PromiseKit | Promises for Swift & ObjC | Reactive Programming library

Might I be so inclined to ask for a hand and or different perspectives on how to Unit Test a function on my Viewcontroller that calls an HTTP request to a Back End server using promise kit which returns JSON that is then decoded into the data types needed and then mapped.

This is one of the promise kit functions (called in viewWillAppear) to get stock values etc...

I'm looking for an operator that does the opposite of the collect operator:

• Allows you to map from one emission value to many emission values, emitting them on the stream. For example if I have the element [1,2,3] in the stream, I want to convert it into a stream that emits 1 then 2, then 3.
• Does not change the stream's completion state. Admittedly this uncollect operator wouldn't be exactly the opposite of collect since collect waits until the stream is finished. With uncollect it should just process results while the stream is unfinished, and not attempt to finish/unfinish the stream.

For example, I imagine this is how an uncollect operator would function:

I'm using PromiseKit in my project and I need to do batch/multiple calls to the API and wait for all responses. Any ideas how to do this? I'm pretty new to PromiseKit, and didn't find anything regarding this on their Github (probably didn't see or understand it)

What I'm trying at the moment and failing is:

I'm trying to get data from the network request using PromiseKit in the following code below, but on the line seal.fulfill(data) I'm getting the error 'Cannot invoke 'fulfill' with an argument list of type '(Data)''. Can anyone please give me a hint on what am I doing wrong?

while i am trying to decode some json data using Alamofire and PromiseKit, I am encountering some unstable error message.. why I am saying " unstable error message is that sometimes when I hit the API .GET request, i am getting the response in full format, without any error, but after a couple of times running the application Xcode throwing an Alamofire Response Serialization Error which is so confusing.. . I have implemented Coding keys too, data and json response formats are also in right format.. can anyone please help me decode this error message .?

here is the response i got from the API in one of random application run:

and after the next run, here is the error message from the xcode console:

I am using AlamoFire and PromiseKit to do API calls.

The code was working fine for 2 years until I updated to Xcode 12.0.

Function now returning the error: "Cannot convert value of type 'DataRequest' to closure result type 'Void'"

My function is as follows:

Hello everyone I want to crate a base api service for my apps but when I try a lot of different way but i can't solve my problems. I have to use alamofire, promiseKit and generic's.

My first solution and his issue: I can get my json from api but when I try to decode my json every time it fails. There is the code:

I'm new to PromiseKit however I can't get something very basic to work. Consider this:

I'm working with firebase and I have a function which returns a promise from a document reference.