CODEWITHSUNDEEP
restcollectionsgoogle-cloud-firestore
Roberto Olivares
Roberto Olivares

Reputation: 1143

FireStore REST API: How to add a subcollection to a document using REST commands?

Using FireStore's REST API documented at: https://firebase.google.com/docs/firestore/reference/rest

I'm trying to create a new document in "users" that has a subcollection named "subcol1" with an empty doc in it called "subdoc1"

However, the following REST command to create the new document does not work:

curl -X POST 
-H "Content-Type: application/json" 
-d "{ 'fields': { 'subcol1': [{'subdoc1': { 'fields': {} } }] } }"
"https://firestore.googleapis.com/v1/projects/XXXX/databases/(default)/documents/users"

How does one add a subcollection to a new document (or existing one?) using FireStore's REST API?

I specifically have to use REST for this implementation.

This is the error response I get back:

{   "error": {
    "code": 400,
    "message": "Invalid value at 'document.fields[0].value' (Map), Cannot have repeated items ('subcol1') within a map.\nInvalid JSON payload received. Unknown name \"\" at 'document.fields[0].value': Proto fields must have a name.",
    "status": "INVALID_ARGUMENT",
    "details": [
      {
        "@type": "type.googleapis.com/google.rpc.BadRequest",
        "fieldViolations": [
          {
            "field": "document.fields[0].value",
            "description": "Invalid value at 'document.fields[0].value' (Map), Cannot have repeated items ('subcol1') within a map."
          },
          {
            "field": "document.fields[0].value",
            "description": "Invalid JSON payload received. Unknown name \"\" at 'document.fields[0].value': Proto fields must have a name."
          }
        ]
      }
    ]   } }

Thanks!

Upvotes: 2

Views: 1212

Answers (1)

Roberto Olivares
Roberto Olivares

Reputation: 1143

After more tinkering with this, I found a solution.

The following works:

  1. First create the new document (without the subcollection).
  2. Next create the subdocument using the "not-yet-created" subcollection's URL.

So first create the new "top-level" doc:

curl -X POST 
-H "Content-Type: application/json" 
-d "{ 'fields': { } }"
"https://firestore.googleapis.com/v1/projects/XXXX/databases/(default)/documents/users"

Then create the subdoc (which "creates" the subcollection):

curl -X POST 
-H "Content-Type: application/json" 
-d "{ 'fields': { } }"
"https://firestore.googleapis.com/v1/projects/XXXX/databases/(default)/documents/
users/<USER-KEY-FROM-PREVIOUS-JSON-RESPONSE>/subcol1"

Upvotes: 2

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