Multiple database connection in Rails

Question

I\'m using active_delegate for multiple connection in Rails. Here I\'m using mysql as master_database for some models,and postgresql for some other models.

Problem i

Answer 1

might want to check out https://github.com/tchandy/octopus nowadays.

Answer 2

Another way:

class Abc < ActiveRecord::Base
  establish_connection Rails.configuration.database_configuration["test"]
end

Answer 3

I don't know about active_delegate, but I recently had to access different databases for work applications, and nothing really fit what I wanted. So I wrote something for myself, it's running in production applications as we speak.

Fixed Link connection_ninja

Answer 4

I've also had to connect to, and manage, two different databases, so I created a gem called secondbase: http://github.com/karledurante/secondbase

Answer 5

I highly suggest MyReplication plugin for MySQL adapter which helps you switch the connection at run-time in an elegant way:

User.using(:another_database) do
  u = User.all
end

https://github.com/minhnghivn/my_replication

Answer 6

I tried ur Sample,still getting error!!

superclass mismatch for class MysqlAdapter

I think ,the problem is with my database.yml file .Please check this file

database_mysql: 
  adapter: mysql
  database: project
  host: localhost
  username: root
  password: root
  port: 3306  

development:
  adapter: postgresql
  database: codex
  host: localhost
  username: postgres
  password: root
  port: 5432  

test:
  adapter: postgresql
  database: codex
  host: localhost
  username: postgres
  password: root
  port: 5432  

production:
  adapter: postgresql
  database: codex
  host: localhost
  username: postgres
  password: root
  port: 5432  

i start the mongrel in developemnet mode only.

here is my model superclass

$config = YAML.load_file(File.join(File.dirname(__FILE__),
   '../../config/database.yml'))

class MasterDatabase < ActiveRecord::Base
    self.abstract_class = true
    establish_connection $config['database_mysql']    
end 

Please correct me..