Squirm::Rails lets you comfortably use Postgres stored procedures with Rails / Active Record.
It's built upon Squirm, a lightweight, Postgres-specific library for stored procedures.
rails new my_app cd my_app # edit config/database.yml - make it use Postgres # edit Gemfile: gem "squirm_rails", require: "squirm/rails" bundle rails generate squirm:install # Take a peek at the default stored procedures: # edit db/functions.sql # edit test/unit/stored_procedures/hello_world_test.rb bundle exec rake db:setup bundle exec rake db:migrate
Integration with Active Record
Squirm::Rails provides a
procedure class method in AR models, which adds method
wrappers around a stored procedure by the given name:
CREATE OR REPLACE FUNCTION say_my_name(_name text) RETURNS TEXT AS $$ BEGIN RETURN _name; END; $$ LANGUAGE 'PLPGSQL' class Person < ActiveRecord::Base procedure :say_my_name end
This method adds a class method with the same name as the stored procedure, so that the procedure can be invoked with any arguments:
Person.say_my_name("foo") #=> "foo"
It also adds an instance method with the same name as the procedure, which automatically pass any matching attribute names as stored procedure arguments:
person = Person.new name: "John" person.say_my_name #=> "John"
Migrations and Rake Tasks
Squirm::Rails defines stored procedures not in migrations, but rather in the
db/functions.sql file. Stored procedures are neither data nor structure, but
rather project code - just like your Ruby code. So you version it with Git or
another SCM, not with migrations.
You can reload the stored procedures any time with:
db:functions:load, as long
as you're careful to define them with
CREATE OR REPLACE. This Rake task is
db:schema:load, so your unit tests will pick up your modifications
automatically - most of the time there will be no need to manually reload the
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Copyright (c) 2011-2012 Norman Clarke and Business Vision S.A.
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