# Undefined method \`eq' for nil:NilClass **URL:** \ **Category:** Rails\ **Created:** [August 18, 2010, 1:36pm UTC](https://www.ruby-forum.com/t/undefined-method-eq-for-nil-nilclass/193479 "2010-08-18T13:36:22Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![swengineer](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/97f17d/32.png) [@swengineer](https://www.ruby-forum.com/u/swengineer)\ **Post date:** [August 18, 2010, 1:36pm UTC](https://www.ruby-forum.com/t/undefined-method-eq-for-nil-nilclass/193479/1 "2010-08-18T13:36:22Z")
I’m walking through an example in the “Head First Rails” book, but, instead doing the examples using Rails3.0.0.rc. But, I’m getting this error when browsing for example: [http://localhost:3000/advs/1](http://localhost:3000/advs/1) undefined method `eq’ for nil:NilClass Provided that my advs\_controller.rb is as follows: [http://pastie.org/private/cd9zntg2ite57ept288kfa](http://pastie.org/private/cd9zntg2ite57ept288kfa) Any ideas why I’m getting that and a workaround for that? Thanks. ---
**Author:** ![swengineer](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/97f17d/32.png) [@swengineer](https://www.ruby-forum.com/u/swengineer)\ **Post date:** [August 18, 2010, 2:50pm UTC](https://www.ruby-forum.com/t/undefined-method-eq-for-nil-nilclass/193479/2 "2010-08-18T14:50:32Z")
What does your view look like? ---
**Author:** ![swengineer](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/97f17d/32.png) [@swengineer](https://www.ruby-forum.com/u/swengineer)\ **Post date:** [August 18, 2010, 2:21pm UTC](https://www.ruby-forum.com/t/undefined-method-eq-for-nil-nilclass/193479/3 "2010-08-18T14:21:15Z")
On 18 August 2010 12:36, Abder-Rahman A. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > I’m walking through an example in the “Head First Rails” book, but, > instead doing the examples using Rails3.0.0.rc. > > But, I’m getting this error when browsing for example: > > [http://localhost:3000/advs/1](http://localhost:3000/advs/1) > > undefined method `eq’ for nil:NilClass For an error like this it is better to show the full error trace, but first look at it yourself. Somewhere there you will usually find a reference to a line of your code. Look carefully at that line and the error and try and work out the problem yourself. The error is saying that you are trying to call a method on an object that is nil. A common cause of this is using the result of a find operation without checking that it did in fact find a record. If you still cannot see the problem then post the error trace and the code around the error. > Provided that my advs\_controller.rb is as follows: > > [http://pastie.org/private/cd9zntg2ite57ept288kfa](http://pastie.org/private/cd9zntg2ite57ept288kfa) For only a few lines of code it is better in my opinion to put it inline rather than a pastie. Particularly consider those who may find the thread in months and years yet to come, hoping for enlightenment, only to find that the pastie has disappeared. Colin ---
**Author:** ![swengineer](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/97f17d/32.png) [@swengineer](https://www.ruby-forum.com/u/swengineer)\ **Post date:** [October 12, 2010, 1:40am UTC](https://www.ruby-forum.com/t/undefined-method-eq-for-nil-nilclass/193479/4 "2010-10-12T01:40:06Z")
Hi, This was happened when i tried to give "Model.find " option in Query interface. On 6 September 2010 13:32, Kannan [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > 291:in `find_one' activesupport (3.0.0) lib/active_support/dependencies.rb:591:in activesupport (3.0.0) lib/active_support/dependencies.rb:181:in `send\_action’ > activesupport (3.0.0) lib/active\_support/callbacks.rb:93:in > `instrument' actionpack (3.0.0) lib/action_controller/metal.rb:173:in `block in > rack-mount (0.6.13) lib/rack/mount/code\_generation.rb:68:in > actionpack (3.0.0) lib/action\_dispatch/middleware/params\_parser.rb: > query\_cache.rb:28:in `cache' rack (1.2.1) lib/rack/sendfile.rb:107:in `call’ > rack (1.2.1) lib/rack/lock.rb:11:in `call’ > start\_thread’ > > > If you still cannot see the problem then post the error trace and the > > the thread in months and years yet to come, hoping for enlightenment, > > . > > For more options, visit this group at > > [http://groups.google.com/group/rubyonrails-talk?hl=en](http://groups.google.com/group/rubyonrails-talk?hl=en). – With Regards Palani Kannan. K Office: +49-531-2616-226 Mobile: +4917647098166 ---
**Author:** ![swengineer](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/97f17d/32.png) [@swengineer](https://www.ruby-forum.com/u/swengineer)\ **Post date:** [September 6, 2010, 4:39pm UTC](https://www.ruby-forum.com/t/undefined-method-eq-for-nil-nilclass/193479/5 "2010-09-06T16:39:35Z")
Hi, Me too got same error… I attached Full trace here… Kindly suggest on this issue… undefined method `eq’ for nil:NilClass activesupport (3.0.0) lib/active\_support/whiny\_nil.rb:48:in `method_missing' activerecord (3.0.0) lib/active_record/relation/finder_methods.rb: 291:in`find\_one’ activerecord (3.0.0) lib/active\_record/relation/finder\_methods.rb: 281:in `find_with_ids' activerecord (3.0.0) lib/active_record/relation/finder_methods.rb: 107:in`find’ activerecord (3.0.0) lib/active\_record/base.rb:439:in `find' app/models/taxa.rb:2:in`class:Taxa’ app/models/taxa.rb:1:in `' activesupport (3.0.0) lib/active_support/dependencies.rb:454:in`load’ activesupport (3.0.0) lib/active\_support/dependencies.rb:454:in `block in load_file' activesupport (3.0.0) lib/active_support/dependencies.rb:591:in`new\_constants\_in’ activesupport (3.0.0) lib/active\_support/dependencies.rb:453:in `load_file' activesupport (3.0.0) lib/active_support/dependencies.rb:340:in`require\_or\_load’ activesupport (3.0.0) lib/active\_support/dependencies.rb:491:in `load_missing_constant' activesupport (3.0.0) lib/active_support/dependencies.rb:183:in`block in const\_missing’ activesupport (3.0.0) lib/active\_support/dependencies.rb:181:in `each' activesupport (3.0.0) lib/active_support/dependencies.rb:181:in`const\_missing’ activesupport (3.0.0) lib/active\_support/dependencies.rb:503:in `load_missing_constant' activesupport (3.0.0) lib/active_support/dependencies.rb:183:in`block in const\_missing’ activesupport (3.0.0) lib/active\_support/dependencies.rb:181:in `each' activesupport (3.0.0) lib/active_support/dependencies.rb:181:in`const\_missing’ app/controllers/taxas\_controller.rb:5:in `index' actionpack (3.0.0) lib/action_controller/metal/implicit_render.rb:4:in`send\_action’ actionpack (3.0.0) lib/abstract\_controller/base.rb:150:in `process_action' actionpack (3.0.0) lib/action_controller/metal/rendering.rb:11:in`process\_action’ actionpack (3.0.0) lib/abstract\_controller/callbacks.rb:18:in `block in process_action' activesupport (3.0.0) lib/active_support/callbacks.rb:435:in`\_run\_\_402958380944449391\_\_process\_action\_\_4448255831886203218\_\_callbacks’ activesupport (3.0.0) lib/active\_support/callbacks.rb:409:in `_run_process_action_callbacks' activesupport (3.0.0) lib/active_support/callbacks.rb:93:in`run\_callbacks’ actionpack (3.0.0) lib/abstract\_controller/callbacks.rb:17:in `process_action' actionpack (3.0.0) lib/action_controller/metal/instrumentation.rb: 30:in`block in process\_action’ activesupport (3.0.0) lib/active\_support/notifications.rb:52:in `block in instrument' activesupport (3.0.0) lib/active_support/notifications/instrumenter.rb: 21:in`instrument’ activesupport (3.0.0) lib/active\_support/notifications.rb:52:in `instrument' actionpack (3.0.0) lib/action_controller/metal/instrumentation.rb: 29:in`process\_action’ actionpack (3.0.0) lib/action\_controller/metal/rescue.rb:17:in `process_action' actionpack (3.0.0) lib/abstract_controller/base.rb:119:in`process’ actionpack (3.0.0) lib/abstract\_controller/rendering.rb:40:in `process' actionpack (3.0.0) lib/action_controller/metal.rb:133:in`dispatch’ actionpack (3.0.0) lib/action\_controller/metal/rack\_delegation.rb: 14:in `dispatch' actionpack (3.0.0) lib/action_controller/metal.rb:173:in`block in action’ actionpack (3.0.0) lib/action\_dispatch/routing/route\_set.rb:62:in `call' actionpack (3.0.0) lib/action_dispatch/routing/route_set.rb:62:in`dispatch’ actionpack (3.0.0) lib/action\_dispatch/routing/route\_set.rb:27:in `call' rack-mount (0.6.13) lib/rack/mount/route_set.rb:148:in`block in call’ rack-mount (0.6.13) lib/rack/mount/code\_generation.rb:93:in `block in recognize' rack-mount (0.6.13) lib/rack/mount/code_generation.rb:68:in`optimized\_each’ rack-mount (0.6.13) lib/rack/mount/code\_generation.rb:92:in `recognize' rack-mount (0.6.13) lib/rack/mount/route_set.rb:139:in`call’ actionpack (3.0.0) lib/action\_dispatch/routing/route\_set.rb:492:in `call' actionpack (3.0.0) lib/action_dispatch/middleware/ best_standards_support.rb:17:in`call’ actionpack (3.0.0) lib/action\_dispatch/middleware/head.rb:14:in `call' rack (1.2.1) lib/rack/methodoverride.rb:24:in`call’ actionpack (3.0.0) lib/action\_dispatch/middleware/params\_parser.rb: 21:in `call' actionpack (3.0.0) lib/action_dispatch/middleware/flash.rb:182:in`call’ actionpack (3.0.0) lib/action\_dispatch/middleware/session/ abstract\_store.rb:149:in `call' actionpack (3.0.0) lib/action_dispatch/middleware/cookies.rb:287:in`call’ activerecord (3.0.0) lib/active\_record/query\_cache.rb:32:in `block in call' activerecord (3.0.0) lib/active_record/connection_adapters/abstract/ query_cache.rb:28:in`cache’ activerecord (3.0.0) lib/active\_record/query\_cache.rb:12:in `cache' activerecord (3.0.0) lib/active_record/query_cache.rb:31:in`call’ activerecord (3.0.0) lib/active\_record/connection\_adapters/abstract/ connection\_pool.rb:355:in `call' actionpack (3.0.0) lib/action_dispatch/middleware/callbacks.rb:46:in`block in call’ activesupport (3.0.0) lib/active\_support/callbacks.rb:415:in `_run_call_callbacks' actionpack (3.0.0) lib/action_dispatch/middleware/callbacks.rb:44:in`call’ rack (1.2.1) lib/rack/sendfile.rb:107:in `call' actionpack (3.0.0) lib/action_dispatch/middleware/remote_ip.rb:48:in`call’ actionpack (3.0.0) lib/action\_dispatch/middleware/show\_exceptions.rb: 46:in `call' railties (3.0.0) lib/rails/rack/logger.rb:13:in`call’ rack (1.2.1) lib/rack/runtime.rb:17:in `call' activesupport (3.0.0) lib/active_support/cache/strategy/local_cache.rb: 72:in`call’ rack (1.2.1) lib/rack/lock.rb:11:in `block in call' :10:in`synchronize’ rack (1.2.1) lib/rack/lock.rb:11:in `call' actionpack (3.0.0) lib/action_dispatch/middleware/static.rb:30:in`call’ railties (3.0.0) lib/rails/application.rb:168:in `call' railties (3.0.0) lib/rails/application.rb:77:in`method\_missing’ railties (3.0.0) lib/rails/rack/log\_tailer.rb:14:in `call' rack (1.2.1) lib/rack/content_length.rb:13:in`call’ rack (1.2.1) lib/rack/handler/webrick.rb:52:in `service' /usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:111:in`service’ /usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run' /usr/local/lib/ruby/1.9.1/webrick/server.rb:183:in`block in start\_thread’ ---
**Author:** ![swengineer](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/97f17d/32.png) [@swengineer](https://www.ruby-forum.com/u/swengineer)\ **Post date:** [August 18, 2010, 3:08pm UTC](https://www.ruby-forum.com/t/undefined-method-eq-for-nil-nilclass/193479/6 "2010-08-18T15:08:50Z")
Thanks for your replies. The issue was as follows: As I mentioned, I’m walking through an example in “Head First Rails”. I have used the book’s version of “development.sqlite3” that contains some data. I used the name “advs” to create my application, and the table name in the database version I used happen to have the name “ads”. So, I just changed the name of the table to “advs” and it worked. Thanks.