Read "Streaming Systems" 1&2, Streaming 101 Read "F1, a distributed SQL database that scales" Read "Zanzibar, Google’s Consistent, Global Authorization System" Read "Spanner, Google's Globally-Distributed Database" Read "Designing Data-intensive applications" 12, The Future of Data Systems IOS development with Swift Read "Designing Data-intensive applications" 10&11, Batch and Stream Processing Read "Designing Data-intensive applications" 9, Consistency and Consensus Read "Designing Data-intensive applications" 8, Distributed System Troubles Read "Designing Data-intensive applications" 7, Transactions Read "Designing Data-intensive applications" 6, Partitioning Read "Designing Data-intensive applications" 5, Replication Read "Designing Data-intensive applications" 3&4, Storage, Retrieval, Encoding Read "Designing Data-intensive applications" 1&2, Foundation of Data Systems Three cases of binary search TAMU Operating System 2 Memory Management TAMU Operating System 1 Introduction Overview in cloud computing 2 TAMU Operating System 7 Virtualization TAMU Operating System 6 File System TAMU Operating System 5 I/O and Disk Management TAMU Operating System 4 Synchronization TAMU Operating System 3 Concurrency and Threading TAMU Computer Networks 5 Data Link Layer TAMU Computer Networks 4 Network Layer TAMU Computer Networks 3 Transport Layer TAMU Computer Networks 2 Application Layer TAMU Computer Networks 1 Introduction Overview in distributed systems and cloud computing 1 A well-optimized Union-Find implementation, in Java A heap implementation supporting deletion TAMU Advanced Algorithms 3, Maximum Bandwidth Path (Dijkstra, MST, Linear) TAMU Advanced Algorithms 2, B+ tree and Segment Intersection TAMU Advanced Algorithms 1, BST, 2-3 Tree and Heap TAMU AI, Searching problems Factorization Machine and Field-aware Factorization Machine for CTR prediction TAMU Neural Network 10 Information-Theoretic Models TAMU Neural Network 9 Principal Component Analysis TAMU Neural Network 8 Neurodynamics TAMU Neural Network 7 Self-Organizing Maps TAMU Neural Network 6 Deep Learning Overview TAMU Neural Network 5 Radial-Basis Function Networks TAMU Neural Network 4 Multi-Layer Perceptrons TAMU Neural Network 3 Single-Layer Perceptrons Princeton Algorithms P1W6 Hash Tables & Symbol Table Applications Stanford ML 11 Application Example Photo OCR Stanford ML 10 Large Scale Machine Learning Stanford ML 9 Anomaly Detection and Recommender Systems Stanford ML 8 Clustering & Principal Component Analysis Princeton Algorithms P1W5 Balanced Search Trees TAMU Neural Network 2 Learning Processes TAMU Neural Network 1 Introduction Stanford ML 7 Support Vector Machine Stanford ML 6 Evaluate Algorithms Princeton Algorithms P1W4 Priority Queues and Symbol Tables Stanford ML 5 Neural Networks Learning Princeton Algorithms P1W3 Mergesort and Quicksort Stanford ML 4 Neural Networks Basics Princeton Algorithms P1W2 Stack and Queue, Basic Sorts Stanford ML 3 Classification Problems Stanford ML 2 Multivariate Regression and Normal Equation Princeton Algorithms P1W1 Union and Find Stanford ML 1 Introduction and Parameter Learning

Use devise to authenticate your app

2016-05-15

Use Devise For Authentication

Devise is great gem for authentication, check out here.

Add Gem

First thing you need to do is to add devise gem to you Gemfile. Just add gem 'devise', '~> 3.5' to your Gemfile and run bundle install and restart your server.

Set Up

Run generator rails generate devise:install to install an initializer. Devise will generate lots of file, git status to checkout. Also there will be some guides for what to do next in the terminal, just do as indicated! Something like make sure there is homepage, rails g devise:views and configuration stuff.

Generate User

Say you want to generate a user model. Just run rails g devise User and rake db:migrate. Then you can go to users/sign_up to create a new account.

Devise It

Authenticate Users

Now you can authenticate users! Say you want that only users that have signed in can edit or delete posts, otherwise, they can only go for index and show pages. It’s pretty easy, just add this code to your posts_controller.rb file.

before_action: authenticate_user!, except: [:index, :show]

Then unauthenticated users will be redirected to sign up page if they want to edit or delete posts.

If you want the Edit and Delete button shown for users signed in. Add this code to your view.

<% if user_signed_in? %>
	<div id="admin_links">
		<%= link_to "Edit Article", edit_post_path(@post) %>
		<%= link_to "Delete Article", post_path(@post), method: :delete, data: {confirm: "Are you sure?"} %>
	</div>
<% end %>

You may also want add a sign out link for users who have signed in. To do this, add this code to your _header.html.erb partial.

<% if user_signed_in? %>
	<%= link_to "Sign Out", destroy_user_session_path, method: :delete %>
<% end %>

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