export default function sendFollowUser(user, successCb, failureCb) {
  const csrfToken = document.querySelector("meta[name='csrf-token']").content;

  const formData = new FormData();
  formData.append('followable_type', 'User');
  formData.append('followable_id', user.id);
  formData.append('verb', user.following ? 'unfollow' : 'follow');

  fetch('/follows', {
    method: 'POST',
    headers: {
      'X-CSRF-Token': csrfToken,
    },
    body: formData,
    credentials: 'same-origin',
  })
    .then(response => response.json())
    .then(json => {
      console.log(`in fetch request: ${json.outcome}`);
      successCb(json.outcome);
      // json is followed or unfollowed
    })
    .catch(error => {
      console.log(error);
    });
}