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Hello. I want to select an item from a select list and have that result in an ajax call that updates two sections on the page. Here is the code in the controller def create ... render :update do |page| page.replace_html ''list_items'', :partial => ''lists/list_items'' page.replace_html ''add_item'', :partial =>

Ok, I''m sure this has to be something stupid that I''m doing (or not doing), but I can''t seem to get things to order by the specified column. class List < ActiveRecord::Base has_many :list_items, :order => "orderby" The error I get back when trying to save the link is: Unknown column ''position'' in ''order clause'':

I want to build an application that lets me (the end user accessing a web page) design a simple list with columns and add records. E.g., if the end user says I want a table that has a list of songs, he can create a list (title, date, artist, label) and then make another list of, e.g., books on his bookshelf with the necessary columns (title, author, pub_date, shelf). The end user

I tried the instruction tutorial on http://maczealots.com/tutorials/ruby-on-rails/ and in the middle of trying to install fixrbconfig I got an error: usr/lib/ruby/1.8/powerpc-darwin8.0/ruby.h does not exist. This probably means you haven''t yet installed Xcode from the Tiger DVD. You won''t be able to compile Ruby extensions without it. Please install it then rerun this

so here is the deal. i''ve got three tables: lists, items, comments, and this is how they are laid out: lists table id title items table id list_id item comments table id list_id comment to give you some background. in order to get a list of all the lists i am making this call: SELECT lists.id, title, count(items.list_id) AS total_list_items FROM lists INNER JOIN

Dear R users, A co-worker and I are writing a function to facilitate graph plotting in R. The function makes use of a lot of lists in its defaults. However, we discovered that R does not necessarily preserve the defaults if we were to input them in the form of list() when initializing the function. For example, if you feed the function codes below into R: myfunction=function( list1=list

Hi, New Rails user here trying to create a basic todolist app in rails 3.2.6 and running into some foreign key issues. Here''s what I did... I generated scaffolds list title:string & task description:text listname:string Next, in order to link the listname for Tasks and the list titles in the Lists I generated a migration file which looks like this class AddListIdToTasks <

Hi, I have two objects: Contacts Lists I want to be able to add multiple contacts to multiple lists. I''ve created a linking table and a form that allows me to select the contacts using checkboxes, but I''m having some problems with the controller and model. I receive the following error message when I submit the form: Mysql::Error: Cannot add or update a child row: a

I everyone, i have a little problem with tklistbox,the " " character and Rcmdr. Please look at this code require(tcltk) tt<-tktoplevel() levels.list2 <-tklistbox(tt,selectmode="multiple",exportselection="FALSE", height=4, yscrollcommand=function(...)tkset(levels.list2.scroll,...))

I can''t see how to use variables so I am using console to test things out... clients table - a column named first_name My very brief console session... >> clients = Client.find_by_sql("select * from clients where first_name = FN") ActiveRecord::StatementInvalid: RuntimeError: ERROR C42703 Mcolumn "fn" does not exist Fparse_expr.c L1034

I''m new to RoR and I''m having a little problem that I can''t solve. My model is simple. I have Lists and ListItems. I have a view that loops through all the list items, and I put the HTML for the each list item row in a partial called _list_item.rhtml. This is the view, called show.rhtml <ul> <%= render(:partial => "list_item", :collection =>

Hi, Algorithm question: I have two sets of "intervals", where an interval is an ordered pair [a,b] of two numbers. Is there an efficient way in R to generate the intersection of two lists of same? For concreteness: I'm representing a set of intervals with a data.frame: > list1 = as.data.frame(list(open=c(1,5), close=c(2,10))) > list1 open close 1 1 2 2 5

Hi, I have 2 questions on list object:   1. Suppose I have a matrix like: dat <- matrix(1:9,3)   Now I want to replicate this entire matrix 3 times and put entire result in a list object. Means, if "res" is the resulting list then I should have:   res[[1]]=dat, res[[2]]=dat, res[[3]]=dat   How can I do that in the easilest manner?   2. Suppose I have 2 list objects: list1 <- list2

hi, i'm trying to figure out if there's any possibility to write a whole vector into a matrix or data.frame or something like that. i don't mean transormation. Here an example: [,1] [,2] [1,] "a" "d" [2,] "b" "e" [3,] "c" "f" where e.g. a is a<-c(0,1) vector of length 2, b a vector of length 4,... (i know that

Hi R users I was wondering on how to use lapply & co when the applied function has a conditional statement and the output is a 'growing' object. See example below: list1 <- list('A','B','C') list2 <- c() myfun <- function(x,list2) { one_elem <- x cat('one_elem= ', one_elem, '\n') random <- sample(1:2,1) show(random)

Hi, This has bugged me for a bit. First question is how to keep classes with rbind, and second question is how to properly return vecotrs instead of lists after turning an rbind of lists into a data.frame list1=list(a=2, b=as.Date("20090102", format="%Y%m%d")) list2=list(a=2, b=as.Date("20090102", format="%Y%m%d")) rbind(list1, list2) #this loses the

Hello, am I using 'setIs' in the correct way in the subsequent (artifical) example? Do I have to specify explicit 'setAs' for 'list' and 'vector' or should this work automatically, since "getClass("List1")" states an explicit coerce also for these classes. I'm working with R 2.0.0 Patched (2004-10-06) on windows 2000. Thanks for your

I am new to R, and I have been running into the following situation when I mistype a variable name in some code: > list1 <- list( a=1, b=2 ) > list2 <- list( a=1 ) > list2$b <- list1$c > list2 $a [1] 1 I would think at the point where I am trying to reference a field called "c" -- that does not exist -- in list1, there would be an error flagged. Instead, list1$c

R-helpers: Say I have two lists of arbitrary elements, e.g.: list1=list(c(1:3),"R is fun!",c(3:6)) list2=list(c(10:5),c(5:3),c(13,5),"I am so confused") I would like to produce a single new list that is composed of all combinations of the "top level" of list1 and list2, e.g.: listcombo=list(list(list1[[1]],list2[[1]]),list(list1[[1]],list2[[2]]

Hi, I am wondering whether we can apply 'cbind/rbind' on many **equivalent** list objects. For example please consider following: > list1 <- list2 <- vector("list", length=2); names(list1) <- names(list2) <- c("a", "b") > list1[[1]] <- matrix(1:25, 5) > list1[[2]] <- matrix(2:26, 5) > list2[[1]] <- 10:14 > list2[[2]] <-