similar to: building and saving has_many and has_one relations

Hi All, I need your suggestions for the following. I am still learning RoR and pardon my ignorance. I have say two tables. Table A : students Table B : addresses Table B has student_id as the foreign key to Table A If I am displaying the list of students and wanted to get individual students addresses based on their id, is the only option is to get the id from students controller method list

R-help group, I'm looking for some assistance on using an R-script to read STDIN from hadoop. Example, say I have two tables. One is a student table, the other is a class roster table (tables join on student_id). Student SAT score is in the student table, whether the student passed or not is in the roster table. So to determine if a student passed or failed based on their SAT score, I'd

I have the following model structure setup. class User < ActiveRecord::Base end class Parent < User has_many :relationships has_many :children, :class_name => "Student", :through => :relationships, :conditions => "related_as = ''parent''" end class Student < User has_many :relationships

Here''s a join table for an educational institution: create_table "student_appointments", :force => true do |t| t.column "supervisor_id", :integer, :default => 0, :null => false t.column "student_id", :integer, :default => 0, :null => false t.column "course_id", :integer, :default => 0, :null => false [other columns

I am working with mapping ActiveRecord onto a legacy database. All is going well (using set_table_name, set_primary_key, etc), but I can''t get my many<=>many relationships to work. My contrived example of the situation: Student has_and_belongs_to_many Teachers. This is mapped via table student2teacher where the foreign keys are studentId and teacherId. The primary key in Student

Hey- I''m using ROR 1.0 and script.aculo.us 1.5.1. I''ve been trying unsuccessfully to render a partial in a DIV, but can''t seem to get the right combination of stuff to make it work. There seems to be a few different ways of going about it. Right now I can render a partial. What do I need to to render the partial in a div? Here is what it looks like so far: #

Hi! I''ve successfully created a Rails web service. I can connect to it with an XML-RPC client, without any problems at all. However, when I try to use a gSOAP application to connect to the web service, it doesn''t work. The back trace that I get is at the end of this message. From the back trace, it appears that the SOAP request is not being recognized as a SOAP

Hi! I''ve successfully created a Rails web service. I can connect to it with an XML-RPC client, without any problems at all. However, when I try to use a gSOAP application to connect to the web service, it doesn''t work. The back trace that I get is at the end of this message. From the back trace, it appears that the SOAP request is not being recognized as a SOAP request, and

People, I want to design a historical sports db for my old school. I think at the moment it should be like: A year has many teams A team has many students A student has one lastname, firstname and middlename but a student can also have many teams (eg summer/winter abd over a number of years) . . Is there a problem with this? Doesn''t it just mean that there will be a student table

Im having an issue that seems to only happen when trying to use a transaction. Ive used transactions many times in the past and Im at a loss as to why im getting the stack level too deep problem. SystemStackError - stack level too deep: actionpack (3.2.13) lib/action_dispatch/middleware/reloader.rb:70:in `'' I have a StackOveflow with more detail -

Hi guys! I''m developoning a small web-app, everything goes quickly and well!! I need some help, im trying to destroy at the same time some records of varius of my models. My model are relathionate with has_many, has_one. What could be the best way to do it? Could i use act_as_a_tree or there are other cool way? Thanks P.D: Sorry by my bad english

Considering an object with several has_many :through => associations, what is the ''best'' way to handle validations? As an example: class Student < ActiveRecord::Base # some attrbutes like # :name # :grade # relationships has_many :students_assignment, :dependent => :destroy has_many :assignments, :through => :students_assignment has_many

I''m new to ruby and rails and as a result am a bit lost on implementing a one to many relationship. In my DB I have 2 tables contents and locations, contents contains the foreign key location_id. I generated a content and a location model using rails scripts and then edited the models as follows class Content < ActiveRecord::Base has_one :location end class Location <

Hi everyone. I''ve been bending my head around a has_one association for about 3 hours now and I can''t get it to work. I''m pretty sure it''s not something I''m overlooking anymore. Here''s the essential part of the schema I''m working with: ----- t :topics c :id c :last_post_id t :posts c :id c :topic_id ----- Topics are simply named

My apologies if this is a dumb question, but I''ve searched around and haven''t been able to come up with a solution. Is there a way when specifying a has_one association to specify a default value for an object if data is missing in the child table. For instance: class Student has_one :university end if no university is associated to the student in the database, I would

Hiall, Say I have class User has_one :community end class Community belongs_to :user end Will the following work and both save user and community if validation doesn''t fail? user = params[:user] user.community = params[:community] user.save Or do I have to do something like the following user = params[:user] if user.save user.community = params[:community] end to be on the

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Hello, im trying to wrap a fairly ugly legacy schema using AR. How to handle normalized informations which aren''t connected via the pk? create table what ( myid int, myclass int, ;; references blahclass.blahid mygender int ) create table blahclass ( blahid int, mdesc1 text, fdesc1 text) ) I would like to wrap this as class What < AR::Base has_one :blahclass class

I''ve been using this sort helper to have sortable tables. http://wiki.rubyonrails.com/rails/pages/Sort+Helper I''ve encountered a situation where I need to sort a column that is not part of a table, but it''s related table. For example, say I have db tables called foos and bars. Foos have fields called name and title. And bars have fields called note and foo_id. Foos

Let''s say I have: A BELONGS_TO B B HAS_ONE A (with :dependent=>:nullify) But this association does not need to exist. In other words, I could have many A''s and B''s that are not associated in this manner. Presently, if I try to delete "B": 1. If B is associated to an "A", this works fine and A.my_B is nullified. 2. If B is NOT associated, I