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I have a Merchant class that has many Products. Product is an abstract class which has many subclasses (ProductA, ProductB, etc). All Products have common data, like ''name'', ''status'', ''created_on'', etc... but they also have some completely different properties. It seems like Active Record only supports Single Table Inheritance. This

Quick Overview: I have an ''Employee'', some ''Merchants'' and some ''Products''. A ''Merchant'' has many ''Products''. An ''Employee'' has multiple ''Merchants'', depending on their relationship. For example, the Employee may be the enrollment contact for one merchant and the

I''m trying to create a document upload system, where most of the code is the super class Document and just the path to file on the system is controlled by the sub classes. When I attempt to use my code, I get the following when I try to save the document. can''t dump anonymous class Class Any ideas? ** Migration ** class CreateDocuments < ActiveRecord::Migration def

I have a Company object which has multiple Contacts (has_many/belongs_to) I would like one of the contacts to be the primary contact. What''s the best way to do this? Right now I have: create table companies ( id int not null auto_increment, name varchar(50) not null, primary_id int null, constraint fk_company_primary_contact foreign key (primary_id) references contacts(id),