Array append not working on Swift

Question

I have this function, but when I run:

theRecipes.append(theRecipe);

...the size of the array 'theRecipes' is exactly the same. I share you the code so you can overview what I'm trying to do on Swift Language.

func retrieveAll() -> [Recipe] {
    var query = PFQuery(className: RECIPE_PARSE_CLASSNAME);
    var theRecipes: [Recipe] = [Recipe]();

    query.findObjectsInBackgroundWithBlock {(objects: [AnyObject]!, error: NSError!) -> Void in

        if (error == nil) {
            // The find succeeded.
            println("Successfully retrieved \(objects.count) recipes.");

            // Do something with the found objects
            if let recipes = objects as? [PFObject] {
                for recipe in recipes {
                    let theRecipe: Recipe = Recipe();
                    theRecipe.name = recipe[RECIPE_PARSE_NAME_NAME] as String;
                    theRecipe.about = recipe[RECIPE_PARSE_ABOUT_NAME] as String;
                    theRecipe.cover = recipe[RECIPE_PARSE_COVER_NAME] as String;
                    theRecipe.preview = recipe[RECIPE_PARSE_PREVIEW_NAME] as String;

                    println(theRecipe.name);
                    theRecipes.append(theRecipe);
                }
            }
        } else {
            // Log details of the failure
            println("Error: \(error) \(error.userInfo!)");
            Bugsnag.notify(nil, withData: ["data": error.description]);
        }
    };

    return theRecipes;
}

What I'm trying to do is collect every PFObject to translate it to my own Model class and for managing it that way while in memory. So I translate it and append it to the array to deliver it fulfilled with recipes.

I want to make clear that I already checked that I'm successfully retrieving every object from Parse and they're not null.

You can't return the array like this from a method that uses an asynchronous method to fetch the data. The return statement will run immediately, before the block in findObjectsInBackgroundWithBlock is executed. — rdelmar
– rdelmar, Commented Mar 31, 2015 at 0:23
You're completely right. I'll fix it right now. But even so, is it normal that when I'm debugging a line after the append the array has still 0 elements? — Sergio Daniel L. García
– Sergio Daniel L. García, Commented Mar 31, 2015 at 0:32
Did you do that in the debugger or with a log? If you log theRecipes in the line right after you append it, it should show the correct number of elements. — rdelmar
– rdelmar, Commented Mar 31, 2015 at 1:05
How come Parse "fetchInBackground" questions are becoming as prevalent as Java string comparison with == questions? — nhgrif
– nhgrif, Commented Mar 31, 2015 at 1:52
@rdelmar What would be a solution instead? I'm having the same issue where I need to return an array from an asynchronous method. — Lightsout
– Lightsout, Commented Aug 12, 2015 at 8:00

Sergio Daniel L. García · Accepted Answer · 2015-03-31 03:57:03Z

This was my solution:

func retrieveAll(returner: (Array<Recipe>) -> Void) {
    var query = PFQuery(className: RECIPE_PARSE_CLASSNAME);
    var theRecipes: Array<Recipe> = Array<Recipe>();

    query.findObjectsInBackgroundWithBlock {(objects: [AnyObject]!, error: NSError!) -> Void in

        if (error == nil) {
            // The find succeeded.
            println("Successfully retrieved \(objects.count) recipes.");

            // Do something with the found objects
            if let recipes = objects as? [PFObject] {
                for recipe in recipes {
                    let theRecipe: Recipe = Recipe();
                    theRecipe.name = recipe[RECIPE_PARSE_NAME_NAME] as String;
                    theRecipe.about = recipe[RECIPE_PARSE_ABOUT_NAME] as String;
                    theRecipe.cover = recipe[RECIPE_PARSE_COVER_NAME] as String;
                    theRecipe.preview = recipe[RECIPE_PARSE_PREVIEW_NAME] as String;

                    println(theRecipe.name);
                    theRecipes.append(theRecipe);
                }

                returner(theRecipes);
            } else {
                println();
                returner(Array<Recipe>());
            }
        } else {
            // Log details of the failure
            println("Error: \(error) \(error.userInfo!)");
            Bugsnag.notify(nil, withData: ["data": error.description]);
            returner(Array<Recipe>());
        }
    };
}

Using a returner method to deliver my mapped recipes asynchronously.

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