similar to: HABTM vs. using has_many :through

So having just learned how to do has_many :through as opposed to HABTM, and then, being concerned that I wouldn''t get it to work, I started thinking about these two approaches. It seems to me that the _only_ problem that the HM:T (has_many :through) approach solves that HABTM doesn''t is the issue of the potential collision of id columns between your join table and one of

All, I''m building model objects for existing tables that I cannot modify. In AWDWR, Dave says "Note that our join table has no id column...The second reason for not including an id column in the join table is that AR automatically includes all columns from the join tables when accessing rows using it. If the join table included a column called id, its id would overwrite the id

I just took my HABTM and turned it into a :through since my join table has another "non-joiny" attribute. I went from this: has_many_and_belongs_to :jobs, :join_table => ''tablename'', :foreign_key => ''x'', :association_foreign_key => ''y'' to this: has_many :jobs, :through =>

All, Win XP SQL Server 2000 Rails 1.1.6 (AR 1.14.4) I have two objects (Job and Warning) in a HABTM relationship. Below are the pertinent sections of the model files and the schema for the join table. job.rb: class Job < ActiveRecord::Base has_and_belongs_to_many :warnings, :foreign_key => ''JobReferenceNumber'' set_table_name :JobData set_primary_key

All, I''m populating a view with checkboxes in a list. I want to be able to assign to my has_many relationship using the post values of these checkboxes. Essentially, I want to populate the relationship table which will create the correct join values in my model. Here is my check_box_tag code: <%= check_box_tag("@current_job[target_list_ids][]",

I''ve been bringing up a good basica framework for applications at work. To give decent security I''ve been implementing the Rails Recipie for Authorization of function calls modeled on the book''s implementation. (Changes for our environment were added..but are minor.) Since I initially let Rails create the join table between two data tables with a HABTM relationship....I

Ok, David says on page 241 that sometimes a many-to-many relation with attributes are better implemented as an actual model instead of using HABTM. Well, I''ve got that situation and I can''t figure it out. All of the examples in the book have HABTM examples between 2 different tables, but I want to have a HABTM relation on 1 table with itself. (e.g., if I have a table Things,

In AWDWR David says (pg 232), "When a Join Wants to Be a Model: While a many-to-many relation with attributes can often seem like the obvious choice, it?s often a mirage for a missing domain model. When it is, it can be advantageous to convert this relationship into a real model and decorate it with a richer set of behavior. This lets you accompany the data with methods. As an example,

I have two models that have a habtm relationship and it only seems to be working in one direction. The two models are "recipe" and "msn_lifestyles_feed" with a join table called "msn_lifestyles_feeds_recipes" the tables for msn_lifestyles_feed and msn_lifestyles_feeds_recipes are in the same database and the recipe table is in a completely different database. When

I have two model objects, Document and Images. Here are the relevant declarations: class Document < ActiveRecord::Base has_many :images class Image < ActiveRecord::Base belongs_to :document The database tables exist and foreign keys are set up correctly. In my controller, on an initial request, calling @document.images (nothing in it yet) is fine. However, after I attempt to

All, I did a scaffold for a model and I ended up with this code in list.rhtml: <% for column in TargetList.content_columns %> <td><%=h target_list.send(column.name) %></td> <% end %> Where is the "send" method and what does it do? I can''t find it on ActiveRecord::Base? I assume that it returns a value based on the column id but I

All, Thanks for any help in advance. I have what I think is a very straightforward partial template and I can''t figure out why a text_field call within it doesn''t work. Here is my calling template: lists.rhtml <div id="target_lists"> <%= render(:partial => "target_lists", :collection => @target_lists) %> </div> In the partial

All, I would like to test some secure pages that I''m developing in my WEBrick-based development environment. I''ve done some research and it appears that I need to create a new command that will start a HTTPS based WEBrick server. Is this correct? Also, it appears that the https.rb module is not included with the WEBrick bundled in Rails. So, I will need to go get that

All, I want to run automated unit tests as part of my build. I am building to my test environment. Upon successful completion of all of my unit tests, I would then like to load some data (using a fixture, I imagine) into my test database that will act as fresh "system test" data for my users to play with. What is the best way to "load the standard system test/user acceptance

All, I''ve run into a snag. I need to handle the display of elements on my page and I want to use my Javascript event handlers on page load. However, my BODY tag is trapped in my generic layout. I''m thinking that I can put an onLoad on the BODY tag that will just call a Javascript method called initializePage() and then provide this initializePage() call in my specific page

All, I have a left navigation partial that I want to dynamically generate CSS classes for based on the current controller action. In my ERb template, I have <DIV class="<%= get_menu_display_style(''login_form'') %>"> In application.rb, I have the method get_menu_display_style defined as: public def get_menu_display_style(action_requested)

Anyone know of any Ruby modules which can be used to parse an HTML page ? Thanks, Wes -- Posted via http://www.ruby-forum.com/.

All, In a template, I have <%= text_field :target_list, :DateReceived, { :title => ''uploaded_at'', :class => ''target_list_info'', :disabled => ''true'' } %> Here is the DateReceived method on my

I am trying to put some smarts around a call to <%= error_messages_for %> so that when I first come into this page i.e. when my instance variable @target_list has not been defined yet, the page doesn''t break. I''m doing this: <% if @target_list? %> <%= error_messages_for ''target_list'' %> <% end %> I get a syntax error on line 1.

Can you set a global before_filter action in application.rb? So, for example, you could control authentication for all of the controllers in an app.? Obviously, you would need a way to reference actions by controller within this "global before-filter". Thanks, Wes -- Posted via http://www.ruby-forum.com/.