Add `default_index_type?` to the generic schema dumper doesn't have the knowledge about an index type

4 files changed, 13 insertions, 1 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
index 808de5daca..6b14a498df 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
@@ -509,6 +509,10 @@ module ActiveRecord
         result
       end
 
+      def default_index_type?(index) # :nodoc:
+        index.using.nil?
+      end
+
       private
 
         def initialize_type_map(m)
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
index f743c80372..14269b4570 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
@@ -651,6 +651,10 @@ module ActiveRecord
         !native_database_types[type].nil?
       end
 
+      def default_index_type?(index) # :nodoc:
+        index.using == :btree || super
+      end
+
       private
 
         def initialize_type_map(m)
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
index 5ce61183cd..36c9815547 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
@@ -402,6 +402,10 @@ module ActiveRecord
         @connection.server_version
       end
 
+      def default_index_type?(index) # :nodoc:
+        index.using == :btree || super
+      end
+
       private
 
         # See http://www.postgresql.org/docs/current/static/errcodes-appendix.html
diff --git a/activerecord/lib/active_record/schema_dumper.rb b/activerecord/lib/active_record/schema_dumper.rb
index cf4495326b..15533f0151 100644
--- a/activerecord/lib/active_record/schema_dumper.rb
+++ b/activerecord/lib/active_record/schema_dumper.rb
@@ -188,7 +188,7 @@ HEADER
         index_parts << "length: { #{format_options(index.lengths)} }" if index.lengths.present?
         index_parts << "order: { #{format_options(index.orders)} }" if index.orders.present?
         index_parts << "where: #{index.where.inspect}" if index.where
-        index_parts << "using: #{index.using.inspect}" if index.using && index.using != :btree
+        index_parts << "using: #{index.using.inspect}" if !@connection.default_index_type?(index)
         index_parts << "type: #{index.type.inspect}" if index.type
         index_parts << "comment: #{index.comment.inspect}" if index.comment
         index_parts