Tutorial by Examples: le

module OmniConcern extend ActiveSupport::Concern def create auth_params = request.env["omniauth.auth"] provider = AuthenticationProvider.get_provider_name(auth_params.try(:provider)).first authentication = provider.user_authentications.where(uid: auth_params.uid).first...

devise_for :users, controllers: {omniauth_callbacks: 'users/omniauth_callbacks'}

gem 'omniauth-oauth2' , '~> 1.3.1' gem 'omniauth' gem 'omniauth-facebook' gem 'omniauth-twitter' gem 'omniauth-gplus' gem 'omniauth-linkedin' Run the bundle install command, restart your server and off you go!

When one wishes to convert a list to a vector or data.frame object empty elements are typically dropped. This can be problematic which a list is created of a desired length are created with some empty values (e.g. a list with n elements is created to be added to an m x n matrix, data.frame, or data...

returnType (^blockName)(parameterType1, parameterType2, ...) = ^returnType(argument1, argument2, ...) {...}; float (^square)(float) = ^(float x) {return x*x;}; square(5); // resolves to 25 square(-7); // resolves to 49 Here's an example with no return and no parameters: NSMutableDicti...

For enabling Proguard configurations for your application you need to enable it in your module-level gradle file. You need to set the value of minifyEnabled to true. buildTypes { release { minifyEnabled true proguardFiles getDefaultProguardFile('proguard-android.t...

main.component.ts import {Component} from "@angular/core"; @Component({ selector: "main", template: ` <StackLayout> <TextField hint="some text"></TextField> <Button text="Click me" class="btn">...

Create a Dictionary<TKey, TValue> from an IEnumerable<T>: using System; using System.Collections.Generic; using System.Linq; public class Fruits { public int Id { get; set; } public string Name { get; set; } } var fruits = new[] { new Fruits { Id = 8 , Nam...

There are times when an include file has to generate different output from the preprocessor depending on whether the compiler is a C compiler or a C++ compiler due to language differences. For example a function or other external is defined in a C source file but is used in a C++ source file. Since...

com.google.gson library needs to be added to use this code. Here is the example string: String companyDetails = {"companyName":"abcd","address":"abcdefg"} JSON strings can be parsed using below syntax in Java: JsonParser parser = new JsonParser(); Json...

Remember to npm install all the files into devDependencies first. E.g. npm install --save-dev gulp gulp-concat gulp-rename gulp-uglify gulp-uglifycss Gulpfile.js var gulp = require('gulp'); var gulp_concat = require('gulp-concat'); var gulp_rename = require('gulp-rename'); var gulp_uglify = ...

To create a parallel collection from a sequential collection, call the par method. To create a sequential collection from a parallel collection, call the seq method. This example shows how you turn a regular Vector into a ParVector, and then back again: scala> val vect = (1 to 5).toVector vect:...

PyPar is a library that uses the message passing interface (MPI) to provide parallelism in Python. A simple example in PyPar (as seen at https://github.com/daleroberts/pypar) looks like this: import pypar as pp ncpus = pp.size() rank = pp.rank() node = pp.get_processor_name() print 'I am r...

When using async queries, you can execute multiple queries at the same time, but not on the same context. If the execution time of one query is 10s, the time for the bad example will be 20s, while the time for the good example will be 10s. Bad Example IEnumerable<TResult1> result1; IEnumera...

All lines must be terminated with a line feed character (LF, ASCII value 10) and not for instance CR or CR+LF. There may be no trailing white space at the end of a line. The name of a source file must equal the name of the class it contains followed by the .java extension, even for fil...

One variable per declaration (and at most one declaration per line) Square brackets of arrays should be at the type (String[] args) and not on the variable (String args[]). Declare a local variable right before it is first used, and initialize it as close to the declaration as possible.

Note the use of {{.}} to output the item within the template. package main import ( "fmt" "os" "text/template" ) func main() { const ( letter = `Dear {{.}}, How are you?` ) tmpl, err := template.New("letter").Pa...

Note the use of {{range .}} and {{end}} to cycle over the collection. package main import ( "fmt" "os" "text/template" ) func main() { const ( letter = `Dear {{range .}}{{.}}, {{end}} How are you?` ) tmpl, err := template...

It is possible to specify log destination with something that statisfies io.Writer interface. With that we can log to file: package main import ( "log" "os" ) func main() { logfile, err := os.OpenFile("test.log", os.O_RDWR|os.O_CREATE|os.O_APPEND,...

context.strokeStyle=color Sets the color that will be used to stroke the outline of the current path. These are color options (these must be quoted): A CSS named color, for example context.strokeStyle='red' A hex color, for example context.strokeStyle='#FF0000' An RGB color, for e...