Question

I’m coding the site http://Meer.li, a site where users can upload designs.

In my design model, I need to find designs that have the same title and group them. How do I make such a query?

Right now I just have:

@designs = Design.order_by( :created_at, :desc )

I’m running rails 3.2, ruby 1.9.3 and I’m using mongoid for the database.

Further Explanation:

Sorry if I weren’t specific enough. I have a lot of designs and some of these designs have the same title. First of all I want to find all the designs that have the same title. Second of all I want to group those designs within an array, so I don’t need several arrays to get my designs. Last thing, is that the designs with the same title, should only be grouped if they’re made by the same user

Answer 1

If i got your question right this should do the trick:

@designs = Design.where(:title => "someTitle").order_by( :created_at, :desc )

UPDATE:

so maybe this works

Design.select("title, count(title) as title_count").group(:title).having("title_count > 1")

never tried this with mongo db – maybe it works or it helps you to adapt it for your needs

hope this helps!