ActiveRecord::AdapterNotSpecified database configuration does not specify adapter

For you app to work locally you need to:

1. Install Postgresql on your machine
2. Create a database for your development needs (let’s call it my_app_development)

3. Change your database.yml to:

   default: &default
     adapter: postgresql
     encoding: unicode
     # For details on connection pooling, see rails configuration guide
     # http://guides.rubyonrails.org/configuring.html#database-pooling
     pool: 5
   
   development:
     <<: *default
     database: my_app_development
   

4. run rake db:migrate