Ruby on Rails: No method error in Rails 3.0.10
abstract (1.0.0)
actionmailer (3.2.2, 3.0.10, 3.0.5, 3.0.3, 2.3.5, 2.1.0)
actionpack (3.2.2, 3.0.10, 3.0.5, 3.0.3, 3.0.0.beta3, 2.3.5, 2.1.0)
activemodel (3.2.2, 3.0.10, 3.0.5, 3.0.3, 3.0.0.beta3)
activerecord (3.0.10)
activeresource (3.2.2, 3.0.10, 3.0.5, 3.0.3, 2.3.5, 2.1.0)
activesupport (3.2.2, 3.0.10, 3.0.5, 3.0.3, 3.0.0.beta3, 2.3.5, 2.1.0)
arel (3.0.2, 2.0.10, 2.0.6)
bcrypt-ruby (3.0.1, 2.1.2)
bson (1.1.5)
bson_ext (1.1.5)
builder (3.0.0, 2.1.2)
bundle (0.0.1)
bundler (1.1.3, 1.1.1, 1.1.0)
cancan (1.6.7, 1.4.1)
coffee-rails (3.2.2)
coffee-script (2.2.0)
coffee-script-source (1.3.1, 1.2.0)
devise (2.0.4, 1.5.3, 1.1.5)
erubis (2.7.0, 2.6.6)
execjs (1.3.0)
hike (1.2.1)
i18n (0.6.0, 0.5.0, 0.3.7)
journey (1.0.3)
jquery-rails (2.0.2, 2.0.1)
jquery_datepicker (0.3.4)
json (1.6.6, 1.6.5)
libv8 (3.3.10.4 x86-linux)
mail (2.4.4, 2.2.19, 2.2.12, 2.2.7)
memcache-client (1.8.5)
mime-types (1.18, 1.17.2, 1.16)
mongo (1.1.5)
mongoid (2.0.0.beta.20)
multi_json (1.2.0)
mysql2 (0.3.11)
nifty-generators (0.4.2)
orm_adapter (0.0.7)
polyglot (0.3.3, 0.3.1)
rack (1.4.1, 1.2.5, 1.2.1, 1.1.3, 1.0.1)
rack-cache (1.2)
rack-mount (0.6.14, 0.6.13)
rack-ssl (1.3.2)
rack-test (0.6.1, 0.5.7, 0.5.6)
rails (3.0.10)
railties (3.2.2, 3.0.10, 3.0.5, 3.0.3)
rake (0.9.2.2, 0.8.7)
rdoc (3.12)
rolify (3.1.0)
sass (3.1.15)
sass-rails (3.2.5)
sprockets (2.1.2)
sqlite3 (1.3.5)
therubyracer (0.9.10)
thor (0.14.6)
tilt (1.3.3)
treetop (1.4.10, 1.4.9)
tzinfo (0.3.33, 0.3.32, 0.3.23)
uglifier (1.2.4)
warden (1.1.1, 1.0.3)
will_paginate (3.0.3, 3.0.pre2)

amrit@PC148881:~/mytodos$ rails console
Loading development environment (Rails 3.0.10)
1.9.2-p290 :001 > todo=todo.first
NoMethodError: You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.first
    from (irb):1
    from /home/amrit/.rvm/gems/ruby-1.9.2-p290@1.9.2/gems/railties-3.0.10/lib/rails/commands/console.rb:44:in `start'
    from /home/amrit/.rvm/gems/ruby-1.9.2-p290@1.9.2/gems/railties-3.0.10/lib/rails/commands/console.rb:8:in `start'
    from /home/amrit/.rvm/gems/ruby-1.9.2-p290@1.9.2/gems/railties-3.0.10/lib/rails/commands.rb:23:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'
1.9.2-p290 :002 > todo=Todo.first
 => #<Todo id: 1, name: "Office", description: "work to be completed at office", created_at: "2012-04-17 08:53:35", updated_at: "2012-04-17 08:53:35">
1.9.2-p290 :003 > task=Todo.tasks.new
NoMethodError: undefined method `tasks' for #<Class:0xae32588>
    from /home/amrit/.rvm/gems/ruby-1.9.2-p290@1.9.2/gems/activerecord-3.0.10/lib/active_record/base.rb:1014:in `method_missing'
    from (irb):3
    from /home/amrit/.rvm/gems/ruby-1.9.2-p290@1.9.2/gems/railties-3.0.10/lib/rails/commands/console.rb:44:in `start'
    from /home/amrit/.rvm/gems/ruby-1.9.2-p290@1.9.2/gems/railties-3.0.10/lib/rails/commands/console.rb:8:in `start'
    from /home/amrit/.rvm/gems/ruby-1.9.2-p290@1.9.2/gems/railties-3.0.10/lib/rails/commands.rb:23:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'
1.9.2-p290 :004 > ^C
1.9.2-p290 :004 > t=Task.new
 => #<Task id: nil, description: nil, due_date: nil, due_time: nil, completed: nil, todo_id: nil, created_at: nil, updated_at: nil>
1.9.2-p290 :005 > t.description="meeting"
 => "meeting"
1.9.2-p290 :006 > t.save
 => true
1.9.2-p290 :007 > task=Todo.tasks.new
NoMethodError: undefined method `tasks' for #<Class:0xae32588>
    from /home/amrit/.rvm/gems/ruby-1.9.2-p290@1.9.2/gems/activerecord-3.0.10/lib/active_record/base.rb:1014:in `method_missing'
    from (irb):7
    from /home/amrit/.rvm/gems/ruby-1.9.2-p290@1.9.2/gems/railties-3.0.10/lib/rails/commands/console.rb:44:in `start'
    from /home/amrit/.rvm/gems/ruby-1.9.2-p290@1.9.2/gems/railties-3.0.10/lib/rails/commands/console.rb:8:in `start'
    from /home/amrit/.rvm/gems/ruby-1.9.2-p290@1.9.2/gems/railties-3.0.10/lib/rails/commands.rb:23:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'
1.9.2-p290 :008 >

task=todo.tasks.new

todo=Todo.first

todo = Todo.all.first