Ruby On Rails Classroom
prateek darmwal /
Professional /
Web Technology
- 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
The second syntax replaces the symbol/hashrocket combination with the name of the key followed by a colon and a value:
This construction more closely follows the hash notation in other languages (such as JavaScript) and enjoys growing popularity in the Rails community. Both syntaxes are still in common use, so it’s essential to be able to recognize them. Most hashes in the rest of this book use the new notation, which won’t work with Ruby 1.8.7 or earlier; if you are using an earlier version of Ruby, you will either have to upgrade to Ruby 1.9 (recommended) or use the old hash notation.
Hash values can be virtually anything, even other hashes, as seen in Listing 4.6
Listing 4.6 Nested hashes.
These sorts of hashes-of-hashes, or nested hashes, are heavily used by Rails, as we’ll see starting in Section 7.3.
As with arrays and ranges, hashes respond to the each method. For example, consider a hash named flash with keys for two conditions, :success and :error:
=> {:success=> "It worked!", :error=> "It failed."}
>> flash. each do |key, value|
?> puts "Key # {key.inspect} has value # {value.inspect}"
>> end
Key :success has value "It worked!"
Key :error has value "It failed."
Note that, while the each method for arrays takes a block with only one variable, each for hashes takes two, a key and a value. Thus, the each method for a hash iterates
through the hash one key-value pair at a time.
The last example uses the useful inspect method, which returns a string with a literal representation of the object it’s called on:
1
2
3
4
5
>> puts (1..5). to a.inspect # Put a literal array.
[1, 2, 3, 4, 5]
name
:name
>> puts "It worked!", "It worked!" .inspect
It worked!
"It worked!"
By the way, using inspect to print an object is common enough that there’s a shortcut for it, the p function:
:name
prateek darmwal
Skills Ruby On Rails
Qualifications :- High School - S.K.M. Sn. Sec. School, Haldwani, College/University - Graphic Era Hill University, Bhimtal,Location :-Dehradun,Dehradun,Uttarakhand,India
Description:- I like to explore new technologies. I have skills in ruby on rails, php5, cakephp, jquery, javascript, html/css, java, c & c++. I love coding
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