// if id is for non-exist doc, client will generate new id
const cityRef = doc(db, 'cities', 'BJ')

setDoc(cityRef, { 
	capital: true,
	long: false,
	title: true
},
// see differences and apply delta, if doc is not exist create it
{ merge: true }
);

const deleteBookForm = document.querySelector(".delete")
deleteBookForm.addEventListener('submit', e => {
	e.preventDefault()

	const docRef = doc(db, 'books', deleteBookForm.id.value)
	deleteDoc(docRef)
	.then(() => {
		deleteBookForm.reset()
	})
	.catch((err) => {
		console.error(err.message)
	})
})