resolveLinksArray returns array of NSNulls

[pzmudzinski]

• contentful.swift version number: 5.4.1
• Xcode version number: 12.3
• Target operating system(s) and version number(s)
  • iOS:
  • tvOS:
  • watchOS:
  • macOS:
• Package manager:
  • Carthage
  • Cocoapods

I've got entry with one-to-many array of some other entries. Trying to decode it like that:

try fields.resolveLinksArray(forKey: .possibleAnswers, decoder: decoder) { [weak self] answers in ... }

I've registered both types of entries in contentTypeClasses, I've got the same code working for other entries but for some reason one specific type causes this issue (it's not even reaching constructor) - it shows correct number of entries but all of them are NSNull without any error message or explanation what's going on:

What could be causing that? How are we supposed to debug any decoding issues? Why it isn't giving any information what could be an issue?

In addition if I try to fetch one record of that type everything works:

client.fetch(typeOfPossibleAnswers, id: "...") { result in
                print("result \(result)") // success! 
            }

[pzmudzinski]

One thing to add is the structure is like that:
there is entity A, which has array of entities B, and each entity B has another array of entities C.
If I fetch entity B - it works and I see it decodes array of entities C.
If I fetch entity A, it decodes entities B but it does not reach to decoding any of C.

Does this SDK not support nested links at depth 2?

[pzmudzinski]

Ok after digging into the code I think I've found Query.include method which manages "depth" of that fetch.
So solution was to use myQuery.include(3).

I think this is something which should be added to Readme - I couldn't find any info on that and default behavior withNSNulls seems to be weird.

[mariuskurgonas]

Hey @pzmudzinski ,

Thanks you for the feedback and great that in the end you found the solution. I will make sure this is added to the documentation going forwards.

I will also look into why does it return the array of nulls in case the depth level is not specified. I think i generally understood your use case and setup with arrays within arrays. Would you be able to share a simple working example of the code that would help me see the complete picture of your setup and help me in reproducing exactly the way you tried it?

[marius-se]

I had the exact same issues. The Query.include really helped me a lot. Thanks @pzmudzinski for pointing that out!

...Interesting: If the key is representing an Asset value, everything works just fine. Is there a reason for that? Let's say I have:

-states: [State]
--facilities: [Facility]
---address: Address
---image: Asset

Without specifying the Query.include the image property will be resolved while the address won't.

[pzmudzinski]

@marius-se It took me like 5 hours to figure it out so appreciate your comment 😂
@mariuskurgonas nothing fancy, just use Client and do an query for entity with nested arrays, just like in my A-B-C example

[leonardopantaleao]

I hope I can save someone else's time:
EntryType = the class type you're struggling to get the array with arrays
let query = QueryOn<EntryType>.include(3)
client.fetchArray(of: EntryType.self, matching: query) { response in
...