Tutorial by Examples: d

Forms can be defined, in a similar manner to models, by subclassing django.forms.Form. Various field input options are available such as CharField, URLField, IntegerField, etc. Defining a simple contact form can be seen below: from django import forms class ContactForm(forms.Form): contac...

use std::fs::File; use std::io::Read; fn main() { let filename = "src/main.rs"; // Open the file in read-only mode. match File::open(filename) { // The file is open (no error). Ok(mut file) => { let mut content = String::new(); ...

use std::fs::File; use std::io::{BufRead, BufReader}; fn main() { let filename = "src/main.rs"; // Open the file in read-only mode (ignoring errors). let file = File::open(filename).unwrap(); let reader = BufReader::new(file); // Read the file line by line us...

Channels can be used to send data from one thread to another. Below is an example of a simple producer-consumer system, where the main thread produces the values 0, 1, ..., 9, and the spawned thread prints them: use std::thread; use std::sync::mpsc::channel; fn main() { // Create a channel...

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return Socialite::driver('facebook')->redirect(); This will redirect an incoming request to the appropriate URL to be authenticated. A basic example would be in a controller <?php namespace App\Http\Controllers\Auth; use Socialite; class AuthenticationController extends Controller...

/** * LoginController constructor. * @param Socialite $socialite */ public function __construct(Socialite $socialite) { $this->socialite = $socialite; } Within the constructor of your Controller, you're now able to inject the Socialite class that will help you handle login with so...

Usually we want to separate the creation of the dialog from its appearance. Then three steps are needed. Create base element <div id="dialog" title="Basic dialog"> <p>This is the default dialog which is useful for displaying information. The dialog window can...

Model creation Model classes must extend Illuminate\Database\Eloquent\Model. The default location for models is the /app directory. A model class can be easily generated by the Artisan command: php artisan make:model [ModelName] This will create a new PHP file in app/ by default, which is name...

EXPOSE <port> [<port>...] From Docker's documentation: The EXPOSE instruction informs Docker that the container listens on the specified network ports at runtime. EXPOSE does not make the ports of the container accessible to the host. To do that, you must use either the -p flag to ...

Avoid destructive operations on quoted objects. Quoted objects are literal objects. They are possibly embedded in the code in some way. How this works and the effects of modifications are unspecified in the Common Lisp standard, but it can have unwanted consequences like modifying shared data, tryin...

docker exec -it <container id> /bin/bash It is common to log in an already running container to make some quick tests or see what the application is doing. Often it denotes bad container use practices due to logs and changed files should be placed in volumes. This example allows us log in the...

9.0 // Since the anchor system simply returns constraints, you still need to add them somewhere. View.AddConstraints( new[] { someLabel.TopAnchor.ConstraintEqualTo(TopLayoutGuide.GetBottomAnchor()), anotherLabel.TopAnchor.ConstraintEqualTo(someLabel.BottomAnchor, 6), ...

// Using Visual Format Language requires a special look-up dictionary of names<->views. var views = new NSDictionary( nameof(someLabel), someLabel, nameof(anotherLabel), anotherLabel, nameof(oneMoreLabel), oneMoreLabel ); // It can also take a look-up dictionary for metrics (...

It is possible to mount a host directory to a specific path in your container using the -v or --volume command line option. The following example will mount /etc on the host to /mnt/etc in the container: (on linux) docker run -v "/etc:/mnt/etc" alpine cat /mnt/etc/passwd (on windows) do...

Before Python 3.5+ was released, the asyncio module used generators to mimic asynchronous calls and thus had a different syntax than the current Python 3.5 release. Python 3.x3.5 Python 3.5 introduced the async and await keywords. Note the lack of parentheses around the await func() call. import ...

First, remove autopublish. autopublish automatically publishes the entire database to the client-side, and so the effects of publications and subscriptions cannot be seen. To remove autopublish: $ meteor remove autopublish Then you can create publications. Below is a full example. import { Mon...

A named publication is one that possesses a name and needs to be explicitly subscribed to from the client. Consider this server side code: Meteor.publish('somePublication', function() { return SomeCollection.find() }) The client needs to request it by: Meteor.subscribe('somePublication') ...

Meteor's default templating system Spacebars and its underlying rendering subsystem Blaze integrate seemlessly with publication lifecycle methods such that a simple piece of template code can subscribe to its own data, stop and clean up its own traces during the template tear down. In order to tap ...

Example Application-extending class for handling the reporting: @ReportsCrashes( formUri = "https://backend-of-your-choice.com/",//Non-password protected. customReportContent = { /* */ReportField.APP_VERSION_NAME, ReportField.PACKAGE_NAME,ReportField.ANDROID_VERSION, R...