Does seem to be a bit of repetition in your description but it seems straightforward.
You have a Module which has an Entity_type column Each Module has many Chapters where Chapters has a column named module_id. Each Chapter has many Activities with similar foreign key constraints or You have one Activities table, in which case you don't specify a relationship. Once you set up the has_many and belongs_to pairs, Rails provides the methods to interact with the data. Checkout some ActiveRecord tutorials like this screencast - http://www.railsenvy.com/2007/8/8/activerecord-tutorial On Jun 6, 10:29 pm, Ritvvij <[email protected]> wrote: > Hello guys, > > Need help!! Finding it hard to model the 'model' :P within the given > rails associations. > > In java terms, my requirements are... > > There are 3 entities - module, chapter and activity. > > Chapter entity is a specilization of Module entity (inheritence) > Activity entity is a specialization of Module entity (inheritence) > And the tables would have looked like: > 1. Module table = Module_Id, Entity_type, .... > 2. Chapter = Chapter_id, ..... > 3. Activity = Activity_id, ...... > > Hence, if I create a chapter then the tables would be populated as: > Module table = Module_Id, Entity_type, .... = values ( 100, > chapter , .... ) > Chapter table = chapter_id, ..... = values ( 100, .... ) > Basically, the ids of chapter and module would be same and module > table would store the type. > > Now, if I create a activity then the tables would be populated as: > Module table = Module_Id, Entity_type, .... = values ( 101, > activity , .... ) > Activity table = activity_id, ..... = values ( 100, .... ) > Basically, the ids of activity and module would be same and module > table would store the type. > > Can you please guide me how I can model it similarly in rails 2.3.2? > > Thanks in advance > Ritvvij Parrilkh --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
