The project is in a healthy, maintained state
A tool to migrate, spy and seed relational databases



~> 0.20
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 Project Readme


DbAgent, a ruby tool to migrate, spy and seed relational databases

DbAgent helps managing a relational database lifecyle through three main tools:

  • Migrations: powered by Sequel, migrate as simply as rake db:migrate. Supports both superuser and normal user migrations.

  • Spy: using Shemaspy, get your database schema browsable at any moment, through a simple web interface.

  • Seed: maintain, install and flush database content as datasets, organized hierarchically in .json files. Very handy for automated tests, for instance.

Get started using Docker

DbAgent is expected to be used as its Docker agent, available as enspirit/dbagent. Simply mount migrations and data folders, and you're ready to go.

See the examples folder for details.

Available environment variables

  • DBAGENT_ROOT_FOLDER Main folder where data, migrations and viewpoints can be found
  • DBAGENT_LOGLEVEL Log level to use for dbagent messages (defaults to WARN)
  • DBAGENT_LOGSQL Low Sequel's SQL queries (defaults to no)
  • DBAGENT_ADAPTER Sequel's adapter (defaults to postgres)
  • DBAGENT_HOST Database server host (defaults to localhost)
  • DBAGENT_PORT Database server port (defaults to 5432)
  • DBAGENT_DB Database name (defaults to suppliers-and-parts)
  • DBAGENT_USER Database user (defaults to dbagent)
  • DBAGENT_PASSWORD Database password (defaults to dbagent)
  • DBAGENT_SOCKET Database server socket (if host/port is not used)
  • DBAGENT_SUPER_USER Superuser name (postgres only)
  • DBAGENT_SUPER_DB Superuser database (postgres only)
  • DBAGENT_SUPER_PASSWORD Superuser password (postgres only)
  • DBAGENT_VIEWPOINT Bmg viewpoint (class name) when using db:flush

Available rake tasks

The following rake tasks helps you managing the database. They must typically be executed on the docker container.

rake db:check-seeds      # Checks that all seeds can be installed correctly
rake db:create           # Creates an fresh new user & database (USE WITH CARE)
rake db:drop             # Drops the user & database (USE WITH CARE)
rake db:flush[to]        # Flushes the database as a particular data set
rake db:migrate          # Runs migrations on the current database
rake db:ping             # Pings the database, making sure everything's ready for migration
rake db:rebuild          # Rebuilds the database from scratch (USE WITH CARE)
rake db:repl             # Opens a database REPL
rake db:seed[from]       # Seeds the database with a particular data set
rake db:spy              # Dumps the schema documentation into database/schema
rake db:backup           # Makes a database backup to the backups folder
rake db:restore[match]   # Restore the last matching database backup file from backups folder
rake db:revive           # Shortcut for both db:restore and db:migrate
rake db:tables           # List tables with those with fewer dependencies first
rake db:dependencies[of] # List tables that depend of a given one

Available webservices

GET  /schema/                # Browser the database schema (requires a former `rake db:spy`)
POST /seeds/install?id=...   # Install a particular dataset, id is the name of a folder in `data` folder
POST /seeds/flush?id=...     # Flushes the current database content as a named dataset

Hacking on dbagent

Installing the library

bundle install

Preparing your computer

The tests require a valid PostgreSQL installation with the suppliers-and-parts database installed. A dbagent user would be needed on the PostgreSQL installation to bootstrap the process.

sudo su postgres -c 'createuser --createdb dbagent -P'

DbAgent tries to connect to the suppliers-and-parts with a dbagent/dbagent user/password pair by default. If you change the database name, user, or password please adapt the environment variables accordingly in the commands below.

Installing the example database

DBAGENT_ROOT_FOLDER=examples/suppliers-and-parts bundle exec rake db:create db:migrate db:seed['base']

Running test

To run the test you need to have Docker on your computer.


make test

Don't forget to delete created ressources for the tests bun running:

make clean


Please use github issues and pull requests for all questions, bug reports, and contributions. Don't hesitate to get in touch with us with an early code spike if you plan to add non trivial features.


This software is distributed by Enspirit SRL under a MIT Licence. Please contact Bernard Lambeau ( with any question.

Enspirit ( and Klaro App ( are both actively using and contributing to the library.