Not Understanable Error

[ac2epsilon]

What you were expecting:

I expected ra-data-graphql example will work.
https://github.com/marmelab/react-admin/tree/master/packages/ra-data-graphql-simple#usage
And after I copy-pasted code into App.js... (compiling was fine)

What happened instead:

... in run time I got following with 2 sec delay after page appearence

Unhandled Rejection (Error): The dataProvider threw an error. It should return a rejected Promise instead.

Steps to reproduce:

Copy And Paste App.js from docs, change endpoint to http://ac2spotters.gq/apollo (playground opened, so welcome to play) and what? Even IF it is my own fail like "Not properly configured schema", I'd like to know this, not The dataProvider threw an error.

Other information:

Environment

• React-admin version: "react-admin": "^3.11.2", "ra-data-graphql-simple": "^3.10.2", "graphql": "^15.4.0"
• Last version that did not exhibit the issue (if applicable): n/a
• React version: "react": "^17.0.1"
• Browser: Версія 86.0.4240.193 (Розробка) (64-розрядна версія)
• Stack trace (in case of a JS error):
  Unhandled Rejection (Error): The dataProvider threw an error. It should return a rejected Promise instead.
  ▼ 22 stack frames were expanded.
  performQuery
  node_modules/ra-core/esm/dataProvider/useDataProvider.js:512
  doQuery
  node_modules/ra-core/esm/dataProvider/useDataProvider.js:275
  Proxy.
  node_modules/ra-core/esm/dataProvider/useDataProvider.js:239
  (anonymous function)
  node_modules/ra-core/esm/dataProvider/useQueryWithStore.js:180
  (anonymous function)
  node_modules/ra-core/esm/dataProvider/useQueryWithStore.js:179
  invokePassiveEffectCreate
  node_modules/react-dom/cjs/react-dom.development.js:23487
  HTMLUnknownElement.callCallback
  node_modules/react-dom/cjs/react-dom.development.js:3945
  invokeGuardedCallbackDev
  node_modules/react-dom/cjs/react-dom.development.js:3994
  invokeGuardedCallback
  node_modules/react-dom/cjs/react-dom.development.js:4056

[fzaninotto]

Which code snippet did you paste?

[ac2epsilon]

[fzaninotto]

I could reproduce the error "The dataProvider threw an error. It should return a rejected Promise instead.". Fix incoming.

[fzaninotto]

Let's keep this issue for the initial description.

The providers are indeed outdated. Please look for existing issues about them before opening a new issue.