ActiveRecord::AdapterNotSpecified database configuration does not specify adapter

Question

When I use heroku open my web app works fine but when I\'m using rails s (localhost) I am running into this error:

ActiveRecord::AdapterNotSpecified database         


        

Answer 1

Why are you using a yml node reference in your database.yml?

You should have something like this:

#config/database.yml
development:
  adapter: mysql2
  encoding: utf8
  database: ****
  pool: 5
  username: ****
  password: ****
  host: ***.***.***.*** #-> only for third party db server

production:
  adapter: postgresql
  encoding: utf8
  database: ****
  pool: 5
  username: ****
  password: ****
  host: ***.***.***.*** #-> only for third party db server

---

Update

Rails runs using a database. You have to connect to a db to make it work, and to do that you have to define the different connection details in database.yml

To define the right information, you need to appreciate that Rails operates in several environments - development & production being the two most used

To get Rails working in your local (development) environment, you need to define the correct db details. This means you need a database to connect to - which is typically done setting up a local mysql / pgsql server

Bottom line is you connect to a db using:

• hostname
• username
• password
• db name

You need to define these in your config/database.yml file

If you have a server running in your local environment, your database.yml file will look like this:

#config/database.yml
development:
  adapter: mysql2
  encoding: utf8
  database: db_name
  pool: 5
  username: username
  password: password