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
# 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
Changes the column‘s definition according to the new options. See TableDefinition#column for details of the options you can use.
t.change(:name, :string, :limit => 80) t.change(:description, :text)
# 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
t.change_default(:qualification, 'new') t.change_default(:authorized, 1)
# 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.
t.column(:name, :string)
# 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
t.index(:name)
t.index([:branch_id, :party_id], :unique => true)
t.index([:branch_id, :party_id], :unique => true, :name => 'by_branch_party')
# 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.
t.references(:goat) t.references(:goat, :polymorphic => true) t.belongs_to(:goat)
# 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.
t.remove(:qualification) t.remove(:qualification, :experience)
# 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
Removes the given index from the table.
t.remove_index :name
t.remove_index :column => :branch_id
t.remove_index :column => [:branch_id, :party_id]
t.remove_index :name => :by_branch_party
# 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.
t.remove_references(:goat) t.remove_references(:goat, :polymorphic => true) t.remove_belongs_to(:goat)
# 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.
t.remove_timestamps
# 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
Adds timestamps (created_at and updated_at) columns to the table. See SchemaStatements#add_timestamps
t.timestamps
# 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