May 2019 – Page 2

Firebase Admin Multi App Initialization

May 28, 2019

require('firebase');
var admin = require('firebase-admin');
var firstServiceAccount = require('path/to/service-account-1');
var secondServiceAccount = require('path/to/service-account-2');

var _first = admin.initializeApp(
  {
    credential: admin.credential.cert(firstServiceAccount),
    databaseURL: 'https://<1st-db-name>.firebaseio.com'
  }, 
  'first' // this name will be used to retrieve firebase instance. E.g. first.database();
);

var _second = admin.initializeApp(
  {
    credential: admin.credential.cert(secondServiceAccount),
    databaseURL: 'https://<2nd-db-name>.firebaseio.com'
  }, 
  'second' // this name will be used to retrieve firebase instance. E.g. second.database();
);

exports.first = _first;
exports.second = _second;

Usage

var first = require('../path/to/the/file/above');
var second = require('../path/to/the/file/above');
 
first.database();
second.database();

References
https://gist.github.com/jofftiquez/1317de9ce97ab72b8295013a3f2ccff0
https://gist.github.com/jofftiquez/6d4bb432c7b25fe9a89e8f5231ea8ce2

How to update PM2

May 27, 2019

pm2 save
npm install pm2 -g
pm2 update

References
http://pm2.keymetrics.io/docs/usage/update-pm2/

Change the application ID for build variants and product flavor

May 27, 2019

android {
    defaultConfig {
        applicationId "com.example.myapp"
    }
    productFlavors {
        free {
            applicationIdSuffix ".free"
        }
        pro {
            applicationIdSuffix ".pro"
        }
    }
}

android { 
    ...
    flavorDimensions "default"
    ...
}

It is better to use different AndroidManifest.xml and google-services.json file for each flavor

References
https://developer.android.com/studio/build/application-id
https://developers.google.com/android/guides/google-services-plugin
https://stackoverflow.com/questions/44105127/android-studio-3-0-flavor-dimension-issue
https://android.jlelse.eu/how-to-use-different-google-services-json-file-with-multiple-product-flavors-android-7853d98dd6c0
https://stackoverflow.com/questions/34990479/no-matching-client-found-for-package-name-google-analytics-multiple-productf
https://medium.com/@Miqubel/multiple-build-types-in-firebase-on-android-6f6715f6dd83
https://www.zidsworld.com/android-tutorials/here-is-how-to-fix-no-matching-client-found-for-package-name-on-android/

Declare a variable in Gradle usable in Java using buildConfigField and resValue

May 27, 2019

Generate Java Constants

android {
    buildTypes {
        debug {
            buildConfigField "int", "FOO", "42"
            buildConfigField "String", "FOO_STRING", "\"foo\""
            buildConfigField "boolean", "LOG", "true"
        }

        release {
            buildConfigField "int", "FOO", "52"
            buildConfigField "String", "FOO_STRING", "\"bar\""
            buildConfigField "boolean", "LOG", "false"
        }
    }
}

You can access them with BuildConfig.FOO

Generate Android resources

android {
    buildTypes {
        debug{
            resValue "string", "app_name", "My App Name Debug"
        }
        release {
            resValue "string", "app_name", "My App Name"
        }
    }
}

You can access them in the usual way with @string/app_name or R.string.app_name

String type build config fields should be declared like this:

buildConfigField "String", "SERVER_URL", "\"http://dev.myserver.com\""

References
https://stackoverflow.com/questions/17197636/is-it-possible-to-declare-a-variable-in-gradle-usable-in-java
https://stackoverflow.com/questions/30796533/how-to-generate-buildconfigfield-with-string-type

Kill process running under certain port on Linux

May 27, 2019

sudo kill -9 $(sudo lsof -t -i:8000)

References
https://www.davidokwii.com/kill-process-running-under-certain-port/
https://unix.stackexchange.com/questions/106561/finding-the-pid-of-the-process-using-a-specific-port

Reordering with Bootstrap Grid System

May 25, 2019

Use .order- classes for controlling the visual order of your content. These classes are responsive, so you can set the order by breakpoint (e.g., .order-1.order-md-2). Includes support for 1 through 12 across all five grid tiers.

<div class="container">
  <div class="row">
    <div class="col">
      First, but unordered
    </div>
    <div class="col order-12">
      Second, but last
    </div>
    <div class="col order-1">
      Third, but first
    </div>
  </div>
</div>

There are also responsive .order-first and .order-last classes that change the order of an element by applying order: -1 and order: 13 (order: $columns + 1), respectively. These classes can also be intermixed with the numbered .order-* classes as needed.

<div class="container">
  <div class="row">
    <div class="col order-last">
      First, but last
    </div>
    <div class="col">
      Second, but unordered
    </div>
    <div class="col order-first">
      Third, but first
    </div>
  </div>
</div>

References
https://getbootstrap.com/docs/4.3/layout/grid/#reordering

Column breaks with Bootstrap Grid System

May 25, 2019

Breaking columns to a new line in flexbox requires a small hack: add an element with width: 100% wherever you want to wrap your columns to a new line. Normally this is accomplished with multiple .rows, but not every implementation method can account for this.

<div class="container">
  <div class="row">
    <div class="col-6 col-sm-3">.col-6 .col-sm-3</div>
    <div class="col-6 col-sm-3">.col-6 .col-sm-3</div>

    <!-- Force next columns to break to new line -->
    <div class="w-100"></div>

    <div class="col-6 col-sm-3">.col-6 .col-sm-3</div>
    <div class="col-6 col-sm-3">.col-6 .col-sm-3</div>
  </div>
</div>

<div class="container">
  <div class="row">
    <div class="col-6 col-sm-4">.col-6 .col-sm-4</div>
    <div class="col-6 col-sm-4">.col-6 .col-sm-4</div>

    <!-- Force next columns to break to new line at md breakpoint and up -->
    <div class="w-100 d-none d-md-block"></div>

    <div class="col-6 col-sm-4">.col-6 .col-sm-4</div>
    <div class="col-6 col-sm-4">.col-6 .col-sm-4</div>
  </div>
</div>

References
https://getbootstrap.com/docs/4.3/layout/grid/#column-breaks

Column wrapping with Bootstrap Grid System

May 25, 2019

If more than 12 columns are placed within a single row, each group of extra columns will, as one unit, wrap onto a new line.

<div class="container">
  <div class="row">
    <div class="col-9">.col-9</div>
    <div class="col-4">.col-4<br>Since 9 + 4 = 13 &gt; 12, this 4-column-wide div gets wrapped onto a new line as one contiguous unit.</div>
    <div class="col-6">.col-6<br>Subsequent columns continue along the new line.</div>
  </div>
</div>

References
https://getbootstrap.com/docs/4.3/layout/grid/#column-wrapping

No gutters between columns in Bootstrap Grid System

May 25, 2019

The gutters between columns in our predefined grid classes can be removed with .no-gutters. This removes the negative margins from .row and the horizontal padding from all immediate children columns.

<div class="row no-gutters">
  <div class="col-12 col-sm-6 col-md-8">.col-12 .col-sm-6 .col-md-8</div>
  <div class="col-6 col-md-4">.col-6 .col-md-4</div>
</div>

References
https://getbootstrap.com/docs/4.3/layout/grid/#no-gutters

Horizontal alignment with Bootstrap Grid System

May 25, 2019

<div class="container">
  <div class="row justify-content-start">
    <div class="col-4">
      One of two columns
    </div>
    <div class="col-4">
      One of two columns
    </div>
  </div>
  <div class="row justify-content-center">
    <div class="col-4">
      One of two columns
    </div>
    <div class="col-4">
      One of two columns
    </div>
  </div>
  <div class="row justify-content-end">
    <div class="col-4">
      One of two columns
    </div>
    <div class="col-4">
      One of two columns
    </div>
  </div>
  <div class="row justify-content-around">
    <div class="col-4">
      One of two columns
    </div>
    <div class="col-4">
      One of two columns
    </div>
  </div>
  <div class="row justify-content-between">
    <div class="col-4">
      One of two columns
    </div>
    <div class="col-4">
      One of two columns
    </div>
  </div>
</div>

References
https://getbootstrap.com/docs/4.3/layout/grid/#horizontal-alignment