Ruby on Rails

  Today's Topic Summary

Group: http://groups.google.com/group/rubyonrails-talk/topics

• design decision [2 Updates]
• STI, xml/xslt, or ? for many custom forms/templates [1 Update]
• problem in using xsendfile apche+mongrel [6 Updates]
• Rails 3 - Creating a comment and then returning the Partial with JUST the new comment [2 Updates]
• Rails 3 + jQuery ; How to show error messages [1 Update]
• Question about securing videos [3 Updates]
• rails3 validate email format [6 Updates]
• Freelancers: small site implementation [1 Update]
• rails3 customized error message [1 Update]
• Changing app from Rails 3 RC to final [1 Update]
• Multipe Combo box Query System [1 Update]

 Topic: design decision

ssmithstone <stephen.smithstone@gmail.com> Sep 27 05:29AM -0700 ^

 
Trying to make my controllers as skinny as possible , so come across a
design issue if I want to send out an email when a model is created
would I put this functionality on the after_create method or inside of
the controller after the #save method


 

Ar Chron <lists@ruby-forum.com> Sep 27 03:03PM +0200 ^

 
If I understand the requirement, then the creation of an e-mail is the
business of the model.
 
Controller should be deciding "After creation of model X, what view does
the user see? To the index view, the show view of the model just
created, or back to the view the user was at before creating the model?"
 
--
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 Topic: STI, xml/xslt, or ? for many custom forms/templates

AppleII717 <salex@mac.com> Sep 27 06:00AM -0700 ^

 
I'm considering porting an application to RoR. The application is
basically a "Order Entry" type system for the Interior Designer
vertical market. The existing application has a table with over 400
column! (not my design!). The majority of these columns are
measurements and descriptions for a certain types of product
categories (e.g., "Draperies","Sheer Draperies",
"Upholstery","Pillows","Lampshades", etc)
 
Each one of these categories (25+) has a custom form that display the
measurement attributes for that category. To make things worse,
there's a lot of javascript that enables/disables/shows/hides areas/
fields. There is some sharing of attributes (width, height, length,
size, for example). I can cut down the javascript by creating more
categories - for instance there are 3 types of "Sheer Draperies".
 
I alway though that these "Category Details" didn't need to be stored
individually in a record, but serialized in a "Details" fields. Now
the basic question is what would be the best approach?
 
I've never done xml/xslt type forms and don't know how difficult that
would be.
 
I've experimented with what could be considered "Tableless STI" and it
works, but with a few gotcha's. For instance:
 
class Detail < ActiveRecord::Base
def self.columns
@columns ||= [];
end
... rest of tableless stuff
#common attributes
column :type, :string
column :category, :string
column :workroom_material_reference, :text
column :description, :string
....
end
 
 
class Carpet < Detail
column :style, :string
column :quanity, :integer
column :yards, :float
end
 
The tableless approach would not allow me to create a new Carpet
without first doing Detail.new. There were other problems that I
hacked around, like defining def self.new_category(category) that
creates new ActiveRecord objects for both the basic attributes and the
category attributes. Maybe if I used a real table, some of those
problems would go away.
 
That approach is livable, but was wondering if I am totally missing a
better approach?
 
Anyway, I know I am still going to have a couple hundred date elements
to deal with and a bunch of partials.
 
Anyone want to point me in a different direction?
 
Steve Alex


 

 Topic: problem in using xsendfile apche+mongrel

Amit Tomar <lists@ruby-forum.com> Sep 27 10:00AM +0200 ^

 
Hii All, i loaded mod_xsendfile.so in apche , i added few line in
httpd.conf files
 
LoadModule xsendfile_module modules/mod_xsendfile.so
 
XSendFile on
 
XSendFileAllowAbove on
 
<VirtualHost * localhost:80>
ServerName src
 
DocumentRoot C:/InstantRails-2.0-win/rails_apps/src/public/
 
ProxyPass / http://localhost:3000/
 
ProxyPassReverse / http://localhost:3000/
 
</VirtualHost >
 
now in my rails application i have a streams controller and inside
streams controller i have a function named download ,code for code
download is below
 
def download
 
@stream = Stream.find(params[:id])
 
filename = "#{@stream.location}"
 
response.headers['Content-Type'] = "application/force-download"
 
response.headers['Content-Disposition'] = "attachment;
filename=\"#{File.basename(filename)}\""
 
response.headers["X-Sendfile"] = @stream.location
 
response.headers['Content-length'] = File.size(filename)
 
render :nothing => true
 
end
 
Problem is my rails application still handling this request but i would
like apache to handle this request ,can anyone tell me how i configure
apche to handle this request??
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Frederick Cheung <frederick.cheung@gmail.com> Sep 27 03:34AM -0700 ^

 

> Problem is my rails application still handling this request but i would
> like apache to handle this request ,can anyone tell me how i configure
> apche to handle this request??
 
So what happens when you hit that controller ? (and did you notice
that rails' send_file method has an x_sendfile option)
 
Fred


 

Amit Tomar <lists@ruby-forum.com> Sep 27 01:28PM +0200 ^

 
Frederick Cheung wrote:
 
> So what happens when you hit that controller ? (and did you notice
> that rails' send_file method has an x_sendfile option)
 
> Fred
 
Fred thanks for responding
Actully when i downloding files,mongrel rendering things,
 
Processing StreamsController#download (for 127.0.0.1 at 2010-09-27
16:50:47) [GET]
Parameters: {"id"=>"6655"}
?[4;36;1mSQL (0.0ms)?[0m ?[0;1mSET NAMES 'utf8'?[0m
?[4;35;1mSQL (0.0ms)?[0m ?[0mSET SQL_AUTO_IS_NULL=0?[0m
?[4;36;1mStream Columns (0.0ms)?[0m ?[0;1mSHOW FIELDS FROM
`streams`?[0m
?[4;35;1mStream Load (0.0ms)?[0m ?[0mSELECT * FROM `streams` WHERE
(`streams`.`id` = 6655) ?[0
Completed in 78ms (View: 0, DB: 0) | 200 OK
[http://src/streams/download/6655]
 
It is when i am trying to download 2.2GB of file ,file is downloaded
completely,but my worry is why mongrel is rendering things if apache is
handling download
--
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Frederick Cheung <frederick.cheung@gmail.com> Sep 27 05:29AM -0700 ^

 

> It is when i am trying to download 2.2GB of file ,file is downloaded
> completely,but my worry is why mongrel is rendering things if apache is
> handling download
 
That looks entirely normal to me - your rails code does need to be
invoked at some point in order for it to tell apache which file to
send.
 
Fred


 

Amit Tomar <lists@ruby-forum.com> Sep 27 02:36PM +0200 ^

 
Frederick Cheung wrote:
> invoked at some point in order for it to tell apache which file to
> send.
 
> Fred
 
But Fred lot of experts are saying ,mongerl doesn't render anything
while apche handle the request and one more thing how do i make sure
apache is handling is request??
--
Posted via http://www.ruby-forum.com/.


 

Michael Schuerig <michael@schuerig.de> Sep 27 02:52PM +0200 ^

 
On Monday 27 September 2010, Amit Tomar wrote:
 
> But Fred lot of experts are saying ,mongerl doesn't render anything
> while apche handle the request and one more thing how do i make sure
> apache is handling is request??
 
Amir, I'm not sure, but you might be misunderstanding what xsendfile is
for and how it works. This mechanism is not intended to serve "ordinary"
static files located in the public directory of an application. Rather,
it is a way for your controller to hand off serving a file to Apache
instead of doing it from within Rails.
 
So, your controller *has* to be involved. It's the job of the controller
action to decide which file to return in the response and then call
send_file with that file as a parameter. In the production environment,
this has the effect that the Rails process does not respond with the
file itself. Instead, Rails sets a special header which in turn is
picked up by Apache (or nginx, lighttpd) and interpreted in such a way
that it now serves the named file.
 
Michael
 
--
Michael Schuerig
mailto:michael@schuerig.de
http://www.schuerig.de/michael/


 

 Topic: Rails 3 - Creating a comment and then returning the Partial with JUST the new comment

Sunny Ezror <lists@ruby-forum.com> Sep 27 11:10AM +0200 ^

 
Have you tried passing in locals for the partial?
 
Not sure how Rails 3 does it, but Rails 2 its
 
<%=escape_javascript(render :partial =>"comments/comment", :locals =>
{:comment => @comment))%>
 
-sunny
http://ezror.com
--
Posted via http://www.ruby-forum.com/.


 

radhames brito <rbritom@gmail.com> Sep 27 08:45AM -0400 ^

 
@sunny @comment does not exists inside the create action, and he needs to
iterate over a collection , @comments
 
 
<%=escape_javascript(render :partial =>"comments/comment", :locals =>
{:comments =>fill the comments collection...))%>
 
 
or
 
 
@comment = lots of stuff going on here but it works...
@comments = fill the comments collection..
if @comment.save
flash[:notice] = "Successfully created comment."
respond_to do |format|
format.js
end
end
 
then
 
<%=escape_javascript(render :partial =>"comments/comment", :locals =>
{:comments => @comments))%>
 
 
@comments does not exists inside the response from create.js.erb so you have
to build it there or in the controller's create action before the respond_to
block
 
 
you can check my example
 
http://github.com/rbritom/Simple_polymorphic_nested_comments


 

 Topic: Rails 3 + jQuery ; How to show error messages

mrpink <sonke@webperator.de> Sep 27 05:44AM -0700 ^

 
Hi guys,
 
can anyone explain how to show error_messages_on (like back in Rails
2 , without Ajax) fields that didnt' pass the validation the jquery
way.
 
I googled for about 2 hours now and found nothing. Jquery works fine
and adds the content to my table, but im totally stuck with the whole
error/validation thing.
 
My form looks like this:
 
<%= form_for Translation.new , :remote => true do |f| %>
<table>
<tr>
<td>
<%= f.label :locale %><br />
<%= f.text_field :locale %>
 
</td>
<td>
<%= f.label :key %><br />
<%= f.text_field :key %>
</td>
</tr>
<tr>
<td>
<%= f.label :value %><br />
<%= f.text_area :value , :rows => 3%>
</td>
<td>
<%= f.label :interpolations %><br />
<%= f.text_area :interpolations, :rows => 3 %>
</td>
</tr>
<tr>
<td>
<%= f.label :is_proc %><br />
<%= f.check_box :is_proc %>
</td>
<td></td>
</tr>
</table>
<p><%= f.submit t('translation.create') %></p>
<% end %>
 
Create action like this:
def create
if @translation.save
flash[:notice] = "Successfully created translation."
respond_to do |format|
format.html { redirect_to @translation }
format.js
end
else
respond_to do |format|
format.html { render :action => 'new'}
# show what went wrong with jquery
end
end
end
 
and create.js.erb
/* Insert a notice between the last comment and the comment form */
$("#translation-notice").html('<div class="flash notice"><%=
escape_javascript(flash.delete(:notice)) %></div>');
 
/* Add the new comment to the bottom of the comments list */
$("#translations").prepend("<%=
escape_javascript(render(@translation)) %>");
 
/* Highlight the new comment */
$("#translation-<%= @translation.id %>").effect("highlight", {},
3000);
 
/* Reset the comment form */
$("#new_translation")[0].reset();
 
Adding validated data works but please give me hint with error
validation thing.
 
thanks


 

 Topic: Question about securing videos

egervari <ken.egervari@gmail.com> Sep 26 02:43PM -0700 ^

 
Assuming you want to stream some flv videos, what is the best way to
secure them via authentication while also embedding them in some kind
of web flash player?


 

Sunny Ezror <lists@ruby-forum.com> Sep 27 11:22AM +0200 ^

 
I'm having the same trouble with securing my videos for my latest app. A
simple before_filter can stop the user from accessing the page, but once
the video streams via a web player, the user can easily steal it.
 
Only solution I can think of is to use amazon s3's url expiration, but
that gets overly complicated.
 
-sunny
http://ezror.com
--
Posted via http://www.ruby-forum.com/.


 

Walter Lee Davis <waltd@wdstudio.com> Sep 27 08:23AM -0400 ^

 
Here's a good walk-through explaining some solutions to this problem.
Basically, you create a view that streams the file to the visitor with
send_file from a protected location -- not the usual public/system
space enjoyed by a normal Paperclip install.
 
http://everydayrails.com/2010/07/08/authenticated-attachments-paperclip-rails.html
 
Walter
 
On Sep 27, 2010, at 5:22 AM, Sunny Ezror wrote:
 


 

 Topic: rails3 validate email format

Ugis Ozols <ugis.ozolss@gmail.com> Sep 27 02:01AM -0700 ^

 
I'm using this:
 
:format => { :with => /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i }
 


 

Sunny Ezror <lists@ruby-forum.com> Sep 27 11:19AM +0200 ^

 
I use whatever that comes with restful_authentication scaffold generator
and for the most part it works fine for me:
/^[-a-z0-9_+\.]+\@([-a-z0-9]+\.)+[a-z0-9]{2,4}$/i
 
If you want to learn more about this or more control over it, I suggest
you read http://www.regular-expressions.info/email.html
 
-sunny
http://ezror.com
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"Felix Schäfer" <schaefer@cypres-it.com> Sep 27 11:51AM +0200 ^

 
Am 26.09.2010 um 18:54 schrieb Nadal:
 
> I am working on a rails3 project. Is there a tool to validate the
> format of email address. It does not have to be fancy regex. Just a
> few simple validations. However I don't want to reinvent the wheel?
 
Using a regex to validate an email format is in most cases a bad idea, the 2 proposed regexes won't for example recognize quoted local parts, which are valid (e.g. "foo@bar"@rails.info is a valid address). There's a validate_email_format_of plugin on github[1] which works fine on rails2, I think there is a branch/fork for rails3 somewhere too. Another method would be to just drop an EmailValidator into your lib so that you can reuse it at other places in your rails app, have a look at [2] (yes, it still is a regex and only matches what the RFC refers to as "addr-spec" as opposed to a "full" address, but a not-so-bad one).
 
Anyway, I'm a little surprised that rails3 having gone from TMail to Mail hasn't added a validator that would re-use the one already present in Mail…
 
Regards,
 
Felix
 
 
[1] http://github.com/alexdunae/validates_email_format_of
[2] http://lindsaar.net/2010/1/31/validates_rails_3_awesome_is_true


 

Sunny Ezror <lists@ruby-forum.com> Sep 27 12:57PM +0200 ^

 
Felix, I believe it does. In fact I did a quick check of both .info and
.me and they worked fine.
 
-sunny
http://ezror.com
 
Felix Schäfer wrote:
 
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"Felix Schäfer" <schaefer@cypres-it.com> Sep 27 01:07PM +0200 ^

 
Am 27.09.2010 um 12:57 schrieb Sunny Ezror:
 
> Felix, I believe it does. In fact I did a quick check of both .info and
> .me and they worked fine.
 
The point being the localpart "foo@bar" (and yes, the quotes are part of the localpart) in "foo@bar"@rails.info, not the TLD.
 
Oh, and you should use \A and \z (string delimiters) over ^ and $ (line delimiters), as your regex will also validate strings of the form: foo@bar.com\nSome-funky-DB-buster .
 
Best,
 
Felix


 

Sunny Ezror <lists@ruby-forum.com> Sep 27 01:13PM +0200 ^

 
Ah yes you're right about "foo@bar"@rails.info
 
-sunny
http://ezror.com
 
Felix Schäfer wrote:
 
--
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 Topic: Freelancers: small site implementation

Didde Brockman <didde@illianced.com> Sep 27 12:56PM +0200 ^

 
Hi everyone,
 
We're looking for an independent, driven and capable freelancer willing to help implement a small site using RoR. A CMS is required and among the candidates we like Typus the most, but can be flexible in this matter. You will be provided with complete front-end code (XHTML and CSS) as well as designs outlining the site's wireframe.
 
Contact me directly if you think this might be interesting! We're based in Sweden, but welcome anyone from US/EU to get in touch for further details and planning.
 
Many thanks.
 
 
/didde
 
--
Didde Brockman, Illianced
http://www.illianced.com/


 

 Topic: rails3 customized error message

Sunny Ezror <lists@ruby-forum.com> Sep 27 11:31AM +0200 ^

 
Try this:
 
http://stackoverflow.com/questions/3755128/rails-3-custom-error-message-in-validation
 
I haven't played around with it, but object.errors[attribute] <<
error_message should probably be changed to just error_message.
 
Let me know how it goes.
 
-sunny
http://ezror.com
--
Posted via http://www.ruby-forum.com/.


 

 Topic: Changing app from Rails 3 RC to final

Sunny Ezror <lists@ruby-forum.com> Sep 27 11:15AM +0200 ^

 
If you've the newer Rails version already installed, its really as
simple as that. If not install that and you're all set to go.
 
-sunny
http://ezror.com
--
Posted via http://www.ruby-forum.com/.


 

 Topic: Multipe Combo box Query System

PalaniKannan K <kpalanikannan@gmail.com> Sep 27 10:05AM +0200 ^

 
Dear Jeff,
 
Thank you very much... Excellent.
 
 
--
With Regards
Palani Kannan. K


 

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