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You would need to install ruby before you can install rails. Mac already comes with ruby installed based on how recent your macOS is? Depending on what ruby version you want for your development, the best way to install Ruby is to use RVM. In your terminal, type the command below listed in step...

<?php function wpshout_register_widgets() { register_widget( 'Favorite_Song_Widget'); } add_action( 'widgets_init', 'wpshout_register_widgets' ); class Favorite_Song_Widget extends WP_Widget { function Favorite_Song_Widget() { // Instantiate the parent object parent:...

This example has been taken from here package com.reborne.SmartHibernateConnector.utils; import org.hibernate.HibernateException; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; public class LiveHibernateConnector implements IHiber...

The easiest way of installing Vala is to install your distribution-specific package. On Ubuntu: sudo apt install valac On Fedora: sudo dnf install vala On Arch: sudo pacman -S vala On OS X, with Homebrew: brew install vala On Windows, you can get an installer for the latest version ...

This is a variation on the generic example. You just need to import your app script and invoke it's run() method in the service's main() function. In this case we're also using the multiprocessing module due to an issue accessing WSGIRequestHandler. import win32serviceutil import win32service imp...

A function in a normal module (but not a Class module) can return an array by putting () after the data type. Function arrayOfPiDigits() As Long() Dim outputArray(0 To 2) As Long outputArray(0) = 3 outputArray(1) = 1 outputArray(2) = 4 arrayOfPiDigits = outputArray ...

fuzzy translations Sometimes makemessages may think that the string it found for translation is somewhat similar to already existing translation. It will when mark it in the .po file with a special fuzzy comment like this: #: templates/randa/map.html:91 #, fuzzy msgid "Country" msgstr...

Cassandra uses two kinds of keys: the Partition Keys is responsible for data distribution across nodes the Clustering Key is responsible for data sorting within a partition A primary key is a combination of those to types. The vocabulary depends on the combination: simple primary key: only...

First you disable your network card's automatic checksumming: sudo ethtool -K eth1 tx off Then send your packet, using a SOCK_RAW socket: #!/usr/bin/env python from socket import socket, AF_PACKET, SOCK_RAW s = socket(AF_PACKET, SOCK_RAW) s.bind(("eth1", 0)) # We're putting toge...

Returns the value of any OS environment variable. MESSAGE OS-GETENV ("OS") VIEW-AS ALERT-BOX. On a Windows machine: MESSAGE OS-GETENV ("SHELL") VIEW-AS ALERT-BOX. Result on a Linux machine with Bash as current shell: ┌────── Message ───────┐ ...

Returns a list of all drives on a system. MESSAGE OS-DRIVES VIEW-AS ALERT-BOX. Result with four drives, C through F: On Linux the list will simply be empty as there by definitions are no "drives" connected. Listing directories is done in another way (INPUT FROM OS-DIR)

You monitor the cached objects to see how often they expire and if they are "nuked". n_expired - Number of expired objects. n_lru_nuked - Last recently used nuked objects. Number of objects nuked (removed) from the cache because of lack of space. varnishstat -1 | grep "n_expire...

You need to keep track of some threads metrics to watch your Varnish Cache. Is it running out of OS resources or is it functioning well. threads - Number of threads in all pools. threads_created - Number of created threads. threads_failed - Number of times Varnish failed to create a thread. th...

There are a number of metrics describing the communication between Varnish and it's backends. The most important metrics here might be these: backend_busy - Number of http 5xx statuses recieved by a backend. With VCL you can configure Varnish to try another backend if this happens. backend_fail...

{-# LANGUAGE OverloadedStrings #-} module Main where import Data.Aeson main :: IO () main = do let example = Data.Aeson.object [ "key" .= (5 :: Integer), "somethingElse" .= (2 :: Integer) ] :: Value print . encode $ example

<?php $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, "https://api.dropboxapi.com/2/files/list_folder"); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_CAINFO, "cacert.pem"); curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0); curl_setopt($ch, CURLOP...

As edgeapi suggests, it provides an interface for protecting attributes from end-user assignment. This makes Action Controller parameters forbidden to be used in Active Model mass assignment until they have been whitelisted. In addition, parameters can be marked as required and flow through a prede...

import javax.inject.Singleton; import dagger.Module; import dagger.Provides; @Module public class VehicleModule { @Provides @Singleton Motor provideMotor(){ return new Motor(); } @Provides @Singleton Vehicle provideVehicle(){ return new Vehicle(...

The connection between the provider of dependencies, @Module, and the classes requesting them through @Inject is made using @Component, which is an interface: import javax.inject.Singleton; import dagger.Component; @Singleton @Component(modules = {VehicleModule.class}) public interface Vehicl...

Now that you have every connection ready, you have to obtain an instance of this interface and invoke its methods to obtain the object you need: VehicleComponent component = Dagger_VehicleComponent.builder().vehicleModule(new VehicleModule()).build(); vehicle = component.provideVehicle(); Toast.m...