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QUESTION
I have a situation where my code needs to make one network call to fetch a bunch of items, but while waiting for those to come down, another network call might fetch an update to those items. I'd love to be able to enqueue those secondary results until the first one has finished. Is there a way to accomplish that with Combine?
Importantly, I am not able to wait before making the second request. It’s actually a connection to a websocket that gets made at the same time as the first request, and the updates come over the websocket outside of my control.
UpdateAfter examining Matt’s thorough book on Combine, I settled on .prepend(). But as Matt warned me in the comments, .prepend() doesn’t even subscribe to the other publisher until after the first one completes. This means I miss any signals sent prior to that. What I need is a Subject that enqueues values, but perhaps that’s not so hard to make. Anyway, this is where I got:
Initially I was going to use .append(), but I realized with .prepend() I could avoid keeping a reference to one of the publishers. So here’s a simplified version of what I’ve got. There might be syntax errors in this, as I’ve whittled it down from my (employer’s) code.
There’s the ItemFeed, which handles fetching a list of items and simultaneously handling item update events. The latter can arrive before the initial list of items, and thus must be sequenced via Combine to arrive after it. I attempt to do this by prepending the initial items source to the update PassthroughSubject.
Below that is an XCTestCase that simulates a lengthy initial item load, and adds an update before that load can complete. It attempts to subscribe to changes to the list of items, and tries to test that the first update is the initial 63 items, and the subsequent update is for 64 items (in this case, “update” results in adding an item).
Unfortunately, while the initial list is published, the update never arrives. I also tried removing the .output(at:) operators, but the two sinks are only called once.
After the test case sets up the delayed “fetch,” and subscribes to changes in feed.items, it calls feed.handleItemUpatedEvent. This calls ItemFeed.updateItems.send(_:), but unfortunately that is lost to oblivion.
ANSWER
Answered 2021-Jun-06 at 08:06After a fair bit of trial and error, I found a solution. I created a custom Publisher and Subscription that immediately subscribes to its upstream publisher and begins enqueuing elements (up to some specifiable capacity). It then waits for a subscriber to come along, and provides that subscriber with all the values up until now, and then continues providing values. Here’s a marble diagram:
I then use this in conjunction with .prepend() like so:
QUESTION
At Oracle I would like to filter below TABLE as
COLUMNA COLUMNB COLUMNC 19 AAA PRIMARY 20 AAA PRIMARY 8 AAA SECONDARY 7 AAA SECONDARY 7 AAA PRIMARY 8 AAA SECONDARY 9 AAA SECONDARYmy expected output is
COLUMNA COLUMNB COLUMNC 19 AAA PRIMARY 20 AAA PRIMARY 7 AAA PRIMARY 9 AAA SECONDARYLogic is Group by COLUMNA and COLUMNB (please evaluate below conditions on grouping.)
- if columnc candidate record (grouped by
COLUMNAandCOLUMNB) includes onlyPRIMARYtakePRIMARY. - if columnc candidate record (grouped by
COLUMNAandCOLUMNB) includes onlySECONDARYtakeSECONDARY. - if columnc candidate records (grouped by
COLUMNAandCOLUMNB) includePRIMARYandSECONDARYset, takePRIMARY. - if columnc candidate records (grouped by
COLUMNAandCOLUMNB) include duplicateSECONDARYset skip record. - imagine this row has 100 columns so I need to fetch row by itself. MAX MIN wont work here.
I have used couple of row_number() functions and where not exists but went into oblivion.
ANSWER
Answered 2021-May-07 at 13:21It looks like aggregation does what you want:
QUESTION
I'm going to post this question and answer tomorrow, as it's 2am here... So sorry in advance.
I'm web scraping from this particular page:Italian Website
What I'm having difficulty with is the scraping of information that is between tags that have been used many time, basically making them 1 in 1000.
Here is the part of code I need (I need the price):
...ANSWER
Answered 2021-Apr-25 at 00:08You can use this code to crawl all pages and extract links, titles and prices + create a dataframe and save it to csv:
QUESTION
I have a state in react called options that looks like:
...ANSWER
Answered 2021-Feb-27 at 08:47It doesn't seem you are returning the outer elements being mapped.
QUESTION
Okay, I have to recode a df, because I want factors as integers:
...ANSWER
Answered 2020-Sep-28 at 14:25You may use `NA`.
QUESTION
I have three lists namely names, artists, and albums. I want to create a csv such that the first elements of each is in one row, and then next element in other and so on.
For eg.
...ANSWER
Answered 2020-Aug-10 at 00:38Your list have invalid strings. If you have single quote(') inside the string, then you need to wrap your strings with double quote(").
You can try:
QUESTION
I understand that this question has been asked to oblivion, but I havent been able to solve my particular issue with it.
When I started my project, I had cors error too, but after adding the following they dissapeared, until today I decided to refractore the code of an app, and it suddenly stopped working, fun fact is that the old code was working ok.:
...ANSWER
Answered 2020-May-01 at 17:05Ok so the problem is that res.sendStatus() is not working for some reason, I switched to res.send("string") and it does the trick
QUESTION
I would like to get each key value pair in the results object from my api to display on my front-end. ie(category, type, difficulty, questions correct_answer) I have the service and components set up correctly and all i need to do is fetch the json and display each pair. The method name is called fetchQuestions as seen below. I was able to successfully get data by just simply calling it the same way I did fetchPeople but the json format is not the same so it's not displaying. I then tried something else but that's not working either. How can I acheive displaying this?
People.service
...ANSWER
Answered 2020-Apr-29 at 22:09The HTTP GET is a cold observable. As such each async will fire an individual request. Besides you aren't actually returning the observable from the fetchQuestions() function. The subscription should be removed.
You could also use Angular HttpParams to set the query parameters and do things the Angular way.
Try the following
Service
QUESTION
I am using the TMDb API to get data for my program in VB and I am trying to get an array of all the ids of the movies returned from the raw response of JSON, but it keeps coming up with an error. my code is in VB.net and my code looks like this:
...ANSWER
Answered 2020-Mar-17 at 20:51Your results are in an array - a list of Movies.
Try changing the type on this from As String to As JObject and then working with the results from there.
Dim obj2 As String = JObject.Parse(obj.SelectToken("results"))
QUESTION
Slightly afraid of down-votes as this could be seen as a matter of opinion, but it's not clear how or where else to post this on Stack Exchange, so here I go... I certainly think it's a question that adds value here, at least.
I've recently been reading into Javascript's Map datatype (NOT the map() array method). MDN Reference
I've read and followed various tutorials/articles showing the similarities and differences between Maps, Arrays and 'standard' Objects. One unique property of Maps is that you can use any datatype as a key, including an Object.
There are many examples out there, such as this one from Tania Rascia
...ANSWER
Answered 2020-Feb-19 at 10:00From my tweets on the subject:
Say you have an object (like a DOM element) that you want to associate some data with, but you don't want to modify the object to add the data directly to it. So you use a Map with the object as key and your associated data as value.
typically, you'd want to use a WeakMap for this, so that if the original object goes away (GCd) the data is also released.
but a reason to use map instead of weakmap is that map is iterable and weakmap isn't.
so if you're willing to trade out that you need to do more manual work to manage the map entries (for cleaner GC), then you get the ability to enumerate all the entries of the map, which can be useful in certain cases.
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