null
}

我的Reducer函数:

function commentsReducer(state = {
   isFetchingComments: false,
   lastUpdated: null,
   comments : {}
   },action){

  switch(action.type){      
    case RECEIVE_COMMENTS:
      var new_cm = {[action.pid]: action.comments};
      return Object.assign({}, state, new_cm); 

  }
}

我正在尝试做的事情:

commentsReducer {
   comments { 
      1: Array[9],
      2: Array[5]
   }
   isFetchingComments: true
   lastUpdated: null
}

Answer 1

改变

var new_cm = {comments:{[action.pid]: action.comments}};

它应该可以解决问题

编辑

如果您想添加更多评论，那么

var new_cm = {comments: Object.assign({}, state.comments, {[action.pid]: action.comments})};