Dump indexes in `create_table` for generates SQL in one query

If the adapter supports indexes in create table, it generates SQL
in one query.

4 files changed, 52 insertions, 32 deletions

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 16ce131cf4..751c519c3e 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,10 @@
+*   Dump indexes in `create_table` for generates SQL in one query.
+
+    If the adapter supports indexes in create table, it generates SQL
+    in one query.
+
+    *Ryuta Kamizono*
+
 *   SQLite: Fix uniqueness validation when values exceed the column limit.
 
     SQLite doesn't impose length restrictions on strings, BLOBs, or numeric
diff --git a/activerecord/lib/active_record/schema_dumper.rb b/activerecord/lib/active_record/schema_dumper.rb
index c2662ec476..301718b874 100644
--- a/activerecord/lib/active_record/schema_dumper.rb
+++ b/activerecord/lib/active_record/schema_dumper.rb
@@ -179,11 +179,11 @@ HEADER
             tbl.puts
           end
 
+          indexes_in_create(table, tbl)
+
           tbl.puts "  end"
           tbl.puts
 
-          indexes(table, tbl)
-
           tbl.rewind
           stream.print tbl.read
         rescue => e
@@ -195,27 +195,12 @@ HEADER
         stream
       end
 
+      # Keep it for indexing materialized views
       def indexes(table, stream)
         if (indexes = @connection.indexes(table)).any?
           add_index_statements = indexes.map do |index|
-            statement_parts = [
-              "add_index #{remove_prefix_and_suffix(index.table).inspect}",
-              index.columns.inspect,
-              "name: #{index.name.inspect}",
-            ]
-            statement_parts << 'unique: true' if index.unique
-
-            index_lengths = (index.lengths || []).compact
-            statement_parts << "length: #{Hash[index.columns.zip(index.lengths)].inspect}" if index_lengths.any?
-
-            index_orders = index.orders || {}
-            statement_parts << "order: #{index.orders.inspect}" if index_orders.any?
-            statement_parts << "where: #{index.where.inspect}" if index.where
-            statement_parts << "using: #{index.using.inspect}" if index.using
-            statement_parts << "type: #{index.type.inspect}" if index.type
-            statement_parts << "comment: #{index.comment.inspect}" if index.comment
-
-            "  #{statement_parts.join(', ')}"
+            table_name = remove_prefix_and_suffix(index.table).inspect
+            "  add_index #{([table_name]+index_parts(index)).join(', ')}"
           end
 
           stream.puts add_index_statements.sort.join("\n")
@@ -223,6 +208,34 @@ HEADER
         end
       end
 
+      def indexes_in_create(table, stream)
+        if (indexes = @connection.indexes(table)).any?
+          index_statements = indexes.map do |index|
+            "    t.index #{index_parts(index).join(', ')}"
+          end
+          stream.puts index_statements.sort.join("\n")
+        end
+      end
+
+      def index_parts(index)
+        index_parts = [
+          index.columns.inspect,
+          "name: #{index.name.inspect}",
+        ]
+        index_parts << 'unique: true' if index.unique
+
+        index_lengths = (index.lengths || []).compact
+        index_parts << "length: #{Hash[index.columns.zip(index.lengths)].inspect}" if index_lengths.any?
+
+        index_orders = index.orders || {}
+        index_parts << "order: #{index.orders.inspect}" if index_orders.any?
+        index_parts << "where: #{index.where.inspect}" if index.where
+        index_parts << "using: #{index.using.inspect}" if index.using
+        index_parts << "type: #{index.type.inspect}" if index.type
+        index_parts << "comment: #{index.comment.inspect}" if index.comment
+        index_parts
+      end
+
       def foreign_keys(table, stream)
         if (foreign_keys = @connection.foreign_keys(table)).any?
           add_foreign_key_statements = foreign_keys.map do |foreign_key|
diff --git a/activerecord/test/cases/comment_test.rb b/activerecord/test/cases/comment_test.rb
index 298d171cdf..37d951ad88 100644
--- a/activerecord/test/cases/comment_test.rb
+++ b/activerecord/test/cases/comment_test.rb
@@ -103,8 +103,8 @@ class CommentTest < ActiveRecord::TestCase
     assert_match %r[t\.string\s+"obvious"\n], output
     assert_match %r[t\.string\s+"content",\s+comment: "Whoa, content describes itself!"], output
     assert_match %r[t\.integer\s+"rating",\s+comment: "I am running out of imagination"], output
-    assert_match %r[add_index\s+.+\s+comment: "\\\"Very important\\\" index that powers all the performance.\\nAnd it's fun!"], output
-    assert_match %r[add_index\s+.+\s+name: "idx_obvious",.+\s+comment: "We need to see obvious comments"], output
+    assert_match %r[t\.index\s+.+\s+comment: "\\\"Very important\\\" index that powers all the performance.\\nAnd it's fun!"], output
+    assert_match %r[t\.index\s+.+\s+name: "idx_obvious",.+\s+comment: "We need to see obvious comments"], output
   end
 
   def test_schema_dump_omits_blank_comments
diff --git a/activerecord/test/cases/schema_dumper_test.rb b/activerecord/test/cases/schema_dumper_test.rb
index 4498c96029..c7db77b426 100644
--- a/activerecord/test/cases/schema_dumper_test.rb
+++ b/activerecord/test/cases/schema_dumper_test.rb
@@ -171,24 +171,24 @@ class SchemaDumperTest < ActiveRecord::TestCase
   end
 
   def test_schema_dumps_index_columns_in_right_order
-    index_definition = standard_dump.split(/\n/).grep(/add_index.*companies/).first.strip
+    index_definition = standard_dump.split(/\n/).grep(/t\.index.*company_index/).first.strip
     if current_adapter?(:Mysql2Adapter, :PostgreSQLAdapter)
-      assert_equal 'add_index "companies", ["firm_id", "type", "rating"], name: "company_index", using: :btree', index_definition
+      assert_equal 't.index ["firm_id", "type", "rating"], name: "company_index", using: :btree', index_definition
     else
-      assert_equal 'add_index "companies", ["firm_id", "type", "rating"], name: "company_index"', index_definition
+      assert_equal 't.index ["firm_id", "type", "rating"], name: "company_index"', index_definition
     end
   end
 
   def test_schema_dumps_partial_indices
-    index_definition = standard_dump.split(/\n/).grep(/add_index.*company_partial_index/).first.strip
+    index_definition = standard_dump.split(/\n/).grep(/t\.index.*company_partial_index/).first.strip
     if current_adapter?(:PostgreSQLAdapter)
-      assert_equal 'add_index "companies", ["firm_id", "type"], name: "company_partial_index", where: "(rating > 10)", using: :btree', index_definition
+      assert_equal 't.index ["firm_id", "type"], name: "company_partial_index", where: "(rating > 10)", using: :btree', index_definition
     elsif current_adapter?(:Mysql2Adapter)
-      assert_equal 'add_index "companies", ["firm_id", "type"], name: "company_partial_index", using: :btree', index_definition
+      assert_equal 't.index ["firm_id", "type"], name: "company_partial_index", using: :btree', index_definition
     elsif current_adapter?(:SQLite3Adapter) && ActiveRecord::Base.connection.supports_partial_index?
-      assert_equal 'add_index "companies", ["firm_id", "type"], name: "company_partial_index", where: "rating > 10"', index_definition
+      assert_equal 't.index ["firm_id", "type"], name: "company_partial_index", where: "rating > 10"', index_definition
     else
-      assert_equal 'add_index "companies", ["firm_id", "type"], name: "company_partial_index"', index_definition
+      assert_equal 't.index ["firm_id", "type"], name: "company_partial_index"', index_definition
     end
   end
 
@@ -235,8 +235,8 @@ class SchemaDumperTest < ActiveRecord::TestCase
 
     def test_schema_dumps_index_type
       output = standard_dump
-      assert_match %r{add_index "key_tests", \["awesome"\], name: "index_key_tests_on_awesome", type: :fulltext}, output
-      assert_match %r{add_index "key_tests", \["pizza"\], name: "index_key_tests_on_pizza", using: :btree}, output
+      assert_match %r{t\.index \["awesome"\], name: "index_key_tests_on_awesome", type: :fulltext}, output
+      assert_match %r{t\.index \["pizza"\], name: "index_key_tests_on_pizza", using: :btree}, output
     end
   end