I'm looking to add an exposed filter that only contains existing user inputed value.
For example. I've create a content type called 'Items'. Inside that content type there is a field called 'Team name'. The user can freely enter the Team name and add multiple items associated with that Team.
When the user is viewing items, I'd like for them to be able to filter based on that Team Name, but rather than force them to type in the name, I'd like for the exposed filter to contain a list of Team Names that have been added into the nodes.
How to make an exposed filter that only contains existing database values?