CODEWITHSUNDEEP
iosswiftfirebasedictionarygoogle-cloud-firestore
devios
devios

Reputation: 235

App crashes when saving a dictionary object in Firestore

I was trying to save my quiz data into firestore like so

db.collection("Quizzes").addDocument(data: ["Author": userEmail,
                                                    "quizTitle": quizTitle,
                                                    "quizDescription": quizDescription,
                                                    "quizDictionary": quizDictionary]) { (error) in
                                                        if let e = error{
                                                            print("There was an erorr saving the data to the Firestore \(e)")
                                                        }

after clicking the button that would perform this block of code my app crashes and the following error is printed

020-09-19 17:17:46.367783+0800 Quizzler[18001:782362] -[__NSCFNumber length]: unrecognized selector sent to instance 0xc4cd28a1a98b5156 2020-09-19 17:17:46.469546+0800 Quizzler[18001:782362] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFNumber length]: unrecognized selector sent to instance 0xc4cd28a1a98b5156'

After doing some debugging, I found out that the "quizDictionary": quizDictionary part is what's causing the crash. Why is this happening? I thought that the method .addDocument(data: ) accepts [String: Any]?

If it is impossible to save Dictionary object into firestore, what are some workarounds for this?

If needed, this is my dictionary's declaration dictionary declaration

Upvotes: 1

Views: 429

Answers (2)

Md Hanif
Md Hanif

Reputation: 1107

Hey have a look here at the documentation for adding and managing data in fireStore :- https://cloud.google.com/firestore/docs/manage-data/add-data#swift.

Quick Overview line :- Using Map or Dictionary objects to represent your documents is often not very convenient, so Firestore supports writing documents with custom classes. Firestore converts the objects to supported data types.

Update :- As mentioned in comments it does not just convert any random object into a supported type. If you throw an NSImage at it, it won't know what to do with that. Or if the object contains some other random object it won't work. It has to contain supported types only. You can refer to this link to understand more about the supported data types.

Upvotes: 1

slushy
slushy

Reputation: 12385

You can only read and write supported data types with Firestore:

  • arrays
  • booleans
  • bytes
  • Firestore date objects
  • floating-point numbers
  • Firestore geographical objects
  • integers
  • maps (dictionaries, with string keys and values only of these supported types)
  • nil
  • Firestore references
  • strings

Therefore, you must convert your custom object to a format that is recognizable to Firestore which means replacing custom types with types that are primitive to the database.

https://firebase.google.com/docs/firestore/manage-data/data-types

Upvotes: 1

Related Questions