On 22 May 2011 11:35, Wolfgang <[email protected]> wrote: > STI is a good approach, but my "subtables" have additional attributes > and afaik this isn't supportet by STI, is it?
Yes, you just put the whole set of all attributes in the table. It wastes a small amount of space in the db but generally that is not an issue. Colin > > For example: > > user << Base > id > firstname > lastname > address > end > > employee << user > <all of the above and additionally:> > salary > end > > On 22 Mai, 10:41, Colin Law <[email protected]> wrote: >> On 22 May 2011 09:37, Wolfgang <[email protected]> wrote: >> >> >> >> >> >> >> >> >> >> > Hello Guys, >> >> > does anybody know wheter RoR is able to implement a generalisation of >> > a database? I didn't find any solution for that on the internet. >> >> > Example >> >> > Person : Customer >> >> > or >> >> > Person : Employee >> >> > in the database such a generalisation is characterized by having the >> > same PK in Customer and Person or Employee and Person! >> >> Would Single Table Inheritance (STI) dowhat you want? >> >> Colin > > -- > 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. > > -- 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.
