I am using in my App cloudKit + Core Data in my App (iOS 13+) (swift).
I cannot figure out how to detect very first run of the app regardless of device to initialize some default data.
There are many posts how to detect first launch of a iOS app on specific device - that's easy. I cannot find solution for detecting the first run of app for specific user or in other words - if in user's iCloud does exist initialized container with specific containerIdentifier.
If user had already used the app on another device before, so during first launch on new device, there will be sync with iCloud and app will use user's data. But if the user has never used the app before I need to initialize some data.
I am searching for clue how to deal with it for hours, cannot find nothing relevant.
Any idea?
Thanks for help in advance.
A bit more information on your cloudkit schema would help, but assuming you are using a publicDB to store information, a unique record will be create for the user when they first take an action that saves data to cloudkit.
So you could check and look at the createDate timestamp of the User object in cloudkit and compare to the current time (a bit clunky, but possible).
Example code to fetch the user:
iCloudUserIDAsync { (recordID: CKRecord.ID?, error: NSError?) in
if let userID = recordID?.recordName {
self.loggedInUserID = userID
self.loggedInWithiCloud = true
} else {
self.loggedInWithiCloud = false
print("Fetched iCloudID was nil")
}
}
Alternatively, and more elegantly, you could write a boolean flag to the user object CloudKit (or locally in CoreData) on first launch. Then on any launch get the entire user object for the logged in iCloud user, you can then initialize it and then act on your Boolean variable from there.
Example code to get the full user and initialize it locally:
CKContainer.default().publicCloudDatabase.fetch(withRecordID: userRecordID) { (results, error ) in
if results != nil {
//now that you have the user, you can perform your checks
self.currentUser = MyUser(record: results!)
}
if let error = error {
print("couldn't set user reference")
}
DispatchQueue.main.async {
completion(nil)
}
}
Related
I am building an application using node.js and socket.io. I would like to create a table of users who are actively browsing the site at any given moment, which will update dynamically.
I am setting a cookie to give each browser a unique ID, and have a mysql database of all users (whether online or not); however, I'm not sure how best to use these two pieces of information to determine who is, and who isn't, actively browsing right now.
The simplest way would seem to be to store the cookie & socket IDs in an array, but I have read that global variables (which presumably this would have to be) are generally bad, and to be avoided.
Alternatively I could create a new database table, where IDs are inserted and deleted when a socket connects/disconnects; but I'm not sure whether this would be overkill.
Is one of these methods any better than the other, or is there a way of tracking this information which I haven't thought of yet?
You can keep track of active users in memory without it being a global variable. It can simply be a module level variable. This is one of the advantages of the nodejs module system.
The reasons to put it in a database instead of memory are:
You have multiple servers so you need a centralized place to put the data
You want the data stored persistently so if the server is restarted (normally or abnormally) you will have the recent data
The reasons for not putting it directly in a database:
It's a significant load of new database operations since you have to update the data on every single incoming request.
You can sometimes get the persistence without directly using a database by logging the access to a log file and then running chron jobs that parse the logs and do bulk addition of data to the database. This has a downside in that it's not as easy to query live data (since the most recent data is sitting in databases and hasn't been parsed yet).
For an in-memory store, you could do something like this:
// middleware that keeps track of user access
let userAccessMap = new Map();
app.use((req, res, next) => {
// get userId from the cookie (substitute your own cookie logic here)
let id = id: req.cookie.userID;
let lastAccess = Date.now();
// if you want to keep track of more than just lastAccess,
// you can store an object of data here instead of just the lastAccess time
// To update it, you would get the previous object, update some properties
// in it, and then set it back in the userAccessMap
userAccessMap.set(id, lastAccess);
next();
});
// routinely clean up the userAccessMap to remove old access times
// so it doesn't just grow forever
const cleanupFrequency = 30 * 60 * 1000; // run cleanup every 30 minutes
const cleanupTarget = 24 * 60 * 60 * 1000; // clean out users who haven't been here in the last day
setInterval(() => {
let now = Date.now();
for (let [id, lastAccess] of userAccessMap.entries()) {
if (now - lastAccess > cleanupTarget) {
// delete users who haven't been here in a long time
userAccessMap.delete(id);
}
}
}, cleanupFrequncy);
// Then, create some sort of adminstrative interface (probably with some sort of access protection)
// that gives you access to the user access info
// This might even be available in a separate web server on a separate port that isn't open to the general publoic
app.get("/userAccessData", (req, res) => {
// perhaps convert this to a human readable user name by looking up the user id
// also may want to sort the data by recentAccess
res.json(Array.from(userAccessMap));
});
in the main dialog, I have used this to get the details of the user activity and session ID stepContext.context._activity
and I am able to store the data in JSON format,
I want to know how to use the previous text of the user for the next query if there is no entity present in that and it should work for multiple users, not for a single user.
The location of the user's input varies depending on the option provided to them. Simple text input is available in the stepContext.context.activity.text field. However, the user's returned value could, for example, exist in:
stepContext.result, if a hero card is used
stepContext.options, if a value is forwarded on from a previous step or action
stepContext.context.activity.text, if a suggested action is used
stepContext.context.activity.value, if a postBack is returned
There are a few other possibilities. Referencing the docs is a good place to start as are the BotBuilder-Samples for getting a grasp on all the possibilities. Don't be averse to inspecting the stepContext to see how it is populated and with what.
async firstStep(stepContext) {
await stepContext.context.sendActivity('Type something...');
return { status: DialogTurnStatus.waiting };
}
async secondStep(stepContext) {
const result = stepContext.context.activity.text;
return await stepContext.context.sendActivity(`You said: ${ result }`);
Hope of help!
I am trying to build a logging mechanism, to log changes done to a record. I am currently logging previous and new record. However, as the site is very busy, I expect the logfile to grow seriously huge. To avoid this, I plan to only capture the modified fields only.
Is there a way to capture only the modifications done to a record (in REACT), so my {request.body} will have fewer fields?
My Server-side is build with NODE.JS and the client-side is REACT.
One approach you might want to consider is to add an onChange(universal) or onTextChanged(native) listener to the text field and store the form update in a local state/variables.
Finally, when a user makes an action (submit, etc.) you can send the updated data to the logging module.
The best way I found and works for me is …
on the api server-side, where I handle the update request, before hitting the database, I do a difference between the previous record and {request.body} using lodash and use the result to send to my update database function
var _ = require('lodash');
const difference = (object, base) => {
function changes(object, base) {
return _.transform(object, function (result, value, key) {
if (!_.isEqual(value, base[key])) {
result[key] = (_.isObject(value) && _.isObject(base[key])) ? changes(value, base[key]) : value;
}
});
}
return changes(object, base);
}
module.exports = difference
I saved the above code in a file named diff.js and included it in my server-side file.
It worked good.
Thanks for giving the idea...
so I'm creating a bot using Node.JS / Discord.JS and I have a question.
On some servers, when you mention a user, it returns in the console as <#!userid> and on other it returns as <#userid>.
My bot has a simple points / level system, and it saves in a JSON file as <#!userid>, so on some servers when trying to look at a users points by mentioning them will work, and on others it won't.
Does anyone have any idea how to fix this? I've tried to find an answer many times, and I don't want to have it save twice, once as <#!userid> and then <#userid>. If this is the only way to fix it then I understand.
Thanks for your help!
The exclamation mark in the <#!userID> means they have a nickname set in that server. Using it without the exclamation mark is more reliable as it works anywhere. Furthermore, you should save users with their id, not the whole mention (the "<#userid>"). Parse out the extra symbols using regex.
var user = "<#!123456789>" //Just assuming that's their user id.
var userID = user.replace(/[<#!>]/g, '');
Which would give us 123456789. Their user id. Of course, you can easily obtain the user object (you most likely would to get their username) in two ways, if they're in the server where you're using the command, you can just
var member = message.guild.member(userID);
OR if they're not in the server and you still want to access their user object, then;
client.fetchUser(userID)
.then(user => {
//Do some stuff with the user object.
}, rejection => {
//Handle the error in case one happens (that is, it could not find the user.)
});
You can ALSO simply access the member object directly from the tag (if they tagged them in the message).
var member = message.mentions.members.first();
And just like that, without any regex, you can get the full member object and save their id.
var memberID = member.id;
Is there any possibility to do this ?
I'd like to identify the user and one easy way is to save GUID that is automatically visible on other devices with same MS Account.
You can use roaming settings for this
var roamingSettings = Windows.Storage.ApplicationData.Current.RoamingSettings;
// Create a simple setting
roamingSettings.Values["exampleSetting"] = "Hello World";
// Read data from a simple setting
Object value = roamingSettings.Values["exampleSetting"];
if (value == null)
{
// No data
}
else
{
// Access data in value
}
// Delete a simple setting
roamingSettings.Values.Remove("exampleSetting");
https://msdn.microsoft.com/en-us/library/windows/apps/windows.storage.applicationdata.roamingsettings.aspx?cs-save-lang=1&cs-lang=csharp#code-snippet-2
Oh my...
I spent half a day reading forums and suddenly found an answer, right after posting SO Queston :( Sorry.
Microsoft has good buch of Win10 samples, and one of them describes ApplicationData.Roaming -
https://github.com/Microsoft/Windows-universal-samples/tree/master/Samples/ApplicationData
Any file that is put to this folder is synced to other devices automatically.