Please install mysql adapter 'gem install activerecord-mysql-adapter'

Question

I\'m having trouble finding a solution to this problem. I\'m getting the error:

Please install the mysql adapter: \'gem install activerecord-mysql-adapter\'
         


        

Answer 1

1) You need to update your config/database.yml file and change:

adapter: mysql

into

adapter: mysql2

2) You need to update your Gemfile and explicitly add activerecord-mysql2-adapter dependency there:

gem 'mysql2'
gem 'activerecord-mysql2-adapter'

Answer 2

I would say that change the commented information on top in database.yml to

# 
# Install the MYSQL driver
#   gem install mysql2
#
# Ensure the MySQL gem is defined in your Gemfile
#   gem 'mysql2'
#
# And be sure to use new-style password hashing:
#   http://dev.mysql.com/doc/refman/5.0/en/old-client.html

second: add " gem 'mysql2' " (what ever is inside the double quotation marks) to gemfile .

save everything, do bundle install. Hope that helps.

or it just could be a typo.

Answer 3

I am facing the same issue and getting same error when run command

gem install activerecord-mysql2-adapter

you need to install libmysqlclient-dev

sudo apt-get install libmysqlclient-dev

It works for me

Answer 4

It is possible that you have changed adapter to mysql2 for a certain environment only but are not passing the environment to the rake command.

E.g. I only changed mysql to mysql2 on the production environment but was running

rake generate_secret_token

when I changed it to the following it worked:

rake generate_secret_token RAILS_ENV=production