The ActiveWarehouse library provides classes and functions which help with building Data Warehouses using Rails.
To install ActiveWarehouse, add the gem to your Gemfile:
ActiveWarehouse comes with several generators. In the examples below, you can use either example and the results will be the same.
Creates a SalesFact class and a sales_facts table.
script/generate fact Sales script/generate fact sales
Creates a RegionDimension class and a region_dimension table.
script/generate dimension Region script/generate dimension region
Creates a RegionalSalesCube class.
script/generate cube RegionalSales script/generate cube regional_sales
Creates a CustomerHierarchyBridge class.
script/generate bridge CustomerHierarchy script/generate bridge customer_hierarchy
Creates an OrderDateDimension class which is represented by a view on top of the DateDimension.
script/generate dimension_view OrderDate Date script/generate dimension_view order_date date
The rules for naming are as follows:
- Fact classes and tables follow the typical Rails rules: classes are singular and tables are pluralized.
- Both the class and table name are suffixed by "_fact".
- Dimension classes and tables are both singular.
- Both the class name and the table name are suffixed by "_dimension".
- Cube class is singular. If a cube table is created it will also be singular.
- Bridge classes and tables are both singular.
- Both the class name and the table name are suffixed by "_bridge".
- Dimension View classes are singular. The underlying data structure is a view
- on top of an existing dimension.
- Both the class name and the view name are suffixed by "_dimension"
The ActiveWarehouse plugin does not directly handle Extract-Transform-Load processes, however the ActiveWarehouse ETL gem (installed separately) can help. To install it use:
gem install activewarehouse-etl
More information on the ETL process can be found at http://activewarehouse.rubyforge.org/etl