List all Books by Price Range - ruby

Question

I have created a functioning e-commerce platform where Members can buy books. Everything works fine, But I would like to group all of my Books in my Index Page by a Price Range.
Currently I am able to list all of my Books through a Loop, but my code is not very DRY.
How can I list all of the Books corresponding to a Price Range while keeping my code DRY?
EX of what I need.
Books Under $1
(.50, .99, .99. .50)
--------------------------
Books Between $1 & $2
(1.50, 1.99, 1.99. 1.50)
--------------------------
Books Between $2 & $3
(2.50, 2.99, 2.99. 2.50)
CONTROLLER
class BooksController < ApplicationController
def index
#publisher = Publisher.find(params[:publisher_id])
#books = #publisher.books.where(:ready => true).order("price")
end
end
MODELS
class Book < ActiveRecord::Base
attr_accessible :publisher_id, :price, :ready
end
VIEW
###This works fine, but can be really repetitive if I have books at a high price.
<% #books.each do |book| %>
<% if 0 <= book.price && book.price < 1 %>
Books under $1
<% end %$>
<% if 1 <= book.price && book.price < 2 %>
Books Between $1 & $2
<% end %$>
<% if 2 <= book.price && book.price < 3 %>
Books Between $2 & $3
<% end %$>
<% if 3 <= book.price && book.price < 4 %>
Books Between $3 & $4
<% end %$>
<% end %>

Answer 1

You can group by price.to_i to get them grouped properly, and then use a loop to write them all:
<% #books.group_by { |x| x.price.to_i }.each do |low_price, books| %>
<p>
Books between $<%= low_price %> and $<%= low_price + 1 %><br/>
(<%= books.map(&:price).join(', ') %>) <br/>
--------------------------
</p>
<% end %>

Answer 2

try a method in your books model:
def by_price(low, high)
self.price.between?(low, high)
end
then you could call books.by_price(0, 5) and get books between $0 and $5