Multiscreen field for loading files with nested attributes in Rails

Question

I currently have a Note model that accepts nested attributes for the Attachments model that uses Carrierwave. When adding a note, I have a nested form that allows you to attach the file to a new Note:

Nested form field:

<%= f.file_field :image, multiple: true, name: "attachment[file]" %> 

I use Cocoon Stone to add a nested field. Although I can easily let them add several fields for uploading files using Cocoon and add several attachments there, I want to upload only one field for uploading files and let them use multi select to select multiple images.

When I do this, the file upload box says “2 images” next to it. However, when submitting the form, only one file is listed in the attachments_attributes section. I need all attachments to be sent immediately, since the Note has not yet been saved.

What is the right way to do this? I know Railscast on this topic, but it does not seem to apply to my specific scenario.

Any help is appreciated.

Answer 1

Just add [] to your options

 <%= f.file_field :image, multiple: true, name: "attachment[file][]" %>