tx

tx gets specified documents first and manipulates them in succession.

delete field

await db.tx("users", "bob", ({ref, t, data}) => {
  t.update(ref, {age: data.age + 10})
})

// equivalent firestore
await fb.runTransaction(async (t) => {
  const ref = fb.collection("users").doc("bob")
  const result = await t.get(ref)
  const data = result.data()
  t.update(ref, {age: data.age + 10})
})