similar to: nil error?

I have some properties that I want setable externally, but readable only internally. I''ve played around with attr_writer (and attr_reader separately) but can''t figure out how to get either to work. I can do what I want using attr_accessor, or just straight out defining the prop setter method. Anybody know how to use attr_writer or attr_reader with a model? You da man, Joe

Dear all, I have carried out a pairwise comparison study that I want to analyze using the BradleyTerry package to establish a rank order of my stimuli. However, BT does not handle ties between stimuli, so I need to find those in my data before I can use that model. The code below goes from the format of my result file(s) to a data frame suitable for BT, but as you can see, there are some ties. I

Greetings, I have a problem with attr_accessor and create seemingly being at odds with each other in my environment. Here is the setup: A simple class representing a US State (say, Maine for example): class State < ActiveRecord::Base attr_accessor(:name, :code) end In an IRB session, I type the following and receive the response included below: >>

Have anybody expirience with Ippon Smart Winner 750/1000/1500/2000/3000 with serial interface ? I have tryed megatec and blazer_ser drivers with no success: [IPPON] driver = megatec port = /dev/ttyd0 desc = "IPPON smart winner 1500VA" model = "Smart Winner 750/1000/1500/2000/3000" # ./megatec -a IPPON -DDD Network UPS Tools - Megatec

hi every body. i am try to do example of agil books.dynamically updating list of chapter 18. 1)this is my code for controller---- class ListnoajaxController < ApplicationController def index @items = Item.find_recent end def add_item item = Item.new(params[:item_body]) render(:partial => "item", :object => item) end def item end end 2)the code for item class in app/model class

hi, i''ve been cracking my head on this one for a while and would be humbly grateful for any pointers i''m working through Agile Web Devopment w Rails and, in the depot example have created the cart class for session handling, but am getting the following error, which suggests the @items variable is not being populated with any data from LineItem NoMethodError (You have a

When I add an item to the shopping cart, I get an error: undefined local variable or method `cart_item'' for #<#<Class:0x3715a78>:0x3715a48> Session info says the cart being updated properly. I''m just not able to output two variables: <%= cart_item.quantity %> &times; <%= h(cart_item.title) %> I did some research, and I can grasp that local

Hi all, Since I didn''t get any takers on the win32-ole rewrite I thought I''d take a stab at starting it. Here''s what I''ve got so far (along with some extra constants in Windows::COM only in CVS), but the call to CoCreateInstance() isn''t working. I''m not sure if I''m dealing with the IDispatch interface properly: # win32/ole.rb require

http://www.sdmagazine.com/jolts/2006index.html BOOKS TECHNICAL Jolt Winner: Agile Web Development with Rails by Dave Thomas, David Hansson, Leon Breedt and Mike Clark (Pragmatic Bookshelf) Productivity Winners: ? Framework Design Guidelines: Conventions, Idioms, and Patterns for Reusable .NET Libraries by Krzysztof Cwalina and Brad Abrams (Addison-Wesley) ? Practical Common Lisp by Peter

I''m doing the depot example in the Agle Web development book. I''m getting this error: "undefined method `product'' for #<BigDecimal:331ce70,''0.21E1'',8(8)> " "Extracted source (around line #9): 8: for item in @items 9: product = item.product 10: -%> 11: <tr> 12: <td><%= item.product%></td>"

I bought the second edition of the ruby on rails, it seems to work fine now, did some adjustments to the code. But now I get a second error and I want to learn to understand to fix them myself. So here is the error. ArgumentError in StoreController#add_to_cart wrong number of arguments (1 for 0) #{RAILS_ROOT}/app/models/cart.rb:15:in `initialize'' #{RAILS_ROOT}/app/models/cart.rb:15:in

Hi, I have a class Match that looks like this (simplified) class Match < ActiveRecord::Base belongs_to :opp1, :class_name => "Player", :foreign_key => "opp1_id" belongs_to :opp2, :class_name => "Player", :foreign_key => "opp2_id" belongs_to :winner, :class_name => "Player", :foreign_key => "winner_id" end Can I

I''m trying to use composed_of within my model. I have a field in my database named ''card1'', which is simply a string. I have this in my model class Player < ActiveRecord::Base composed_of :card1, :class_name => ''Card'' end class Card attr_reader :value, :suit def initialize(s) @value = s[0].chr @suit = s[1].chr end end The

Just a quick note that I had to make the following change after installing 1.0.2 as rails plugins to get the resource generator working: Index: rspec_scaffold_generator.rb =================================================================== --- rspec_scaffold_generator.rb (revision 2022) +++ rspec_scaffold_generator.rb (working copy) @@ -1,4 +1,4 @@ -class RspecResourceGenerator <

i''m very new to the rails scene and am seeing lines of code like attr_reader, attr_writer, attr_accessor, etc... and have no idea what they do. reading the section in the book i''m reading that explains the previous block of code says nothing about it really. -- Posted via http://www.ruby-forum.com/.

The original: http://pastie.textmate.org/private/lqvrlyyvkv2kbugoxtiz6w Send your submissions to me by email or on #merb. I''ll blog it, and pick a winner. The winner does not mean it makes it into Merb, just means I personally like it best. But it might make it into Merb. # Scenario: # You have a simple application that lists all the monkeys at the zoo. # Every monkey has a

I am trying to use gee() to calculate the robust standard errors for a logit model. My dataset (zol) has 195019 observations; winner, racebl, raceas, racehi are all binary variables. ID is saved as a vector of length 195019 with alternating 0's and 1's. I get the following error message. I also tried the same command with corstr set to "independence" and got the same

On May 8, 2013, at 10:50 AM, Chandler Carruth <chandlerc at google.com> wrote: > > What are the SHA-3 variants that you think would suite these needs ? > > I want to look at the implementation complexity. The winner (and the official SHA3 algorithm), BMW and Skein are all worth looking at. If your primary criterion is through-put on large, desktop-class CPUs, Skein is likely

On Wed, May 8, 2013 at 9:13 PM, Owen Anderson <resistor at mac.com> wrote: > On May 8, 2013, at 10:50 AM, Chandler Carruth <chandlerc at google.com> > wrote: > > >> >>> What are the SHA-3 variants that you think would suite these needs ? >> >> > I want to look at the implementation complexity. The winner (and the > official SHA3 algorithm),

I used generate/scaffold to create simple CRUD screen that works perfectly with Webrick. I wanted to attempt to run the same ROR app on Apache. I followed the instructions found at http://wiki.rubyonrails.org/rails/pages/Fast+CGI+and+Apache2+for+Windows+XP with the alternate ending found at http://wiki.rubyonrails.org/rails/pages/Fast+CGI+and+Apache2+for+Windows+wit hout+VirtualHosts. I have