ActiveRecord::Annotate

ActiveRecord::Annotate is a simple ActiveRecord plugin for annotating your rails models. It is based on ActiveRecord::SchemaDumper (a core ActiveRecord class responsible for creating db/schema.rb) so the annotation format is very close to what you write in your migrations.

Trivial.

# Gemfile
group :development do
  # you don't want to annotate your models in production, do you?
  gem 'active_record-annotate', '~> 0.4'
end

$ bundle

Gem adds a simple db:annotate rake task - it just writes the annotation to the top of each model file in a comment block (magic encoding comment is preserved).

Once you install the gem into your application it hooks db:annotate to run after each db:migrate / db:rollback to keep the annotations in sync with the DB schema, but if you added a new model without migrating (or just accidentally messed up with something) you can always run the annotation process by hand:

$ rake db:annotate

This is what a common annotation looks like:

# create_table :documents, force: true do |t|
#   t.string   :title
#   t.text     :content
#   t.integer  :category_ids, array: true
#   t.datetime :created_at
#   t.datetime :updated_at
# end
#
# add_index :documents, [:category_ids], name: :index_documents_on_category_ids, using: :gin

class Document < ActiveRecord::Base
# ...

The annotation process can be configured via the ActiveRecord::Annotate.configure block which is handy to keep in the initializer.

You can generate the basic initializer with a built-in generator:

$ rails generate active_record:annotate:install

It creates an initializer at config/initializers/annotate.rb which contains descriptive comments about all settings (currently just one setting, yard).

• 0.1 Initial version with core functionality
• 0.1.1 Support for several models per table
• 0.2 Auto-annotation after db:migrate & db:rollback, basic output
• 0.3 Configuration and YARD code blocks support
• 0.4 Checking table existance before dumping
• 0.4.1 Several models per table fix
• 0.4.2 Initializer fix
• 0.4.3 Support for frozen_string_literal & warn_indent magic comments
• 0.4.4 Rails 5.2 support

• Cover everything with tests
• Write YARD docs

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request