similar to: Determine if attributes changed?

Table A has many table B''s. So the foreign key in table B is a_id. I want to select a single record from table A that does not have any table B''s. The problem is that the foreign key is in table B. Is there a simple way to do this with the find method in active record? Or do I need to select all and loop through them all and check until I find one? Thanks for your

I''m sorry to be asking trivial questions, but I''m new to RoR and am hooked :), so I''m very impatient to get things up and running. given two related tables, "pcs" and "venues" (venues have many PC''s and each PC belongs to one venue only) I can use a select() to present venue names in the "new PC" form along with other PC details to

The documentation states as an example: select("post", "person_id", Person.find_all.collect {|p| [ p.name, p.id ] }, { :include_blank => true }) could become: <select name="post[person_id]"> <option></option> <option value="1" selected="selected">David</option> <option

Quick question - if i want to separate a long string of text, separated by single carriage returns, into an array of paragraphs, I can use the following code: paragraphs = article.content.split("\n") The "\n" means a carriage return, as far as I can tell. If I wanted to take text, that had been written using the more common double carriage returns, into an array of

Hi, I have a page containing 3 views (2 are partials). One of the partials needs to have a button that will clear a table called "messages" in the database. I can put a button like this "<%= button_to "Clear Messages", :action => ''clear_messages'' %>" and have the controller do "Message.delete_all". But the problem is that the

Hi. I need to use functions INET_ATON, INET_NTOA for IP address retrieving. Is it possible to make this transparently (without custom SQL for saving, updating and retrieving)?

Hello, I would like to know is there is a way to avoid poluting the views with tons of <% %> ? Like this <%= start_form_tag() %> <%= text_field_tag(''category[title]'', category.title, {:size => 20, :maxlength => 128}) %> <% if not category.parent_id.nil? %> <%= select("category", "parent_id", Category.find(:all,

i ran into an error today when dealing with the method next_week and daylight savings time... >> Time.local( 2006,10,23 ).next_week => Tue Oct 24 00:00:00 EDT 2006 Any one know if this is a know issue or should a ticket be created for this issue? thanks for the help mark -- Mark Van Holstyn mvette13@gmail.com http://lotswholetime.com -------------- next part -------------- An HTML

I have a complex graph of ActiveRecord entities that I want to load with one big honkin'' join query to avoid ripple loading. It''s for a report. However :include doesn''t get me all the way there because I want to load parents of parents (or children of children). I don''t mind doing the SQL by hand but I''m not quite sure what to do to get the result

I have table "decks" with three fields: "id", "created_at" and "cards" which is a 264-character string field. I have modified the model with a constructor, as follows: class Deck < ActiveRecord::Base attr_reader :cards def initialize @cards = "12345" end end If I call Deck.new from my controller, I get no errors and an object with the

I need to know what controller and action the user is currently in to do various things in my layouts/application.rhtml file. Isn''t there is a better way than: <% if params[:controller] == "whatever" && params[:action] == "whatever" %>some html<% end %> I know in the controllers you can just use controller_name, but that is not provided

Hi everyone, I''ve encountered a HUGE problem, which may not be RoR-oriented, but there might be a workaround somehow. See, at this moment, I''m unable to send AJAX requests back and forth when the information contains an ampersand (''&''). In essence, request is never completed. The odd thing is that it only happens with Firefox (IE and Opera works fine).

Hello, The following view: <%= start_form_tag %> Enter term to find <p> <%= text_field_tag :name, params[:name] %> </p> <%= link_to "Find", { :action => ''find_term''} %> <%= end_form_tag %> does not appear to pass back the value of :name to the action: def find_term term =

I''m using this: <% words = article.content.split(/ /) %> <%= words[0..20] %> to (ostensibly) split a paragraph into component words, with spaces in between, then print to html only the first 20 items, words and spaces. I got this (split(/ /)) from the online pickaxe book at http://rubycentral.com/book/ref_c_string.html#String.split . The problem is, the resulting array

Does anyone know if it is possible to perform an ActiveRecord find by passing in an array? I would like to be able to do the following: MyModel.find(:all, :conditions => ["user_id in (?)", users]) The problem I run into is that the returned SQL contains the to_s() output of the User object, not the ids of those users. Is it possible to change this behavior? I attempted to

If there is an exception raised in my worker I rescue it and throw it into the log. This is decent, but it would really help to find out more information. Like the line number, the stack trace, etc. Is this possible? Thanks for your help. Thank You, Ben Johnson E: bjohnson at contuitive.com -------------- next part -------------- An HTML attachment was scrubbed... URL:

I know that isn''t supposed to be the case, and it usually isn''t, but today, I''ve run across a situation where rendering the same partial through RJS is taking about 5 times longer than rendering the partial in the RHTML. I have in my main RHTML <tbody id="account_transactions"> <%= render :partial =>

Since MiddleMan is an uninitialized constant in a worker how do you create new workers inside a worker? Thank You, Ben Johnson E: bjohnson at contuitive.com O: 800-341-6826 M: 817-229-4258 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://rubyforge.org/pipermail/backgroundrb-devel/attachments/20060731/75a77fa6/attachment-0001.html

I am pretty confident that mailers do not work in backgroundrb. Can anyone confirm this? Because when I try to do Notifier.deliver_some_method I get an error saying it cant find the templates for my email. The funny thing is that when I run script/ runner Notifier.deliver_some_method it works just fine. Any ideas? Thank You, Ben Johnson E: bjohnson at contuitive.com O: 800-341-6826 M:

I have workers that need to be created when I run rake backgroundrb:start. Where do I put this code? Thanks for your help. Thank You, Ben Johnson E: bjohnson at contuitive.com -------------- next part -------------- An HTML attachment was scrubbed... URL: http://rubyforge.org/pipermail/backgroundrb-devel/attachments/20060731/d201c052/attachment.html