Gem breaks with rails 7.1

[skatkov]

Description

This gem breaks for rails HEAD version (e.g. 7.1), instead of usual hash structure, we're getting string representation of a hash structure.

Issue was discovered in this PR #19

Steps

• Uncomment testing against "rails_head"
• Run appraisal install
• Run appraisal rake

Result

Following errors are returned for tests that run against rails head.

Error:
PbbuilderTemplateTest#test_nested_message_partial:
NoMethodError: undefined method `best_friend' for "<API::Person: name: \"Chris Harris\", friends: [], best_friend: <API::Person: name: \"Max Verstappen\", friends: [], nicknames: [], favourite_foods: {}>, nicknames: [], favourite_foods: {}>":String

    assert_equal "Max Verstappen", result.best_friend.name
                                         ^^^^^^^^^^^^
    /Users/skatkov/Code/pbbuilder/test/pbbuilder_template_test.rb:77:in `block in <class:PbbuilderTemplateTest>'

Error:
PbbuilderTemplateTest#test_basic_template:
NoMethodError: undefined method `name' for "<API::Person: name: \"hello\", friends: [], nicknames: [], favourite_foods: {}>":String

    assert_equal "hello", result.name
                                ^^^^^
    /Users/skatkov/Code/pbbuilder/test/pbbuilder_template_test.rb:26:in `block in <class:PbbuilderTemplateTest>'

Expected result

Instead of a hash structure returned as it was before, now string representation of hash is being returned.

[julik]

It looks like we are not alone - the ActionView API has changed and it converts rendered data into strings

rails/rails#50930

In a way this would be an interesting excercise (a proto message is a string of bytes after all) but at what cost?

[julik]

And this got fixed upstream in rails/rails#51023 @skatkov can you check whether it works again?