gemified table_migrator

.gitignore

@@ -0,0 +1 @@
+*.gem

lib/table_migration.rb

@@ -1,3 +1,6 @@
+require 'active_record'
+require 'table_migrator/base'
+
 class TableMigration < ActiveRecord::Migration
   class << self
     attr_reader :table_migrator

lib/table_migrator.rb

@@ -1,3 +1,6 @@
+require 'table_migration'
+require 'table_migrator/base'
+
 module TableMigrator
   extend self
 

lib/table_migrator/base.rb

@@ -1,3 +1,8 @@
+require 'active_record'
+require 'table_migrator/copy_engine'
+require 'table_migrator/change_table_strategy'
+require 'table_migrator/raw_sql_strategy'
+
 module TableMigrator
   class Base
 

lib/table_migrator/change_table_strategy.rb

@@ -1,3 +1,6 @@
+require 'active_record'
+require 'table_migrator/copy_strategy'
+
 module TableMigrator
 
   class ChangeTableStrategy < CopyStrategy

lib/table_migrator/copy_engine.rb

@@ -1,3 +1,5 @@
+require 'active_record'
+
 module TableMigrator
   class CopyEngine
 

lib/table_migrator/raw_sql_strategy.rb

@@ -1,3 +1,5 @@
+require 'table_migrator/copy_strategy'
+
 module TableMigrator
   class RawSqlStrategy < CopyStrategy
     attr_accessor :base_copy_query, :schema_changes

table_migrator.gemspec

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+# -*- encoding: utf-8 -*-
+
+Gem::Specification.new do |s|
+  s.name        = "table_migrator"
+  s.version     = '0.0.1.dev'
+  s.platform    = Gem::Platform::RUBY
+  s.authors     = ["Matt Freels", "Rohith Ravi", "Rick Olson",]
+  s.email       = ["[email protected]"]
+  s.homepage    = "http://github.com/freels/table_migrator"
+  s.summary     = "Zero-downtime table migration in MySQL"
+  s.description = <<-EOF
+    TableMigrator is a method for altering large MySQL tables while incurring
+    as little downtime as possible.  First, we create a new table like the
+    original one, and then apply one or more ALTER TABLE  statements to the
+    unused, empty table. Second we copy all rows from the original table into
+    the new one.  All this time, reads and writes are going to the original
+    table, so the two tables are not consistent. Finally, we acquire a write
+    lock on the original table before copying over all new/changed rows, and
+    swapping in the new table.
+  EOF
+
+  s.add_dependency "activerecord", "~>2.3.5"
+
+  s.files        = Dir.glob("lib/**/*") +%w[README.md]
+  s.require_path = 'lib'
+end