From be1e0241f012f1151d2448b10e14b8b2eda26b84 Mon Sep 17 00:00:00 2001
From: Yves Senn <yves.senn@gmail.com>
Date: Thu, 18 Dec 2014 10:07:23 +0100
Subject: `force: :cascade` to recreate tables referenced by foreign-keys.

---
 .../test/cases/adapters/postgresql/uuid_test.rb    |  2 +-
 .../test/cases/migration/change_schema_test.rb     | 31 ++++++++++++++++++++++
 activerecord/test/cases/schema_dumper_test.rb      |  5 ++++
 3 files changed, 37 insertions(+), 1 deletion(-)

(limited to 'activerecord/test')

diff --git a/activerecord/test/cases/adapters/postgresql/uuid_test.rb b/activerecord/test/cases/adapters/postgresql/uuid_test.rb
index 7b7532993c..d6deb6fb1f 100644
--- a/activerecord/test/cases/adapters/postgresql/uuid_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/uuid_test.rb
@@ -130,7 +130,7 @@ class PostgresqlLargeKeysTest < ActiveRecord::TestCase
 
   def test_omg
     schema = dump_table_schema "big_serials"
-    assert_match "create_table \"big_serials\", id: :bigserial, force: true", schema
+    assert_match "create_table \"big_serials\", id: :bigserial", schema
   end
 
   def teardown
diff --git a/activerecord/test/cases/migration/change_schema_test.rb b/activerecord/test/cases/migration/change_schema_test.rb
index d91e7142b3..d774cfebc4 100644
--- a/activerecord/test/cases/migration/change_schema_test.rb
+++ b/activerecord/test/cases/migration/change_schema_test.rb
@@ -415,5 +415,36 @@ module ActiveRecord
         yield
       end
     end
+
+    if ActiveRecord::Base.connection.supports_foreign_keys?
+      class ChangeSchemaWithDependentObjectsTest < ActiveRecord::TestCase
+        self.use_transactional_fixtures = false
+
+        setup do
+          @connection = ActiveRecord::Base.connection
+          @connection.create_table :trains
+          @connection.create_table(:wagons) { |t| t.references :train }
+          @connection.add_foreign_key :wagons, :trains
+        end
+
+        teardown do
+          [:wagons, :trains].each do |table|
+            @connection.drop_table(table) if @connection.table_exists?(table)
+          end
+        end
+
+        def test_create_table_with_force_cascade_drops_dependent_objects
+          skip "MySQL > 5.5 does not drop dependent objects with DROP TABLE CASCADE" if current_adapter?(:MysqlAdapter, :Mysql2Adapter)
+          # can't re-create table referenced by foreign key
+          assert_raises(ActiveRecord::StatementInvalid) do
+            @connection.create_table :trains, force: true
+          end
+
+          # can recreate referenced table with force: :cascade
+          @connection.create_table :trains, force: :cascade
+          assert_equal [], @connection.foreign_keys(:wagons)
+        end
+      end
+    end
   end
 end
diff --git a/activerecord/test/cases/schema_dumper_test.rb b/activerecord/test/cases/schema_dumper_test.rb
index 01c686f934..a094136766 100644
--- a/activerecord/test/cases/schema_dumper_test.rb
+++ b/activerecord/test/cases/schema_dumper_test.rb
@@ -40,6 +40,11 @@ class SchemaDumperTest < ActiveRecord::TestCase
     assert_no_match %r{create_table "schema_migrations"}, output
   end
 
+  def test_schema_dump_uses_force_cascade_on_create_table
+    output = dump_table_schema "authors"
+    assert_match %r{create_table "authors", force: :cascade}, output
+  end
+
   def test_schema_dump_excludes_sqlite_sequence
     output = standard_dump
     assert_no_match %r{create_table "sqlite_sequence"}, output
-- 
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