I'm using Xcode 8 and Swift 2.3 and trying to debug a Core Data problem I'm having with inserting some default data into the persistent store. I'm learning from a Core Data book and in a little above my head
This function is checking to see if we even need to import the default data (trust me, we do) and then will set it up if necessary:
func checkIfDefaultDataNeedsSetup (url:NSURL, type:String) {
if isDefaultDataAlreadySetupForStoreWithURL(url, type: type) == false {
if let lift = NSEntityDescription.entityForName("Lift", inManagedObjectContext: CDHelper.shared.context) { /*breakpoint*/ 1
// not returning here
let newLiftEvent = Lift(entity: lift, insertIntoManagedObjectContext: CDHelper.shared.context)
newLiftEvent.uid = 0
newLiftEvent.liftName = "Back Squat"
CDHelper.saveSharedContext()
} else {
// skip setup
}
return
}
At breakpoint1 it calls CDHelper.shared.context (the inManagedObjectContext argument) where I have it stopping at breakpoints 2 and 3:
private let _sharedCDHelper = CDHelper() /* breakpoint 3 */
class CDHelper : NSObject {
// MARK: - SHARED INSTANCE
class var shared : CDHelper {
return _sharedCDHelper /* breakpoint 2 */
}
When stopped at breakpoint 3, as soon as I click Step Into I get this:
I would expect it to return to the next line after breakpoint 1 where it went off to get CDHelper.shared.context but it doesn't. Xcode and Simulator aren't hung up or anything. It just gets to this point and stays there as if its waiting for something.
I'm guessing this optional binding if let lift = NSEntityDescription.entityForName("Lift", inManagedObjectContext: CDHelper.shared.context) isn't getting assigned so it's not going into the method. But I'm as certain as I can be that the Lift entity is in the managedObjectContext. I see it in my .xcdatamodeld, I've looked in the db using DB for SQLite, and I've even deleted the data model and recreated it. I've also ensured that I'm using just the .MainQueueConcurrencyType.
Is there an obvious problem that anyone can see or are there other things I should look for? Maybe something else I can do to ensure the Lift entity is in the managed object context like I think it is?
I'm guessing this optional binding if let lift = NSEntityDescription.entityForName("Lift", inManagedObjectContext: CDHelper.shared.context) isn't getting assigned
Why guess? Remove or disable all breakpoints and put a breakpoint on that line. Now run the app. When we pause at that breakpoint, step over. Now look to see where you are.
Related
Can anyone explain me why when i declare variable like this:
private let viewModel = TermsAndConditionViewModel()
// TermsAndConditionViewModel
class TermsAndConditionViewModel {
private let permissionsModel: PermissionsModel
private let userSession: UserSessionManager
init(
permissionsModel: PermissionsModel = PermissionsModelImpl(),
userSession: UserSessionManager = UserSessionManager.shared
) {
self.permissionsModel = permissionsModel
self.userSession = userSession
}
}
and run test in Xcode I got warning like
update: there is no message about warning.
and this is when I check in Xcode/Coverage
Thank for your help.
Hi #user2629744 welcome to StackOverflow.
The red bar you are seeing in the right gutter is not a warning but Xcode's Code Coverage Annotation.
It's red and it shows a 0 because there is no test exercising that code path.
It's hard to be sure without having access to your codebase, but since we're talking about a view model in your example I'm guessing that line of code comes from the view layer. Right?
If that's the case, it might be okay if you don't test it. If all the business logic lives in the view model (which you can throughly test) and you keep your view layer humble, then you'll still have the majority of your behavior covered.
Updating to the latest version of AudioKit left me changing several AKCallbackInstrument instances over to the new AKMIDICallbackInstrument class which now incorporates the former as legacy behavior. When doing so however, I ran into this weird error. Maybe a Swift nuance I am missing?
let callback = AKMIDICallbackInstrument() { status, note, velocity in
if status == .noteOn { //errors out
// do something
}
}
Comparing status to .noteOn errors out with:
"Expression type 'Bool' is ambiguous without more context.". Makes sense, because AKMIDICallbackInstrument is not returning an AKMIDIStatus in status anymore, but a straight MIDIByte (UInt8). Using direct MIDI command numerics works.
let callback = AKMIDICallbackInstrument() { status, note, velocity in
if status == 0x90 {
// do something
}
}
So we have a problem and a potential solution. I'm just not sure that this is the way to go and AKMIDICallbackInstrument didn't hit the docs yet.
For the time being, you can convert the MIDIByte to AKMIDIStatus like this:
let status = AKMIDIStatus(rawValue: Int(statusByte >> 4))
On the develop branch, there is a new initializer for AKMIDIStatus that directly takes MIDIByte as a parameter to make this a little easier.
I've been reading up on ReactiveCocoa v3 lately and I'm struggling with just setting up basic stuff. I've already read the changelog, the tests, the few SO questions and the articles by Colin Eberhardt on the subject. However, I'm still missing examples on basic bindings.
Let's say I have an app that presents the menu of the day. The app is using RAC3 and the MVVM pattern.
Model (Menu)
The model has one simple method for fetching todays menu. As for now, this don't do any network requests, it basically just creates a model object. The mainCourse property is a String.
class func fetchTodaysMenu() -> SignalProducer<Menu, NoError> {
return SignalProducer {
sink, dispoable in
let newMenu = Menu()
newMenu.mainCourse = "Some meat"
sendNext(sink, newMenu)
sendCompleted(sink)
}
}
ViewModel (MenuViewModel)
The view model exposes different String variables for letting the view controller show the menu. Let's just add one property for showing the main course.
var mainCourse = MutableProperty("")
And we add a binding for this property:
self.mainCourse <~ Menu.fetchTodaysMenu()
|> map { menu in
return menu.mainCourse!
}
ViewController (MenuViewController)
Last but not least, I want to present this main course in a view. I'll add a UILabel for this.
var headline = UILabel()
And finally I want to set the text property of that UILabel by observing my view model. Something like:
self.headline.text <~ viewModel.headline.producer
Which unfortunately does not work.
Questions
The method fetchTodaysMenu() returns a SignalProducer<Menu, NoError>, but what if I want this method to return a SignalProducer<Menu, NSError> instead? This would make my binding in my view model fail as the method now may return an error. How do I handle this?
As mentioned, the current binding in my view controller does not work. I've been playing around with creating a MutableProperty that represents the text property of the UILabel, but I never got it right. I also think it feels clumsy or verbose to have to create extra variables for each property I want to bind. This was not needed in RAC2. I intentionally also tried to avoid using DynamicProperty, but maybe I shouldn't? I basically just want to find the right way of doing RAC(self.headline, text) = RACObserve(self.viewModel, mainCourse);.
Any other feedback/guidance on how to make this basic setup is highly appreciated.
So, after writing this question Colin Eberhardt made a part 3 of his RAC3 blog post series which includes a interesting and very relevant example of using MVVM and RAC3. The post can be found here and the source code here.
Based on his work, I've managed to answer my own questions:
By taking a slightly different approach, I'm able to make the fetchTodaysMenu() return a SignalProducer<Menu, NSError> as wanted. Here's how what I then would do in my view model:
MenuService.fetchTodaysMenu()
|> observeOn(QueueScheduler.mainQueueScheduler)
|> start(next: { response in
self.mainCourse.put(response.mainCourse!)
}, error: {
println("Error \($0)")
})
It seems like there's no UIKit bindings yet as of RAC3 beta 4. Colin made some UIKit extensions himself to help him make these bindings I was looking for as well. These can be found here. Adding them to my project, made be able to do exactly what I wanted to:
self.mainCourse.rac_text <~ self.viewModel.mainCourse
Update May 25, 2015
After been working a lot more with ReactiveCocoa 3, I would like to answer 1) once again. By using catch, it's possible to do this in a more declarative manner. I ended up implementing a small helper function for this:
public func ignoreError<T: Any, E: ErrorType>(signalProducer: SignalProducer<T, E>) -> SignalProducer<T, NoError> {
return signalProducer
|> catch { _ in
SignalProducer<T, NoError>.empty
}
}
The function transforms any NSError to NoError making it possible to bind as I wanted to by doing MenuService.fetchTodaysMenu() |> ignoreError.
I open sourced my project as this might be a good starting point for others looking into ReactiveCocoa 3.0:
https://github.com/s0mmer/TodaysReactiveMenu
Update March 5, 2016
As highlighted in the comments, since Swift 2, the ignoreError function would now look like:
public func ignoreError() -> SignalProducer<Value, NoError> {
return flatMapError { _ in
SignalProducer<Value, NoError>.empty
}
}
Also, an extension library called Rex has also been made, where something similar has been added.
Framework: I'm using using MVC 3 + EntityFramework 4.1 Code-First.
Concept: One Legislation entity has many Provision entities. The idea is that the user enters a Legislation entity, that gets saved then the function that saves it passes it along to another function to see whether that Legislation has a ShortTitle. If it does, then it formats it into a properly worded string and includes it as the Legislation's first Provision, then saves the changes to db.
Issue: The problem is, I've tried coding it in different ways, I keep getting a NullReferenceException, telling me to create a new object instance with the "new" keyword, and points me to the savedLegislation.Provisions.Add(provision); line in my second function.
Here are the two functions at issue, this first one saves the Legislation proper:
public Legislation Save(NewLegislationView legislation)
{
Legislation newLegislation = new Legislation();
// Simple transfers
newLegislation.ShortTile = legislation.ShortTile;
newLegislation.LongTitle = legislation.LongTitle;
newLegislation.BillType = legislation.BillType;
newLegislation.OriginatingChamber = legislation.OriginatingChamber;
newLegislation.Preamble = legislation.Preamble;
// More complicated properties
newLegislation.Stage = 1;
this.NumberBill(newLegislation); // Provides bill number
newLegislation.Parliament = db.LegislativeSessions.First(p => p.Ending >= DateTime.Today);
newLegislation.Sponsor = db.Members.Single(m => m.Username == HttpContext.Current.User.Identity.Name);
// And save
db.Legislations.Add(newLegislation);
db.SaveChanges();
// Check for Short titles
this.IncludeShortTitle(newLegislation);
// return the saved legislation
return newLegislation;
}
And the second function which is invoked by the first one deals with checking whether ShortTitle is not empty and create a Provision that is related to that Legislation, then save changes.
public void IncludeShortTitle(Legislation legislation)
{
var savedLegislation = db.Legislations.Find(legislation.LegislationID);
if (savedLegislation.ShortTile.Any() && savedLegislation.ShortTile.ToString().Length >= 5)
{
string shortTitle = "This Act may be cited as the <i>" + savedLegislation.ShortTile.ToString() + "</i>.";
var provision = new Provision()
{
Article = Numbers.CountOrNull(savedLegislation.Provisions) + 1,
Proponent = savedLegislation.Sponsor,
Text = shortTitle
};
savedLegislation.Provisions.Add(provision);
db.SaveChanges();
}
}
I've been researching how SaveChanges() works and whether it is properly returning the updated entity, it does (since I get no issue looking it up in the second function). If it works properly, and the legislation is found and the provision is newly created in the second function, I don't see what is the "null" reference it keeps spitting out.
The null reference in this case would be savedLegislation.Provisions. The Provisions collection won't be initialized to a new List<Provision> when EF returns your Legislation instance from the db.Legislations.Find(...) method.
The first thing I'd try is something like this:
var savedLegislation = db.Legislations
.Include("Provisions")
.First(l => l.LegislationID == legislation.LegislationID);
... but I'd also consider just using the legislation instance that was passed into the method rather than fetching it from the database again.
I have a controller that stores various info (Ie. FormID, QuestionAnswerList, etc). Currently I am storing them in the Controller.Session and it works fine.
I wanted to break out some logic into a separate class (Ie. RulesController), where I could perform certain checks, etc, but when I try and reference the Session there, it is null. It's clear that the Session remains valid only within the context of the specific controller, but what is everyone doing regarding this?
I would imagine this is pretty common, you want to share certain "global" variables within the different controllers, what is best practice?
Here is a portion of my code:
In my BaseController class:
public List<QuestionAnswer> QuestionAnswers
{
get
{
if (Session["QuestionAnswers"] == null)
{
List<QuestionAnswer> qAnswers = qaRepository.GetQuestionAnswers(CurrentSection, UserSmartFormID);
Session["QuestionAnswers"] = qAnswers;
return qAnswers;
}
else
{
return (List<QuestionAnswer>)Session["QuestionAnswers"];
}
}
set
{
Session["QuestionAnswers"] = value;
}
}
In my first Controller (derived from BaseController):
QuestionAnswers = qaRepository.GetQuestionAnswers(CurrentSection, UserSmartFormID);
I stepped through the code and the above statement executes fine, setting the Session["QuestionAnswers"], but then when I try to get from another controller below, the Session["QuestionAnswers"] is null!
My second controller (also derived from BaseController):
List<QuestionAnswer> currentList = (List<QuestionAnswer>)QuestionAnswers;
The above line fails! It looks like the Session object itself is null (not just Session["QuestionAnswers"])
does it make a difference if you retrieve your session using
HttpContext.Current.Session("mySpecialSession") ''# note this is VB, not C#
I believe TempData will solve your problem, it operates with in the session and persists across multiple requests, however by default it will clear the stored data once you access it again, if that's a problem you can tell it to keep the info with the newly added Keep() function.
So in your case:
...
TempData["QuestionAnswers"] = qAnswers;
...
There's much more info at:
http://weblogs.asp.net/jacqueseloff/archive/2009/11/17/tempdata-improvements.aspx
Where are you accessing the session in the second controller? The session object is not available in the constructor because it is injected later on in the lifecycle.
Ok, finally got it working, although a bit kludgy. I found the solution from another related SO post.
I added the following to my BaseController:
public new HttpContextBase HttpContext
{
get
{
HttpContextWrapper context =
new HttpContextWrapper(System.Web.HttpContext.Current);
return (HttpContextBase)context;
}
}
Then set/retrieved my Session variables using HttpContext.Session and works fine!