Question

I’m running a rake task to destroy all of my “course” objects:

task :destroy_all_classes => :environment do 
  Course.all.each do |c| 
    c.destroy
  end 
end

This destroys most of the courses, but 12 remain (out of 40+). What might be preventing me from deleting them?

If I try deleting each course manually, through the console, I get this:

ruby-1.9.2-p290 :030 > Course.find(1).destroy
 => false 

Answer 1

Enable cascade destroy.

Course have at lest one “has many”or “has one” relation with another model.Something like

class Course < ActiveRecord::Base
  has_many :somethings
  has one : something
end

make it

class Course < ActiveRecord::Base
  has_many :somethings, :dependent => :destroy
  has one :something, :dependent => :destroy
end

You can also use

 accepts_nested_attributes_for :something, :allow_destroy => true

Best of luck !!!