如何获取 Firestore 文档中的嵌套地图字段

Question

I've been using Firestore in Firebase and for now i've been able to extract the whole document but I can't extract one of the variables (for example, latitude):

And here is my code that works (JavaScript with React Native and Expo):

let cityRef = db.collection('pacientes').doc('paciente-test');
let getDoc = cityRef.get()
.then(doc => {
if (!doc.exists) {
  console.log('No such document!');
} else {
  console.log(doc.id, " => ", doc.data());
}
})
.catch(err => {
console.log('Error getting document', err);
})

I tried many things with doc.data(), like doc.data().latitude (with an undefined output) but whenever I change it, it doesn't compile. I've seen other solutions around but they don't work for me for some reason. If you think I've missed any info that could be more helpful let me know

Answer 1

Your document contains a single field called "safeArea" which has nested properties. You have to reference those nested properties as object properties in the "safeArea" object, like this:

doc.data().safeArea.latitude