Material UI SelectField for react-final-form

import React from "react";

import { FormControl, FormHelperText, InputLabel, Select } from "material-ui";

export const SelectField = ({
  input: { name, onChange, value, ...restInput },
  meta,
  children,
  label,
  fullWidth,
  margin,
  InputLabelProps,
  ...rest
}) => (
  <FormControl fullWidth={fullWidth} margin={margin}>
    {label && <InputLabel error={meta.error && meta.touched} {...InputLabelProps}>{label}</InputLabel>}
    <Select
      {...rest}
      name={name}
      error={meta.error && meta.touched}
      inputProps={restInput}
      value={value}
      onChange={onChange}
    >
      {children}
    </Select>
    {meta.error &&
      meta.touched && (
        <FormHelperText error={true}>{meta.error}</FormHelperText>
      )}
  </FormControl>
);

Demo code: https://codesandbox.io/s/kkp59xr047