similar to: How do you create a tree strucutre with ActiveRecord

I''m having a silly little problem with migrations.  All I''m trying to do is to add an SSN column to my Employees table.  I generated a migration which looks like: class AddSsn < ActiveRecord::Migration def self.up     add_column :employees, :ssn, :string end def self.down     remove_column :employees, :ssn   end end When I run this, however, I get: >rake

A client of mine has a ton of data stored in Excel spreadsheets. I''m building a web application for her (backed by a real db of course) and want to import all that data. Is there a library available to read data from Excel? Is there an easy way to upload the spreadsheets and then read the data? Thanks, Ken Kousen -- Kenneth A. Kousen, Ph.D. President Kousen IT, Inc.

Hi all, I was a client site today on another project and we started talking about RoR. I wanted to show it in action, so I downloaded the one-click Ruby installer for Windows and then tried to do "gem install Rails -include-dependencies". After a time-out period I received the following error: ERROR: While executing gem.(Gem::RemoteSourceException) Error fetching remote gem

For those haven''t seen it yet, Patrick Peak has an interesting article at the Server Side (www.theserverside.com) discussing the differences between the Hibernate (www.hibernate.org) peristence framework and ActiveRecord.  The article can be found here: http://www.theserverside.com/articles/article.tss?l=RailsHibernate .  Patrick Peak is the author of _Hibernate Quickly_ (Manning), which

Hi all, The Rails book talks about running Rails under Apache, but is there a (relatively) easy way to deploy it to either Tomcat or JBoss? Is the CGI servlet the only option? Thanks, Ken -- Kenneth A. Kousen, Ph.D. President Kousen IT, Inc. <http://www.kousenit.com> http://www.kousenit.com <mailto:ken.kousen@kousenit.com> ken.kousen@kousenit.com

Here''s something that caused me a couple of hours of head-scratching today: Apparently, if your model doesn''t derive from ActiveRecord, it is NOT reloaded for each operation in the development environment. I was working with something that uses a single model per session, and stores its data in the session. I kept wondering why I didn''t see my changes. Finally, I

Hi -- My book "Ruby for Rails" is now being released one chapter at a time through the Manning Early Access Program, with the whole book due to appear on May 1. If you''re interested, see http://www.manning.com/books/black (I guess I could have just sent my sig with no body, but anyway :-) David -- David A. Black (dblack@wobblini.net) Ruby Power and Light

How can I link to a CSS file in one of my view files? -- Posted via http://www.ruby-forum.com/.

Hey Folks, Now that all the fun and games of learning Rails has almost sunk in it''s time to build something useful. I am tasked with building a system to control and search our large (and I mean large 1.5 million + and growing) photograph collection. I have been building databases for years and after thinking about the situation we decided that trying to store the

Hi all, My code looks like the following: inname = read.csv("ID_error_checker.csv", as.is=TRUE) outname = read.csv("output.csv", as.is=TRUE) #My algorithm is the following: #for line in inname #if first string up to whitespace in row in inname$name = first string up to whitespace in row + 1 in inname$name #AND ID in inname$ID for the top row NOT EQUAL ID in inname$ID for the

Hi, I''m interested in using a currency conversion web service in my rails app. Does anyone have a free service that they use and like? I found this one http://www.webservicex.net/WS/WSDetails.aspx?CATID=2&WSID=10 I''ve tried to make a simple, plain Ruby script to connect to this and get a conversion rate without success. How do I integrate a webservice into my rails app? I

ANNOUNCING AGILE WEB DEVELOPMENT WITH RAILS, SECOND EDITION =========================================================== http://www.pragmaticprogrammer.com/titles/rails2/ Rails has changed a lot since we announced the first edition of the book a year ago. DHH says that the 1.1 release "boasts more than 500 fixes, tweaks, and features from more than 100 contributors." Who are we to

>From what I can tell by reading forum posts etc., this is not a trivial issue. An answer in 2008 indicated some directions, but I'm curious whether any developments have been made since then. In my data set I have 182 observations with a binomial response, a 2-level explanatory factor, and x and y coordinates. By visually inspecting the spatial distribution of standardized residual error

I hope i am posting this to the right list. Specs: FreeBSD 4.x Wine 20011108 -- FreeBSD ports version Me == Newbie I am trying to configure wine manually because the package i recieved does not include winesetup. I configured the drives to suit my setup and left the rest as the defaults. When i try to start wine with "wine program.exe" i get this error:

Hello, I''ve been trying for hours to parse an XML using Hpricot. Usually it''s not a problem. Here''s my simple code: #This works and outputs the proper xml data @url1 = ''http://www.sportingnews.com/stories/sportingnews/MLB/rss.xml'' @page1 = Hpricot(open(@url1)) <%= @page 1 %> #This does not work, and I''m scratching my head @url1 =

In the interests of full disclosure, here's the glossy press release (with html as well ! :-). Jeremy. --------------------------------------------------------------------- Samba 2.2.0 - Powering the next generation of Network Attached -------------------------------------------------------------- Storage. -------- 17

I'm getting a little closer and understanding how the logs, etc work. I can log onto a Samba share, can read and write to my home directory, but I'm concerned about trying to get the file share Staff to work - want it to be read and write to the Group named Staff. I have set up the group and added myself to the group If I do a smbldap-groupshow Staff - I get sudo smbldap-groupshow

Dear R users, How to find all single minima within each next part of analyzed vector (table) Select all minima (mass_value=min & mass_value<2) (many) in vector(table), BUT first put mask on table in order to select within one window mask (5 elements) only one local minimum, and next to search within the next time window mask the second minimum (only one local along second mask)

I''m really close to solving this that I can smell it. In a nutshell I''m trying to create this: http://www.baseball-reference.com/friv/link_players.cgi I have an app that has a database of baseball players. I''m trying to create a feature where you can copy and paste your blog text, the feature will scan the text and return the text with the proper html links of my app

Hello, I'm working on setting up a corporate print server with samba 3.2.0-2.17 on a Fedora 9 install. I've been able to get the services up and running and added several printers via the cups interface, also been able to upload the windows drivers. This all works well, printing also works well. The problem that I am running into is that the old print jobs seem to be getting stored