Thank You so much Colin. On Monday, August 31, 2015 at 12:46:53 AM UTC-7, Colin Law wrote: > > On 30 August 2015 at 23:27, venu madhav chitta > <[email protected] <javascript:>> wrote: > > No they just use existing tables, do some joins and generate the item > > recommendations. Their interface looks like: recommendations(user_id) > and > > returns [item_id] > > First if you are using joins manually then it may be that you have > specified the associations incorrectly as it should only rarely be > necessary to specify the joins. In addition you said in the original > post that you were using sql to query, this is almost certainly not > right unless you are doing something rather complex that the rails > activerecord interface will not handle. If you want advice on that > then ask a separate question showing the query you are performing. > > So if I understand correctly you have some code that references > several tables but it does not seem appropriate to just put the code > inside one of the models. In such situations I would either make it a > model which is not derived from ActiveRecord or put it in a module in > lib. Whichever seems most appropriate. Probable a model in your > case. Don't get stressed over exactly where you put things however, > there are no hard rules, just do whatever seems most appropriate for > your case. > > Colin > > > > > On Sunday, August 30, 2015 at 1:03:20 AM UTC-7, Colin Law wrote: > >> > >> On 30 August 2015 at 04:36, venu madhav chitta > >> <[email protected]> wrote: > >> > I am implementing strategy pattern in Rails where I have Models like > >> > User, > >> > Item, Category and need to recommend items for the users depending on > >> > various algorithms (strategies) that user selects in view. > >> > > >> > I am having a Recommend class which has an interface of > >> > recommend(user_id, > >> > strategy) and returns array of item_id. The strategy in recommend > will > >> > be > >> > decided at runtime depending on the option user selects in the view. > I > >> > have > >> > placed the recommend interface in /lib directory and the strategies > in > >> > /lib/strategy directory. The strategies or algorithms right now will > do > >> > SQL > >> > queries to give recommendations which is naive. > >> > > >> > I want to make sure if I placed the files in proper directories or > >> > Should I > >> > need place the recommend class and all the strategies in models or > >> > app/services or any other?. I am really confused. > >> > >> Are there database tables behind the recommend and strategy code or > >> are they just code? > >> You say there are Items but have not told us what an Item is. > >> > >> Colin > > > > -- > > 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] <javascript:>. > > To post to this group, send email to [email protected] > <javascript:>. > > To view this discussion on the web visit > > > https://groups.google.com/d/msgid/rubyonrails-talk/c9c746c9-2957-49a3-a9ba-f52aa7ae61ec%40googlegroups.com. > > > > > > For more options, visit https://groups.google.com/d/optout. >
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