[Rails] Add ability to delete media for Speaker when uploaded

[rudokemper]

Context:

In Terrastories, it is possible to add media assets (such as photos, videos, and audio) to various data models. For Speaker, it is possible to add a photo. However, while it is currently possible to replace the photo, it is not possible to remove it altogether. We should have a Remove button for Speaker photos much like we have one for media assets in Places or Stories.

Acceptance criteria:

• [ ] When an admin user adds an image to a Speaker, and the user goes to the edit view, the user sees a Remove button underneath the media upload.
• [ ] When the user clicks the Remove button, the media asset is removed from the edit view.
• [ ] When the user saves the data, the media asset no longer shows up on the front end view of that data (i.e. /home) or in any Administrate views.
• [ ] The media asset is also removed from ActiveStorage.
• [ ] Existing tests do not break

[weizheheng]

Hi, I am Marcus from Malaysia. Just found out Hacktoberfest and would love to contribute to this issue. Is this issue still available for grab? Thanks and have a great day!

[mirandawang]

Hi @marcushwz , apologies for the delay in response. You are definitely welcome to work on this! Let us know if you have any questions. Thanks! :D

[claracavalcante]

Hello! If this issue still needs work, I would like to work on it :)

[rudokemper]

Sure, @claracavalcante! I will assign you :)

[julinvictus]

@claracavalcante @rudokemper, ok if I give it a try?

[claracavalcante]

@julinvictus absolutely! I ended up not being able to tackle it yet.

[rudokemper]

Thanks @claracavalcante! And assigning you, @julinvictus :)