Hi, I would like to know how to count records in an association. My Models look like this:
// Users class User < ActiveRecord::Base has_many :read has_many :books, :through => :read end
//Read class Read < ActiveRecord::Base belongs_to :user belongs_to :book end
//Books class Book < ActiveRecord::Base has_many :read has_many :books, :through => :read end
In my book_controller I have these queries: @user = User.find(params[:user_id]) @topics = Topic.find(:all) @read_by_topic = Book.find(:all, :conditions => "topic_id=#{@user.topic_id.to_i}") @pending_books = @read_by_topic - @user.books
If I use this code @user.assignments.count it returns the number of books I've read from the join model.
My question is, how do I find out how many of books I still need to read? @read_by_topic - @user.books returns an array but I can't add a count. If I do it says I get an error that says, can't convert Fixnum into Array.
Any help?