Fix symbols in create bar

[mdahlhausen]

The hash fields need to be cast as symbols, not strings

Pull request overview

Pull Request Author

• Method changes or additions
• Added tests for added methods

Review Checklist

This will not be exhaustively relevant to every PR.

• Perform a code review on GitHub
• All related changes have been implemented: method additions, changes, tests
• Check rubocop errors
• Check yard doc errors
• If fixing a defect, verify by running develop branch and reproducing defect, then running PR and reproducing fix
• If a new feature, test the new feature and try creative ways to break it
• CI status: all green or justified