Error loading the 'sqlite3' Active Record adapter. when I deploy in Heroku

Question

I have a problem when I am deploying in Heroku:

/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/rubygems_integration.rb:408:in `block (2 levels) in         


        

Answer 1

You should remove SQLite from your application and use Postgres in development, testing and production. There are many small incompatibilities between RDBMS's and you don't want to discover them when you push your app to production.

1. Install Postgres on the local system.

How to do this depends on your system. OS-X and Windows have simple installers. On Linux you would install it through your package manager.

2. Remove the sqlite gem.

# remove
gem 'sqlite3', '~> 1.3.6'

# add
gem 'pg', '~> 0.18.4' # check rubygems.org for the latest version

Run bundle update to regenerate the Bundle.lock.

3. Configure database.yml

default: &default
  adapter: postgresql
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  timeout: 5000

development:
  <<: *default
  database: 'my_app_development'

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  <<: *default
  database: 'my_app_test'

# On Heroku you don't need the production section as it provides everything through 
# ENV["DATABASE_URL"]
# Heroku sets pretty good defaults as well so YAGNI.

4. Commit and push