Rails 3 Basics - Revision history

Scott: /* Routing */

2011-12-06T19:06:59Z

Routing

← Older revision		Revision as of 19:06, 6 December 2011
Line 112:		Line 112:
	To create a link to this route (old way):		To create a link to this route (old way):
	<pre>		<pre>
	link_to "Products", :controller => "products", :action => "show", :id => 1		link_to "Products", :controller => "products", :action => "show", :id => 8
	</pre>		</pre>

Scott: /* Application Setup */

2011-09-07T18:34:32Z

Application Setup

← Older revision		Revision as of 18:34, 7 September 2011
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	rails new my_project -d mysql # if you don't want the default sqlite3		rails new my_project -d mysql # if you don't want the default sqlite3
	</pre>		</pre>
	* add gem dependencies to <code>Gemfile</code> at the root level		* add gem dependencies to <code>Gemfile</code> at the root level, then run "<code>bundle install</code>" as root to install required gems.
	* update <code>config/application.rb</code> to load needed dependencies and update defaults		* update <code>config/application.rb</code> to load needed dependencies and update defaults
	* double-check <code>/config/initializers</code> and <code>/config/environments</code>		* double-check <code>/config/initializers</code> and <code>/config/environments</code>

Scott: /* Application Setup */

2011-09-07T15:36:04Z

Application Setup

← Older revision		Revision as of 15:36, 7 September 2011
Line 3:		Line 3:
	<pre>		<pre>
	rails new my_project		rails new my_project
	rails -d mysql ~~new my_project~~ # if you don't want the default sqlite3		rails new my_project -d mysql # if you don't want the default sqlite3
	</pre>		</pre>
	* add gem dependencies to <code>Gemfile</code> at the root level		* add gem dependencies to <code>Gemfile</code> at the root level

Scott: /* Logging */

2011-08-26T18:50:43Z

Logging

← Older revision		Revision as of 18:50, 26 August 2011
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	== Logging ==		== Logging ==
	Use these in ~~models,~~ views, controllers to send timestamped messages to the log.		Use these in views and controllers to send timestamped messages to the log.
	<source lang="ruby">		<source lang="ruby">
	logger.debug "debug message"		logger.debug "debug message"
Line 133:		Line 133:
	logger.error "something broke"		logger.error "something broke"
	logger.fatal "application dead"		logger.fatal "application dead"
			</source>
			In Models, you need something like this:
			<source lang="ruby">
			ActiveRecord::Base.logger.debug
	</source>		</source>

Scott: Created page with '== Application Setup == * create project with

 rails new my_project rails -d mysql new my_project  # if you don't want the default sqlite3

* add gem dependencies to <…'

2011-06-28T21:01:35Z

Created page with '== Application Setup == * create project with <pre> rails new my_project rails -d mysql new my_project # if you don't want the default sqlite3 </pre> * add gem dependencies to <…'

New page

== Application Setup ==
* create project with
<pre>
rails new my_project
rails -d mysql new my_project # if you don't want the default sqlite3
</pre>
* add gem dependencies to <code>Gemfile</code> at the root level
* update <code>config/application.rb</code> to load needed dependencies and update defaults
* double-check <code>/config/initializers</code> and <code>/config/environments</code>
* edit <code>config/database.yml</code> to connect to your database

=== Notes ===
Files in <code>lib/</code> are not automatically loaded, so you need to <code>require</code> them.

In <code>config/environments/development.rb</code>, set
<pre>
config.action_mailer.perform_deliveries = false
</pre>
No delivery attempt is performed, but you can still see the mail in the log file to check it looks good

== Database Setup ==
* create database with
<pre>
rake db:create
</pre>

=== Create a table and its controller ===
<pre>
rails generate model Article
</pre>
Edit <code>db/migrate/20100223220648_create_articles.rb</code> to look like this:
<source lang="ruby">
class CreateArticles < ActiveRecord::Migration
def self.up
create_table :articles do |t|
t.string :title
t.text :body
t.datetime :published_at
t.timestamps
end
end
def self.down
drop_table :articles
end
end
</source>
To create/update the table:
<pre>
rake db:migrate
</pre>
To generate the controller:
<pre>
rails generate controller articles
</pre>

=== Make a scaffold ===
To make a scaffold for the table to allow easy create/update/delete in development:
<pre>
rails generate scaffold Article title:string body:text published_at:datetime --skip-migration
</pre>
WARNING: As you develop your application, you will eventually replace most or even all of the code that the scaffold generates in the controller.

=== Update table and scaffold ===
To modify the table, generate a custom migration:
<pre>
rails generate migration add_excerpt_and_location_to_articles excerpt:string location:string
</pre>
creates this migration file <code>db/migrate/20100223232337_add_excerpt_and_location_to_articles.rb</code>:
<source lang="ruby">
class AddExcerptAndLocationToArticles < ActiveRecord::Migration
def self.up
add_column :articles, :excerpt, :string
add_column :articles, :location, :string
end
def self.down
remove_column :articles,
:excerpt remove_column :articles, :location
end
end
</source>
Run <code>rake db:migrate</code> again to update the database.

Now update the scaffold:
<pre>
rails generate scaffold Article title:string location:string excerpt:string body:text published_at:datetime --skip-migration
</pre>

=== Add validations to the model ===
Edit <code>app/models/article.rb</code>:
<source lang="ruby">
class Article < ActiveRecord::Base
validates :title, :presence => true
validates :body, :presence => true
end
</source>

== Other rails commands ==
<pre>
rails console
rails dbconsole
rails server
rails runner
</pre>

== Routing ==
Configured in <code>config/routes.rb</code>
<pre>
match 'products/:id' => 'products#show'
</pre>
The url <code><nowiki>http://localhost:3000/products/8</nowiki></code> will be mapped to the <code>show</code> action of the <code>products</code> controller with <code>params[:id]</code> set to 8

To create a link to this route (old way):
<pre>
link_to "Products", :controller => "products", :action => "show", :id => 1
</pre>

To restrict the HTTP method, use get or post instead of match:
<pre>
get 'products/:id' => 'products#show'
</pre>

To redirect:
<pre>
match "/foo", :to => redirect("/bar")
</pre>

== Logging ==
Use these in models, views, controllers to send timestamped messages to the log.
<source lang="ruby">
logger.debug "debug message"
logger.info "info message"
logger.warn "something bad"
logger.error "something broke"
logger.fatal "application dead"
</source>