ActiveRecord :: ConnectionNotEstablished我想打开localhost：3000时出现此错误

Question

I am new to Web Development and have started learning Ruby on Rails from Lynda tutorial "Ruby on Rails Essential Training 4".

I got stuck when I was loading page from localhost:3000. I receive the following error every time I open localthost:3000:

ActiveRecord::ConnectionNotEstablished

Till this point I have installed all the gems as required in the tutorial and everything worked fine. Can somebody help me please? Thanks.

Answer 1

I was following this series too, you shouldn't run into this problem if you install rails 4.2.6.

You'll need to tweak this command to install version 4.2.6 if 5.0.0 comes out.

gem install rails --no-ri --no-rdoc

And it installed 4.2.6 on top of 4.0.0. I then deleted the simple_cms site folder and reinstalled it per the video and after editing the database.yml file which will be slightly different from is, I added my MySQL password to this section of the config -

  default: &default
  adapter: mysql2
  encoding: utf8
  pool: 5
  username: root
  password: **InsertYourMySQLPWHere**
  host: localhost

Start up the rails server and then you should get the welcome page.