I am in the process of upgrading an outdated JavaScript Express application to a new TypeScript application. I have encountered an issue with typing during the populate process.
/* This function acts like middleware after creating our schema, allowing us to access 'next' */
/* It needs to be a function declaration (not an arrow function) so we can use 'this' to refer to our schema */
const autoPopulatePostedBy = function (next) {
this.populate('postedBy', '_id username avatar');
this.populate('comments.postedBy', '_id username avatar');
next();
};
/* We need to populate the 'postedBy' field almost every time we perform a findOne/find query, so we'll set it up as a pre hook when creating the schema */
postSchema.pre<IPostSchema>('findOne', autoPopulatePostedBy).pre<IPostSchema>('find', autoPopulatePostedBy);
/* Create index on keys for more performant querying/post sorting */
postSchema.index({ postedBy: 1, createdAt: 1 });
export default model<IPostSchema>('Post', postSchema);
I am facing errors related to 'next' and 'this', TypeScript is indicating types as any and for pre.
Argument of type '"findOne"' is not assignable to parameter of type 'RegExp | MongooseDocumentMiddleware | MongooseDocumentMiddleware[]'
How can I resolve this issue?