pg, extract schema definitions into separate file.

This mirrors the layout of abstract adapter and puts the definitions
inside the `PostgreSQL` namespace (no longer under the adapter namespace).

/cc @kares

1 files changed, 138 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/schema_definitions.rb b/activerecord/lib/active_record/connection_adapters/postgresql/schema_definitions.rb
new file mode 100644
index 0000000000..4fbbb6736e
--- /dev/null
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/schema_definitions.rb
@@ -0,0 +1,138 @@
+module ActiveRecord
+  module ConnectionAdapters
+    module PostgreSQL
+      module ColumnMethods
+        def xml(*args)
+          options = args.extract_options!
+          column(args[0], 'xml', options)
+        end
+
+        def tsvector(*args)
+          options = args.extract_options!
+          column(args[0], 'tsvector', options)
+        end
+
+        def int4range(name, options = {})
+          column(name, 'int4range', options)
+        end
+
+        def int8range(name, options = {})
+          column(name, 'int8range', options)
+        end
+
+        def tsrange(name, options = {})
+          column(name, 'tsrange', options)
+        end
+
+        def tstzrange(name, options = {})
+          column(name, 'tstzrange', options)
+        end
+
+        def numrange(name, options = {})
+          column(name, 'numrange', options)
+        end
+
+        def daterange(name, options = {})
+          column(name, 'daterange', options)
+        end
+
+        def hstore(name, options = {})
+          column(name, 'hstore', options)
+        end
+
+        def ltree(name, options = {})
+          column(name, 'ltree', options)
+        end
+
+        def inet(name, options = {})
+          column(name, 'inet', options)
+        end
+
+        def cidr(name, options = {})
+          column(name, 'cidr', options)
+        end
+
+        def macaddr(name, options = {})
+          column(name, 'macaddr', options)
+        end
+
+        def uuid(name, options = {})
+          column(name, 'uuid', options)
+        end
+
+        def json(name, options = {})
+          column(name, 'json', options)
+        end
+
+        def citext(name, options = {})
+          column(name, 'citext', options)
+        end
+      end
+
+      class ColumnDefinition < ActiveRecord::ConnectionAdapters::ColumnDefinition
+        attr_accessor :array
+      end
+
+      class TableDefinition < ActiveRecord::ConnectionAdapters::TableDefinition
+        include ColumnMethods
+
+        # Defines the primary key field.
+        # Use of the native PostgreSQL UUID type is supported, and can be used
+        # by defining your tables as such:
+        #
+        #   create_table :stuffs, id: :uuid do |t|
+        #     t.string :content
+        #     t.timestamps
+        #   end
+        #
+        # By default, this will use the +uuid_generate_v4()+ function from the
+        # +uuid-ossp+ extension, which MUST be enabled on your database. To enable
+        # the +uuid-ossp+ extension, you can use the +enable_extension+ method in your
+        # migrations. To use a UUID primary key without +uuid-ossp+ enabled, you can
+        # set the +:default+ option to +nil+:
+        #
+        #   create_table :stuffs, id: false do |t|
+        #     t.primary_key :id, :uuid, default: nil
+        #     t.uuid :foo_id
+        #     t.timestamps
+        #   end
+        #
+        # You may also pass a different UUID generation function from +uuid-ossp+
+        # or another library.
+        #
+        # Note that setting the UUID primary key default value to +nil+ will
+        # require you to assure that you always provide a UUID value before saving
+        # a record (as primary keys cannot be +nil+). This might be done via the
+        # +SecureRandom.uuid+ method and a +before_save+ callback, for instance.
+        def primary_key(name, type = :primary_key, options = {})
+          return super unless type == :uuid
+          options[:default] = options.fetch(:default, 'uuid_generate_v4()')
+          options[:primary_key] = true
+          column name, type, options
+        end
+
+        def citext(name, options = {})
+          column(name, 'citext', options)
+        end
+
+        def column(name, type = nil, options = {})
+          super
+          column = self[name]
+          column.array = options[:array]
+
+          self
+        end
+
+        private
+
+          def create_column_definition(name, type)
+            PostgreSQL::ColumnDefinition.new name, type
+          end
+      end
+
+      class Table < ActiveRecord::ConnectionAdapters::Table
+        include ColumnMethods
+      end
+    end
+  end
+end