[ANN] Action Pack 0.7.6: Do The Bug Fix

Discussion in 'Ruby' started by David Heinemeier Hansson, Jul 29, 2004.

  1. What's new in Action Pack 0.7.6?
    ================================

    Loads of bug fixes, added an ActiveRecordStore for sessions, included
    ERB::Util so text can be escaped with just calling “h”, changed the
    license to MIT License.

    Download from http://actionpack.rubyonrails.org, talk on #rubyonrails
    (FreeNet).


    * Included ERB::Util so all templates can easily escape HTML content
    with <%=h @person.content %>

    * All requests are now considered local by default, so everyone
    will be exposed to detailed debugging screens on errors.
    When the application is ready to go public, set
    ActionController::Base.consider_all_requests_local to false,
    and implement the protected method local_request? in the controller
    to determine when debugging screens should be shown.

    * Fixed three bugs with the url_for/redirect_to/link_to handling.
    Considering the url http://localhost:81/friends/show/1

    url_for:)action => "list")
    ...used to give http://localhost:81/friends/list/1
    ......now gives http://localhost:81/friends/list

    url_for:)controller => "friends", :action => "destroy", :id => 5)
    ...used to give http://localhost:81/friends/destroy
    ......now gives http://localhost:81/friends/destroy/5

    Considering the url http://localhost:81/teachers/show/t

    url_for:)action => "list", :id => 5)
    ...used to give http://localhost:81/5eachers/list/t
    ......now gives http://localhost:81/teachers/list/5

    [Reported by David Morton & Radsaq]

    * Logs exception to logfile in addition to showing them for local
    requests

    * Protects the eruby load behind a begin/rescue block. eRuby is not
    required to run ActionController.

    * Fixed install.rb to also install clean_logger and the templates

    * Added ActiveRecordStore as a session option. Read more in
    lib/action_controller/session/active_record_store.rb [Tim Bates]

    * Change license to MIT License (and included license file in package)

    * Application error page now returns status code 500 instead of 200

    * Fixed using Procs as layout handlers [Florian Weber]

    * Fixed bug with using redirects ports other than 80

    * Added index method that calls list on scaffolding


    P.S.: The new WEBrick option for Rails will be ported to a generic
    Action Pack option in the near future.


    How does Action Pack work?
    ==========================

    Action Pack splits the response to a web request into a controller part
    (performing the logic) and a view part (rendering a template). This
    two-step approach is known as an action, which will normally create,
    read, update, or delete (CRUD for short) some sort of model part (often
    backed by a database) before choosing either to render a template or
    redirecting to another action.

    Action Pack implements these actions as public methods on Action
    Controllers and uses Action Views to implement the template rendering.
    Action Controllers are then responsible for handling all the actions
    relating to a certain part of an application. This grouping usually
    consists of actions for lists and for CRUDs revolving around a single
    (or a few) model objects. So ContactController would be responsible for
    listing contacts, creating, deleting, and updating contacts. A
    WeblogController could be responsible for both posts and
    comments.

    Action View templates are written using embedded Ruby in tags mingled
    in with the HTML. To avoid cluttering the templates with code, a bunch
    of helper classes provide common behavior for forms, dates, and
    strings. And it's easy to add specific helpers to keep the separation
    as the application evolves.

    Note: Some of the features, such as scaffolding and form building, are
    tied to ActiveRecord[http://activerecord.rubyonrails.org] (an
    object-relational mapping package), but that doesn't mean that Action
    Pack depends on Active Record. Action Pack is an independent package
    that can be used with any sort
    of backend (Instiki[http://www.instiki.org], which is based on an older
    version of Action Pack, uses Madeleine for example). Read more about
    the role Action Pack can play when used together with Active Record on
    http://www.rubyonrails.org.


    A short rundown of the major features
    =====================================

    * Actions grouped in controller as methods instead of separate command
    objects and can therefore helper share methods.

    BlogController < ActionController::Base
    def display
    @customer = find_customer
    end

    def update
    @customer = find_customer
    @customer.attributes = @params["customer"]
    @customer.save ?
    redirect_to:)action => "display") :
    render("customer/edit")
    end

    private
    def find_customer() Customer.find(@params["id"]) end
    end

    Learn more in link:classes/ActionController/Base.html


    * Embedded Ruby for templates (no new "easy" template language)

    <% for post in @posts %>
    Title: <%= post.title %>
    <% end %>

    All post titles: <%= @post.collect{ |p| p.title }.join ", " %>

    <% unless @person.is_client? %>
    Not for clients to see...
    <% end %>

    Learn more in link:classes/ActionView.html


    * Filters for pre and post processing of the response (as methods,
    procs, and classes)

    class WeblogController < ActionController::Base
    before_filter :authenticate, :cache, :audit
    after_filter proc{|c| c.response.body =
    GZip::compress(c.response.body)}
    after_filter LocalizeFilter

    def list
    # Before this action is run, the user will be authenticated,
    the cache
    # will be examined to see if a valid copy of the results
    already
    # exist, and the action will be logged for auditing.

    # After this action has run, the output will first be localized
    then
    # compressed to minimize bandwith usage
    end

    private
    def authenticate
    # Implement the filter will full access to both request and
    response
    end
    end

    Learn more in link:classes/ActionController/Filters/ClassMethods.html


    * Helpers for forms, dates, action links, and text

    <%= text_field "post", "title", "size" => 30 %>
    <%= html_date_select(Date.today) %>
    <%= link_to "New post", :controller => "post", :action => "new" %>
    <%= truncate(post.title, 25) %>

    Learn more in link:classes/ActionView/Helpers.html


    * Layout sharing for template reuse (think simple version of Struts
    Tiles[http://jakarta.apache.org/struts/userGuide/dev_tiles.html])

    class WeblogController < ActionController::Base
    layout "weblog_layout"

    def hello_world
    end
    end

    Layout file (called weblog_layout):
    <html><body><%= @content_for_layout %></body></html>

    Template for hello_world action:
    <h1>Hello world</h1>

    Result of running hello_world action:
    <html><body><h1>Hello world</h1></body></html>

    Learn more in link:classes/ActionController/Layout.html


    * Advanced redirection that makes pretty urls easy

    RewriteRule ^/library/books/([A-Z]+)([0-9]+)/([-_a-zA-Z0-9]+)$ \
    /books_controller.cgi?action=$3&type=$1&code=$2 [QSA] [L]

    Accessing /library/books/ISBN/0743536703/show calls
    BooksController#show

    From that URL, you can rewrite the redirect in a number of ways:

    redirect_to:)action => "edit") =>
    /library/books/ISBN/0743536703/edit

    redirect_to:)path_params => { "type" => "XTC", "code" => "12354345"
    }) =>
    /library/books/XTC/12354345/show

    redirect_to:)controller_prefix => "admin", :controller =>
    "accounts") =>
    /admin/accounts/

    Learn more in link:classes/ActionController/Base.html


    * Easy testing of both controller and template result through
    TestRequest/Response

    class LoginControllerTest < Test::Unit::TestCase
    def setup
    @request = ActionController::TestRequest.new
    @request.host = "http://somewhere"
    end

    def test_succesful_authentication
    @request.action = "authenticate"
    @request.request_parameters["user_name"] = "david"
    @request.request_parameters["password"] = "secret"

    response = LoginController.process_test(@request)

    assert_equal(
    "http://somewhere/clients/", response.headers["location"])
    assert_equal Person.find(1), response.session["person"]
    assert(response.body.split("\n").include?(
    "<h1>You've been logged in!</h1>"))
    end
    end

    Learn more in link:classes/ActionController/TestRequest.html


    * Automated benchmarking and integrated logging

    Processing WeblogController#index (for 127.0.0.1 at Fri May 28
    00:41:55)
    Parameters: {"action"=>"index", "controller"=>"weblog"}
    Rendering weblog/index (200 OK)
    Completed in 0.029281 (34 reqs/sec)

    If Active Record is used as the model, you'll have the database
    debugging
    as well:

    Processing WeblogController#create (for 127.0.0.1 at Sat Jun 19
    14:04:23)
    Params: {"controller"=>"weblog", "action"=>"create",
    "post"=>{"title"=>"this is good"} }
    SQL (0.000627) INSERT INTO posts (title) VALUES('this is good')
    Redirected to http://test/weblog/display/5
    Completed in 0.221764 (4 reqs/sec) | DB: 0.059920 (27%)

    You specify a logger through a class method, such as:

    ActionController::Base.logger = Logger.new("Application Log")
    ActionController::Base.logger = Log4r::Logger.new("Application
    Log")


    * Powerful debugging mechanism for local requests

    All exceptions raised on actions performed on the request of a
    local user
    will be presented with a tailored debugging screen that includes
    exception
    message, stack trace, request parameters, session contents, and the
    half-finished response.

    Learn more in link:classes/ActionController/Rescue.html


    * Scaffolding for Action Record model objects

    require 'account' # must be an Active Record class
    class AccountController < AccountController::Base
    scaffolding :account
    end

    The AccountController now has the full CRUD range of actions and
    default
    templates: list, show, destroy, new, create, edit, update

    Learn more in
    link:classes/ActionController/Scaffolding/ClassMethods.html


    * Form building for Active Record model objects

    The post object has a title (varchar), content (text), and
    written_on (date)

    <%= form "post" %>

    ...will generate something like (the selects will have more options
    of
    course):

    <form action="create" method="POST">
    <p>
    <b>Title:</b><br/>
    <input type="text" name="post[title]" value="<%= @post.title
    %>" />
    </p>
    <p>
    <b>Content:</b><br/>
    <textarea name="post[content]"><%= @post.title %></textarea>
    </p>
    <p>
    <b>Written on:</b><br/>
    <select
    name='post[written_on(3i)]'><option>18</option></select>
    <select name='post[written_on(2i)]'><option
    value='7'>July</option></select>
    <select
    name='post[written_on(1i)]'><option>2004</option></select>
    </p>

    <input type="submit" value="Create">
    </form>

    This form generates a @params["post"] array that can be used
    directly in a save action:

    class WeblogController < ActionController::Base
    def save
    post = Post.create(@params["post"])
    redirect_to :action => "display", :path_params => { "id" =>
    post.id }
    end
    end

    Learn more in link:classes/ActionView/Helpers/ActiveRecordHelper.html


    * Automated mapping of URLs to controller/action pairs through Apache's
    mod_rewrite

    Requesting /blog/display/5 will call BlogController#display and
    make 5 available as an instance variable through @params["id"]


    * Runs on top of CGI, FCGI, and mod_ruby

    See the address_book_controller example for all three forms

    --
    David Heinemeier Hansson,
    http://www.rubyonrails.org/ -- Web-application framework for Ruby
    http://www.instiki.org/ -- A No-Step-Three Wiki in Ruby
    http://www.basecamphq.com/ -- Web-based Project Management
    http://www.loudthinking.com/ -- Broadcasting Brain
    http://www.nextangle.com/ -- Development & Consulting Services
    David Heinemeier Hansson, Jul 29, 2004
    #1
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