Problem sending POST body to the Firestore REST API - firebase

Question

I want to create a new document in Firestore using the REST API.
Very good examples here using Axios to send the POST request with some fields:
https://www.jeansnyman.com/posts/google-firestore-rest-api-examples/
axios.post(
"https://firestore.googleapis.com/v1/projects/<PROJECTIDHERE>/databases/(default)/documents/<COLLECTIONNAME>",
{
fields: {
title: { stringValue: this.title },
category: { stringValue: this.category },
post: { stringValue: this.post },
summary: { stringValue: this.description },
published: { booleanValue: this.published },
created: { timestampValue: new Date() },
modified: { timestampValue: new Date() }
}
}
).then(res => { console.log("Post created") })
And an example here using Python Requests:
Using the Firestore REST API to Update a Document Field
(this is a PATCH request but the field formatting is the same as in a POST request)
import requests
import json
endpoint = "https://firestore.googleapis.com/v1/projects/[PROJECT_ID]/databases/(default)/documents/[COLLECTION]/[DOCUMENT_ID]?currentDocument.exists=true&updateMask.fieldPaths=[FIELD_1]"
body = {
"fields" : {
"[FIELD_1]" : {
"stringValue" : "random new value"
}
}
}
data = json.dumps(body)
headers = {"Authorization": "Bearer [AUTH_TOKEN]"}
print(requests.patch(endpoint, data=data, headers=headers).json())
I am using Google Apps Script UrlFetchApp.fetch to send my requests. I am able to use GET requests with no problems. For example, to get all the documents in a collection (in Google Apps Script):
function firestore_get_documents(){
var options = {
headers: { 'Authorization': 'Bearer ' + ScriptApp.getOAuthToken() },
method:'GET'
}
var response = UrlFetchApp.fetch('https://firestore.googleapis.com/v1/projects/<PROJECTIDHERE>/databases/(default)/documents/myCollection', options);
var parsed = JSON.parse(response.getContentText());
return parsed;
}
This works nicely. And changing 'method' to 'POST' creates a new document in myCollection as expected. Then I try to add a POST body with some fields (or just one field):
function firestore_create_new_document(){
var options = {
headers: { 'Authorization': 'Bearer ' + ScriptApp.getOAuthToken() },
method:'POST',
payload: {fields: { title: { stringValue: 'newTitle' } } }, // If you comment out this line, it works as expected
muteHttpExceptions:true
}
var response = UrlFetchApp.fetch('https://firestore.googleapis.com/v1/projects/<PROJECTIDHERE>/databases/(default)/documents/myCollection', options);
var contentText = response.getContentText();
var parsed = JSON.parse(response.getContentText());
return parsed;
}
I get the following errors:
code: 400 message: "Request contains an invalid argument."
status: "INVALID_ARGUMENT"
details[0][#type]: "type.googleapis.com/google.rpc.BadRequest"
details[0][fieldViolations][0][field]: "{title={stringValue=newTitle}}"
details[0][fieldViolations][0][description]: "Error expanding 'fields' parameter. Cannot find matching fields for path '{title={stringValue=newTitle}}'."
Documentation is available here:
https://firebase.google.com/docs/firestore/reference/rest/v1/projects.databases.documents/createDocument
https://firebase.google.com/docs/firestore/reference/rest/v1/projects.databases.documents#Document
The problem may be the formatting of my 'fields' object - I've tried several different formats from the documentation and examples
The problem may be that the fields don't exist yet? I think I should be able to create a new document with new fields
The problem may be with the way UrlFetchApp.fetch sends my JSON body. I have tried using payload = JSON.stringify(payload_object) and that doesn't work either.
I think UrlFetchApp is doing something slightly different than Axios or Python Requests - the body is getting sent differently, and not parsing as expected.

Answer 1

How about the following modification?
From:
var options = {
headers: { 'Authorization': 'Bearer ' + ScriptApp.getOAuthToken() },
method:'POST',
payload: {fields: { title: { stringValue: 'newTitle' } } }, // If you comment out this line, it works as expected
muteHttpExceptions:true
}
To:
var options = {
headers: { 'Authorization': 'Bearer ' + ScriptApp.getOAuthToken() },
method:'POST',
payload: JSON.stringify({fields: { title: { stringValue: 'newTitle' } } }),
contentType: "application/json",
muteHttpExceptions:true
}
When I tested above modified request, I could confirm that it worked. But if other error occurs, please tell me.
Reference:
Class UrlFetchApp