From 4734e4ed3181bf8c8dca959078b7e6295e702719 Mon Sep 17 00:00:00 2001
From: kennyj <kennyj@gmail.com>
Date: Wed, 10 Jul 2013 02:14:38 +0900
Subject: [PATCH] Migration dump UUID default functions to schema.rb. Fixes
 #10751.

---
 activerecord/CHANGELOG.md                                | 5 +++++
 .../connection_adapters/postgresql_adapter.rb            | 9 ++++++---
 activerecord/test/cases/adapters/postgresql/uuid_test.rb | 1 +
 3 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 1eb2f2d130a28..13c7bb85d01aa 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,8 @@
+*   Migration dump UUID default functions to schema.rb.
+    Fixes #10751.
+
+    *kennyj*
+
 *   Remove extra select and update queries on save/touch/destroy ActiveRecord model
     with belongs to reflection with option `touch: true`.
 
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
index 98126249df643..5a9d93ef57451 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
@@ -45,16 +45,18 @@ def postgresql_connection(config)
   module ConnectionAdapters
     # PostgreSQL-specific extensions to column definitions in a table.
     class PostgreSQLColumn < Column #:nodoc:
-      attr_accessor :array
+      attr_accessor :array, :default_function
       # Instantiates a new PostgreSQL column definition in a table.
       def initialize(name, default, oid_type, sql_type = nil, null = true)
         @oid_type = oid_type
+        default_value     = self.class.extract_value_from_default(default)
+        @default_function = default if !default_value && default && default =~ /.+\(.*\)/
         if sql_type =~ /\[\]$/
           @array = true
-          super(name, self.class.extract_value_from_default(default), sql_type[0..sql_type.length - 3], null)
+          super(name, default_value, sql_type[0..sql_type.length - 3], null)
         else
           @array = false
-          super(name, self.class.extract_value_from_default(default), sql_type, null)
+          super(name, default_value, sql_type, null)
         end
       end
 
@@ -435,6 +437,7 @@ def adapter_name
       def prepare_column_options(column, types)
         spec = super
         spec[:array] = 'true' if column.respond_to?(:array) && column.array
+        spec[:default] = "\"#{column.default_function}\"" if column.respond_to?(:default_function) && column.default_function
         spec
       end
 
diff --git a/activerecord/test/cases/adapters/postgresql/uuid_test.rb b/activerecord/test/cases/adapters/postgresql/uuid_test.rb
index b573d4880780c..20d7254b82d7a 100644
--- a/activerecord/test/cases/adapters/postgresql/uuid_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/uuid_test.rb
@@ -61,6 +61,7 @@ def test_schema_dumper_for_uuid_primary_key
     schema = StringIO.new
     ActiveRecord::SchemaDumper.dump(@connection, schema)
     assert_match(/\bcreate_table "pg_uuids", id: :uuid\b/, schema.string)
+    assert_match(/t\.uuid   "other_uuid", default: "uuid_generate_v4\(\)"/, schema.string)
   end
 end