ActiveRecord::Schema (original) (raw)

Active Record Schema

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.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

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

Methods

D

• define

M

• migrations_paths

Class Public methods

define(info={}, &block)

Eval the given block. All methods available to the current connection adapter are available within the block, so you can easily use the database definition DSL to build up your schema (create_table,add_index, etc.).

The info hash is optional, and if given is used to define metadata about the current schema (currently, only the schema’s version):

ActiveRecord::Schema.define(:version => 20380119000001) do ... end

Source: show

def self.define(info={}, &block) schema = new schema.instance_eval(&block)

unless info[:version].blank? initialize_schema_migrations_table assume_migrated_upto_version(info[:version], schema.migrations_paths) end end

Instance Public methods

migrations_paths()

Source: show

def migrations_paths ActiveRecord::Migrator.migrations_paths end