Link Listing to rush-category on creation

[wderocco8]

Summary

In order to decide which potential members are applicable in the rush process (attended ≥ 4 events...), we need to link listings to a corresponding rush-category in order to pull the data from the rush events in MongoDB. Here are a couple of approaches:

Option 1 (automated) In-progress

• create a Listing as per usual
  • auto-create a rush-category with the same name as the Listing
• enable admin to select a different rush-category in the listing settings if needed (e.g. someone created another with the same name...)

Option 2 (manual)

• create a rush-category FIRST (must come before Listing creation)
• when creating a Listing force the admin to select the corresponding rush-category from a dropdown