diff options
| -rw-r--r-- | activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb index 75032efe57..b764f26ec8 100644 --- a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb +++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb @@ -275,9 +275,29 @@ module ActiveRecord end end - # Represents a SQL table in an abstract way. - # Columns are stored as a ColumnDefinition in the +columns+ attribute. + # 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. class TableDefinition + # An array of ColumnDefinition objects, representing the column changes + # that have been defined. attr_accessor :columns def initialize(base) |