Ruby - ActiveRecord::ConnectionNotEstablished

Question

I am rather new to Ruby and have been following along with the book \"Ruby On Rails 3 Tutorial - Learn Ruby by Example - by Michael Hartl\". I am currently in Chapter 3 whic

Answer 1

i am new to it but this might be pretty helpful(if you are in development just check development leave production and test environments):

1. Create a database and give it a name.

2. Open up .config/database.yml

   adapter: mysql2

   database: specify_your_newly_created_database #check if its automatically updated or not

   pool: 5

   username: your designated username.

   password: your designated password.

   host: localhost

3. $ rails server

   => Booting WEBrick

   => Rails 3.2.9 application starting in development on http:// 0. 0. 0 .0 :3000

   => Call with -d to detach

   => Ctrl-C to shutdown server

   [2012-12-12 23:31:50] INFO WEBrick 1.3.1

   [2012-12-12 23:31:50] INFO ruby 1.9.3 (2012-11-10) [i386-mingw32]

   [2012-12-12 23:31:50] INFO WEBrick::HTTPServer#start: pid=4068 port=3000

   Started GET "/demo/index" for 127.0.0.1 at 2012-12-12 23:32:40 +0545

   Connecting to database specified by database.yml

   Processing by DemoController#index as HTML

   Rendered demo/index.html.erb within layouts/application (0.0ms)

   Compiled demo.css (46ms) (pid 4068)

and so on...........

if your'e just trying to solve the ActiceRecord then this will solve the problem and display your first hello page. This is the problem that occurs sometime since rails searches for the database though we have nothing to do with database when dealing with the first hello page, so just check it once if not the we will solve it together. Cheers!