On Tuesday, March 26, 2013 3:13:05 PM UTC+5:30, Colin Law wrote: > On 26 March 2013 09:33, Myth17 <[email protected] <javascript:>> wrote: > > Grade is anything like 4,5 or say HighSchool with a 'name' and > 'description' > > attribute. > > Please don't top post, it makes it difficult to follow the thread. > Thanks. > > So a curriculum has many grades and a grade has many curriculums. > A topic is associated with a set of grade/curriculum combinations. > > I think the solution is a join table (you will have to think of a good > name for it), I will say c_g_ts to save typing here. So: > Curriculum has_many c_g_ts and has_many topics through c_g_t and > has_many grades through c_g_t > Grade has_many c_g_ts and has_many curriculums through c_g_t and > has_many topics through c_g_t > Topic has_many ... > > CGT belongs_to Curriculum and Grade and Topic. > > Does that sound as if it will do the job? > > Colin > > > > > > On Tuesday, March 26, 2013 2:45:16 PM UTC+5:30, Colin Law wrote: > >> > >> On 26 March 2013 08:29, Myth17 <[email protected]> wrote: > >> > I have three models in Rails as : Curriculum, Grade and Topics. > >> > > >> > The relationship scenario is like : > >> > > >> > Curriculum 'International Baccalaureate(IB)' in grade '6' has_many > >> > Topics ( > >> > t1,t2,t3 and CompareFraction) > >> > > >> > Curriculum 'CBSE' in grade '5' has_many Topics (t1,t2,t4,t5 and > >> > CompareFraction) [ A Topic 'Compare Fraction' will be taught in many > >> > different curriculums but maybe in different grades ] > >> > > >> > A Grade, say 5 will itself be a part of all Curriculums like IB,CBSE. > >> > > >> > I need to store information such that for a Topic Compare Fraction, I > >> > can > >> > say: > >> > > >> > It is taught in IB in grade 5 > >> > > >> > It is taught in CBSE in grade 4. > >> > > >> > How can I set this up in Rails? > >> > >> You have not given us enough information. > >> > >> I have no idea what a Grade object is. What are the fields of a grade > >> object? > >> > >> Colin >
Apologies for Top Posting. The solution looks great. Thanks Colin! I was aware of has_many through but did not know I could apply it here for three models. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msg/rubyonrails-talk/-/Z1tgeybMgI0J. For more options, visit https://groups.google.com/groups/opt_out.
