If a Firestore document has a field "tags" with value ["cloud", "database"], what will a query filtering documents where "tags" array contains "cloud" return?

medium📝 Predict Output Q5 of 15

GCP - Cloud Firestore and Bigtable

AIt will return documents only if "tags" is a string

BIt will return the document because "cloud" is in the tags array

CIt will return no documents because arrays cannot be queried

DIt will cause a runtime error

Step-by-Step Solution

Solution:

Step 1: Understand array-contains query
Firestore supports querying array fields to check if they contain a specific value.
Step 2: Check document's tags field
The document's "tags" array includes "cloud", so it matches the query.
Final Answer:
It will return the document because "cloud" is in the tags array -> Option B
Quick Check:
Array contains query matches documents with value in array [OK]

Quick Trick: Use array-contains to find values inside array fields [OK]

Common Mistakes:

Believing arrays can't be queried
Confusing array with string fields
Expecting errors on valid queries

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More GCP Quizzes

If a Firestore document has a field "tags" with value ["cloud", "database"], what will a query filtering documents where "tags" array contains "cloud" return?

Step 1: Understand array-contains query

Step 2: Check document's tags field

Final Answer:

Quick Check:

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