Updates to documents fail when graphql replication plugin is enabled

[gautambt]

Issue

Enabling graphql plugin leads to document updates faiingl with the error below. The issue can be reproduced by applying the patch in the code section. The issue occurs because the graphql plugin creates two keys _revisions and _deleted that are not part of the schema. I can raise a pull request with a fix if someone can guide me on the right approach for fixing this. I have tried two approaches without success:

1. adding _deleted and _revisions to the schema in rxSchema but that seemed to fail because rxDocument.ts tries to set _deleted$.

2. Remove the keys in handleDocumentFromRemote before the event emitting but in this case deleted documents will not raise an event.

Error stack trace

rx-error.js:129 Uncaught (in promise) RxError: RxError:
object does not match schema
Given parameters: {
errors:[
  {
    "field": "data",
    "message": "has additional properties"
  },
  {
    "field": "data",
    "message": "has additional properties"
  }
]
obj:{
  "name": "Spiderman",
  "color": "Red",
  "updatedAt": 1576988945,
  "_deleted": false,
  "_revisions": {
    "start": 2,
    "ids": [
      "64ce14acf3846743rxdbreplicationgraphql",
      "5bcd1241391d47aba8a73e51af84ce63"
    ]
  },
  "_rev": "2-64ce14acf3846743rxdbreplicationgraphql",
  "id": "Spiderman"
}
schema:{
  "version": 0,
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "primary": true
    },
    "name": {
      "type": "string",
      "index": true
    },
    "color": {
      "type": "string",
      "index": true
    },
    "updatedAt": {
      "type": "number",
      "index": true
    },
    "_rev": {
      "type": "string",
      "minLength": 1
    },
    "_attachments": {
      "type": "object"
    }
  },
  "required": [
    "color",
    "id"
  ],
  "additionalProperties": false,
  "keyCompression": false,
  "compoundIndexes": []
}}
    at newRxError (webpack:///./node_modules/rxdb/dist/es/rx-error.js?:129:10)
    at RxSchema.validate (webpack:///./node_modules/rxdb/dist/es/plugins/validate.js?:49:71)
    at eval (webpack:///./node_modules/rxdb/dist/es/rx-document.js?:300:32)

Info

• Environment: Browser
• Adapter: IndexDB
• Stack: Javascript

Code

The issue can be reproduced by applying this patch to the graphql example:

diff --git a/examples/graphql/client/index.js b/examples/graphql/client/index.js
index d211fe5c..d3bf99c5 100644
--- a/examples/graphql/client/index.js
+++ b/examples/graphql/client/index.js
@@ -19,6 +19,9 @@ RxDB.plugin(RxDBErrorMessagesModule);
 import RxDBValidateModule from 'rxdb/plugins/validate';
 RxDB.plugin(RxDBValidateModule);
 
+import UpdatePlugin from 'rxdb/plugins/update';
+RxDB.plugin(UpdatePlugin);
+
 import {
     GRAPHQL_PORT,
     GRAPHQL_PATH,
@@ -260,6 +263,19 @@ async function run() {
         document.querySelector('input[name="name"]').value = '';
         document.querySelector('input[name="color"]').value = '';
     };
+
+    setInterval(async () => {
+        const heros = await collection.find().exec();
+        heros.forEach((hero) => {
+            console.log(hero.toJSON())
+
+            hero.update({
+                $set: {
+                    updatedAt: Math.round(new Date().getTime() / 1000)
+                }
+              })
+        })
+    }, 5000)
 }
 run().catch(err => {
     console.log('run() threw an error:');

[pubkey]

@gautambt thank you for the great investigation and example code.
I could reproduce and fix the problem.