Forums | Admin Discussion Forums: open-discussion Start New Thread Nested Flat Threaded Ultimate Show 25 Show 50 Show 75 Show 100   By: yossarian dunbar RE: Nil object evaluating parent.children? [ reply ]   2006-07-27 15:42 The answer to this was actually pretty simple. I had: <%= text_field 'concept', 'title', :size => 30 %> When I should have had: <%= text_field 'concept[]', 'title', :size => 30 %> By: yossarian dunbar Nil object evaluating parent.children? [ reply ]   2006-07-18 12:54 Hi, thanks for the guide, but I am having a problem. I've got my models set up as class Project < ActiveRecord::Base validates_presence_of :title has_many :concepts end However, on create and update in my ProjectController I am getting the following error: NoMethodError in ProjectController#update You have a nil object when you didn't expect it! The error occured while evaluating nil.concepts This is strange, as when I execute a breakpoint the @project object is clearly there and populated (during an update, it has an id, on creation it doesn't). This plug-in looks great, it'll do everything I want from it if I can get past this, but I'm a little bit stumped here. Using Rails 1.1 release, MySQL 5.0.19, Ruby 1.8.4 on Debian.