actions.js

// === Action Creators ===
export function posItemRequest(itemBody) {
  return {
    type: 'ITEM_POST_REQUEST',
    payload: {
      itemBody: itemBody
    }
  }
} 

export function posItemSuccess(itemBody) {
  return {
    type: 'ITEM_POST_SUCCESS',
    payload: {
      itemBody: itemBody
    }
  }
}

export function posItemFail(errorMsg) {
  return {
    type: 'ITEM_POST_FAIL',
    payload: {
      errorMsg: errorMsg
    }
  }
} 
 

// === Thunk ===
export function postItem(itemBody, userToken) {
  const options = {
    method: 'POST',
    body: JSON.stringify(itemBody)
    headers: {'User-Token': userToken}
  }

  return (dispatch, getState) => {
    return fetch('http://www.urlhere.com', options)
      .then(response => response.json())
      .then(json => dispatch(posItemSuccess(itemBody)))
      .catch(err => dispatch(posItemFail(err.message)))
    }
}