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Class: ActiveRecord::Schema

Relationships & Source Files
Namespace Children
Modules:
Definition
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, Migration::Current, Migration
Instance Chain:
self, Definition, Migration::Current, Migration
Inherits: ActiveRecord::Migration::Current
Defined in: activerecord/lib/active_record/schema.rb

Overview

Allows programmers to programmatically define a schema in a portable DSL. This means you can define tables, indexes, etc. without using SQL directly, so your applications can more easily support multiple databases.

Usage:

ActiveRecord::Schema[7.0].define do
create_table :authors do |t|
  t.string :name, null: false
end

add_index :authors, :name, :unique

create_table :posts do |t|
  t.integer :author_id, null: false
  t.string :subject
  t.text :body
  t.boolean :private, default: false
end

add_index :posts, :author_id
end

Schema is only supported by database adapters that also support migrations, the two features being very similar.

Class Method Summary

Instance Method Summary

Definition - Included

#define

Migration::Current - Inherited

#change_table, #compatible_table_definition, #create_join_table, #create_table, #drop_table

Class Method Details

.[](version)

[ GitHub ] 

  


# File 'activerecord/lib/active_record/schema.rb', line 70



def self.[](version)
  @class_for_version ||= {}
  @class_for_version[version] ||= Class.new(Migration::Compatibility.find(version)) do
    include Definition
  end
end