Documentation: The DataProvider action "createMany" isn't documented anywhere

Context I’m trying to fix an issue in this library https://github.com/benwinding/react-admin-import-csv/issues/21 and was encouraged to use the createMany method on the DataProvider.

Problem The createMany doesn’t seem to be documented anywhere:

• It doesn’t seem to be in official documentation @3.8.4
• It’s not in the typescript declarations in ra-core@3.8.4
• This comment mentions it, as well as this StackOverflow answer

Is this a new action? Or is it optional?

Environment

• React-admin version: 3.8.4
• Last version that did not exhibit the issue (if applicable): -
• React version: 16.8.6
• Browser: Chrome
• Stack trace (in case of a JS error): -

[fzaninotto]

Yep: call createMany in a try/catch, and fallback to create in the catch block.

[benwinding]

We’re adding TypeScript types to encourage doing that type of check at compile time, but that implies that you use these type sin your code, too.

Yes, my library react-admin-import-csv is written in Typescript so I’m using types where I can.

I want to call a custom DataProvider verb createMany if it exists otherwise fallback to the singular create method. Is there a clean way to do this?