Question

I want to do some processing on an uploaded image using RMagick before PaperClip which is specified in the model taken over.

Is there any way to accomplish this?

Answer 1

You can access the file data in the controller params before passing it into your object. You probably have something like this in your controller:

def create
  @model = MyModel.new(params[:model])
  if @model.save
  # ...
end

What you could do instead is:

def create
  file = params[:model][:file]
  # do something with it...
  @model = MyModel.new(params[:model])
  @model.file = file
  if @model.save
  # ...
end

I’m not sure how ActiveAdmin controllers work but you can probably inherit from them and modify only the actions you want to change.