"Containerize All The Things!" - and yes, that means SQL DDL too!
Latest commit 76929c3 Apr 28, 2014 @dcunited001 dcunited001 updated to allow for app-wide default vars to be set in Skiima#setup
* these vars are used for interpolation
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Skiima: an ORM-Agnostic, Rails-Independent alternative to migrations.

Build Status

Using Skiima with ActiveRecord:

Adding generators soon


  1. Add skiima to your Gemfile
  2. Bundle Install
  3. Configure your database.yml
  • Ensure that users have the appropriate DDL permissions
  1. mkdir db/skiima
  2. touch db/skiima/dependencies.yml
  • Refer to the example below or $SKIIMA_GEM/spec/db/skiima/dependencies
  1. Set up a :test dependency group
  • include the groups of scripts you want to run after a fresh db clone
  • add bundle exec rake skiima:test:up to your CI setup script, after calling db:test:prepare
  • or add a rake task to your project that calls both db:test:prepare and skima:test:up
  • specify environment/groups with `bundle exec rake skiima:test:up[development,group_name]
  1. Set up a :default dependency group
  • include the groups of scripts you want to run during every deploy
  • because the scripts are run on each deploy, this rake task should only be used in certain instances
  • you should usually call Skiima.up & Skiima.down from a migration

Adding a new Skiima Script Group to your project

Again, generators coming soon to help automate this.

  1. Add a new migration to your Rails project. Refer to the sample below.
  2. mkdir db/skiima/$group_name
  3. touch db/skiima/$group_name/$type.$object_name.$db_type.$db_version.sql
  • $type => view/proc/function/etc
  • $object_name => identifies the script across multiple db providers & versions
  • $db_type => provider name (mysql/postgres)
  • $db_version => usually just 'current'
    • using $db_version, you can write scripts to support multiple versions of mysql, for example
    • Skiima compares the connected database's version to pull the correct script
    • or you can just configure skiima to prefer to load specific version of sql scripts
    • pass :version => 'version_name' to Skiima.up & Skiima.down
  1. Also add a corresponding drop script to run if:
  • either the up script is not reversible with a single drop statement
  • or if Skiima can not automatically drop that type object
  • see below for supported objects
  1. Now update db/skiima/dependencies.yml
  • Refer to the example below or $SKIIMA_GEM/spec/db/skiima/dependencies
  1. The script should be ready to use with Skiima.up & Skiima.down

Sample Skiima Migration:

class AddViewBackedModel < ActiveRecord::Migration
  def up
    Skiima.up(Rails.env, :group_name)

  def down
    Skiima.down(Rails.env, :group_name)

Sample Dependencies.yml:

      - view.script_name
      - view.script_name
  - script_group_name

# load/drop these script groups with:
#   `rake skiima:up` & `rake skiima:down`
# List migrations you have already squashed
# - IE migrations that you removed to rely on schema.rb
- script_group_a
- script_group_b
- script_group_c

# load/drop these script groups with:
#   `rake skiima:test:up` & `rake skiima:test:down`
# For tests/CI!
# List migrations that need to be run after a blank db is migrated
# - IE migrations that you squashed, if you are migrating from scratch on CI
# - If relying on db/schema.rb for CI, then list the groups you need for tests
- script_group_a
- script_group_b
- script_group_c

Running tests with your new Skiima Script Group

  1. bundle exec rake db:migrate
  2. bundle exec rake db:test:prepare
  3. bundle exec rake skiima:test:up
  4. bundle exec rake

Adding a view-backed model

# add a view named 'view_foo_report_on_bar'
class FooReportOnBar < ActiveRecord::Base
  set_table_name :view_foo_report_on_bar

  belongs_to :baz

Using Skiima with another ORM:

Support for Datamapper, Sequal, & JRuby providers coming soon.

Running Tests

  1. Setup Mysql & Postgres. I recommend copying Procfile.example and using foreman.
  2. Copy database.yml.example & set up users/passwords for your system
  • configure an existing user/password for postgresql_root & mysql_root
  • this user creates a user for the test databases in the rake setup tasks
  1. bundle install
  2. appraisal install
  3. Run test setup tasks
  • rake skiima:setup:db:postgresql
  • rake skiima:setup:db:mysql
    • you may need to remove the DROP USER command in spec/db/skiima/init_test_db/database.skiima_test.mysql.current.sql
  1. appraisal activerecord-3.2 rake
  • to test with activerecord-4.0, use that appraisal set
  • or appraisal rake to run them with all appraisal sets

Skiima Goals:

  • Provide a better way to integrate views and functions into Ruby applications.
  • Embeddable in gems to create DB independent extensions.
  • Avoid any unnecessary dependencies or complexity.

I was working on another project and added some cool features that relied on postgres views, rules, etc. And basically, I needed a place to put these scripts and a way to execute them in a specified order.

There are alot of cool tricks to use in ActiveRecord with sql objects other than tables. Not to mention there are performance benefits with the right schema. Not everything needs to happen at the application layer.

If you have any questions about how things work, look at the tests. If you have any suggestions, don't hesitate to contact me.

Supported Databases:


  • Schemas
  • Tables
  • Indexes
  • Views
  • Rules
  • Triggers(soon)
  • Functions(soon)


  • Tables
  • Views
  • Indexes
  • Triggers(soon)
  • Functions(soon)
  • Procs(soon)


Config Files

Skiima reads two yaml files: database.yml and dependencies.yml.

  • By default, database.yml goes in your APP_ROOT/config directory.
  • And similarly, dependencies.yml goes in APP_ROOT/db/skiima.


Skiima allows you to create groups of sql scripts to be executed during migrations. Each group of sql scripts requires its own folder inside db/skiima.

Adapter and Version

Since different databases have different capabilities and object types, you can trigger different scripts to run per adapter. Furthermore, you can execute different scripts for different versions of a database. You can also use this version tag if you want to package different sets of functionality.

Dependencies.yml Format

In the dependencies.yml configuration, add lines for each script in the format.

  • type.name.attr1.attr2

attr1 and attr2 allow you to define the target SQL object and other attributes that need to be passed on a per type basis. This is only used when Skiima drops your objects without a matching 'drop' script.

Filename Format

Inside each group folder, create sql files with the following format. These need to match the dependencies.yml configuration.

  • type.name.adapter.version.sql
  • type.name.adapter.version.drop.sql to override the default drop behavior.

Interpolation in Scripts

You can interpolate variables in your SQL Scripts and then pass in values at runtime with the :vars hash. The default character to use for interpolation is &, but this can be changed in the Module initialization. There are default vars that are substituted, such as &database.

Module Initialization

If you're using Rails, you can add a Skiima.setup block in an intializer file to set defaults. There are other ways to integrate Skiima into your project as well.

Skiima.setup do |config|
  config.root_path = Rails.root # changing
  config.config_path = 'config'
  config.scripts_path = 'db/skiima'
  config.locale = :en

Finally, in your Migrations

Skiima reads the specified groups from dependencies.yml and compiles a list of scripts to run. If you're using Rails, substitute :development with Rails.env

def up
  Skiima.up(:development, :group_one, :group_n, :vars => {:var_one => 'db_name'})

def down
  Skiima.down(:development, :group_one, :group_n, :vars => {:var_one => 'db_name'})

0.2.000 Updates:

  • Added a modified OpenStruct to manage configuration
  • Moved most classes to separate files

0.2.010 Updates:

  • Add Skiima::Db::Connector
  • Update Skiima::Db::Resolver
  • Add ActiveRecord::BaseConnector
  • Add PosgresqlConnector
  • Add Postresql Helpers
  • Add MysqlConnector
  • Add Mysql2Connector
  • Add Mysql Helpers

0.2.011 Updates:

  • Add Travis CI Config
  • Add Railties tasks
  • Updated dependencies.yml to allow for dependency groups
  • Updated Readme with examples

0.2.100 Planned:

  • Add JRuby Support
  • Add Appraisal to test Skiima with separate bundles
  • Add Coveralls?
  • Add Gemnasium?

0.3 Planned:

  • DataMapper Support
  • Sequel Support
  • Mongo Support?
  • Manage config's for other data providers? (Redis/etc)