[CRUD] Allow renderFormField to access form state

[olosvinipaulino]

Summary

Currently, the renderFormField function in Toolpad Core’s DataSource fields does not provide access to the values of other fields in the form. This makes it impossible to implement dynamic forms where the visibility or behavior of a field depends on the value of another field.

Examples

For example, I want to display the length field only when the type field is string. With the current signature:

renderFormField: ({ value, onChange, error }) => React.ReactNode

it is not possible to access the value of type to conditionally render the length field.

Suggested new signature:

renderFormField: ({ value, onChange, error, formState }) => React.ReactNode

This would allow code like:

renderFormField: ({ value, onChange, error, formState }) => {
  if (formState.type !== 'string') return null;
  return <TextField ... />;
}

Motivation

Allowing access to the form state inside renderFormField would enable the creation of more dynamic and responsive forms, improving user experience and making Toolpad Core more flexible for advanced use cases.

Search keywords: crud renderFormField formState dataSource

[apedroferreira]

Good idea, this would be a useful feature!
Your implementation suggestion sounds like it would be a good solution.