Rails ActiveStorage direct uploads on localhost

Question

Using Rails 5.2 rc1, is it possible to do direct uploads on localhost in development?

This is my form new.html.erb:

<div class="form-group">
  <%= f.label :images %>
  <%= f.file_field :images, multiple: true, direct_upload: true, class: 'form-control' %>
</div>

and this is the error I get in console:

ActiveSupport::MessageVerifier::InvalidSignature (ActiveSupport::MessageVerifier::InvalidSignature):

Answer 1

For anyone else bumping into this in the future:

I was mistakenly using this in my controller:

def create
  @post = Post.new(post_params)
  @post.images.attach(post_params[:images]) # THIS WAS THE ERROR!!!

  respond_to do |format|
    if @post.save
      format.html { redirect_to @post, notice: 'Post was successfully created.' }
      format.json { render :show, status: :created, location: @post }
    else
      format.html { render :new }
      format.json { render json: @post.errors, status: :unprocessable_entity }
    end
  end
end

Creating a new post and attaching images which are already attached caused all sorts of errors like broken PG keys and invalid signatures.

Make sure you omit attach when you upload files on a newly created model instance.