Rails: No connection pool for ActiveRecord::Base

Question

I\'m trying to use rails 4.2.6 to develop an app. I\'m trying to use postgres for database. Server starts fine but when I try loading a page it throws this \"No connection p

Answer 1

Rails 5

New app

Using Postgresql for both test and development

Specs run, so Rails can connect to Postgresql

But when I started the web app, I got "No connection pool with id primary found."

Ran 'bin/rails db:migrate:reset' and restarted the app. It worked. No idea why.

database.yml:

    development:
      adapter: postgresql
      encoding: unicode
      database: rails5_development
      pool: 5
      username: foo
      password: bar
      host: localhost
      port: 5432

    test:
      adapter: postgresql
      encoding: unicode
      database: rails5_test
      pool: 5
      username: foo
      password: bar
      host: localhost
      port: 5432