similar to: inheritance with rails.

I have problems on a simple design problem. I have many companies. Each company have one or more commercial activity. Activities types are: ecommerce, local unit, television, automatic vending machines, and so on. Company may have one or more ecommerce activity or one or more local unit activity, one ormore vending machines, etc. How can I model this scenario? Company has_many ecommerce has_many

I want to iterate ?nodes? and ?leafs? for a yaml document: thufir@ARRAKIS:~/projects/rss$ thufir@ARRAKIS:~/projects/rss$ ruby user.rb user.rb:6: undefined method `[]'' for nil:NilClass (NoMethodError) from user.rb:5:in `each_key'' from user.rb:5 thufir@ARRAKIS:~/projects/rss$ thufir@ARRAKIS:~/projects/rss$ ruby user2.rb user2.rb:5: undefined method `[]'' for

Hi, I have a Question model where the answer to the question can have multiple db type (integer, string, boolean, ...). I would like to know if you have a better solution than this one: Question: question:string answer_type:string AnsweredQuestion: question_id:integer answer:text answer_type:string Ex: AnsweredQuestion.create(:question => 1, :answer => ''5'',

Hi Newbie question: I have a set of data frames that I want to do the same calculations on each. I've found out that I can put them in a list and loop through the list to do the calculation, but not put the results back into each data.frame.. For example three data frames cats, dogs, birds where >cats name eats_kg 1 bob 3 2 garfield 4 3 chuck 6 and dogs and birds are similar but not

hi - i have strings that i need to extract keywords from. the string might have html tags, urls, etc. i need to extract the keywords from the string. i imagine i''m not the first guy to have to tackle this problem. is there a gem i can use or anyone have any ideas how to approach this? thanks, dino

I''m trying to implement acts_as_rateable to my Beast installation to give users the option to rate posts (like reddit). I chose acts_as_rateable as it supposedly easily allows reddit-type voting but I''m having some problems setting it up and the documentation seems outdated. (http://www.juixe.com/techknow/index.php/2006/07/05/acts-as-rateable-plugin/) So far, I''ve

I have a model that has two properties that both come from the same database table. Let''s say I have a "Lead" model. This Lead has both a contact "State" (as in Colorado, Arkansas, etc.) and a "Property State" where the house he''s looking to refinance is located. Both of these should obviously be objects of the type "state".

Hi, I hope this is not too trivial, but I've had this recurring problem and I think there is super easy solution, just not sure what it is. Please see short example below. ?I would like to get the frequency (counts) of all the variables in a single column (that is easy), but I would also like to return the value 0 for the absence of variables defined in another column. For example: animals

For example, c("dog.is.an.animal", "cat.is.an.animal", "rat.is.an.animal"). How can I identify the common prefix is ".is.an.animal" and delete it to give c("dog", "cat", "rat") ? Thanks _________________________________________________________________ [[alternative HTML version deleted]]

I am appealing to the general collective wisdom of this list in respect of a statistics (rather than R) question. This question comes to me from a friend who is a veterinary oncologist. In a study that she is writing up there were 73 cats who were treated with a drug called piroxicam. None of the cats were observed to be subject to vomiting prior to treatment; 12 of the cats were subject to

Hi, I want to automate somewhat the addition of created_by/updated_by fields on my models (i.e. to include username). What''s the best/recommended way to do this? Would it be to: a) Find out how to extend the ActiveRecord::Base itself (I haven''t extended a class before yet) b) Use a plugin type approach where you have to add a tag manually to each model file which then

Hi, I want to create variable names from within my code, but can't find any documentation for this. An example is probably the best way to illustrate. I am reading data in from a file, doing a bunch of stuff, and want to generate variables with my output. (I could make a "list of lists" and name all the elements, but I really want separate variables.) ################# #This is

I''ve read previous posts to the list stating how Rails lacks multiple key support for database tables, and how support is not planned. I''m OK with that, but I''m wondering if there''s an elegant way to do what I need, for my in-house customer relationship management tool: I have an ACTIVITIES table. That table is a collection of individual, unique activities

I''d like to organise my active records into modules but can''t get the associations to work. The doc says that associations within the same module should work. I''ve tried using the class_name option too but still doesn''t work. Can anyone help? For example module Mod1 class Animal < ActiveRecord::Base has_many :dogs, :class_name =>

Hi Given three vectors x <- c(fish=3, dogs=5, bats=2) y <- c(dogs=1, hogs=3) z <- c(bats=3, dogs=5) How do I create a multi-way table like the following? > out x y z bats 2 0 3 dogs 5 1 5 fish 3 0 0 hogs 0 3 0 ('out' is a matrix). See how the first line shows 'x' has 2 bats, 'y' has zero bats, and 'z' has 3 bats and so on for each

Hi, i try to understand how plugins work in detail. Often you see stuff like: class Post < ActiveRecord::Base   acts_as_commentable end I wonder what''s happen all there. What kind of language-feature is behind this call "acts_as_commentable" ? In my opinion you need some kind of extend or include to extend the functionality of a model. And exactly this is which i found

Hi, everyone, Just wondering if someone had come up with a good way to do fuzzy searches if you use MySQL as your database (we tried switching to PostgreSQL, but that ended up adding even more problems). Ferret sounds great, but reading through the discussion it looks like we need to solve the problem of write conflicts. I just wrote a post in ruby-talk about using KirbyBase maybe to solve

Hi there, I love the acts_as_* family that rails uses. I''ve also found I can create something similar by dropping the following code into my activerecord classes: class MyClass < ActiveRecord::Base class << self alias_method :count_with_unapproved, :count end def self.find(*args) options = extract_options_from_args!(args) if options[:conditions].nil? options[:conditions] =

In my daily development, I migrate back and forth between versions, and often do: rake load_fixtures... ... in order to populate my development database with fun data. Now, with any HABTM relationship, there are failures, as there is no way to say "which" fixtures to load first. Within an actual functional or unit test case, you could simply load them in the proper order, but

R-helpers, I have a vector of character strings in which I would like to replace each parenthetical phrase with a single space, " ". For example if I start with x, I would like to end up with y. x <- c("My toast=bog(keep=3 no=4) and eggs(er34)omit=32", "dogs have ears", "cats have tails (and ears, too!)") y <- c("My toast=bog and eggs