Redux News Reader

commentList.js

import React from 'react';
import Comment from './Comment';

export default function CommentList({ comments }) {
  if (!comments) {
    return null;
  }
  
  return (
    <ul className='comments-list'>
      {comments.map(comment => {
        return <Comment comment={comment}/>
      })}
    </ul>
  );
}

Comments.js

import React, { useEffect } from 'react';
import { useDispatch, useSelector } from 'react-redux';
import {
  loadCommentsForArticleId,
  selectComments,
  isLoadingComments,
} from '../comments/commentsSlice';
import { selectCurrentArticle } from '../currentArticle/currentArticleSlice';
import CommentList from '../../components/CommentList';
import CommentForm from '../../components/CommentForm';

const Comments = () => {
  const dispatch = useDispatch();
  const article = useSelector(selectCurrentArticle);

  // Declare additional selected data here.
  const comments = useSelector(selectComments);
  const commentsAreLoading = useSelector(isLoadingComments);

  // Dispatch loadCommentsForArticleId with useEffect here.
  useEffect(() => {
    article && dispatch(loadCommentsForArticleId(article.id));
  }, [dispatch, article]);

  const commentsForArticleId = article ? comments[article.id] : [];

  if (commentsAreLoading) return <div>Loading Comments</div>;
  if (!article) return null;

  return (
    <div className='comments-container'>
      <h3 className='comments-title'>Comments</h3>
      <CommentList comments={commentsForArticleId} />
      <CommentForm articleId={article.id} />
    </div>
  );
};

export default Comments;

commentsForm.js

import React, { useState } from 'react';
import { useDispatch, useSelector } from 'react-redux';
import {
  createCommentIsPending,
  postCommentForArticleId
} from '../features/comments/commentsSlice';

export default function CommentForm({ articleId }) {
  const dispatch = useDispatch();
  const [comment, setComment] = useState('');
  
  // Declare isCreatePending here.
  const isCreatePending = useSelector(createCommentIsPending);
  const handleSubmit = (e) => {
    e.preventDefault();
    // dispatch your asynchronous action here!
    dispatch(postCommentForArticleId({articleId, comment}));
    setComment('');
  };

  return (
    <form onSubmit={handleSubmit}>
      <label for='comment' className='label'>
        Add Comment:
      </label>
      <div id='input-container'>
        <input
          id='comment'
          value={comment}
          onChange={(e) => setComment(e.currentTarget.value)}
          type='text'
        />
        <button
          
          className='comment-button'
        >
          Submit
        </button>
      </div>
    </form>
  );
}

commentSlice.js

import { createAsyncThunk, createSlice } from "@reduxjs/toolkit";

export const loadCommentsForArticleId = createAsyncThunk(
  "comments/loadCommentsForArticleId",
  async (id) => {
    const data = await fetch(`api/articles/${id}/comments`);
    const json = await data.json();
    console.log(json);
    return json;
  }
);

export const postCommentForArticleId = createAsyncThunk(
  "comments/postCommentForArticleId",
  async ({ articleId, comment }) => {
    const requestBody = JSON.stringify({comment: comment});
    const response = await fetch(`api/articles/${articleId}/comments`, {
      method: "POST",
      body: requestBody,
    });
    const json = await response.json();
    return json;
  }
);

export const commentsSlice = createSlice({
  name: "comments",
  initialState: {
    // Add initial state properties here.
    byArticleId: {},
    isLoadingComments: false,
    failedToLoadComments: false,
    createCommentIsPending: false,
    failedToCreateComment: false,
  },
  // Add extraReducers here.
  extraReducers: (builder) => {
    builder
      .addCase(loadCommentsForArticleId.pending, (state) => {
        state.isLoadingComments = true;
        state.failedToLoadComments = false;
      })
      .addCase(loadCommentsForArticleId.fulfilled, (state, action) => {
        state.isLoadingComments = false;
        state.failedToLoadComments = false;
        state.byArticleId = {
          [action.payload.articleId]: action.payload.comments,
        };
      })
      .addCase(loadCommentsForArticleId.rejected, (state) => {
        state.isLoadingComments = false;
        state.failedToLoadComments = false;
      })
      .addCase(postCommentForArticleId.pending, (state, action) => {
        state.createCommentIsPending = true;
        state.failedToCreateComment = false;
      })
      .addCase(postCommentForArticleId.fulfilled, (state, action) => {
        state.byArticleId[action.payload.articleId].push(
          action.payload
        );
        state.createCommentIsPending = false;
        state.failedToCreateComment = false;
      })
      .addCase(postCommentForArticleId.rejected, (state, action) => {
        state.createCommentIsPending = false;
        state.failedToCreateComment = true;
      });
  },
});

export const selectComments = (state) => state.comments.byArticleId;
export const isLoadingComments = (state) => state.comments.isLoadingComments;
export const createCommentIsPending = (state) =>
  state.comments.createCommentIsPending;

export default commentsSlice.reducer;