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Ruby on Rails 3 Tutorial


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Table of Contents

Foreword by Derek Sivers xv

Foreword by Obie Fernandez xvii

Acknowledgments xix

About the Author xxi

Chapter 1: From Zero to Deploy 1

1.1 Introduction 3

1.2 Up and Running 9

1.3 Version Control with Git 24

1.4 Deploying 35

1.5 Conclusion 40

Chapter 2: A Demo App 41

2.1 Planning the Application 41

2.2 The Users Resource 44

2.3 The Microposts Resource 58

2.4 Conclusion 69

Chapter 3: Mostly Static Pages 71

3.1 Static Pages 74

3.2 Our First Tests 84

3.3 Slightly Dynamic Pages 103

3.4 Conclusion 115

3.5 Exercises 116

Chapter 4: Rails-Flavored Ruby 119

4.1 Motivation 119

4.2 Strings and Methods 125

4.3 Other Data Structures 134

4.4 Ruby Classes 144

4.5 Exercises 154

Chapter 5: Filling in the Layout 157

5.1 Adding Some Structure 157

5.2 Layout Links 177

5.3 User Signup: A First Step 186

5.4 Conclusion 191

5.5 Exercises 191

Chapter 6: Modeling and Viewing Users, Part I 193

6.1 User Model 194

6.2 User Validations 210

6.3 Viewing Users 227

6.4 Conclusion 236

6.5 Exercises 237

Chapter 7: Modeling and Viewing Users, Part II 239

7.1 Insecure Passwords 239

7.2 Secure Passwords 250

7.3 Better User Views 262

7.4 Conclusion 279

7.5 Exercises 280

Chapter 8 Sign Up 283

8.1 Signup Form 283

8.2 Signup Failure 292

8.3 Signup Success 305

8.4 RSpec Integration Tests 313

8.5 Conclusion 321

8.6 Exercises 321

Chapter 9: Sign In, Sign Out 325

9.1 Sessions 325

9.2 Signin Failure 332

9.3 Signin Success 338

9.4 Signing Out 354

9.5 Conclusion 363

9.6 Exercises 363

Chapter 10: Updating, Showing, and Deleting Users 365

10.1 Updating Users 365

10.2 Protecting Pages 376

10.3 Showing Users 384

10.4 Destroying Users 399

10.5 Conclusion 408

10.6 Exercises 409

Chapter 11: User Microposts 411

11.1 A Micropost Model 411

11.2 Showing Microposts 425

11.3 Manipulating Microposts 434

11.4 Conclusion 457

11.5 Exercises 458

Chapter 12: Following Users 461

12.1 The Relationship Model 463

12.2 A Web Interface for Following and Followers 482

12.3 The Status Feed 507

12.4 Conclusion 519

12.5 Exercises 523

Index 527

About the Author

Michael Hartl is a programmer, educator, and entrepreneur. He coauthored RailsSpace (Addison-Wesley, 2008), and was cofounder and lead developer of Insoshi, a popular social networking platform based on Rails. He previously taught theoretical and computational physics at the California Institute of Technology, earning the Caltech Lifetime Achievement Award for Excellence in Teaching. Michael is a graduate of Harvard College, holds a Ph.D. in physics from Caltech, and is an alumnus of the Y Combinator entrepreneur program. He maintains the Rails Tutorial website at

Reviews Michael Hartl's awesome new Rails Tutorial

The Ruby on Rails (TM)3 Tutorial: Learn Rails by Example by Michael Hartl has become a must read for developers learning how to build Rails apps.

-Peter Cooper, editor of Ruby Inside

Very detailed and hands-on Rails Tutorial!

Great job! I'm learning Rails, and found your tutorial to be one of the most detailed and hands-on guides. Besides many details of Rails, it also taught me about Git, Heroku, RSpec, Webrat, and most important (at least to me), it emphasized the Test-Driven Development (TDD) methodology. I learned a lot from your tutorial. Keep up the good job! Thanks so much for sharing it.

-Albert Liu, senior manager, Achievo Corporation.

Ruby on Rails Tutorial is the best!

Just wanted to say that your Ruby on Rails tutorial is the best! I've been trying for a while to wrap my head around Rails. Going through your tutorial, I'm finally feeling comfortable in the Rails environment. Your pedagogical style of gradually introducing more complex topics while at the same time giving the reader the instant gratification and a sense of accomplishment with working examples really works for me. I also like the tips and suggestions that give me a sense of learning from a real Rails insider. Your e-mail response to a problem I ran into is an example of your generous sharing of your experience.

-Ron Bingham, CEO, SounDBuytz

I love the writing style of the Rails Tutorial

I love the writing style of the Rails Tutorial, and there is so much content that is different from other Rails books out there, making it that much more valuable...Thanks for your work!

-Allen Ding

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