arunagw

ruby-1.9.2-p0 > b = Blog.create(:title => "This is blog")
 => #<Blog _id: 4d529be33e4dd32664000002, title: "This is blog"> 
ruby-1.9.2-p0 > Blog.count
 => 1 
ruby-1.9.2-p0 > b.comments.create(:body => "This is body")
 => #<Comment _id: 4d529bf63e4dd32664000003, body: "This is body"> 
ruby-1.9.2-p0 > b.comments.count
 => 1 
ruby-1.9.2-p0 > reload!
Reloading...

arunagw

ruby-1.9.2-p0 > b = Blog.first
 => #<Blog _id: 4d529be33e4dd32664000002, title: "This is blog"> 
ruby-1.9.2-p0 > b.comments.length
 => 0 
ruby-1.9.2-p0 > b.comments.create(:body => "New body again")
 => #<Comment _id: 4d529f0c3e4dd329a9000001, body: "New body again"> 
ruby-1.9.2-p0 > b.comments.count
 => 1 
ruby-1.9.2-p0 > b.comments.clear
 => []