Class ActiveRecord::ConnectionAdapters::Table
In: vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
Parent: Object

Represents a SQL table in an abstract way for updating a table. Also see TableDefinition and SchemaStatements#create_table

Available transformations are:

  change_table :table do |t|
    t.column
    t.index
    t.timestamps
    t.change
    t.change_default
    t.rename
    t.references
    t.belongs_to
    t.string
    t.text
    t.integer
    t.float
    t.decimal
    t.datetime
    t.timestamp
    t.time
    t.date
    t.binary
    t.boolean
    t.remove
    t.remove_references
    t.remove_belongs_to
    t.remove_index
    t.remove_timestamps
  end

Methods

Public Class methods

[Source]

     # File vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 551
551:       def initialize(table_name, base)
552:         @table_name = table_name
553:         @base = base
554:       end

Public Instance methods

belongs_to(*args)

Alias for references

Changes the column‘s definition according to the new options. See TableDefinition#column for details of the options you can use.

Examples
 t.change(:name, :string, :limit => 80)
 t.change(:description, :text)

[Source]

     # File vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 591
591:       def change(column_name, type, options = {})
592:         @base.change_column(@table_name, column_name, type, options)
593:       end

Sets a new default value for a column. See SchemaStatements#change_column_default

Examples
 t.change_default(:qualification, 'new')
 t.change_default(:authorized, 1)

[Source]

     # File vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 599
599:       def change_default(column_name, default)
600:         @base.change_column_default(@table_name, column_name, default)
601:       end

Adds a new column to the named table. See TableDefinition#column for details of the options you can use.

Example
Creating a simple column
 t.column(:name, :string)

[Source]

     # File vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 561
561:       def column(column_name, type, options = {})
562:         @base.add_column(@table_name, column_name, type, options)
563:       end

Adds a new index to the table. column_name can be a single Symbol, or an Array of Symbols. See SchemaStatements#add_index

Examples
Creating a simple index
 t.index(:name)
Creating a unique index
 t.index([:branch_id, :party_id], :unique => true)
Creating a named index
 t.index([:branch_id, :party_id], :unique => true, :name => 'by_branch_party')

[Source]

     # File vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 575
575:       def index(column_name, options = {})
576:         @base.add_index(@table_name, column_name, options)
577:       end

Adds a reference. Optionally adds a type column. references and belongs_to are acceptable.

Examples
 t.references(:goat)
 t.references(:goat, :polymorphic => true)
 t.belongs_to(:goat)

[Source]

     # File vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 646
646:       def references(*args)
647:         options = args.extract_options!
648:         polymorphic = options.delete(:polymorphic)
649:         args.each do |col|
650:           @base.add_column(@table_name, "#{col}_id", :integer, options)
651:           @base.add_column(@table_name, "#{col}_type", :string, polymorphic.is_a?(Hash) ? polymorphic : options) unless polymorphic.nil?
652:         end
653:       end

Removes the column(s) from the table definition.

Examples
 t.remove(:qualification)
 t.remove(:qualification, :experience)

[Source]

     # File vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 607
607:       def remove(*column_names)
608:         @base.remove_column(@table_name, column_names)
609:       end
remove_belongs_to(*args)

Alias for remove_references

Removes the given index from the table.

Examples
Remove the suppliers_name_index in the suppliers table
  t.remove_index :name
Remove the index named accounts_branch_id_index in the accounts table
  t.remove_index :column => :branch_id
Remove the index named accounts_branch_id_party_id_index in the accounts table
  t.remove_index :column => [:branch_id, :party_id]
Remove the index named by_branch_party in the accounts table
  t.remove_index :name => :by_branch_party

[Source]

     # File vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 622
622:       def remove_index(options = {})
623:         @base.remove_index(@table_name, options)
624:       end

Removes a reference. Optionally removes a type column. remove_references and remove_belongs_to are acceptable.

Examples
 t.remove_references(:goat)
 t.remove_references(:goat, :polymorphic => true)
 t.remove_belongs_to(:goat)

[Source]

     # File vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 662
662:       def remove_references(*args)
663:         options = args.extract_options!
664:         polymorphic = options.delete(:polymorphic)
665:         args.each do |col|
666:           @base.remove_column(@table_name, "#{col}_id")
667:           @base.remove_column(@table_name, "#{col}_type") unless polymorphic.nil?
668:         end
669:       end

Removes the timestamp columns (created_at and updated_at) from the table.

Example
 t.remove_timestamps

[Source]

     # File vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 629
629:       def remove_timestamps
630:         @base.remove_timestamps(@table_name)
631:       end

Renames a column.

Example
 t.rename(:description, :name)

[Source]

     # File vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 636
636:       def rename(column_name, new_column_name)
637:         @base.rename_column(@table_name, column_name, new_column_name)
638:       end

Adds timestamps (created_at and updated_at) columns to the table. See SchemaStatements#add_timestamps

Example
 t.timestamps

[Source]

     # File vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 582
582:       def timestamps
583:         @base.add_timestamps(@table_name)
584:       end

[Validate]