- Foreword to the First Edition
- Acknowledgments
- About the Author
- From Zero to Deploy
- Development Environments
- Ruby RubyGems Rails and Git
- The First Application
- rails server
- Model-view-controller MVC
- Version Control with Git
- What Good Does Git Do You
- GitHub
- Branch Edit Commit Merge
- Deploying
- Heroku Setup
- Conclusion
- A Demo App
- Planning the Application
- Modeling Demo Users
- Modeling Demo Microposts
- The Users Resource
- A User Tour
- MVC in Action
- Weaknesses of this Users Resource
- The Microposts Resource
- A Micropost Microtour
- Putting the micro in Microposts
- A User has many Microposts
- Inheritance Hierarchies
- Deploying the Demo App
- Conclusion
- Static Page
- Mostly Static Pages
- Truly Static Pages
- Static Pages with Rails
- Our First Tests
- Test-driven Development
- Adding a Page
- Testing a Title Change
- Passing Title Tests
- Embedded Ruby
- Eliminating Duplication with Layouts
- Conclusion
- Advanced Setup
- Eliminating bundle exec
- Automated Tests with Guard
- Speeding up Tests with Spork
- Tests inside Sublime Text
- Rails-Flavored Ruby
- Strings and Methods
- Objects and Message Passing
- Method Definitions
- Other Data Structures
- Blocks
- Hashes and Symbols
- CSS revisited
- Ruby Classes-Constructors
- Class Inheritance
- Modifying Built-in Classes -A Controller Class
- A User Class
- Conclusion-Exercises
- Adding Some Structure
- Site Navigation
- Bootstrap and Custom CSS
- Partials
- Sass and the Asset Pipeline
- Syntactically Awesome Stylesheets
- Layout Links
- Route Tests
- Rails Routes
- Named Routes
- Pretty RSpec
- User Signup A First Step
- Signup URI
- Conclusion-Exercises
- Modeling Users
- User Model
- Database Migrations
- The Model File
- Creating User Objects
- Finding User Objects
- Updating User Objects
- User Validations
- Validating Presence
- Length Validation-Format Validation
- Uniqueness Validation
- Adding a Secure Password
- An Encrypted Password
- Password and Confirmation
- User Authentication
- User Has Secure Password
- Creating a User
- Conclusion-Exercises
- Showing Users
- Debug and Rails Environments
- A Users Resource
- Testing the User Show Page with Factories
- A Gravatar Image and a Sidebar
- Signup Form
- Tests for User Signup
- Using form for
- The Form HTML
- Signup Failure
- Signup Error Messages
- The Finished Signup Form
- The Flash
- Deploying to Production with SSL
- Conclusion-Exercises
- Sessions and Signin Failure
- Sessions Controller
- Signin Tests
- Signin Form
- Reviewing Form Submission
- Rendering with a Flash Message
- Signin Success
- Remember Me
- A Working sign in Method
- Current User
- Changing the Layout Links
- Signin upon Signup
- Signing Out
- Introduction to Cucumber Optional
- Installation and Setup
- Features and Steps
- Counterpoint RSpec Custom Matchers
- Conclusion-Exercises
- Updating Users
- Edit Form
- Unsuccessful Edits
- Successful Edits
- Authorization
- Requiring Signed-in Users
- Requiring the Right User
- Friendly Forwarding
- Showing All Users
- User Index
- Sample Users
- Pagination
- Partial Refactoring
- Deleting Users-Administrative Users
- The destroy Action
- Conclusion-Exercises
- A Micropost Model
- The Basic Model
- Accessible Attributes and the First Validation
- User Micropost Associations
- Micropost Refinements
- Content Validations
- Showing Microposts
- Augmenting the User Show Page
- Sample Microposts
- Manipulating Microposts
- Access Control
- Creating Microposts
- A Proto-feed
- Destroying Microposts
- Conclusion-Exercises
- Following Users
- The Relationship Model
- A Problem with the Data Model and a Solution
- User Relationship Associations
- Validations
- Followed users
- Followers
- Sample Following Data
- Stats and a Follow Form
- Following and Followers Pages
- A Working Follow Button the Standard Way
- A Working Follow Button with Ajax
- Making the output of find readable in shell
- CRUD Operation-Create
- The Status Feed
- Motivation and Strategy
- A First Feed Implementation
- Subselects
- The New Status Feed
- Conclusion
- Exercises
Ruby On Rails Lesson
A Controller Class
All this talk about classes and inheritance may have triggered a flash of recognition, because we have seen both before, in the StaticPages controller (Listing 3.15):
def home
end
def help
end
def about
end
end
You’re now in a position to appreciate, at least vaguely, what this code means: StaticPagesController is a class that inherits from ApplicationController and comes equipped with home, help, and about methods. Since each Rails console session loads the local Rails environment, we can even create a controller explicitly and examine its class hierarchy:13
=> #<Static Pages Controller: 0x22855d0>
>> controller. class
=> Static Pages Controller
>> controller .class .superclass
=> ApplicationController
=> ActionController ::Base
>> controller. class .superclass .superclass .superclass
=> ActionController :: Metal
>> controller .class .superclass .superclass .superclass .superclass
=> AbstractController :: Base
>> controller .class .superclass .superclass .superclass .superclass .superclass
=> Object
A diagram of this hierarchy appears in Figure 4.3
Figure 4.3 The inheritance hierarchy for the StaticPages controller.
We can even call the controller actions inside the console, which are just methods:
=> nil
Here the return value is nil because the home action is blank.
But wait—actions don’t have return values, at least not ones that matter. The point of the home action, as we saw in Chapter 3, is to render a web page, not toreturn a value. And I sure don’t remember ever calling StaticPagesController.new anywhere. What’s going on?
What’s going on is that Rails is written in Ruby, but Rails isn’t Ruby. Some Rails classes are used like ordinary Ruby objects, but some are just grist for Rails’ magic mill. Rails is sui generis and should be studied and understood separately from Ruby. This is why, if your principal programming interest is writing web applications, I recommend learning Rails first, then learning Ruby, then looping back to Rails.
Pooja Negi
Skills Ruby On Rails
Qualifications :- High School - SSN high school, College/University - HNBGU, College/University - SRHU,Location :-Ranipokhari,Rishikesh,Uttarakhand,India
Description:- Student
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