similar to: circular relationship - habtm

Hello all, I am new to RoR and am working my way through Timothy Fisher''s Ruby On Rails Bible. I''m stuck on page 81. I have followed the steps leading to this page, i.e. cd rails_projects rails contactlist <creates all the directories> ruby script/server webrick <shows the Welcome Aboard page> open a cmd window and run mysql: create database contactlist_development;

Could someone explain this? #config/initializers/ar_attributes.rb module ActiveRecord module AttributeMethods alias_method :ar_read_attribute, :read_attribute def read_attribute(attr_name) p "read_override" ar_read_attribute(attr_name) end alias_method :ar_write_attribute, :write_attribute def write_attribute(attr_name, value)

In my application a user working at a dropzone can manipulate transactions against customer accounts. Here''s my models: class Transaction < ActiveRecord::Base belongs_to :account end class Account < ActiveRecord::Base belongs_to :dropzone has_many :transactions end class Dropzone < ActiveRecord::Base has_many :transactions, :through => :accounts do def

Hi Gurus, I have a class, specified in models cart.rb, which doesn''t inherit from anything--it''s just a container class Cart ... I just discovered I can''t call number_to_currency in that class. Any idea how to "include" it in my code? I tried ActionView.number_to_currency without luck. I could kill a few lines of non-DRY regexp code in cart.rb if I could

I have a users table. I have a assignment table. and I have to log in to see my assignments. i can and I hasve a session id. I can make a new assignment and save my id in the user_id field of the assigment table. I want to share my assignments. so I can create a assignments_users table. this way I can have assignment 1 shared with user 1 and 2. and If I log in as user 1 or 2 I see the assignment.

I''ve spent hours researching the subject and have tried many test sequences in IRB, and rails console but I''m just having trouble making headway into what is probably a very easy subject. I understand arrays with at least 4 other languages but with Ruby I haven''t found a mental connection with how I can assign variables to arrays.. Take for example: def

1. I have a few tables: ''users'', ''shops'', ''addresses'', and ''pictures''. 2. Users and Shops will both use the addresses and pictures tables. I have created several mapping tables: addresses_shops pictures_shops addresses_users pictures_users 3. Users CAN have many addresses and pictures (simple HABTM), but... 4.

Earlier I forgot to add updated_at and created_at columns for my HABTM relationship so I created a migration to add them. In the migration I also want to go back and set the value of the created_at and updated_at columns for the previous rows. What is the best way to do that? Initially I thought I was being smart and decided to put an UPDATE SQL query in a find_by_sql statement and

Ok, I have a People table, a Shows table, a Techs table, and a Castmembers table. The people table has contact info about each person, the techs and castmembers tables have information about the persons specific role in that sshow. i want to call @show.techs (or somethign equivelent, I don''t want to start that code yet) and get all the techs associated with the show, and the

If I have a HABTM relationship between two models (places, pictures), can I delete the record from the join table without also destroying the objects? IE: 1. @places.pictures << @picture 2. @places.pictures.find( @picture.id ).destroy I''d want line #2 (...or something similar unless I''m way off) to destroy the record in pictures_places only, and not anything from the

Hi, I am trying to perform a query with ActiveRecord that I want to put into a Rails application later. For now I just wrote it within a plain old Ruby script for easier testing. I am working with an existing database so I had to map some foreign keys myself. As you can see from the models below, the database has a structure of Prospectlists <=habtm=> Contacts <=habtm=> Accounts

If Product and Category models are in a habtm relationship, i.e. class Product < ActiveRecord::Base has_and_belongs_to_many :categories end class Category < ActiveRecord::Base has_and_belongs_to_many :products end I want a piece of code to be executed every time a product is connected to a category. Where do I put this code? Which callback (and on which model) will be triggered? Any

I have the following line in my controller: @tag = Tag.find_by_name @params[:id] Now, how do I order the rows based on the HABTM relationship problems_tags i.e. problems_tags.created_at DESC Thanks :-) John Kopanas http://www.kopanas.com ============================================================ http://www.soen.info - Index of online software engineering knowledge http://www.cusec.net -

Hi all, I''ve got the following two objects and the habtm relationship isn''t putting records in the DB: class Cse < ActiveRecord::Base has_and_belongs_to_many :conditions end class Condition < ActiveRecord::Base has_and_belongs_to_many :cses end I''m creating a Cse object and filling the collection of Conditions, then calling save on the Cse object.

I have two tables ("products" and "categories") that have a has_and_belongs_to_many relationship, and I need to be able to arbitrarily sort products in the scope of a category using something like acts_as_list. Problem is, since each product can belong to multiple categories, it doesn''t work to use acts_as_list and have the "position" field be in the

Hello all, I have the following models: class Sku < ActiveRecord::Base has_and_belongs_to_many :options end class Option < ActiveRecord::Base has_and_belongs_to_many :skus end By default if I destroy an Option any relationships between Options and Skus will be removed as well. But, I want to prevent an Option from being destroyed when it is associated with a Sku in the options_skus

Hi all. I have 2 tables, one is work_times, and one is projects. I use a joint table to link 2 as they are has and belongs to many relationship . so there is a project_work_time. Now I need to add one column ''work_hours'' that is unique to each row of joint table project_work_time. I need to make a view such that for one specific work_time, it lists a series of projects and

I have a HABTM relationship between my agents and listings tables. Each listing can have many agents and each agent can have many listings. In the agents_listings table I have a column called ''is_primary_agent'' which denotes if the agent is responsible for the listing - only one agent can be primary. At the moment I use this in my listing_controller''s view

OK. This may help, but it will also make your head hurt. The basic problem that you''re running into is that you want a "for all" operator and sql doesn''t have one. Instead, you have to think of the query in terms of the logically equivalent "not exists not". Effectively, a proposition is true for all x if you can''t find a counter-example in

Hello forum readers, Let''s say i have two models: Person and Role (i replicated the problem with Post & Tag as well, as i thought the problem was linked to some application-specific rights problem, but it wasn''t). In Person, attr_accessible role_ids is declared, so it accepts an array of Role ids as an argument when creating / updating. If i fire up the rails console and