RuntimeError with mysql2 and rails3 (bundler)
MysqlRuby on-RailsBundlerMysql Problem Overview
I get this error
`establish_connection': Please install the mysql2 adapter: `gem install activerecord-mysql2-adapter` (no such file to load -- active_record/connection_adapters/mysql2_adapter) (RuntimeError)
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/activerecord-
Here is dump of whole error and my config and gemfile.
Mysql Solutions
Solution 1 - Mysql
I was getting the same error while using rails 3.0.7 and mysql2 0.3.2. The solution, which I found here, is to use an older version of mysql2. Thus edit your gemfile to
gem 'mysql2', '< 0.3'
and run
bundle install
Solution 2 - Mysql
Also need to change adapter from mysql
to mysql2
in database.yml as said here
https://stackoverflow.com/questions/4297253/install-mysql2-gem-on-snow-leopard-for-rails-3-with-rvm
From:
development:
adapter: mysql
To:
development:
adapter: mysql2
Solution 3 - Mysql
Did you include the mysql2 gem in your gemfile instead of the old mysql gem, and ran bundle install afterwards?
Solution 4 - Mysql
If you're using rvm, and possibly added mysql2 outside of rvm, try these steps: Confirm that your Gemfile says:
gem 'mysql2'
or for Rails2.x:
gem 'mysql2', '~> 0.2.11'
then:
$ cd RAILS_ROOT
$ gem uninstall mysql2
Select gem to uninstall:
1. mysql2-0.2.11
2. mysql2-0.3.6
3. All versions
> 3 # select "All versions"
$ rvm gemset install mysql2
$ bundle install
Now rails should start properly.
Solution 5 - Mysql
This also fixed the issue I had with:
Please install the mysql2 adapter: `gem install activerecord-mysql2-adapter` (no such file to load -- active_record/connection_adapters/mysql2_adapter)
You actually need to run: gem install mysql2 and add the gem to your config.
Solution 6 - Mysql
just run "gem install mysql" also add the same in gemfile and run bundle. worked
Solution 7 - Mysql
If anybody still facing problem of installing mysql2 gem with rails 3 on Windows, then refer to the detailed steps of installation on -
http://rorguide.blogspot.com/2011/03/installing-mysql2-gem-on-ruby-192-and.html
Solution 8 - Mysql
I'm a beginner at ruby, rails, and linux. So if this solution did not work, I hold no responsibility :)
Step 1:
sudo gem uninstall mysql2
Step 2:
sudo gem install mysql -v 0.2.7
Start webrick, if the same problem still appears reinstall rails.
This solution works for me.
Solution 9 - Mysql
Same issue for me too. Upgraded to Rails 3.1.rc4 then downgraded to 3.0.3. Worked for me.
Solution 10 - Mysql
> as of 0.3.0, and ActiveRecord 3.1 - the ActiveRecord adapter has been > pulled out of this gem and into ActiveRecord itself. If you need to > use mysql2 with Rails versions < 3.1 make sure and specify gem > "mysql2", "~> 0.2.7" in your Gemfile
the missing file (no such file to load
) can be found in the pre 0.3.0 versions of mysql2.
quoted from the documentation of mysql2
Solution 11 - Mysql
I had the same error after upgrading from Ubuntu 11.10 to 12.04. This is how I fixed the problem:
gem uninstall mysql2
bundle
I think the key here is the 'native extensions' -- I suppose when I installed last, I was using a different version of mysql.
Installing mysql2 (0.3.11) with native extensions