Firestore Conditional Where Clause Using Modular SDK V9

How to perform a query with conditional where() clause using Firebase Modular SDK (v9)? Example query in name-spaced version (v8): const status = 'live' const publishedAfter = 1630

Solution 1:

Option 1: Conditionally adding QueryConstraint using previous as base

let q = query(collection(firestore, "articles"))

// filters selected by users
if (status) q = query(q, where("status", "==", "live"))
if (publishedAfter) q = query(q, where("publishedAt", ">", publishedAfter))

const qSnapshot = await getDocs(q);

Option 2: Conditionally adding QueryConstraints to an array

const constraints = []

// filters selected by users
if (status) constraints.push(where("status", "==", "live"))
if (publishedAfter) constraints.push(where("publishedAt", ">", publishedAfter))

const q = query(collection(firestore, "articles"), ...constraints)

const qSnapshot = await getDocs(q);