Setting an array to empty not working

[AnthonyMDev]

When trying to set an array nested in my JSON to an empty array, nothing is happening.

let json =  JSON(["array": [1, 2, 3]])

json["array"] =  JSON([]) 
json["array"].array = JSON([])
json["array"].arrayObject = []

print(json) // ["array": [1, 2, 3]]

I currently have to do this to get it to properly set the array:

var json =  JSON(["array": [1, 2, 3]])

var dict = json.dictionaryObject
dict["array"] = []
json = JSON(dict)

This error is occurring using version 3.1.4.

[JeffGuKang]

Is this typo? You did not close the bracket in
var json = JSON(["array": [1, 2, 3])

[AnthonyMDev]

Sorry. Yes, those were typos. I've fixed the typos. The bug report is valid.

[wongzigii]

Pretty strange behavior. 🤔

mutable["mutable"] = [1, 2, 3] // this works
XCTAssertEqual(mutable["mutable"], [1, 2, 3])

mutable["mutable"] = [] // this fails
XCTAssertEqual(mutable["mutable"], [])

[AnthonyMDev]

In my use case, I was setting the array to an empty array. I didn't realize that this behavior only occurred in that situation. Good to know.

[MikotoZero]

Maybe i find what happend
[] has been convert to type [JSON]

There is a bug in v3.1.4
object's setter never assign to rawArray when it is [JSON]

              case _ as [JSON]:
                _type = .array
            case nil:
                _type = .null
            case let array as [Any]:
                _type = .array
                self.rawArray = array

This bug fixed in #743 and #793

[wongzigii]

Hey @MikotoZero Thanks for your PR, I will review this If I have some spare time at this weekend. :)

[wongzigii]

#793 has been merged into master.

I've added a MutabilityTests to track down these use cases.

Cheers.