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Diffstat (limited to 'guides/source/getting_started.md')
| -rw-r--r-- | guides/source/getting_started.md | 42 |
1 files changed, 22 insertions, 20 deletions
diff --git a/guides/source/getting_started.md b/guides/source/getting_started.md index dc63ae62b1..a5e35f75a0 100644 --- a/guides/source/getting_started.md +++ b/guides/source/getting_started.md @@ -422,12 +422,12 @@ If you refresh <http://localhost:3000/articles/new> now, you'll get a new error: This error indicates that Rails cannot find the `new` action inside the `ArticlesController` that you just generated. This is because when controllers are generated in Rails they are empty by default, unless you tell it -your wanted actions during the generation process. +your desired actions during the generation process. To manually define an action inside a controller, all you need to do is to define a new method inside the controller. Open `app/controllers/articles_controller.rb` and inside the `ArticlesController` -class, define a `new` method so that the controller now looks like this: +class, define the `new` method so that your controller now looks like this: ```ruby class ArticlesController < ApplicationController @@ -444,23 +444,23 @@ With the `new` method defined in `ArticlesController`, if you refresh You're getting this error now because Rails expects plain actions like this one to have views associated with them to display their information. With no view -available, Rails errors out. +available, Rails will raise an exception. In the above image, the bottom line has been truncated. Let's see what the full -thing looks like: +error message looks like: >Missing template articles/new, application/new with {locale:[:en], formats:[:html], handlers:[:erb, :builder, :coffee]}. Searched in: * "/path/to/blog/app/views" That's quite a lot of text! Let's quickly go through and understand what each -part of it does. +part of it means. -The first part identifies what template is missing. In this case, it's the +The first part identifies which template is missing. In this case, it's the `articles/new` template. Rails will first look for this template. If not found, then it will attempt to load a template called `application/new`. It looks for one here because the `ArticlesController` inherits from `ApplicationController`. The next part of the message contains a hash. The `:locale` key in this hash -simply indicates what spoken language template should be retrieved. By default, +simply indicates which spoken language template should be retrieved. By default, this is the English - or "en" - template. The next key, `:formats` specifies the format of template to be served in response. The default format is `:html`, and so Rails is looking for an HTML template. The final key, `:handlers`, is telling @@ -473,14 +473,16 @@ Templates within a basic Rails application like this are kept in a single location, but in more complex applications it could be many different paths. The simplest template that would work in this case would be one located at -`app/views/articles/new.html.erb`. The extension of this file name is key: the -first extension is the _format_ of the template, and the second extension is the -_handler_ that will be used. Rails is attempting to find a template called -`articles/new` within `app/views` for the application. The format for this -template can only be `html` and the handler must be one of `erb`, `builder` or -`coffee`. Because you want to create a new HTML form, you will be using the `ERB` -language. Therefore the file should be called `articles/new.html.erb` and needs -to be located inside the `app/views` directory of the application. +`app/views/articles/new.html.erb`. The extension of this file name is important: +the first extension is the _format_ of the template, and the second extension +is the _handler_ that will be used. Rails is attempting to find a template +called `articles/new` within `app/views` for the application. The format for +this template can only be `html` and the handler must be one of `erb`, +`builder` or `coffee`. Because you want to create a new HTML form, you will be +using the `ERB` language which is designed to embed Ruby in HTML. + +Therefore the file should be called `articles/new.html.erb` and needs to be +located inside the `app/views` directory of the application. Go ahead now and create a new file at `app/views/articles/new.html.erb` and write this content in it: @@ -665,8 +667,8 @@ rake commands to run migrations, and it's possible to undo a migration after it's been applied to your database. Migration filenames include a timestamp to ensure that they're processed in the order that they were created. -If you look in the `db/migrate/20140120191729_create_articles.rb` file (remember, -yours will have a slightly different name), here's what you'll find: +If you look in the `db/migrate/YYYYMMDDHHMMSS_create_articles.rb` file +(remember, yours will have a slightly different name), here's what you'll find: ```ruby class CreateArticles < ActiveRecord::Migration @@ -675,7 +677,7 @@ class CreateArticles < ActiveRecord::Migration t.string :title t.text :text - t.timestamps + t.timestamps null: false end end end @@ -736,7 +738,7 @@ database columns. In the first line we do just that (remember that `@article.save` is responsible for saving the model in the database. Finally, we redirect the user to the `show` action, which we'll define later. -TIP: You might be wondering why the `A` in `Article.new` is capitalized above, whereas most other references to articles in this guide have used lowercase. In this context, we are referring to the class named `Article` that is defined in `\models\article.rb`. Class names in Ruby must begin with a capital letter. +TIP: You might be wondering why the `A` in `Article.new` is capitalized above, whereas most other references to articles in this guide have used lowercase. In this context, we are referring to the class named `Article` that is defined in `app/models/article.rb`. Class names in Ruby must begin with a capital letter. TIP: As we'll see later, `@article.save` returns a boolean indicating whether the article was saved or not. @@ -1537,7 +1539,7 @@ class CreateComments < ActiveRecord::Migration # this line adds an integer column called `article_id`. t.references :article, index: true - t.timestamps + t.timestamps null: false end end end |