Manually configure asset sources not working

[shabith]

Describe the bug

I tried to disable the asset source for a specific schema following the Manually configure asset sources section in README but it is not working.

To Reproduce

Steps to reproduce the behavior:

1. Create a schema with field type image called movie-image
2. Try to remove unsplash as asset source for that schema adding following code to the config

import { unsplashImageAsset, unsplashAssetSource } from 'sanity-plugin-asset-source-unsplash'

export default defineConfig({
  // ...
  plugins: [unsplashImageAsset()],
  form: {
    image: {
      assetSources: (previousAssetSources, { schema }) => {
        if (schema.name === 'movie-image') {
          // remove unsplash from movie-image types
          return previousAssetSources.filter((assetSource) => assetSource !== unsplashAssetSource)
        }
        return previousAssetSources
      },
    },
  },
})

Expected behavior

movie-image shouldn't have unsplash as in source dropdown

Which versions of Sanity are you using?

@sanity/cli (global) 3.29.1 (latest: 3.44.0)
@sanity/astro 3.0.0 (latest: 3.1.3)
@sanity/code-input 4.1.4 (up to date)
@sanity/vision 3.41.1 (latest: 3.44.0)
sanity 3.41.1 (latest: 3.44.0)

What operating system are you using?

Which versions of Node.js / npm are you running?

10.5.0
v20.11.0

Additional context

When I console log schema.name it returns undefined

[eduardonwa]

can't believe it's been a year and no response... i am too having the same issue.

here's more information: https://www.sanity.io/docs/custom-asset-sources#8a7448076430

you can have something like this on the sanity config

form: {
    image: {
      assetSources: (prev) => [...prev, unsplashAssetSource],
      directUploads: true,

on your image fields, if you want to allow both types of sources, you don't have to do anything because it will inherit this setting. if you only want from the computer use

options: {
 sources: [] // empty array
}

this will allow custom uploads but it will not bring the "static array" aka the previously uploaded images. couldn't figure that part.