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Make sure you have Ruby Version 2.7.0 or greater You will have to remove the default SQLite3 Active Record

#remove `SQLite3` from Gemfile
gem 'sqlite3', '~> 1.4'

You will need to add the PostgreSQL Gem

#add `pg` to Gemfile
gem "pg"

Navigate to /config/database.yml and add the following contents Rails will create a database, so use a database name not currently in Tembo Postgres

adapter: postgresql
encoding: unicode
database: your_postgres_table_name
pool: 5
host: your_tembo_host_name
username: your_postgres_username
password: your_postgres_password

Now you can build your project

bundle install

Then, create the Active Record

rails db:create

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