i have an array of activerecord objects, each object has an id and a name. They would look something like this:

id,name
1,red
1,green
2,red
3,yellow
4,red
4,green
4,yellow
5,red
5,green

I wish to process them so that firstly they are grouped by their id, with the names concatenated. And then duplicate concatenations are counted, so i would end up with an array:

count, names
2,red green
1,red green yellow
1 red
1,yellow