Ruby on Rails

Hey Ruby on Rails Community

i'm trying to Add Categories to my Rails app, but don't quite know how
to do this.

I have many Pins(Images) and want the user to be able to assign a
category on those Pins. ASSIGN not create, edit, or delete a Category,
just selecting one for their Pin. Meaning that, When a user uploads a
pin, he can choose from a dropdown list a Category.

Then, another user can choose from the Menu a Category, and ONLY the
Pins in this Category will be listed.

How do i do this? Where to start ?

Thank you

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