Concepts,,,,(සංකල්ප)

 Firbase hosting and functions provide nice solution to develop a REST api .The following video from firebase provide more infromation than our simple REST API. https://www.youtube.com/watch?v=LOeioOKUKI8 I thought of detail the process  in to more depth. First , you need to go to desired folder and install firebase tools. You should have npm for do that. Then create a firebase account and project with desired name. After that, you have to use the command firebase init. The online authentication will be proceed there after .You have to copy and paste the URL displayed in the console to the web browser. Then there we have to create the local project with firebase hosting and firebase functions. In the project you can see the functions folder ,which used to create the functions. In order to use the express, you need to use express npm packge. Move to functions folder and then run npm install express, then firebase-functions. If you are using firebase database , you

There are number of ways  firebase order by can be used.Ferfer the following example.  It can be user as a where clause  to select values based on child attribute.You dont need to select items within the for loop.  todoRef.orderByChild("title").equalTo("test 1").once('value').then(function(snapshot) {     snapshot.forEach(function(childSnapshot) {         var todoID=childSnapshot.key; }) }).. We can use it as fallow,,

I  need to take the users country based on the geo-codinates provided by the mobile application. whlile doing some reaserch in node which-country , I found that ituseful,but need to pass value wisely.  https://www.npmjs.com/package/which-country  var whichCountry = require('which-country'); // pass it as  [latitudes,logitudes] var userCountry = whichCountry([6.795019389999998,79.88569332999997]); console.log('test userCountry :'+userCountry);  //return null // pass it as [logitudes,latitudes] var userCountry = whichCountry([79.88569332999997,6.795019389999998]); console.log('test userCountry :'+userCountry);  //return LKA I test the application with the given code of me in the test packges given by them. https://github.com/vkurchatkin/which-country/blob/master/package.json AUS -22.000825,132.889122 BLR 52.337547,24.080529 CAN 57.255393,-106.712553 CYP 35.315045,33.681395 DZA 23.184085,7.117638 ITA 39.926747,9.017427 JPN 43.771243,142.764986

We normally use Stripe one day plan to test the scenarios. However we found a unexpected behavior  with stripe when we are using stripe one day plan. We created a subscription with the test card " 4000000000000341 " which make the payment unsuccessful when try to charge. According to dunning rules subscription have to cancel after 2 attempts. " It's likely that the Subscription hasn't cancelled because it doesn't have enough time to cancel as you have a daily Subscription. You see when a new invoice is created for a Subscription, it resets the retry logic (basically setting the retries back to zero).  For a daily Subscription you can't have more than 1 retry as it wouldn't give the retry logic enough time to carry out the final condition (i.e cancel the Subscription).  "

 This is a common error I found when I upgrade from node 8.8 to node 10.1 within my mac osx seirra. > node build.js || nodejs build.js xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance node 10.1 is not a stable release and I had to backdate it with the stable version. In addition, to fix the issue I had to run few commands to identify the location of command line tools. https://stackoverflow.com/questions/18533761/find-out-the-path-location-to-command-line-tools-for-xcode?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa /usr/ bin / clang -- version Apple LLVM version 9.0.0 (clang-900.0.39.2) Target: x86_64-apple-darwin16.7.0 Thread model: po

I have started using fire-base functions some time back and it was in beta release. When I try to update the functions within the production with the different node packages of firebase functions, following error occurred. TypeError: Cannot read property 'val' of undefined at exports.<>.functions.database.ref.onWrite.event (/user_code/index.js:467:38) at Object.<anonymous> (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:112:27) I have used number of  fire base functions  and all of them triggering based onWrite leads to the above error. After small search I found the following discussion , https://stackoverflow.com/questions/49746905/firebase-typeerror-cannot-read-property-val-of-undefined?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa I have moved  from     "firebase-functions": "^0.9.1", to  "firebase-functions": "^1.0.2", where there is a major cha

This is a common issue I have seen in Mac OSX when I try to use pip. eg:sudo pip install -t lib -r requirements.txt   Could not fetch URL https://pypi.python.org/simple/google-api-python-client/: There was a problem confirming the ssl certificate: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:590) - skipping However the reason for the problem is pip version update  with relevant to underlying OSX infrastructure. You have to identify which version of pip is there within mac OS.  Run brew install python    Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to `python3`, `python3-config`, `pip3` etc., respectively, have been installed into