Improve Rails README [#4740 state:resolved]

Signed-off-by: Rizwan Reza <rizwanreza@gmail.com>
This commit is contained in:
Matt Di Pasquale 2010-03-24 02:17:09 -04:00 committed by Rizwan Reza
parent 344a695383
commit 1535b02a9f
2 changed files with 296 additions and 198 deletions

@ -3,12 +3,13 @@
Rails is a web-application framework that includes everything needed to create
database-backed web applications according to the Model-View-Control pattern.
This pattern splits the view (also called the presentation) into "dumb" templates
that are primarily responsible for inserting pre-built data in between HTML tags.
The model contains the "smart" domain objects (such as Account, Product, Person,
Post) that holds all the business logic and knows how to persist themselves to
a database. The controller handles the incoming requests (such as Save New Account,
Update Product, Show Post) by manipulating the model and directing data to the view.
This pattern splits the view (also called the presentation) into "dumb"
templates that are primarily responsible for inserting pre-built data in between
HTML tags. The model contains the "smart" domain objects (such as Account,
Product, Person, Post) that holds all the business logic and knows how to
persist themselves to a database. The controller handles the incoming requests
(such as Save New Account, Update Product, Show Post) by manipulating the model
and directing data to the view.
In Rails, the model is handled by what's called an object-relational mapping
layer entitled Active Record. This layer allows you to present the data from
@ -21,35 +22,45 @@ layers by its two parts: Action View and Action Controller. These two layers
are bundled in a single package due to their heavy interdependence. This is
unlike the relationship between the Active Record and Action Pack that is much
more separate. Each of these packages can be used independently outside of
Rails. You can read more about Action Pack in
Rails. You can read more about Action Pack in
link:files/vendor/rails/actionpack/README.html.
== Getting Started
1. At the command prompt, start a new Rails application using the <tt>rails</tt> command
and your application name. Ex: <tt>rails myapp</tt>
2. Change directory into myapp and start the web server: <tt>rails server</tt> (run with --help for options)
3. Go to http://localhost:3000/ and get "Welcome aboard: You're riding the Rails!"
4. Follow the guidelines to start developing your application
1. At the command prompt, create a new Rails application:
<tt>rails myapp</tt> (where <tt>myapp</tt> is the application name)
2. Change directory to <tt>myapp</tt> and start the web server:
<tt>cd myapp; rails server</tt> (run with --help for options)
3. Go to http://localhost:3000/ and get:
"Welcome aboard: You're riding the Rails!"
4. Follow the guidelines to start developing your application.
== Web Servers
By default, Rails will try to use Mongrel if it's installed when started with <tt>rails server</tt>, otherwise
Rails will use WEBrick, the webserver that ships with Ruby. But you can also use Rails with a variety of
other web servers.
By default, Rails will try to use Mongrel if it's installed when started with
<tt>rails server</tt>, otherwise Rails will use WEBrick, the web server that
ships with Ruby.
Mongrel is a Ruby-based webserver with a C component (which requires compilation) that is
suitable for development and deployment of Rails applications. If you have Ruby Gems installed,
getting up and running with mongrel is as easy as: <tt>gem install mongrel</tt>.
Mongrel is a Ruby-based web server with a C component (which requires
compilation) that is suitable for development and deployment of Rails
applications. If you have Ruby Gems installed, getting up and running with
mongrel is as easy as: <tt>sudo gem install mongrel</tt>.
More info at: http://mongrel.rubyforge.org
Other ruby web servers exist which can run your rails application, however <tt>rails server</tt> does
not search for them or start them. These include {Thin}[http://code.macournoyer.com/thin/], {Ebb}[http://ebb.rubyforge.org/], and Apache with {mod_rails}[http://www.modrails.com/].
You can alternatively run Rails applications with other Ruby web servers, e.g.,
{Thin}[http://code.macournoyer.com/thin/], {Ebb}[http://ebb.rubyforge.org/], and
Apache with {mod_rails}[http://www.modrails.com/]. However, <tt>rails server</tt>
doesn't search for or start them.
For production use, often a web/proxy server such as {Apache}[http://apache.org], {Nginx}[http://nginx.net/], {LiteSpeed}[http://litespeedtech.com/], {Lighttpd}[http://www.lighttpd.net/] or {IIS}[http://www.iis.net/] is
deployed as the front-end server, with the chosen ruby web server running in the back-end
For production use, often a web/proxy server, e.g., {Apache}[http://apache.org],
{Nginx}[http://nginx.net/], {LiteSpeed}[http://litespeedtech.com/],
{Lighttpd}[http://www.lighttpd.net/], or {IIS}[http://www.iis.net/], is deployed
as the front end server with the chosen Ruby web server running in the back end
and receiving the proxied requests via one of several protocols (HTTP, CGI, FCGI).
@ -85,24 +96,25 @@ set the RewriteBase in this htaccess file.
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ dispatch.cgi [QSA,L]
Incase Rails experiences terminal errors instead of displaying those messages you
can supply a file here which will be rendered instead.
In case Rails experiences terminal errors, you may supply a file here to be
rendered instead.
ErrorDocument 500 /500.html
ErrorDocument 500 "<h2>Application error</h2>Rails application failed to start properly"
ErrorDocument 500 "<h2>Application Error</h2>Rails failed to start properly."
== Debugging Rails
Sometimes your application goes wrong. Fortunately there are a lot of tools that
Sometimes your application goes wrong. Fortunately there are a lot of tools that
will help you debug it and get it back on the rails.
First area to check is the application log files. Have "tail -f" commands running
on the server.log and development.log. Rails will automatically display debugging
and runtime information to these files. Debugging info will also be shown in the
browser on requests from 127.0.0.1.
First area to check is the application log files. Have "tail -f" commands
running on the server.log and development.log. Rails will automatically display
debugging and runtime information to these files. Debugging info will also be
shown in the browser on requests from 127.0.0.1.
You can also log your own messages directly into the log file from your code using
the Ruby logger class from inside your controllers. Example:
You can also log your own messages directly into the log file from your code
using the Ruby logger class from inside your controllers. Example:
class WeblogController < ActionController::Base
def destroy
@ -114,26 +126,26 @@ the Ruby logger class from inside your controllers. Example:
The result will be a message in your log file along the lines of:
Mon Oct 08 14:22:29 +1000 2007 Destroyed Weblog ID #1
Mon Oct 08 14:22:29 +1000 2007 Destroyed Weblog ID #1!
More information on how to use the logger is at http://www.ruby-doc.org/core/
Also, Ruby documentation can be found at http://www.ruby-lang.org/ including:
* The Learning Ruby (Pickaxe) Book: http://www.ruby-doc.org/docs/ProgrammingRuby/
* Learn to Program: http://pine.fm/LearnToProgram/ (a beginners guide)
* Programming Ruby: http://www.ruby-doc.org/docs/ProgrammingRuby/ (Pickaxe)
* Learn to Program: http://pine.fm/LearnToProgram/ (a beginners guide)
These two online (and free) books will bring you up to speed on the Ruby language
and also on programming in general.
These two online (and free) books will bring you up to speed on the Ruby
language and also on programming in general.
== Debugger
Debugger support is available through the debugger command when you start your Mongrel or
Webrick server with --debugger. This means that you can break out of execution at any point
in the code, investigate and change the model, AND then resume execution!
You need to install ruby-debug to run the server in debugging mode. With gems, use 'gem install ruby-debug'
Example:
Debugger support is available through the debugger command when you start your
Mongrel or WEBrick server with --debugger. This means that you can break out of
execution at any point in the code, investigate and change the model, and then,
resume execution! You need to install ruby-debug to run the server in debugging
mode. With gems, use <tt>sudo gem install ruby-debug</tt>. Example:
class WeblogController < ActionController::Base
def index
@ -146,12 +158,14 @@ So the controller will accept the action, run the first line, then present you
with a IRB prompt in the server window. Here you can do things like:
>> @posts.inspect
=> "[#<Post:0x14a6be8 @attributes={\"title\"=>nil, \"body\"=>nil, \"id\"=>\"1\"}>,
#<Post:0x14a6620 @attributes={\"title\"=>\"Rails you know!\", \"body\"=>\"Only ten..\", \"id\"=>\"2\"}>]"
=> "[#<Post:0x14a6be8
@attributes={"title"=>nil, "body"=>nil, "id"=>"1"}>,
#<Post:0x14a6620
@attributes={"title"=>"Rails", "body"=>"Only ten..", "id"=>"2"}>]"
>> @posts.first.title = "hello from a debugger"
=> "hello from a debugger"
...and even better is that you can examine how your runtime objects actually work:
...and even better, you can examine how your runtime objects actually work:
>> f = @posts.first
=> #<Post:0x13630c4 @attributes={"title"=>nil, "body"=>nil, "id"=>"1"}>
@ -163,28 +177,37 @@ Finally, when you're ready to resume execution, you enter "cont"
== Console
The console is a ruby shell, which allows you to interact with your application's domain
model. Here you'll have all parts of the application configured, just like it is when the
application is running. You can inspect domain models, change values, and save to the
database. Starting the script without arguments will launch it in the development environment.
The console is a Ruby shell, which allows you to interact with your
application's domain model. Here you'll have all parts of the application
configured, just like it is when the application is running. You can inspect
domain models, change values, and save to the database. Starting the script
without arguments will launch it in the development environment.
To start the console, just run <tt>rails console</tt> from the application directory.
To start the console, run <tt>rails console</tt> from the application
directory.
Options:
* Passing the <tt>-s, --sandbox</tt> argument will rollback any modifications made to the database.
* Passing an environment name as an argument will load the corresponding environment.
Example: <tt>rails console production</tt>.
* Passing the <tt>-s, --sandbox</tt> argument will rollback any modifications
made to the database.
* Passing an environment name as an argument will load the corresponding
environment. Example: <tt>rails console production</tt>.
To reload your controllers and models after launching the console run
<tt>reload!</tt>
More information about irb can be found at:
link:http://www.rubycentral.com/pickaxe/irb.html
More information about irb can be found at link:http://www.rubycentral.com/pickaxe/irb.html
== dbconsole
You can go to the command line of your database directly through <tt>rails dbconsole</tt>.
You would be connected to the database with the credentials defined in database.yml.
Starting the script without arguments will connect you to the development database. Passing an
argument will connect you to a different database, like <tt>rails dbconsole production</tt>.
Currently works for mysql, postgresql and sqlite.
You can go to the command line of your database directly through <tt>rails
dbconsole</tt>. You would be connected to the database with the credentials
defined in database.yml. Starting the script without arguments will connect you
to the development database. Passing an argument will connect you to a different
database, like <tt>rails dbconsole production</tt>. Currently works for mysql,
postgresql and sqlite.
== Description of Contents
@ -230,8 +253,8 @@ app
app/controllers
Holds controllers that should be named like weblogs_controller.rb for
automated URL mapping. All controllers should descend from ApplicationController
which itself descends from ActionController::Base.
automated URL mapping. All controllers should descend from
ApplicationController which itself descends from ActionController::Base.
app/models
Holds models that should be named like post.rb.
@ -239,48 +262,53 @@ app/models
app/views
Holds the template files for the view that should be named like
weblogs/index.html.erb for the WeblogsController#index action. All views use eRuby
syntax.
weblogs/index.html.erb for the WeblogsController#index action. All views use
eRuby syntax.
app/views/layouts
Holds the template files for layouts to be used with views. This models the common
header/footer method of wrapping views. In your views, define a layout using the
<tt>layout :default</tt> and create a file named default.html.erb. Inside default.html.erb,
call <% yield %> to render the view using this layout.
Holds the template files for layouts to be used with views. This models the
common header/footer method of wrapping views. In your views, define a layout
using the <tt>layout :default</tt> and create a file named default.html.erb.
Inside default.html.erb, call <% yield %> to render the view using this
layout.
app/helpers
Holds view helpers that should be named like weblogs_helper.rb. These are generated
for you automatically when using <tt>rails generate</tt> for controllers. Helpers can be used to
wrap functionality for your views into methods.
Holds view helpers that should be named like weblogs_helper.rb. These are
generated for you automatically when using rails generate for controllers.
Helpers can be used to wrap functionality for your views into methods.
config
Configuration files for the Rails environment, the routing map, the database, and other dependencies.
Configuration files for the Rails environment, the routing map, the database,
and other dependencies.
db
Contains the database schema in schema.rb. db/migrate contains all
the sequence of Migrations for your schema.
Contains the database schema in schema.rb. db/migrate contains all the
sequence of Migrations for your schema.
doc
This directory is where your application documentation will be stored when generated
using <tt>rake doc:app</tt>
This directory is where your application documentation will be stored when
generated using <tt>rake doc:app</tt>
lib
Application specific libraries. Basically, any kind of custom code that doesn't
belong under controllers, models, or helpers. This directory is in the load path.
Application specific libraries. Basically, any kind of custom code that
doesn't belong under controllers, models, or helpers. This directory is in
the load path.
public
The directory available for the web server. Contains subdirectories for images, stylesheets,
and javascripts. Also contains the dispatchers and the default HTML files. This should be
set as the DOCUMENT_ROOT of your web server.
The directory available for the web server. Contains subdirectories for
images, stylesheets, and javascripts. Also contains the dispatchers and the
default HTML files. This should be set as the DOCUMENT_ROOT of your web
server.
script
Helper scripts for automation and generation.
test
Unit and functional tests along with fixtures. When using the <tt>rails generate</tt> scripts, template
test files will be generated for you and placed in this directory.
Unit and functional tests along with fixtures. When using the rails generate
command, template test files will be generated for you and placed in this
directory.
vendor
External libraries that the application depends on. Also includes the plugins subdirectory.
If the app has frozen rails, those gems also go here, under vendor/rails/.
This directory is in the load path.
External libraries that the application depends on. Also includes the plugins
subdirectory. If the app has frozen rails, those gems also go here, under
vendor/rails/. This directory is in the load path.

@ -1,14 +1,15 @@
== Welcome to Rails
Rails is a web-application framework that includes everything needed to create
database-backed web applications according to the Model-View-Control pattern.
Rails is a web-application framework that includes everything needed to create
database-backed web applications according to the Model-View-Control pattern.
This pattern splits the view (also called the presentation) into "dumb" templates
that are primarily responsible for inserting pre-built data in between HTML tags.
The model contains the "smart" domain objects (such as Account, Product, Person,
Post) that holds all the business logic and knows how to persist themselves to
a database. The controller handles the incoming requests (such as Save New Account,
Update Product, Show Post) by manipulating the model and directing data to the view.
This pattern splits the view (also called the presentation) into "dumb"
templates that are primarily responsible for inserting pre-built data in between
HTML tags. The model contains the "smart" domain objects (such as Account,
Product, Person, Post) that holds all the business logic and knows how to
persist themselves to a database. The controller handles the incoming requests
(such as Save New Account, Update Product, Show Post) by manipulating the model
and directing data to the view.
In Rails, the model is handled by what's called an object-relational mapping
layer entitled Active Record. This layer allows you to present the data from
@ -21,90 +22,99 @@ layers by its two parts: Action View and Action Controller. These two layers
are bundled in a single package due to their heavy interdependence. This is
unlike the relationship between the Active Record and Action Pack that is much
more separate. Each of these packages can be used independently outside of
Rails. You can read more about Action Pack in
Rails. You can read more about Action Pack in
link:files/vendor/rails/actionpack/README.html.
== Getting Started
1. At the command prompt, start a new Rails application using the <tt>rails</tt> command
and your application name. Ex: rails myapp
2. Change directory into myapp and start the web server: <tt>rails server</tt> (run with --help for options)
3. Go to http://localhost:3000/ and get "Welcome aboard: You're riding the Rails!"
4. Follow the guidelines to start developing your application
1. At the command prompt, create a new Rails application:
<tt>rails myapp</tt> (where <tt>myapp</tt> is the application name)
2. Change directory to <tt>myapp</tt> and start the web server:
<tt>cd myapp; rails server</tt> (run with --help for options)
3. Go to http://localhost:3000/ and get:
"Welcome aboard: You're riding the Rails!"
4. Follow the guidelines to start developing your application.
== Web Servers
By default, Rails will try to use Mongrel if it's installed when started with <tt>rails server</tt>, otherwise
Rails will use WEBrick, the webserver that ships with Ruby. But you can also use Rails
with a variety of other web servers.
By default, Rails will try to use Mongrel if it's installed when started with
<tt>rails server</tt>, otherwise Rails will use WEBrick, the web server that
ships with Ruby.
Mongrel is a Ruby-based webserver with a C component (which requires compilation) that is
suitable for development and deployment of Rails applications. If you have Ruby Gems installed,
getting up and running with mongrel is as easy as: <tt>gem install mongrel</tt>.
Mongrel is a Ruby-based web server with a C component (which requires
compilation) that is suitable for development and deployment of Rails
applications. If you have Ruby Gems installed, getting up and running with
mongrel is as easy as: <tt>sudo gem install mongrel</tt>.
More info at: http://mongrel.rubyforge.org
You can also use other Ruby web servers like Thin and Ebb or regular web servers like Apache, LiteSpeed,
Lighttpd, or IIS. The Ruby web servers are run through Rack and the others can be setup to use
FCGI or proxy to a pack of Mongrels/Thin/Ebb servers.
You can alternatively run Rails applications with other Ruby web servers, e.g.,
{Thin}[http://code.macournoyer.com/thin/], {Ebb}[http://ebb.rubyforge.org/], and
Apache with {mod_rails}[http://www.modrails.com/]. However, <tt>rails server</tt>
doesn't search for or start them.
For production use, often a web/proxy server, e.g., {Apache}[http://apache.org],
{Nginx}[http://nginx.net/], {LiteSpeed}[http://litespeedtech.com/],
{Lighttpd}[http://www.lighttpd.net/], or {IIS}[http://www.iis.net/], is deployed
as the front end server with the chosen Ruby web server running in the back end
and receiving the proxied requests via one of several protocols (HTTP, CGI, FCGI).
== Apache .htaccess example for FCGI/CGI
# General Apache options
AddHandler fastcgi-script .fcgi
AddHandler cgi-script .cgi
Options +FollowSymLinks +ExecCGI
General Apache options
# If you don't want Rails to look in certain directories,
# use the following rewrite rules so that Apache won't rewrite certain requests
#
# Example:
# RewriteCond %{REQUEST_URI} ^/notrails.*
# RewriteRule .* - [L]
AddHandler fastcgi-script .fcgi
AddHandler cgi-script .cgi
Options +FollowSymLinks +ExecCGI
# Redirect all requests not available on the filesystem to Rails
# By default the cgi dispatcher is used which is very slow
#
# For better performance replace the dispatcher with the fastcgi one
#
# Example:
# RewriteRule ^(.*)$ dispatch.fcgi [QSA,L]
RewriteEngine On
If you don't want Rails to look in certain directories, use the following
rewrite rules so that Apache won't rewrite certain requests.
# If your Rails application is accessed via an Alias directive,
# then you MUST also set the RewriteBase in this htaccess file.
#
# Example:
# Alias /myrailsapp /path/to/myrailsapp/public
# RewriteBase /myrailsapp
RewriteCond %{REQUEST_URI} ^/notrails.*
RewriteRule .* - [L]
RewriteRule ^$ index.html [QSA]
RewriteRule ^([^.]+)$ $1.html [QSA]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ dispatch.cgi [QSA,L]
Redirect all requests not available on the filesystem to Rails. By default the
cgi dispatcher is used which is very slow, for better performance replace the
dispatcher with the fastcgi one.
# In case Rails experiences terminal errors
# Instead of displaying this message you can supply a file here which will be rendered instead
#
# Example:
# ErrorDocument 500 /500.html
RewriteRule ^(.*)$ dispatch.fcgi [QSA,L]
RewriteEngine On
ErrorDocument 500 "<h2>Application error</h2>Rails application failed to start properly"
If your Rails application is accessed via an Alias directive, then you MUST also
set the RewriteBase in this htaccess file.
Alias /myrailsapp /path/to/myrailsapp/public
RewriteBase /myrailsapp
RewriteRule ^$ index.html [QSA]
RewriteRule ^([^.]+)$ $1.html [QSA]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ dispatch.cgi [QSA,L]
In case Rails experiences terminal errors, you may supply a file here to be
rendered instead.
ErrorDocument 500 /500.html
ErrorDocument 500 "<h2>Application Error</h2>Rails failed to start properly."
== Debugging Rails
Sometimes your application goes wrong. Fortunately there are a lot of tools that
Sometimes your application goes wrong. Fortunately there are a lot of tools that
will help you debug it and get it back on the rails.
First area to check is the application log files. Have "tail -f" commands running
on the server.log and development.log. Rails will automatically display debugging
and runtime information to these files. Debugging info will also be shown in the
browser on requests from 127.0.0.1.
First area to check is the application log files. Have "tail -f" commands
running on the server.log and development.log. Rails will automatically display
debugging and runtime information to these files. Debugging info will also be
shown in the browser on requests from 127.0.0.1.
You can also log your own messages directly into the log file from your code using
the Ruby logger class from inside your controllers. Example:
You can also log your own messages directly into the log file from your code
using the Ruby logger class from inside your controllers. Example:
class WeblogController < ActionController::Base
def destroy
@ -122,20 +132,20 @@ More information on how to use the logger is at http://www.ruby-doc.org/core/
Also, Ruby documentation can be found at http://www.ruby-lang.org/ including:
* The Learning Ruby (Pickaxe) Book: http://www.ruby-doc.org/docs/ProgrammingRuby/
* Learn to Program: http://pine.fm/LearnToProgram/ (a beginner's guide)
* Programming Ruby: http://www.ruby-doc.org/docs/ProgrammingRuby/ (Pickaxe)
* Learn to Program: http://pine.fm/LearnToProgram/ (a beginners guide)
These two online (and free) books will bring you up to speed on the Ruby language
and also on programming in general.
These two online (and free) books will bring you up to speed on the Ruby
language and also on programming in general.
== Debugger
Debugger support is available through the debugger command when you start your Mongrel or
Webrick server with --debugger. This means that you can break out of execution at any point
in the code, investigate and change the model, AND then resume execution!
You need to install ruby-debug to run the server in debugging mode. With gems, use 'gem install ruby-debug'
Example:
Debugger support is available through the debugger command when you start your
Mongrel or WEBrick server with --debugger. This means that you can break out of
execution at any point in the code, investigate and change the model, and then,
resume execution! You need to install ruby-debug to run the server in debugging
mode. With gems, use <tt>sudo gem install ruby-debug</tt>. Example:
class WeblogController < ActionController::Base
def index
@ -148,12 +158,14 @@ So the controller will accept the action, run the first line, then present you
with a IRB prompt in the server window. Here you can do things like:
>> @posts.inspect
=> "[#<Post:0x14a6be8 @attributes={\"title\"=>nil, \"body\"=>nil, \"id\"=>\"1\"}>,
#<Post:0x14a6620 @attributes={\"title\"=>\"Rails you know!\", \"body\"=>\"Only ten..\", \"id\"=>\"2\"}>]"
=> "[#<Post:0x14a6be8
@attributes={"title"=>nil, "body"=>nil, "id"=>"1"}>,
#<Post:0x14a6620
@attributes={"title"=>"Rails", "body"=>"Only ten..", "id"=>"2"}>]"
>> @posts.first.title = "hello from a debugger"
=> "hello from a debugger"
...and even better is that you can examine how your runtime objects actually work:
...and even better, you can examine how your runtime objects actually work:
>> f = @posts.first
=> #<Post:0x13630c4 @attributes={"title"=>nil, "body"=>nil, "id"=>"1"}>
@ -165,31 +177,84 @@ Finally, when you're ready to resume execution, you enter "cont"
== Console
You can interact with the domain model by starting the console through <tt>rails console</tt>.
Here you'll have all parts of the application configured, just like it is when the
application is running. You can inspect domain models, change values, and save to the
database. Starting the script without arguments will launch it in the development environment.
Passing an argument will specify a different environment, like <tt>rails console production</tt>.
The console is a Ruby shell, which allows you to interact with your
application's domain model. Here you'll have all parts of the application
configured, just like it is when the application is running. You can inspect
domain models, change values, and save to the database. Starting the script
without arguments will launch it in the development environment.
To start the console, run <tt>rails console</tt> from the application
directory.
Options:
* Passing the <tt>-s, --sandbox</tt> argument will rollback any modifications
made to the database.
* Passing an environment name as an argument will load the corresponding
environment. Example: <tt>rails console production</tt>.
To reload your controllers and models after launching the console run
<tt>reload!</tt>
More information about irb can be found at:
link:http://www.rubycentral.com/pickaxe/irb.html
To reload your controllers and models after launching the console run <tt>reload!</tt>
== dbconsole
You can go to the command line of your database directly through <tt>rails dbconsole</tt>.
You would be connected to the database with the credentials defined in database.yml.
Starting the script without arguments will connect you to the development database. Passing an
argument will connect you to a different database, like <tt>rails dbconsole production</tt>.
Currently works for mysql, postgresql and sqlite.
You can go to the command line of your database directly through <tt>rails
dbconsole</tt>. You would be connected to the database with the credentials
defined in database.yml. Starting the script without arguments will connect you
to the development database. Passing an argument will connect you to a different
database, like <tt>rails dbconsole production</tt>. Currently works for mysql,
postgresql and sqlite.
== Description of Contents
The default directory structure of a generated Ruby on Rails applicartion:
|-- app
| |-- controllers
| |-- helpers
| |-- models
| `-- views
| `-- layouts
|-- config
| |-- environments
| |-- initializers
| `-- locales
|-- db
|-- doc
|-- lib
| `-- tasks
|-- log
|-- public
| |-- images
| |-- javascripts
| `-- stylesheets
|-- script
| `-- performance
|-- test
| |-- fixtures
| |-- functional
| |-- integration
| |-- performance
| `-- unit
|-- tmp
| |-- cache
| |-- pids
| |-- sessions
| `-- sockets
`-- vendor
`-- plugins
app
Holds all the code that's specific to this particular application.
app/controllers
Holds controllers that should be named like weblogs_controller.rb for
automated URL mapping. All controllers should descend from ApplicationController
which itself descends from ActionController::Base.
automated URL mapping. All controllers should descend from
ApplicationController which itself descends from ActionController::Base.
app/models
Holds models that should be named like post.rb.
@ -197,48 +262,53 @@ app/models
app/views
Holds the template files for the view that should be named like
weblogs/index.html.erb for the WeblogsController#index action. All views use eRuby
syntax.
weblogs/index.html.erb for the WeblogsController#index action. All views use
eRuby syntax.
app/views/layouts
Holds the template files for layouts to be used with views. This models the common
header/footer method of wrapping views. In your views, define a layout using the
<tt>layout :default</tt> and create a file named default.html.erb. Inside default.html.erb,
call <% yield %> to render the view using this layout.
Holds the template files for layouts to be used with views. This models the
common header/footer method of wrapping views. In your views, define a layout
using the <tt>layout :default</tt> and create a file named default.html.erb.
Inside default.html.erb, call <% yield %> to render the view using this
layout.
app/helpers
Holds view helpers that should be named like weblogs_helper.rb. These are generated
for you automatically when using rails generate for controllers. Helpers can be used to
wrap functionality for your views into methods.
Holds view helpers that should be named like weblogs_helper.rb. These are
generated for you automatically when using rails generate for controllers.
Helpers can be used to wrap functionality for your views into methods.
config
Configuration files for the Rails environment, the routing map, the database, and other dependencies.
Configuration files for the Rails environment, the routing map, the database,
and other dependencies.
db
Contains the database schema in schema.rb. db/migrate contains all
the sequence of Migrations for your schema.
Contains the database schema in schema.rb. db/migrate contains all the
sequence of Migrations for your schema.
doc
This directory is where your application documentation will be stored when generated
using <tt>rake doc:app</tt>
This directory is where your application documentation will be stored when
generated using <tt>rake doc:app</tt>
lib
Application specific libraries. Basically, any kind of custom code that doesn't
belong under controllers, models, or helpers. This directory is in the load path.
Application specific libraries. Basically, any kind of custom code that
doesn't belong under controllers, models, or helpers. This directory is in
the load path.
public
The directory available for the web server. Contains subdirectories for images, stylesheets,
and javascripts. Also contains the dispatchers and the default HTML files. This should be
set as the DOCUMENT_ROOT of your web server.
The directory available for the web server. Contains subdirectories for
images, stylesheets, and javascripts. Also contains the dispatchers and the
default HTML files. This should be set as the DOCUMENT_ROOT of your web
server.
script
Helper scripts for automation and generation.
test
Unit and functional tests along with fixtures. When using the rails generate command, template
test files will be generated for you and placed in this directory.
Unit and functional tests along with fixtures. When using the rails generate
command, template test files will be generated for you and placed in this
directory.
vendor
External libraries that the application depends on. Also includes the plugins subdirectory.
If the app has frozen rails, those gems also go here, under vendor/rails/.
This directory is in the load path.
External libraries that the application depends on. Also includes the plugins
subdirectory. If the app has frozen rails, those gems also go here, under
vendor/rails/. This directory is in the load path.