Create parent and child in a single batch

[lud]

Hello,

I would like to create initial data from a template. But I want it to be transactional, I don't want to have only the parent then a failure, or only a part of the children.

So far I have done this and it seems to work:

function createFromTemplate(database: Database, index: number) {
  const template: Template = TEMPLATES[index]
  
  return database.write(async () => {
    const posts = await database.get('posts')
    const comments = await database.get('comments')
    
    const postOp = posts.prepareCreate((post) => {
      post.name = template.name
      post.steps = template.steps
    })
    
    const commentOps = template.comments.map(raw => comments.prepareCreate((comment) => {
      comment.name = raw.name
      comment.step = raw.step
      comment.post.set(postOp._raw)
    }))

    await database.batch([postOp, ...commentOps])
  })
}

But I am not sure of the correctness. Will that be transactional? Notably, usage of _raw seems off.

Thank you.