* Add comments to photos
Extend the photo show page to support comments by logged in users.
- Make the Comment model polymorphic.
- Update the Photo and Post models to have comments.
- Update the comments controller to handle the polymorphic association.
- Update the photo show page to display comments and a comment form.
- Create a reusable comments partial.
* Add migration
* Fix tests
* Fix tests
* Slightly fix tests
* Fix variables
* Add field
* Refactor slightly
* Refactor slightly
* Refactor slightly
* Refactor
* Photos respond to this as well
* Refactor to polymorphic_url
* Rename
* Wrong relationship
* Refactor and fix tests
* Fix relationships
* Fix rendering
* Fix tests
* Fix model tests
* Fix test
* Fix test
* Fix test
* Fix test
* Fix controller spec
* Fix view tests
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Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
Co-authored-by: Daniel O'Connor <daniel.oconnor@gmail.com>
