Writer in Model to create objects

[andrepaulo-bit]

In: https://nozbe.github.io/WatermelonDB/Writers.html it says:

We highly recommend defining writer methods on Models to organize all code that changes the database in one place, and only use inline writers sporadically.

How can I create the writer to create an object?

[fullstackNRJ]

Inside your model class just use @writer decorator on your async function.
@writer async addComment(body, author) { const newComment = await this.collections.get('comments').create(comment => { comment.post.set(this) comment.author.set(author) comment.body = body }) return newComment }

In you async function you get the table by passing name and call create method on it, this create method has a comment object which you can use to set or assign values to each of the required field, as you can see in the code.
Now, you can call addComment method directly from your model object. Something like
Comment.addComment(arg1, arg2)