Merge pull request #45806 from adrianna-chang-shopify/ac-expose-schem…

…a-creation-objects

Expose `#schema_creation` methods

activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb

@@ -1442,6 +1442,12 @@ def use_foreign_keys?
         supports_foreign_keys? && foreign_keys_enabled?
       end
 
+      # Returns an instance of SchemaCreation, which can be used to visit a schema definition
+      # object and return DDL.
+      def schema_creation # :nodoc:
+        SchemaCreation.new(self)
+      end
+
       private
         def check_constraint_exists?(table_name, **options)
           check_constraint_for(table_name, **options).present?
@@ -1536,10 +1542,6 @@ def rename_column_indexes(table_name, column_name, new_column_name)
           end
         end
 
-        def schema_creation
-          SchemaCreation.new(self)
-        end
-
         def create_table_definition(name, **options)
           TableDefinition.new(self, name, **options)
         end

activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb

@@ -125,6 +125,10 @@ def table_alias_length
           256 # https://dev.mysql.com/doc/refman/en/identifiers.html
         end
 
+        def schema_creation # :nodoc:
+          MySQL::SchemaCreation.new(self)
+        end
+
         private
           CHARSETS_OF_4BYTES_MAXLEN = ["utf8mb4", "utf16", "utf16le", "utf32"]
 
@@ -150,10 +154,6 @@ def default_row_format
             @default_row_format
           end
 
-          def schema_creation
-            MySQL::SchemaCreation.new(self)
-          end
-
           def create_table_definition(name, **options)
             MySQL::TableDefinition.new(self, name, **options)
           end

activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb

@@ -759,11 +759,11 @@ def foreign_key_column_for(table_name) # :nodoc:
           super
         end
 
-        private
-          def schema_creation
-            PostgreSQL::SchemaCreation.new(self)
-          end
+        def schema_creation  # :nodoc:
+          PostgreSQL::SchemaCreation.new(self)
+        end
 
+        private
           def create_table_definition(name, **options)
             PostgreSQL::TableDefinition.new(self, name, **options)
           end

activerecord/lib/active_record/connection_adapters/sqlite3/schema_statements.rb

@@ -115,11 +115,11 @@ def create_schema_dumper(options)
           SQLite3::SchemaDumper.create(self, options)
         end
 
-        private
-          def schema_creation
-            SQLite3::SchemaCreation.new(self)
-          end
+        def schema_creation # :nodoc
+          SQLite3::SchemaCreation.new(self)
+        end
 
+        private
           def create_table_definition(name, **options)
             SQLite3::TableDefinition.new(self, name, **options)
           end