From 14ddf8503ac4c63d48229563cf0f2b8d8a4256cf Mon Sep 17 00:00:00 2001
From: "nicholas a. evans" <nick@ekenosen.net>
Date: Mon, 20 Sep 2010 20:25:08 -0400
Subject: [PATCH] a simple gemification of the table_migrator plugin

---
 .gitignore                                  |  1 +
 init.rb                                     |  1 -
 lib/table_migration.rb                      |  3 +++
 lib/table_migrator.rb                       |  3 +++
 lib/table_migrator/base.rb                  |  5 ++++
 lib/table_migrator/change_table_strategy.rb |  3 +++
 lib/table_migrator/copy_engine.rb           |  2 ++
 lib/table_migrator/raw_sql_strategy.rb      |  2 ++
 table_migrator.gemspec                      | 26 +++++++++++++++++++++
 9 files changed, 45 insertions(+), 1 deletion(-)
 create mode 100644 .gitignore
 delete mode 100644 init.rb
 create mode 100644 table_migrator.gemspec

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c111b33
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.gem
diff --git a/init.rb b/init.rb
deleted file mode 100644
index 3c19a74..0000000
--- a/init.rb
+++ /dev/null
@@ -1 +0,0 @@
-# Include hook code here
diff --git a/lib/table_migration.rb b/lib/table_migration.rb
index 208036e..017776a 100644
--- a/lib/table_migration.rb
+++ b/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
diff --git a/lib/table_migrator.rb b/lib/table_migrator.rb
index d3a419b..1222878 100644
--- a/lib/table_migrator.rb
+++ b/lib/table_migrator.rb
@@ -1,3 +1,6 @@
+require 'table_migration'
+require 'table_migrator/base'
+
 module TableMigrator
   extend self
 
diff --git a/lib/table_migrator/base.rb b/lib/table_migrator/base.rb
index e68f7f1..3354c18 100644
--- a/lib/table_migrator/base.rb
+++ b/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
 
diff --git a/lib/table_migrator/change_table_strategy.rb b/lib/table_migrator/change_table_strategy.rb
index cf6556d..e74f615 100644
--- a/lib/table_migrator/change_table_strategy.rb
+++ b/lib/table_migrator/change_table_strategy.rb
@@ -1,3 +1,6 @@
+require 'active_record'
+require 'table_migrator/copy_strategy'
+
 module TableMigrator
 
   class ChangeTableStrategy < CopyStrategy
diff --git a/lib/table_migrator/copy_engine.rb b/lib/table_migrator/copy_engine.rb
index 3df2391..9ec9e29 100644
--- a/lib/table_migrator/copy_engine.rb
+++ b/lib/table_migrator/copy_engine.rb
@@ -1,3 +1,5 @@
+require 'active_record'
+
 module TableMigrator
   class CopyEngine
 
diff --git a/lib/table_migrator/raw_sql_strategy.rb b/lib/table_migrator/raw_sql_strategy.rb
index 8285068..d0be0ce 100644
--- a/lib/table_migrator/raw_sql_strategy.rb
+++ b/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
diff --git a/table_migrator.gemspec b/table_migrator.gemspec
new file mode 100644
index 0000000..a53bef6
--- /dev/null
+++ b/table_migrator.gemspec
@@ -0,0 +1,26 @@
+# -*- 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       = ["matt@freels.name"]
+  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