Creating a login prompt

The first thing we should do is think about how our app will behave. When it's launched, we should check for an available access token using the FBSDK AccessToken API. If it's not available, then our user isn't logged in and we should show them the Log In button, just like we required a budget in our previous project, Expense.

If/when the user is logged in, we should grab their feed data, load it into the component state, and then log it to the console to show that we have it.

The first thing we should do is modify the App component so that:

• On the componentWillMount event, we use the AccessToken API's getCurrentAccessToken method to check and see whether the user is logged in.
  • If the user is not logged in, we should alert the user that they are not logged in. In the next section, we will replace this part with the login screen that we will create.
  • If the user is logged in, we should call the getFeed method of graphMethods.
• Also, it should no longer render the LoginButton...