Setting variable depending upon RAILS_ENV - ruby-on-rails

Question

This is my current controller : 'trace_controller.rb'
rule_oms = Rule.new("localhost","root","","oms_local")
rule_warehouse=Rule.new("localhost","root","","warehouse_local")
rule_payment=Rule.new("localhost","root","","payment_local")
...
....
We have 2 different modes - Staging and Production. They have Hostname, Pwd, User, Database name which are unique.
How can I change these settings from environment.rb? Can you set variables depending upon them?
Depending upon environment, I get the hostname, pwd, user, db_name for all the different databases. Unlike most Rails app, I connect to several databases irrespective of the environment.
Any ideas what I should be doing? (Using latest version of Rails).

Answer 1

in config folder --> environments --> add another file with your environment name
by default, development.rb, , test.rb and production.rb are present.
add lets say qa_1.rb for your qa_1 environment.
Set your required config in this file, you can copy it from any of the existing environment files and change them as needed.
run your rails app with RAILS_ENV=qa_1
it will take the config from qa_1.rb file
you can set probably settings_logic gem, to set envirornment wise values
gem 'settingslogic'
Then in app/models/settings.rb add
class Settings < Settingslogic
source "#{Rails.root}/config/application.yml"
namespace Rails.env
end
and in /config/application.yml
set you environment specific data
defaults: &defaults
db: default_db
development:
user: dev_user
test:
user: test_user
production:
user: prod_user
db: prod_db
qa_1:
user: qa_1_user
db: qa_1_db
in database.yml also you can use
qa_1:
db: qa_db
user: user

Answer 2

I'm not sure what you're trying to achieve but if you place this in environment.rb, then I can only guess that you want some sort of global constant. If this is what you want, I suggest you create a file inside config/initializers called constants.rb then place the following there.
RULE_OMS = Rule.new("oms-#{Rails.env}")
RULE_WAREHOUSE = Rule.new("warehouse_#{Rails.env}")
RULE_PAYMENT = Rule.new("payment_#{Rails.env}")
then just call RULE_OMS anywhere in your app.

Answer 3

This is what worked for me -:
1) Creation of local.rb in config/environments (Simply a copy of development)
2) Defining the parameters for local in database.yml
3) Setting parameters in config/environment.rb
if Rails.env.local?
OMS_HOST="localhost"
OMS_DB="oms_local"
OMS_USER="root"
OMS_PWD=""
WAREHOUSE_HOST="localhost"
WAREHOUSE_DB="warehouse_local"
WAREHOUSE_USER="root"
WAREHOUSE_PWD=""
PAYMENT_HOST="localhost"
PAYMENT_DB="payment_local"
PAYMENT_USER="root"
PAYMENT_PWD=""
end
if Rails.env.development?
OMS_HOST="amt.com"
OMS_DB="oms_staging"
OMS_USER="user1"
OMS_PWD="xyz"
....
.....
4) In the trace_controller.rb, I used these constants to initialize my Rule model.
5) Add this in the .gitignore file, if you are using it.
6) Don't forget to restart the server.
Apologize for the way my question was framed as it was pretty unclear. Hope this answer will help somebody in the future.