I'm using the ptv api call for departures and can successfully return back three results. I'm trying to get Siri to dictate these to me in order but am not having much luck.
When the api is called it returns a bunch of information in an array for however many services you specify (three in my case), but I only want one of the lines to be dictated (scheduled_departure_utc), not the full array.
And I want to pull just this one line out of each of the three blobs of data that are returned so that Siri says...
the next trains to the city are (scheduled_departure_utc),(scheduled_departure_utc),(scheduled_departure_utc). Where (scheduled_departure_utc) is a short form of time (8:28am, 8:38am, 8:58am) as an example.
Any ideas?
Related
I'm using Firebase for my iOS application and I'm having trouble implement infinite scroll and filtering data together.
What I need to do is:
Display items with order/filter on multiple property (location, category, status . . .)
Implement infinite scroll when the user scrolled to bottom of the screen.
I tried to think about some solutions:
The first, I think that I'll query the data with the necessary conditions then limit the number of records by use queryLimitedToFirst(N), and increase N when need to load the next items. But because Firebase can only filter on one property at a time and it's also a waste to reload data. So, I was thinking about the second solution.
As approaches are suggested from Frank van Puffelen (Query based on multiple where clauses in firebase):
filter most on the server, do the rest on the client
Yes, exactly like that. I'll execute queryOrderedByKey, queryStartingAtValue, queryEndingAtValue to implement infinite scroll, pull down the remaining data and filter that on client. But there is one problem that is I would not have enough items to display for the user if execute filter on the client.
For example: each time run the query, I receive 10 items. After data filtering process on the client, I just left 5 (can be 0) items meet the conditions to display to the user.
I don't want this because user may think there is a problem
Can I please get some pointers on this? If I didn't structured the data properly, can I also get some tips there?
Is there any way to give Google Maps API or a similar API a town name and have it return a random address inside the town? I was hoping to be able to get the data as a JSON so I could parse it with SwiftyJSON in XCode and use it, but I can't seem to find any way to get the address in the first place. If coordinates would be easier to get, then those would work too, as long as its random and inside the town borders.
You can try to use Google Places API Web Service. It allows you to query for place information on a variety of categories, such as: establishments, prominent points of interest, geographic locations, and more. You can search for places either by proximity or a text string. A Place Search returns a list of places along with summary information about each place.
A Nearby Search lets you search for places within a specified area. You can refine your search request by supplying keywords or specifying the type of place you are searching for.
A Nearby Search request is an HTTP URL of the following form:
https://maps.googleapis.com/maps/api/place/nearbysearch/output?parameters
where output may be either xml or JSON values.
And if you want either address or coordinates, you can use Geocoding for it. Here i found a tutorial on how to use Geocoding in IOS.
I'm working on a pet project using parse as a back end. I'm setting up a viewcontroller that contains a list of people you can possibly add as "friends"; these are people that
a) exist in your contacts list and
b) have already downloaded the app and signed up.
Different buttons will be displayed depending on their status as a user (invite button if they only exist in your contacts list, add to friends button if they're also using the app already).
I'm trying to keep my Parse account to 30 requests/second so that I'm not out of pocket for a pet app.
One way I've thought to figure out who is registered as a user AND who exists in my contacts list is to loop through the contacts list on my phone and query that phone number on parse. However, this would obviously go over my limit on requests/second.
Is there a way (I've looked through Parse documentation and googled it) to take an array (list of contacts on my phone) and run a PFQuery ON THAT ARRAY, checking each object and returning matches?
Unless you have a quarter million users in your app you shouldn't be much concerned, it doesn't work like: 1 user goes through 30 count for loop with one query each and you get 30 req/s:
How does the requests/second limit translate to concurrent users?
Generally when your user count doubles, your requests per second also double. However, different apps send different numbers of requests per second depending on how frequently they save objects or issue queries. We estimate that the average app's active user will issue 10 requests. Thus, if you had a million users on a particular day, and their traffic was evenly spread throughout the day, you could estimate your app would need about 10,000,000 total API requests, or about 120 requests per second. Every app is different, so we strongly encourage you to measure how many requests your users send.
I have run through loops of requests and I barely hit 1 req/s
Is there a way (I've looked through Parse documentation and googled
it) to take an array (list of contacts on my phone) and run a PFQuery
ON THAT ARRAY, checking each object and returning matches?
Yes there is, use:
query?.whereKey(key: String, containedIn: [AnyObject])
I want to make some Rails API for a mobile app, and there is the following situation: my app will authorize using a phone number (like Viber / WhatsApp); also it can automatically detect which contacts from a phone book also have my app installed. If I understand right I should create some GET method to take array of numbers and return numbers of users which have been in my system already. There are no problem with GET method for me and arrays in GET params, but phone book of users can be very big, and sending all numbers in GET params is not good solution. How can I do it right? Should I divide numbers in parts and send first 10 numbers, then next 10 numbers etc? Thanks in advance.
Just use a POST request instead. You don't have to always use GET when you're searching for stuff.
You could also optimize your query string:
?ph=5551112222,5552223333...
This at least minimizes the request size. I think Rails should give you params[:ph] as an array. If not then splitting the string on a comma is just one extra line of code.
I have a very large data set (about 16k rows). I have 10 higher level blocks and within each block I have 4 categories (10 rows for each) which use Data Validation lists to show items available in each category. The lists should automatically update based on user input. What I need your help with is that I want to use the same data set for each block and preferably a least calculation/size intensive approach. I have put together a sample file that outlines the issue with examples.
Sample File
Thank you for your help in advance.
Okay, I've found something, but it can be quite time consuming to do.
Select each range of cells. For instance, for the first one, select B3:B18 and right click on the selection. Find 'Name a Range..." and give it the name "_FIN_CNY". Repeat for all the other ranges, changing the name where necessary.
Select the first range of cells to get the data validation, and click on "Data validation", pick the option "Allow: List" (you already have it) and then in the source, put the formula:
=INDIRECT($G$4&"_CNY")
$G$4 is where the user will input. This changes as you change blocks.
_CNY is the category. Change it to _CNY2 for the second category.
Click "OK" and this should be it. Repeat for the other categories.
I have put an updated file on dropbox where you can see I already did it for the data of _FIN for categories CNY, CNY2 and INT and did the one for _GER as well. You'll notice the category of INT for _GER doesn't work, that's because the Named Range _GER_INT doesn't exist yet.