In my Firestore database, the structure includes multiple arrays within the "reserved items" object. Each array contains more than one element. How can I extract the "returnDate" element from every single array within the object?
In my Firestore database, the structure includes multiple arrays within the "reserved items" object. Each array contains more than one element. How can I extract the "returnDate" element from every single array within the object?
reserved_items is a field with type Array, where each element is a map or JavaScript Object. To access the elements of this Array, you will need to iterate over it using the dot notation concept. Below is an example utilizing the dot notation along with the forEach() method:
var documentReference = db.collection('...').doc('63ufq....');
documentReference
.get()
.then((document) => {
if (document.exists) {
const reserved_items = document.get('reserved_items');
reserved_items.forEach(item => console.log(item.returnDate));
} else {
// Undefined document data
console.log('Document does not exist!');
}
})
.catch((error) => {
console.log('Error retrieving document:', error);
});
To begin, retrieve your file from your firestore database.
var docRef = db.collection("cities").doc("SF");
docRef.get().then((doc) => {
if (doc.exists) {
console.log("Document content:", doc.data());
} else {
// doc.data() will be undefined in this scenario
console.log("Document not found!");
}
}).catch((error) => {
console.log("Error retrieving document:", error);
});
At this point, you will find your data inside doc.data(), with 'reserved_items' as one of its properties. You can then utilize the map() function to loop through 'reserved_items' and save the required information in a variable.
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