I think this would be a great feature to have. Looking around the code I
find that one main issue is that doing attribute assignment like
`@record.file=attachable`
uploads the attachable to the service right away. We could make it so that
`ActiveStorage::Attached` stores the attachable as an instance variable and
a new method called `attach!` actually uploads the file.
Then one could validate that `file.content_type` is valid.
On Monday, April 2, 2018 at 8:36:22 AM UTC-5, Matt Yanchek wrote:
>
> Hey all, with ActiveStorage coming out very soon I am very quickly finding
> a need for some validations for attachments before storing. Some very quick
> validation helpers would be great for example content type and size would
> be huge wins in protecting an application that is expecting to only allow
> images.
>
> Just a quick example:
>
> class User < ApplicationRecord
> has_one_attached :avatar
>
> validates :avatar, attachment: { content_types: 'image/*', size: 50 }
> end
>
>
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