How to display multiple record of same type only once?

How to display multiple record of same type only once?

I have a rails 3.1.12 application, in which suppose i have a table A and
in that i have some data and it is associated with table B with has_many
relationship, i mean to say
class A < ActiveRecord::Base
has_many :B, :conditions => {:type => "B"}, :dependent => :destroy
has_many :c, :class_name => "B", :conditions => {:type => nil},
:dependent => :destroy
end
and in B's model i have :
class B < ActiveRecord::Base
belongs_to :A
end
and i have some data in my table C which is inherited from B
- **name** **amount**
- c1 10
- c2 20
- c3 5
- c1 4
- c2 15
and i want to display this duplicate items only one time something like:
name *amount*
c1 14
c2 35
c3 5
But i don't have any idea how to get this, i have tried **group_by** and
uniq methods but they are not working in my case.In my controller A on
view action i have declare all this like:
class AsController < ApplicationController
def show
@a = A.find(params[:id])
@bs = @a.bs
@cs = @a.cs
respond_to do |format|
format.html # show.html.erb
format.xml { render :xml => @a }
end
end
end
and In my view file i have called all these like:
<%= render :partial => "b_item_details", :collection => @bs %>
<%= render :partial => "c_line_item_details", :collection => @cs %>
I am sure some might faced such issue, any help would be thankful