combineDataProviders does not support more than 2 parameters in custom dataProvider methods

[karpushchenko]

What you were expecting: According to the documentation examples, custom dataProvider methods should not follow the same signature as default methods, in example it's banUser: (userId) => Promise, hence I expect to be able to have any signature that is required for my needs, including functions with more than 2 parameters

What happened instead: combineDataProviders calls dataProvider methods limiting it to 2 params: dataProviderMatcher(resource)[name](resource, params)

Steps to reproduce:

• create a custom method in dataProvider
• use combineDataProviders when you attach dataProvider to the admin context
• call a custom method and you will get undefined on 3rd and following parameters.

Related code: Example on StackBlitz Here in src/dataProvider.tsx I've created a new method called customMethod with 3rd parameter. In src/Layout.tsx I call this method and I expect different console.log outputs but always get the falsy one.

Example of this custom method:

// Always falsy
  customMethod: (resource, params, optionalFlag) => {
    console.log(resource, params, optionalFlag);
    if (optionalFlag === true) {
      console.log('data provider customMethod optionalFlag is true');
    } else {
      console.log('data provider customMethod optionalFlag is false');
    }
  },

Environment

• React-admin version: 4.16.11
• React version: 17
• Browser: Firefox Developer Edition