Add change_column_comment and change_table_comment for `change_ta…

…ble` definition

activerecord/CHANGELOG.md

@@ -731,6 +731,17 @@
 
     *Tristan Fellows*
 
+*   Add `change_column_comment` and `change_table_comment` for `change_table` definition.
+
+    ```ruby
+    change_table :users do |t|
+      t.change_column_comment :login, "Username"
+      t.change_table_comment "Usual users"
+    end
+    ```
+
+    *Edem Topuzov*
+
 *   Allow for more complex hash arguments for `order` which mimics `where` in `ActiveRecord::Relation`.
 
     ```ruby

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

@@ -701,6 +701,8 @@ def add_column(name, type, **options)
     #     t.remove_index
     #     t.remove_check_constraint
     #     t.remove_timestamps
+    #     t.change_column_comment
+    #     t.change_table_comment
     #   end
     #
     class Table
@@ -941,6 +943,24 @@ def check_constraint_exists?(*args, **options)
         @base.check_constraint_exists?(name, *args, **options)
       end
 
+      # Changes the comment for a column.
+      #
+      #   t.change_column_comment(:state, "State column comment")
+      #
+      # See {connection.change_column_comment}[rdoc-ref:SchemaStatements#change_column_comment]
+      def change_column_comment(column_name, comment_or_changes)
+        @base.change_column_comment(name, column_name, comment_or_changes)
+      end
+
+      # Changes the comment for a table.
+      #
+      #   t.change_table_comment("Table comment")
+      #
+      # See {connection.change_table_comment}[rdoc-ref:SchemaStatements#change_table_comment]
+      def change_table_comment(comment_or_changes)
+        @base.change_table_comment(name, comment_or_changes)
+      end
+
       private
         def raise_on_if_exist_options(options)
           unrecognized_option = options.keys.find do |key|

activerecord/test/cases/migration/change_table_test.rb

@@ -339,6 +339,20 @@ def test_remove_check_constraint_removes_check_constraint
         end
       end
 
+      def test_change_column_comment
+        with_change_table do |t|
+          expect :change_column_comment, nil, [:delete_me, :bar, "Edited column comment"]
+          t.change_column_comment :bar, "Edited column comment"
+        end
+      end
+
+      def test_change_table_comment
+        with_change_table do |t|
+          expect :change_table_comment, nil, [:delete_me, "Edited table comment"]
+          t.change_table_comment "Edited table comment"
+        end
+      end
+
       def test_remove_column_with_if_exists_raises_error
         assert_raises(ArgumentError) do
           with_change_table do |t|