Fix when assigning nested attributes raises "undefined method `to_sym' for nil:NilClass"
You might have a table without a primary key set in MySQL.
You can fix this by adding a primary key index to the guilty MySQL table, or by setting self.primary_key = "id" in your class definition.
Related, but different issue: Rails 2 does not find an association when it is named with a string instead of a symbol
Related cards:
How to fix "undefined method `name' for Array" error when running bundled commands on Ruby 1.8.7 + Rails 2.3
On recent/fresh installations of Ruby 1.8.7 you may encounter this error why calling any bundled binary (or just bundle exec):
/home/arne/.rvm/gems/ruby-1.8.7-p374@global/gems/rubygems-bundler-1.4.2/lib/rubygems-bundler/noexec.rb:75:in ...
Capistrano: Deployment issue undefined method `[]' for nil:NilClass
In newer passenger versions the output of passenger -v has changed. capistrano-passenger tries to parse the version and now causes the error undefined method '[]' for nil:NilClass. To fix this you only need to upgrade the `capistrano-passeng...
Fix for: "can't convert nil to String" when running "gem update --system"
When attempting to update RubyGems, depending on updates your previously performed, you might run into an error
ERROR: While executing gem ... (TypeError)
can't convert nil into String
Fix this by running
gem uninstall rubygems-upd...
How to fix: undefined method `specifications' (caused by RubyGems 1.8)
Sometimes, when running a rake task, RubyGems 1.8.5 raises an error:
rake aborted!
undefined method `specifications' for "/usr/lib/ruby/gems/1.8":String
This has been fixed since May 31 but is still not available as a new RubyGems versio...
Fix Rubygems binary error: undefined method `activate_bin_path' for Gem:Module (NoMethodError)
So you're getting an error like this:
undefined method `activate_bin_path' for Gem:Module (NoMethodError)
Here is what happened:
- You installed a recent version of Rubygems
- You installed some gems that install a binary (like `bun...
Fix: "undefined method `bytesize' for #<Array>"
I believe that when WEBrick has trouble bringing up your Rails application, the WEBrick component that is supposed to print you a pretty error message has a bug and sometimes fails with this message:
"undefined method `bytesize' for #<Array>"...
Fix Rubygems error: undefined method `source_index' for Gem:Module
You are probably using Ruby 1.8.7 with a too recent versions of Rubygems.
Downgrade your Rubygems to the latest version that works with 1.8.7.
See also
- [Fix Rubygems warning: Gem.source_index is deprecated, use Specifica...
Error when deploying 1.8.7 app: "NoMethodError: undefined method `select!' for ["zlib@openssh.com", "zlib"]:Array"
Fix: downgrade net-ssh to version 2.9.1.
Fix error: undefined method `desc' for #<Foo::Rake::Taskx1234>
Upgrade the offending gem. If you cannot or don't want to upgrade, lock rake to 0.8.7.
Configure RSpec to raise an error when stubbing a non-existing method
You can configure RSpec 3.3+ to raise an error when attempting to stub or mock a non-existing method. We strongly recommend to do this as non-verified stubs are a footgun.
You can enable this behavior by adding the following to your `spec_helper....