lennhy/rails_migration_cheatsheet.md

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Created March 9, 2018 20:17

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Rails Migration - Cheatsheet

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rails_migration_cheatsheet.md

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

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