Why react not rendering updated state?-CodePudding

I have a community feature in my application in which users can post their comments.I want to toggle the state of visibility of a comment when clicked on a particular icon. Icon:

 <i className="fa-solid fa-message" onClick={(e)=>handleComment(e)}></i>
        {!props.post.isCommentVisible && <> <Container maxW="md" centerContent p={8}>
          {props.post.comment.map((comm) => (
            <Text>{comm}</Text>
          ))}

The function to toggle the visiblity of ccomment is:

function handleComment(e)
  {
    const id=props.post.id;
    posts.map((post)=>{
      if(post.id==id)
      {
       if(post.isCommentVisible=="false")
       {
         post.isCommentVisible="true";
       }
       else
       {
        post.isCommentVisible="false";
       }
         
         
       db.collection("posts").doc(id).set(post);
      }
    })

  }

Interestingly the state of visibility of comment is updated but react is not rerendering the changed state.

CodePudding user response：

Whether props.post.isCommentVisible is "true" or "false" the expression !props.post.isCommentVisible will always be false because "anyString" is always true.

CodePudding user response：

Assuming somewhere you defined:

const [posts, setPosts] = useState([]);

And then updated populated posts via some fetch operation, you have to call setPosts like:

setPosts(
    posts.map((x) => ({
        ...x,
        isCommentVisible:
            x.id === post.id ? !x.isCommentVisible : x.isCommentVisible,
    }))
);

(use any method you want to achieve the result, mind the comment by Rocky Sims)

This will cause the re-render.