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Diffstat (limited to 'guides/source/getting_started.md')
| -rw-r--r-- | guides/source/getting_started.md | 61 |
1 files changed, 29 insertions, 32 deletions
diff --git a/guides/source/getting_started.md b/guides/source/getting_started.md index db4e81e32e..ef66b75ec1 100644 --- a/guides/source/getting_started.md +++ b/guides/source/getting_started.md @@ -23,9 +23,12 @@ application from scratch. It does not assume that you have any prior experience with Rails. However, to get the most out of it, you need to have some prerequisites installed: -* The [Ruby](https://www.ruby-lang.org/en/downloads) language version 1.9.3 or newer. -* The [RubyGems](https://rubygems.org) packaging system, which is installed with Ruby - versions 1.9 and later. To learn more about RubyGems, please read the [RubyGems Guides](http://guides.rubygems.org). +* The [Ruby](https://www.ruby-lang.org/en/downloads) language version 2.2.2 or newer. +* Right version of [Development Kit](http://rubyinstaller.org/downloads/), if you + are using Windows. +* The [RubyGems](https://rubygems.org) packaging system, which is installed with + Ruby by default. To learn more about RubyGems, please read the + [RubyGems Guides](http://guides.rubygems.org). * A working installation of the [SQLite3 Database](https://www.sqlite.org). Rails is a web application framework running on the Ruby programming language. @@ -34,7 +37,6 @@ curve diving straight into Rails. There are several curated lists of online reso for learning Ruby: * [Official Ruby Programming Language website](https://www.ruby-lang.org/en/documentation/) -* [reSRC's List of Free Programming Books](http://resrc.io/list/10/list-of-free-programming-books/#ruby) Be aware that some resources, while still excellent, cover versions of Ruby as old as 1.6, and commonly 1.8, and will not include some syntax that you will see in day-to-day @@ -50,7 +52,7 @@ code while accomplishing more than many other languages and frameworks. Experienced Rails developers also report that it makes web application development more fun. -Rails is opinionated software. It makes the assumption that there is the "best" +Rails is opinionated software. It makes the assumption that there is a "best" way to do things, and it's designed to encourage that way - and in some cases to discourage alternatives. If you learn "The Rails Way" you'll probably discover a tremendous increase in productivity. If you persist in bringing old habits from @@ -89,17 +91,17 @@ Open up a command line prompt. On Mac OS X open Terminal.app, on Windows choose dollar sign `$` should be run in the command line. Verify that you have a current version of Ruby installed: +```bash +$ ruby -v +ruby 2.2.2p95 +``` + TIP: A number of tools exist to help you quickly install Ruby and Ruby on Rails on your system. Windows users can use [Rails Installer](http://railsinstaller.org), while Mac OS X users can use [Tokaido](https://github.com/tokaido/tokaidoapp). For more installation methods for most Operating Systems take a look at [ruby-lang.org](https://www.ruby-lang.org/en/documentation/installation/). -```bash -$ ruby -v -ruby 2.0.0p353 -``` - Many popular UNIX-like OSes ship with an acceptable version of SQLite3. On Windows, if you installed Rails through Rails Installer, you already have SQLite installed. Others can find installation instructions @@ -163,7 +165,7 @@ of the files and folders that Rails created by default: | File/Folder | Purpose | | ----------- | ------- | |app/|Contains the controllers, models, views, helpers, mailers and assets for your application. You'll focus on this folder for the remainder of this guide.| -|bin/|Contains the rails script that starts your app and can contain other scripts you use to setup, deploy or run your application.| +|bin/|Contains the rails script that starts your app and can contain other scripts you use to setup, update, deploy or run your application.| |config/|Configure your application's routes, database, and more. This is covered in more detail in [Configuring Rails Applications](configuring.html).| |config.ru|Rack configuration for Rack based servers used to start the application.| |db/|Contains your current database schema, as well as the database migrations.| @@ -298,6 +300,7 @@ Rails.application.routes.draw do # The priority is based upon order of creation: # first created -> highest priority. + # See how all your routes lay out with "rake routes". # # You can have the root of your site routed with "root" # root 'welcome#index' @@ -377,7 +380,7 @@ edit_article GET /articles/:id/edit(.:format) articles#edit In the next section, you will add the ability to create new articles in your application and be able to view them. This is the "C" and the "R" from CRUD: -creation and reading. The form for doing this will look like this: +create and read. The form for doing this will look like this:  @@ -400,7 +403,7 @@ a controller called `ArticlesController`. You can do this by running this command: ```bash -$ bin/rails g controller articles +$ bin/rails generate controller articles ``` If you open up the newly generated `app/controllers/articles_controller.rb` @@ -619,7 +622,7 @@ def create end ``` -The `render` method here is taking a very simple hash with a key of `plain` and +The `render` method here is taking a very simple hash with a key of `:plain` and value of `params[:article].inspect`. The `params` method is the object which represents the parameters (or fields) coming in from the form. The `params` method returns an `ActiveSupport::HashWithIndifferentAccess` object, which @@ -836,7 +839,7 @@ class ArticlesController < ApplicationController def new end - # snipped for brevity + # snippet for brevity ``` A couple of things to note. We use `Article.find` to find the article we're @@ -892,7 +895,7 @@ class ArticlesController < ApplicationController def new end - # snipped for brevity + # snippet for brevity ``` And then finally, add the view for this action, located at @@ -1240,10 +1243,9 @@ article we want to show the form back to the user. We reuse the `article_params` method that we defined earlier for the create action. -TIP: You don't need to pass all attributes to `update`. For -example, if you'd call `@article.update(title: 'A new title')` -Rails would only update the `title` attribute, leaving all other -attributes untouched. +TIP: It is not necessary to pass all the attributes to `update`. For example, +if `@article.update(title: 'A new title')` was called, Rails would only update +the `title` attribute, leaving all other attributes untouched. Finally, we want to show a link to the `edit` action in the list of all the articles, so let's add that now to `app/views/articles/index.html.erb` to make @@ -1491,7 +1493,7 @@ appear.  TIP: Learn more about jQuery Unobtrusive Adapter (jQuery UJS) on -[Working With Javascript in Rails](working_with_javascript_in_rails.html) guide. +[Working With JavaScript in Rails](working_with_javascript_in_rails.html) guide. Congratulations, you can now create, show, list, update and destroy articles. @@ -1546,20 +1548,17 @@ class CreateComments < ActiveRecord::Migration create_table :comments do |t| t.string :commenter t.text :body - - # this line adds an integer column called `article_id`. - t.references :article, index: true + t.references :article, index: true, foreign_key: true t.timestamps null: false end - add_foreign_key :comments, :articles end end ``` -The `t.references` line sets up a foreign key column for the association between -the two models. An index for this association is also created on this column. -Go ahead and run the migration: +The `t.references` line creates an integer column called `article_id`, an index +for it, and a foreign key constraint that points to the `id` column of the `articles` +table. Go ahead and run the migration: ```bash $ bin/rake db:migrate @@ -1572,8 +1571,6 @@ run against the current database, so in this case you will just see: == CreateComments: migrating ================================================= -- create_table(:comments) -> 0.0115s --- add_foreign_key(:comments, :articles) - -> 0.0000s == CreateComments: migrated (0.0119s) ======================================== ``` @@ -2003,7 +2000,7 @@ class ArticlesController < ApplicationController @articles = Article.all end - # snipped for brevity + # snippet for brevity ``` We also want to allow only authenticated users to delete comments, so in the @@ -2019,7 +2016,7 @@ class CommentsController < ApplicationController # ... end - # snipped for brevity + # snippet for brevity ``` Now if you try to create a new article, you will be greeted with a basic HTTP |