class TableDefinition

Ruby on Rails 2.2.3

Since v2.2.3

Available in: v2.2.3 v2.3.18 v3.0.20 v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with:

Represents the schema of an SQL table in an abstract way. This class provides methods for manipulating the schema representation.

Inside migration files, the t object in create_table and change_table is actually of this type:

class SomeMigration < ActiveRecord::Migration
  def self.up
    create_table :foo do |t|
      puts t.class  # => "ActiveRecord::ConnectionAdapters::TableDefinition"
    end
  end

  def self.down
    ...
  end
end

The table definitions The Columns are stored as a ColumnDefinition in the columns attribute.

Inherits from

Object

Attributes

ActiveRecord::ConnectionAdapters::TableDefinition#columns

Methods (defined here)

Private methods

(1) Implementation detail — not part of the public API.

# native

Methods (inherited)

From Object (32)

From ActionController::Caching (3)

From ActionController::Cookies (2)

# cookies
self. included

From ActionController::Flash (1)

self. included

From ActionController::HttpAuthentication::Basic::ControllerMethods (3)

From ActionController::RecordIdentifier (5)

From ActionController::RequestForgeryProtection (8)

From ActionController::Rescue (7)

From ActionController::Streaming (2)

# send_data
# send_file

From ActionController::Translation (4)

# l
# localize
# t
# translate

From ActiveRecord::Callbacks (14)

From ActiveRecord::Dirty (4)

From ActiveRecord::Locking::Pessimistic (1)

# lock!

From ActiveRecord::NamedScope (1)

self. included

From ActiveRecord::Serialization (5)

From ActiveRecord::Transactions (4)

From ActiveRecord::Validations (7)

From Benchmark (1)

self. realtime

From ActionController::Components::InstanceMethods (2)

From ActiveRecord::Locking::Optimistic::ClassMethods (7)

From ActiveRecord::NamedScope::ClassMethods (2)

# named_scope
# scopes

From ActiveRecord::Serialization::ClassMethods (1)

# json_class_name

From ActiveRecord::Validations::ClassMethods (13)

From ActiveSupport::Memoizable (1)

# memoize