Dynamic table names.

rubyonrails-talk
1

In my current project we're using three databases and using joins inbetween them and when working on testing, it just did not seem to work to have multiple databases and using the set_table_name function since it hardcodes it to one database.

From just looking around at some code, I copied and pasted this

together, which I will use to extend my models from (There are three of them).

I could still use the one core database through the database.yml and only extend 2 of them.

Here is what I have. Example of one of the three.

In environment.rb I have PRODUCTS_DATABASE = "products"

lib/products_database.rb

module ARExtension   def self.included(base) #:nodoc:     base.extend(ClassMethods)   end

  module ClassMethods     def ai_table_name(value)       base_table_name = PRODUCTS_DATABASE + "." + value       if RAILS_ENV == "production"         set_table_name(base_table_name)       else         set_table_name(base_table_name + "_" + RAILS_ENV)       end     end   end end

class ProductsDatabase < ActiveRecord::Base   include ARExtension end

modules/testing.rb

class Testing < ProductsDatabase   ai_table_name "testings"   belongs_to :create_user, :foreign_key => "created_by", :class_name => "User"   belongs_to :update_user, :foreign_key => "updated_by", :class_name => "User" end

This will produce products.testings["","_test","_development] for the different RAILS_ENV

I was just wondering if there is a better solution out there, perhaps something within rails to do what I need it to do.

Thanks, Fredrik

2

Ok, I must have been a little confused this morning, That code would have to be modified to support.

products["","_test","_development].testings instead of products.testings["","_test","_development]

Thanks, Fredrik

3

This should do it.

module ARExtension   def self.included(base) #:nodoc:     base.extend(ClassMethods)   end

  module ClassMethods     def ai_table_name(value)       if RAILS_ENV == "production"         set_table_name(PRODUCTS_DATABASE + "." + value)       else         set_table_name(PRODUCTS_DATABASE + "_" + RAILS_ENV + "." + value )       end     end   end end

class ProductsDatabase < ActiveRecord::Base   include ARExtension end

Thanks, Fredrik