Value for argument "documentPath" is not a valid resource path. Path must be a non-empty string

user_9219650 0
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I want to write a cloud function that listens to whether a new document is created in the following subcollection of some document of users. However, the user document upon previous creation may not have a following subcollection.

In other words, I want a cloud that responds to db.collection(“users”).doc(“doc_id1”).collection(“following”).doc(“doc_id2”).set(new_document) , and I have written the cloud function to be

exports.create_friend_request_onCreate = functions.firestore
  .document("users/{user_id}/{following}/{following_id}")
  .onCreate(f2);

And implementation of f2 is written in some other file

exports.f2 = async function(snapshot) {
 //some code
}

However upon creation the document in the subcollection, I get the following error

Error: Value for argument "documentPath" is not a valid resource path. Path must be a non-empty string.

Can someone explain to me what is wrong here?

google-cloud-functions google-cloud-firestore firebase node.js
4 Answers

I had a same problem and this reason of the problem is doc path must be a string. collection("questions").doc(21) is wrong. collection("questions").doc("21") is work.

-you have to make sure the variables are strings .You can use "users/{String(user_id)}/{following}/{String(following_id)}"

user_174886460

The correct path should have been 'users/{user_id}/following/{following_id}', apparently the double quotes cannot be used as paths.

user_92196500

Change this:

  .document("users/{user_id}/{following}/{following_id}")

into this:

  .document("users/{user_id}/following/{following_id}")

The collection shouldn't have a {wildcard}

user_70154000

This happened to me because in my Controller (of the API) I had something like this.

export const deleteUserGallery = async (req: Request, res: Response) => {
    const { user_id } = req.params

You need to change your req.params to req.body if that's the case, to something like this:

export const deleteUserGallery = async (req: Request, res: Response) => {
        const { user_id } = req.body
user_112565100
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