Converting a Rails database from SQLite to PostgreSQL

 !     Detected sqlite3 gem which is not supported on Heroku.
! http://devcenter.heroku.com/articles/how-do-i-use-sqlite3-for-development
!
! Heroku push rejected, failed to compile Ruby/rails app

Why not?

How do I use PostgreSQL with my Rails app?

--database=postgresql
g̶e̶m̶ ̶'̶s̶q̶l̶i̶t̶e̶3̶'̶ # remove
gem 'pg' # add
# SQLite. Versions 3.8.0 and up are supported.
# gem install sqlite3
#
# Ensure the SQLite 3 gem is defined in your Gemfile
# gem 'sqlite3'
#
default: &default
adapter: sqlite3
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
timeout: 5000
development:
<<: *default
database: db/development.sqlite3

# 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: db/test.sqlite3
production:
<<: *default
database: db/production.sqlite3
# PostgreSQL. Versions 9.3 and up are supported.
#
# Install the pg driver:# gem install pg
# On macOS with Homebrew:# gem install pg -- --with-pg-config=/usr/local/bin/pg_config
# On macOS with MacPorts:
# gem install pg -- --with-pg-config=/opt/local/lib/postgresql84/bin/pg_config
# On Windows:
# gem install pg
# Choose the win32 build.
# Install PostgreSQL and put its /bin directory on your path.
#
# Configure Using Gemfile
# gem 'pg'
#
default: &default
adapter: postgresql
encoding: unicode
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
timeout: 5000
development:
<<: *default
database: *your_app_name*_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: *your_app_name*_test
production:
<<: *default
database: *your_app_name*_production
$ rake db:create
$ rake db:migrate
# if you have a seed file
$ rake db:seed

How to look at your databases

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