Add reversible syntax for change_column_default

Passing `:from` and `:to` to `change_column_default` makes this command
reversible as user has defined its previous state.

So, instead of having the migration command as:

    change_column_default(:posts, :state, "draft")

They can write it as:

    change_column_default(:posts, :state, from: nil, to: "draft")

1 files changed, 10 insertions, 0 deletions

diff --git a/activerecord/test/cases/migration/command_recorder_test.rb b/activerecord/test/cases/migration/command_recorder_test.rb
index 90b7c6b38a..99f1dc65b0 100644
--- a/activerecord/test/cases/migration/command_recorder_test.rb
+++ b/activerecord/test/cases/migration/command_recorder_test.rb
@@ -169,6 +169,16 @@ module ActiveRecord
         end
       end
 
+      def test_invert_change_column_default_with_from_and_to
+        change = @recorder.inverse_of :change_column_default, [:table, :column, from: "old_value", to: "new_value"]
+        assert_equal [:change_column_default, [:table, :column, from: "new_value", to: "old_value"]], change
+      end
+
+      def test_invert_change_column_default_with_from_and_to_with_boolean
+        change = @recorder.inverse_of :change_column_default, [:table, :column, from: true, to: false]
+        assert_equal [:change_column_default, [:table, :column, from: false, to: true]], change
+      end
+
       def test_invert_change_column_null
         add = @recorder.inverse_of :change_column_null, [:table, :column, true]
         assert_equal [:change_column_null, [:table, :column, false]], add