search for: singletableinherit

I know that Rails uses the Single-Table Inheritance as mentioned in the wiki (http://wiki.rubyonrails.com/rails/pages/SingleTableInheritance). I was wondering if there was an easy way of implementing Class Table Inheritance easily (one table per class) as defined in http://www.martinfowler.com/eaaCatalog/classTableInheritance.html. The model that I am used to is Class Table Inheritance, and for some uses it just feels more eleg...

Hi all, I''ll do my best to explain this... I have the possibility to have two customer types in my system: 1. A "mailing list" type: new records are saved when user enters email address in the mailing list subscription form. 2. A "full" type: new records are saved when the user buys something and provides all their billing/shipping details, etc. Model: -

...I had no ''type'' column in my table.) 2. It''s entirely non-relational, and thus bad practice to suggest to those who do not well understand relational DBMSes (which is the vast majority of programmers out there) that this is any sort of a valid technique. SingleTableInheritance is a tool of desperation, when you can''t change your database schema to be relationally sound and make sense. It would in fact be nice if ActiveRecord provided support for class table inheritance. cjs -- Curt Sampson <cjs-gHs2Wiolu3leoWH0uzbU5w@public.gmane.org> +81...

Hello all, I am working on a app right now that is going to replace a paper form process out client has. This process has quite a few forms (about 30) and different groups of forms (section) need to be filled out based on what information is required from the user. For example, here is a possible process of 2 users: user 1 user 2 Section 1 Section 1 Section 2 Section 2

So, I''m coding my school project in Rails. There are two models, User and Restaurants. I noticed that in Restaurants, when you use the belongs_to method, you could specify the condition of the associated table. There are a few types of users, in the user_type column of the users table - owners is type 1, users are type 2. So in my haste to hand in enough code, in the Restaurant model,

Hi, currently I do some work with polymorphic associations in egde rails class Order < ActiveRecord::Base belongs_to :payment, :polymorphic => true end class CreditCardPayment < Payment end class PayPalPayment < Payment end class Payment < ActiveRecord::Base has_one :order, :as => :payment # common stuff in here end I want to use [Payment] for common functionality

I''ve been banging my head against this for quite some time and can''t figure out what is going on. I''m doing up a web site based on Typo and adding in some custom controllers. I''m running Typo from trunk, so it''s using the version of rails in vendor/rails. Everything is going smoothly...until now. I have one model that JUST. WON''T. WORK.

I''m currently coding a system which must store multiple contact methods for a user (phone, email, postal address etc). I''m planning a fairly straightforward inheritance hierachy for these, where each different method inherits from something like a ContactMethod class. The only mention of ActiveRecord support for inheritance I can find in the Wiki and the Agile Web Dev book is

Hello, we have a problem in a CMS project that we believe is basic for RoR developement and could concern others as well - or have already: RoR implements the ''Single Table Inheritance'' (STI) Pattern: http://www.martinfowler.com/eaaCatalog/singleTableInheritance.html .. through its ''ActiveRecord'' ORM. The Fowler example mentions a ''type'' column and RoR implements this directly - which we consider inconsistent with DB abastraction: It forces a ''type'' column in the database following the application...

I have been looking at the LoginGenerator gem. Looks great and can be easily modified. However in my app I have two places where people can login, one is for in my case "employees" the other is for "users". They are seperate tables in my database and have many different fields. I have an admin area located at ./sysadmin/ where only "employees" can login, they

Hi, I''m looking at developing a reasonably complex web application, where most of the complexity actually lays in the database and the queries I need run on it. Some "classes" or models need to consist of an assembly of several tables. It would be trivial enough for me to code these queries in SQL, but as far as I understand Rails is trying to hide the database as

Hello, I have a few models -- book, cd, dvd -- for which I''d like to have an abstract base superclass to hold some common stuff. That abstract class, I was thinking, would inherit from ActiveRecord. Didn''t work, though, and looking around, I found this: <http://wiki.rubyonrails.com/rails/pages/HowtoMakeAbstractModel>

I''m new to RoR and have used PHP. I want to develop a personal organizer that allows me to add lists (tables) and search them. The ActiveRecord concept seems to allow me to set up something that works with an existing table, but I want the ability to add tables without programming. I know how to do this in PHP and I can put the SQL into queries in RoR, but does ActiveRecord let

I am building an app right now that needs to grant access to three levels of members right now - each will have their own table in the DB. When creating the add_user action I am converting the password into a hashed password through the model. The way I am doing this right now, I will inevitably end up with repeated code in three different models. Is there a way I can define this code in