Re: course <-> topic, take 3

["Ilya A. Volynets-Evenbakh" <ilya@total-knowledge.com>]

Alexey Parshin wrote:
> Well, since any topic can be made top-level topic that means - any
> topic may become a course by a simple connections transformation.
And problem here is evident - a topic may be TLT for one course, yet a
subtopic for another one.
How do you expect to handle that.
> If we need an extra fields - that may be done with the
> topic_description table, or something similar, that relates only to
> topic and nothing else.
Maybe, if that's appropriate for the case.
>
> 2006/10/14, Ilya A. Volynets-Evenbakh <ilya@total-knowledge.com
> <mailto:ilya@total-knowledge.com>>:
>
>     Actually let me add another thing:
>     this condition also applies to other tables, relating to the course.
>     I.E. if you need separate treatment/different data in ACLs
>     or some such depending on whether topic they link to is TLT
>     or not, we'll do the same.
>
>     Ilya A. Volynets-Evenbakh wrote:
>     > I'll accept that on one condition: this flag is going to be
>     > the only field that differentiates topic from course.
>     > I.E. if you feel the need to add more fields, that apply only
>     > to TLTs, you will move them out to separate table.
>     >
>     > Alexey Parshin wrote:
>     >
>     >> A simple logical conclusions.
>     >>
>     >> 1) Most of the properties of the course matching to the
>     properties of
>     >> the topic.
>     >> 2) The difference between topic and course is the connections
>     to other
>     >> objects
>     >> 3) Since any object can be connected to almost any other, the
>     course
>     >> connections is just an extended version of topic connection.
>     >>
>     >> So, from any logical point, course is topic. We don't need to
>     have a
>     >> separate object in the database for this. We may have  a flag
>     >> 'Top-level' in the topic, that allows an extra functionality
>     for the
>     >> course.
>     >>
>     >
>     >
>
>     --
>     Ilya A. Volynets-Evenbakh
>     Total Knowledge. CTO
>     http://www.total-knowledge.com
>
>
>
>
> -- 
> Alexey Parshin,
> http://www.sptk.net 

-- 
Ilya A. Volynets-Evenbakh
Total Knowledge. CTO
http://www.total-knowledge.com