diff options
Diffstat (limited to 'guides/source/active_record_migrations.md')
| -rw-r--r-- | guides/source/active_record_migrations.md | 38 |
1 files changed, 19 insertions, 19 deletions
diff --git a/guides/source/active_record_migrations.md b/guides/source/active_record_migrations.md index 5aa5dc4f60..b9bb051e7e 100644 --- a/guides/source/active_record_migrations.md +++ b/guides/source/active_record_migrations.md @@ -35,7 +35,7 @@ history to the latest version. Active Record will also update your Here's an example of a migration: ```ruby -class CreateProducts < ActiveRecord::Migration +class CreateProducts < ActiveRecord::Migration[0.0] def change create_table :products do |t| t.string :name @@ -72,7 +72,7 @@ If you wish for a migration to do something that Active Record doesn't know how to reverse, you can use `reversible`: ```ruby -class ChangeProductsPrice < ActiveRecord::Migration +class ChangeProductsPrice < ActiveRecord::Migration[0.0] def change reversible do |dir| change_table :products do |t| @@ -87,7 +87,7 @@ end Alternatively, you can use `up` and `down` instead of `change`: ```ruby -class ChangeProductsPrice < ActiveRecord::Migration +class ChangeProductsPrice < ActiveRecord::Migration[0.0] def up change_table :products do |t| t.change :price, :string @@ -129,7 +129,7 @@ $ bin/rails generate migration AddPartNumberToProducts This will create an empty but appropriately named migration: ```ruby -class AddPartNumberToProducts < ActiveRecord::Migration +class AddPartNumberToProducts < ActiveRecord::Migration[0.0] def change end end @@ -146,7 +146,7 @@ $ bin/rails generate migration AddPartNumberToProducts part_number:string will generate ```ruby -class AddPartNumberToProducts < ActiveRecord::Migration +class AddPartNumberToProducts < ActiveRecord::Migration[0.0] def change add_column :products, :part_number, :string end @@ -162,7 +162,7 @@ $ bin/rails generate migration AddPartNumberToProducts part_number:string:index will generate ```ruby -class AddPartNumberToProducts < ActiveRecord::Migration +class AddPartNumberToProducts < ActiveRecord::Migration[0.0] def change add_column :products, :part_number, :string add_index :products, :part_number @@ -180,7 +180,7 @@ $ bin/rails generate migration RemovePartNumberFromProducts part_number:string generates ```ruby -class RemovePartNumberFromProducts < ActiveRecord::Migration +class RemovePartNumberFromProducts < ActiveRecord::Migration[0.0] def change remove_column :products, :part_number, :string end @@ -196,7 +196,7 @@ $ bin/rails generate migration AddDetailsToProducts part_number:string price:dec generates ```ruby -class AddDetailsToProducts < ActiveRecord::Migration +class AddDetailsToProducts < ActiveRecord::Migration[0.0] def change add_column :products, :part_number, :string add_column :products, :price, :decimal @@ -215,7 +215,7 @@ $ bin/rails generate migration CreateProducts name:string part_number:string generates ```ruby -class CreateProducts < ActiveRecord::Migration +class CreateProducts < ActiveRecord::Migration[0.0] def change create_table :products do |t| t.string :name @@ -239,7 +239,7 @@ $ bin/rails generate migration AddUserRefToProducts user:references generates ```ruby -class AddUserRefToProducts < ActiveRecord::Migration +class AddUserRefToProducts < ActiveRecord::Migration[0.0] def change add_reference :products, :user, index: true, foreign_key: true end @@ -257,7 +257,7 @@ $ bin/rails g migration CreateJoinTableCustomerProduct customer product will produce the following migration: ```ruby -class CreateJoinTableCustomerProduct < ActiveRecord::Migration +class CreateJoinTableCustomerProduct < ActiveRecord::Migration[0.0] def change create_join_table :customers, :products do |t| # t.index [:customer_id, :product_id] @@ -281,7 +281,7 @@ $ bin/rails generate model Product name:string description:text will create a migration that looks like this ```ruby -class CreateProducts < ActiveRecord::Migration +class CreateProducts < ActiveRecord::Migration[0.0] def change create_table :products do |t| t.string :name @@ -309,7 +309,7 @@ $ bin/rails generate migration AddDetailsToProducts 'price:decimal{5,2}' supplie will produce a migration that looks like this ```ruby -class AddDetailsToProducts < ActiveRecord::Migration +class AddDetailsToProducts < ActiveRecord::Migration[0.0] def change add_column :products, :price, :decimal, precision: 5, scale: 2 add_reference :products, :supplier, polymorphic: true, index: true @@ -563,7 +563,7 @@ to reverse. You can use `reversible` to specify what to do when running a migration and what else to do when reverting it. For example: ```ruby -class ExampleMigration < ActiveRecord::Migration +class ExampleMigration < ActiveRecord::Migration[0.0] def change create_table :distributors do |t| t.string :zipcode @@ -616,7 +616,7 @@ is wise to perform the transformations in precisely the reverse order they were made in the `up` method. The example in the `reversible` section is equivalent to: ```ruby -class ExampleMigration < ActiveRecord::Migration +class ExampleMigration < ActiveRecord::Migration[0.0] def up create_table :distributors do |t| t.string :zipcode @@ -659,7 +659,7 @@ You can use Active Record's ability to rollback migrations using the `revert` me ```ruby require_relative '20121212123456_example_migration' -class FixupExampleMigration < ActiveRecord::Migration +class FixupExampleMigration < ActiveRecord::Migration[0.0] def change revert ExampleMigration @@ -677,7 +677,7 @@ is later decided it would be best to use Active Record validations, in place of the `CHECK` constraint, to verify the zipcode. ```ruby -class DontUseConstraintForZipcodeValidationMigration < ActiveRecord::Migration +class DontUseConstraintForZipcodeValidationMigration < ActiveRecord::Migration[0.0] def change revert do # copy-pasted code from ExampleMigration @@ -841,7 +841,7 @@ Several methods are provided in migrations that allow you to control all this: For example, this migration: ```ruby -class CreateProducts < ActiveRecord::Migration +class CreateProducts < ActiveRecord::Migration[0.0] def change suppress_messages do create_table :products do |t| @@ -1015,7 +1015,7 @@ to add or modify data. This is useful in an existing database that can't be dest and recreated, such as a production database. ```ruby -class AddInitialProducts < ActiveRecord::Migration +class AddInitialProducts < ActiveRecord::Migration[0.0] def up 5.times do |i| Product.create(name: "Product ##{i}", description: "A product.") |