Rails 3: Model.all => NoMethodError: undefined method 'accept' for nil:NilClass

Question

I\'m trying to build a Rails app around a pre-existing MySQL database. I created the rails project, set up the database.yml file properly and created one model, User, to cor

Answer 1

Just had the same issue. Narrowed it to being a MySQL related issue since it was happening only in staging environment (MySQL) and not in the developpment one (sqlite3). Fixed it by upgrading the mysql2 from version 0.2.7 to 0.3.11.

Answer 2

I had similar problem with MySQL after upgrading to rails 3.2.2.

This is what I did to fix it.

rvm gem install mysql2
In GemFile remove old MySQL gem and add - gem ‘mysql2' 
bundle install
bundle update activerecord-mysql2-adapter
bundle update mysql2

then restart your rails server.