Vulcan/packages/vulcan-ui-bootstrap/lib/components/forms/Checkboxgroup.jsx

import React from 'react';
import { Checkbox } from 'formsy-react-components';
import { registerComponent } from 'meteor/vulcan:core';

// note: treat checkbox group the same as a nested component, using `path`
const CheckboxGroupComponent = ({ refFunction, path, value, updateCurrentValues, inputProperties }) =>
  inputProperties.options.map((option, i) => (
    <Checkbox
      key={i}
      {...inputProperties}
      label={option.label}
      value={value.includes(option.value)}
      ref={refFunction}
      onChange={(name, isChecked) => {
        // give each individual checkbox its own path
        const checkboxPath = `${path}.${i}`;
        if (isChecked) {
          updateCurrentValues({ [checkboxPath]: option.value });
        } else {
          updateCurrentValues({ [checkboxPath]: null });
        }
      }}
    />
  ));

registerComponent('FormComponentCheckboxGroup', CheckboxGroupComponent);