Makes the call creation strategy more resilient

LeStorage/ApiCallCollection.swift

@@ -218,21 +218,19 @@ actor ApiCallCollection<T: Storable>: SomeCallCollection {
     /// The method updates existing calls or creates a new one
     fileprivate func _callForInstance(_ instance: T, method: HTTPMethod) async throws -> ApiCall<T>? {
 
-        if let existingCall = self.items.first(where: { $0.dataId == instance.stringId }) {
-            switch method {
-            case .delete:
-                self.deleteById(existingCall.id)  // delete the existing call as we don't need it
-                if existingCall.method == HTTPMethod.post {
-                    return nil  // if the post has not been done, we can just stop here
-                } else {
-                    return try self._createCall(instance, method: method)  // otherwise it's a put and we want to send the delete
-                }
-            default:  // here we should only trying to PUT, so we update the existing POST/PUT with the instance new values
-                existingCall.body = try instance.jsonString()
-                return existingCall
-            }
-        } else {
-            return try self._createCall(instance, method: method)
+        // cleanup
+        let existingCalls = self.items.filter { $0.dataId == instance.stringId }
+        self._deleteCalls(existingCalls)
+        
+        // create
+        let call = try self._createCall(instance, method: method)
+        self._prepareCall(apiCall: call)
+        return call
+    }
+    
+    fileprivate func _deleteCalls(_ calls: [ApiCall<T>]) {
+        for call in calls {
+            self.deleteById(call.id)
         }
     }
 
@@ -294,7 +292,6 @@ actor ApiCallCollection<T: Storable>: SomeCallCollection {
     /// Initiates the process of sending the data with the server
     fileprivate func _synchronize<V: Decodable>(_ instance: T, method: HTTPMethod) async throws -> V? {
         if let apiCall = try await self._callForInstance(instance, method: method) {
-            self._prepareCall(apiCall: apiCall)
             return try await self._executeApiCall(apiCall)
         } else {
             return nil

LeStorage/Services.swift

@@ -142,7 +142,7 @@ public class Services {
             Logger.w(message)
         }
         
-        if !(V.self is Empty?.Type) {
+        if !(V.self is Empty?.Type) && !(V.self is Empty.Type) {
             return try jsonDecoder.decode(V.self, from: task.0)
         } else {
             return try jsonDecoder.decode(V.self, from: "{}".data(using: .utf8)!)
@@ -280,6 +280,11 @@ public class Services {
         return try await self._runRequest(postRequest)
     }
     
+    public func delete<T: Storable>(_ instance: T) async throws -> T {
+        let deleteRequest = try self._deleteRequest(type: T.self, id: instance.stringId)
+        return try await self._runRequest(deleteRequest)
+    }
+    
     /// Executes an ApiCall
     func runApiCall<T: Storable, V: Decodable>(_ apiCall: ApiCall<T>) async throws -> V {
         let request = try self._request(from: apiCall)