How to get a document from a collection based on a particular field in that document

问题

const docRef = firestore.collection("orders").document("")

I need to get the document "147OiRKFYKA3WAo5d5mk" if the field value is Admno:"11.11.1111"

here is my database

Thankyou for the help.

回答1:

This case is mentioned in the official Firestore documentation:

db.collection("orders").where("Admno", "==", "11.11.1111")
    .get()
    .then(function(querySnapshot) {
        querySnapshot.forEach(function(doc) {
            console.log(doc.id, " => ", doc.data()); //here's your doc
        });
    })
    .catch(function(error) {
        console.log("Error getting documents: ", error);
    });

I strongly recommend reading the documentation if you're getting started with Firestore.

来源：https://stackoverflow.com/questions/48247511/how-to-get-a-document-from-a-collection-based-on-a-particular-field-in-that-docu