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Fixed issue calling DataSnapshot methods with null data #1661

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Fixed issue calling DataSnapshot methods with null data #1661

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18b714b
Fixed issue calling DataSnapshot methods with null data (see firebase…
rhodgkins Jan 13, 2025
c573ff7
Added test cases for fix
rhodgkins Feb 5, 2025
bd23462
Better fix for calling DataSnapshot#val() with null data
rhodgkins Feb 5, 2025
a91c8f0
Merge branch 'master' into master
rhodgkins Aug 21, 2025
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11 changes: 11 additions & 0 deletions spec/v1/providers/database.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -494,20 +494,31 @@ describe("DataSnapshot", () => {
it("should deal with null-values appropriately", () => {
populate(null);
expect(subject.val()).to.be.null;
expect(subject.child("a").val()).to.be.null;
expect(subject.child("a/b").val()).to.be.null;

populate({ myKey: null });
expect(subject.val()).to.be.null;
expect(subject.child("myKey").val()).to.be.null;
expect(subject.child("myKey/a").val()).to.be.null;
expect(subject.child("myKey/a/b").val()).to.be.null;
expect(subject.child("a").val()).to.be.null;
expect(subject.child("a/b").val()).to.be.null;
});

it("should deal with empty object values appropriately", () => {
populate({});
expect(subject.val()).to.be.null;
expect(subject.child("a").val()).to.be.null;

populate({ myKey: {} });
expect(subject.val()).to.be.null;
expect(subject.child("myKey").val()).to.be.null;

populate({ myKey: { child: null } });
expect(subject.val()).to.be.null;
expect(subject.child("myKey").val()).to.be.null;
expect(subject.child("myKey/child").val()).to.be.null;
});

it("should deal with empty array values appropriately", () => {
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2 changes: 1 addition & 1 deletion src/common/providers/database.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -131,7 +131,7 @@ export class DataSnapshot implements database.DataSnapshot {
}
if (parts.length) {
for (const part of parts) {
if (source[part] === undefined) {
if (typeof source === "undefined" || source === null) {
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As well as moving this "up" to the parent object I've also changed the check from === undefined to a typeof so it matches the other checks elsewhere:

firebase-functions/src/common/providers/database.ts

Line 173 in 5f7b331

if (typeof val === "undefined" || val === null) {

firebase-functions/src/common/providers/database.ts

Line 278 in 5f7b331

if (node === null || typeof node === "undefined") {

return null;
}
source = source[part];
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