pg_power - ActiveRecord extension for PostgreSQL2012-09-06
UPDATE: pg_power gem was renamed to pg_saurus.
What you can do with pg_power?
- Use PostgresSQL schemas in your Rails project.
- Add comments to PostgreSQL database with Rails migrations.
- Use foreign keys (we imported foreigner functionality and made it schema aware).
- Use partial indexes.
- Add indexes concurrently.
You'll find enough documentation in README file.
Quick usage example
Assume you want to create tables
At first we need to create
class CreateDemographySchema < < ActiveRecord::Migration def change create_schema 'demography' end end
Now let's create tables:
class CreateDemographyLanguages < ActiveRecord::Migration def change # Create table `languages` in schema `demography` create_table "languages", :schema => "demography" do |t| t.string :name t.string :code, :limit => 2 end # Add PostgreSQL comments set_table_comment "demography.languages", "List of languages" set_column_comments "demography.languages", :name => "Full name of language in English", :code => "ISO 639-1 code" end end
class CreateDemographyContries < ActiveRecord::Migration def change # Create table `countries` in schema `demography` create_table "countries", :schema => "demography" do |t| t.string :name # In real life you likely would have many-to-many associaton t.integer :language_id end # Add PostgreSQL comments set_table_comment "demography.countries", "List of world countries" set_column_comments "demography.languages", :name => "Full name of country in English", :language_id => "Most popular language in the country" # Add foreign key and create index on demography.countries.language_id add_foreign_key("demography.countries", "demography.languages") end end
Great! Now we need to set table names in models to make ActiveRecord know that
these tables are located in
class Language < ActiveRecord::Base set_table_name "demography.languages" end
It will work. But I would recommend you to create module
Demography which would represent
demography schema and move those models to it. One more benefit is that you can define
schema prefix in module and models will use it build table name automatically.
module Demography def self.table_name_prefix 'demography.' end end
module Demography::Language # No need to use set_table_name anymore end
I hope you will enjoy pg_power. Let us know what you think!
Thanks. Sergey Potapov.