인프런 커뮤니티 질문&답변

reducer code

        case ADD_COMMENT_SUCCESS: {
            const postIndex = state.mainPosts.findIndex(v => v.id === action.data.postId);
            const post = state.mainPosts[postIndex];
            const Comments = [...post.Comments, action.data.comment];
            const mainPosts = [...state.mainPosts];
            mainPosts[postIndex] = { ...post, Comments };
            return {
                ...state,
                isAddingComment: false,
                mainPosts,
                commentAdded: true,
            };
        }

const Comments = [...post.Comments, action.data.comment];

git: https://github.com/hyunsokstar/node_bird_33

https://github.com/hyunsokstar/node_bird_33/blob/master/front/reducers/post.js

https://github.com/hyunsokstar/node_bird_33/blob/master/front/components/PostCard.js

에러가 발생하는 이유를 몰겠어요

const postIndex = state.mainPosts.findIndex(v => v.id === action.data.postId);

에 아이디가 없나 해서 찾아봤는데 그것도 아닌거 같아요