Tutorial by Examples: e

:g/Hello/d Will delete every line containing the text "Hello". Important note: This is not the normal mode command d, this is the ex command :d. You can use the global command to apply normal mode keystrokes instead of ex commands by prepending normal or norm to the command. For exampl...

Modify your Gemfile to include the Devise gem: gem 'devise' Then update your gems with: $ bundle install Run the installers in your project: $ rails generate devise:install Then create your Devise model (e.g. User) with: $ rails generate devise User you'll need to set up the default ...

class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController include OmniConcern %w[facebook twitter gplus linkedin].each do |meth| define_method(meth) do create end end end Note: In the part “%w[facebook twitter gplus linkedin]”, you should list ...

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...

class CreateAuthenticationProviders < ActiveRecord::Migration def change create_table "authentication_providers", :force => true do |t| t.string "name" t.datetime "created_at", :null => false ...

class CreateUserAuthentications < ActiveRecord::Migration def change create_table "user_authentications", :force => true do |t| t.integer "user_id" t.integer "authentication_provider_id" t.string "uid&q...

has_many :users has_many :user_authentications

belongs_to :user belongs_to :authentication_provider serialize :params def self.create_from_omniauth(params, user, provider) token_expires_at = params['credentials']['expires_at'] ? Time.at(params['credentials']['expires_at']).to_datetime : nil create( user: user, ...

include OmniauthAttributesConcern has_many :user_authentications devise :omniauthable, :database_authenticatable, :registerable,:recoverable, :rememberable, :trackable def self.create_from_omniauth(params) self.send(params.provider,params) end

module OmniauthAttributesConcern extend ActiveSupport::Concern module ClassMethods Add Methods here end end In this concern we can create methods for each social media to fetch and store attributes. def twitter params (params['info']['email'] = "dummy#{SecureRan...

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

For Facebook config.omniauth :facebook, facebook_app_id, facebook_secret_key, :display => "popup", :scope => 'email,publish_actions', info_fields: 'email,name' For Twitter config.omniauth :twitter, twitter_app_id, twitter_secret_key, :display => "popup", :scope =&gt...

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!

Moving away from a buffer with unsaved changes will cause this error: E37: No write since last change (add ! to override) You can disable this by adding set hidden to your .vimrc file. With this option set your changes will persist in the buffer, but will not be saved to disk.

The System.Web.SessionState.HttpSessionState object provides a way to persist values between HTTP requests. In the example below, a user's preference for warnings is being saved in the session. Later on, while serving another request to the user, the application can read this preference from session...

If you find that you have multiple servers that need to share session state, storing it in the ASP.NET process memory will not work. For example you may deploy into a web-farm environment with a load balancer that distributes requests in a round-robin fashion. In this environment a single user's req...

If you don't want to use SQL server you can use Amazon's hosted Dynamo DB nosql database as a session store. You'll need the AWS SDK. To install this from the Visual Studio nuget package manager console use the following command Install-Package AWSSDK You can then configure your sessionState p...

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...

appointment = Appointment.find(5) appointment.lock! #no other users can read this appointment, #they have to wait until the lock is released appointment.save! #lock is released, other users can read this account

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...