Class: Chicago::RakeTasks

Inherits:
Rake::TaskLib
  • Object
show all
Defined in:
lib/chicago/rake_tasks.rb

Overview

Rake tasks for a Chicago project.

To use, simply include:

Chicago::RakeTasks.new(db, schema)

in your project’s Rakefile.

Provides the following tasks:

db:create_null_records

creates all the null dimension records in db

db:create_etl_tables

defines the tables used for ETL batches and the like

db:write_migrations

writes the auto migrations to a “migrations” directory.

Instance Method Summary collapse

Constructor Details

#initialize(db, schema) ⇒ RakeTasks

Returns a new instance of RakeTasks.



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# File 'lib/chicago/rake_tasks.rb', line 23

def initialize(db, schema)
  @migration_dir = "migrations"
  @db = db
  @schema = schema
  define
end

Instance Method Details

#define ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Defines the rake tasks.



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# File 'lib/chicago/rake_tasks.rb', line 33

def define
  namespace :db do
    desc "Write Null dimension records"
    task :create_null_records do
      # TODO: replace this with proper logging.
      warn "Loading NULL records."
      @schema.dimensions.each {|dimension| dimension.create_null_records(@db) }
    end

    desc "Writes a migration file to change the database based on defined Facts & Dimensions"
    task :write_migrations do
      Database::MigrationFileWriter.new(@db, @migration_dir).
        write_migration_file(@schema)
    end
  end
end