# Rails Migration
http://guides.rubyonrails.org/migrations.html

## Migrations methods:
* add_column
* add_index
* change_column
* change_table
* create_table
* drop_table
* remove_column
* remove_index
* rename_column

Basic format
YYYYMMDDHHMMSS_create_products.rb

## Supported types

* :binary
* :boolean
* :date
* :datetime
* :decimal
* :float
* :integer
* :primary_key
* :string
* :text
* :time
* :timestamp
especial type:
* :references


## Commands to create migrations

``` 
$ rails generate model Product name:string description:text
$ rails generate migration AddPartNumberToProducts part_number:string
$ rails generate migration RemovePartNumberFromProducts part_number:string
$ rails generate migration AddDetailsToProducts part_number:string price:decimal
```