"Cannot read property 'unshift' of undefined"

[Brightosman]

GRAPHQL > RESOLVERS > COMMENTS.JS

        if (post) {
        ** post.comments.unshift({ **
            body,
            username,
            createdAt: new Date().toISOString()
          });
          await post.save();
          return post;
        } else throw new UserInputError('Post not found');

[zhaiyuxin103]

models -> Post.js

const postSchema = new Schema({
  body: String,
  username: String,
  createdAt: String,
- comment: [
+ comments: [
    {
      body: String,
      username: String,
      createdAt: String,
    },
  ],
  likes: [
    {
      username: String,
      createdAt: String,
    },
  ],
  user: {
    type: Schema.Types.ObjectId,
    ref: "users",
  },
});