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Remember to get things from realm from the main thread

WhatsOpen/WhatsOpen/MainTableViewController.swift

@@ -34,7 +34,7 @@ class MainTableViewController: UITableViewController {
 
 
         SRCTNetworkController.performDownload { (facilities) in
-            self.facilitiesArray = Array(facilities)
+            self.facilitiesArray = Array(facilities!)
                 self.tableView.reloadData()
         }
     }

WhatsOpen/WhatsOpen/SRCTNetworkController.swift

@@ -15,33 +15,40 @@ import ObjectMapper
 class SRCTNetworkController: NSObject {
     //Use this for testing with the new API, might make it possible to get stuff moving pre official release 
     //https://api.srct.gmu.edu/whatsopen/v2/facilities/?format=json
-    public static func performDownload(completion: @escaping (_ result: List<Facility>) -> Void) {
+    public static func performDownload(completion: @escaping (_ result: List<Facility>?) -> Void) {
 
-    let requestURL: NSURL = NSURL(string: "https://api.srct.gmu.edu/whatsopen/v2/facilities/?format=json")!
+    	let requestURL: NSURL = NSURL(string: "https://api.srct.gmu.edu/whatsopen/v2/facilities/?format=json")!
         let urlRequest: NSMutableURLRequest = NSMutableURLRequest(url: requestURL as URL)
         let session = URLSession.shared
 
-        let task = session.dataTask(with: urlRequest as URLRequest) {
+		let task = session.dataTask(with: urlRequest as URLRequest) {
             (data, response, error) -> Void in
+			
+			if(error != nil) {
+				completion(nil)
+				return
+			}
+			else {
+				let httpResponse = response as! HTTPURLResponse
+				let statusCode = httpResponse.statusCode
+				if (statusCode == 200) {
+					if let dataN = data {
+						if let json = try? JSONSerialization.jsonObject(with: dataN, options: []) as? [[String: Any]] {
+							// Map function to iterate through each JSON tree
+							let facilities = json!.map({ (json) -> Facility in
+								let facility = Facility()
+								let map = Map(mappingType: .fromJSON, JSON: json, toObject: true, context: facility, shouldIncludeNilValues: true)
+								facility.mapping(map: map)
+								return facility
+							})
+							// This is where completion is called
+							// Right after the array is done mapping all facility objects
+							completion(List(facilities))
+						}
+					}
+				}
+			}
 
-            let httpResponse = response as! HTTPURLResponse
-            let statusCode = httpResponse.statusCode
-            if (statusCode == 200) {
-                if let dataN = data {
-                    if let json = try? JSONSerialization.jsonObject(with: dataN, options: []) as? [[String: Any]] {
-                        // Map function to iterate through each JSON tree
-                        let facilities = json!.map({ (json) -> Facility in
-                            let facility = Facility()
-                            let map = Map(mappingType: .fromJSON, JSON: json, toObject: true, context: facility, shouldIncludeNilValues: true)
-                            facility.mapping(map: map)
-                            return facility
-                        })
-                        // This is where completion is called
-                        // Right after the array is done mapping all facility objects
-                        completion(List(facilities))
-                    }
-                }
-            }
     }
     task.resume()
 

WhatsOpen/WhatsOpen/Views/FacilitiesListViewController.swift

@@ -239,6 +239,7 @@ class FacilitiesListViewController: UIViewController, UICollectionViewDelegate,
 				}
 				else {
 					facilitiesArray = facilities
+					self.LastUpdatedLabel.title = "Updated: " + self.shortDateFormat(lastUpdated)
 				}
 			}
 			else {
@@ -252,33 +253,54 @@ class FacilitiesListViewController: UIViewController, UICollectionViewDelegate,
 	
 	func update(_ sender: Any) {
 		SRCTNetworkController.performDownload { (facilities) in
-			self.facilitiesArray = facilities
-			
-			DispatchQueue.main.async {
-				//let defaults = UserDefaults.standard
-				//defaults.set(facilities, forKey: "FacilitiesList")
-				let date = Date()
-				//defaults.set(date, forKey: "lastUpdatedList")
-				self.LocationsList.reloadData()
-				self.LastUpdatedLabel.title = "Updated: " + self.shortDateFormat(date)
-				let model = FacilitiesModel()
-				model.facilities = facilities
-				model.lastUpdated = date
-				let results = self.realm.objects(FacilitiesModel.self)
-				if results.count == 0 {
-					try! self.realm.write {
-						self.realm.add(model)
+			if(facilities == nil) {
+				DispatchQueue.main.async {
+					let results = self.realm.objects(FacilitiesModel.self)
+					if results.count > 0 {
+						let model = results[0]
+						let facilitiesFromDB = model.facilities
+						let lastUpdated = model.lastUpdated
+						
+						self.facilitiesArray = facilitiesFromDB
+						self.LocationsList.reloadData()
+						self.LastUpdatedLabel.title = "Updated: " + self.shortDateFormat(lastUpdated)
+					}
+					else {
+						self.facilitiesArray = List<Facility>()
 					}
 				}
-				else {
-					let fromRealm = results[0]
-					try! self.realm.write {
-						fromRealm.facilities = model.facilities
-						fromRealm.lastUpdated = model.lastUpdated
+			}
+			else {
+				self.facilitiesArray = facilities!
+				
+				DispatchQueue.main.async {
+					//let defaults = UserDefaults.standard
+					//defaults.set(facilities, forKey: "FacilitiesList")
+					let date = Date()
+					//defaults.set(date, forKey: "lastUpdatedList")
+					self.LocationsList.reloadData()
+					self.LastUpdatedLabel.title = "Updated: " + self.shortDateFormat(date)
+					let model = FacilitiesModel()
+					model.facilities = facilities!
+					model.lastUpdated = date
+					let results = self.realm.objects(FacilitiesModel.self)
+					if results.count == 0 {
+						try! self.realm.write {
+							self.realm.add(model)
+						}
+					}
+					else {
+						let fromRealm = results[0]
+						try! self.realm.write {
+							fromRealm.facilities = model.facilities
+							fromRealm.lastUpdated = model.lastUpdated
+						}
 					}
 				}
 			}
 			
+
+			
 		}
 	}