title: Using Firebase and Angular, how can I retrieve a key generated from another page?
body: <p>I am creating a grocery list app that stores food ids inside a user's list. The name of this list is generated with a .push method that is fired once, when the user registers, and will always remain the same. I need to retrieve this value on other pages that edit the food attributes.</p>
  
  <p>Here is my database structure:</p>
  
  <pre><code>"userlist" : {
    {
      "-L-i60DHuiX6jba6TZLt" : {
        "list" : {
          "-L-4FJ9EaFjtDT_7XO6c" : {
            "category" : "Beverages",
            "foodname" : "7Up",
            "state" : "on"
          },
          "-L-i4dIBkloIxZPtY3Ge" : {
            "category" : "bread",
            "foodname" : "toast",
            "state" : "on"
          }
        }
      }
    }
  }
  </code></pre>
  
  <p>How can I retrieve the value of the first value shown, "-L-i60DHuiX6jba6TZLt"?</p>