Problem with file_column storing images and other files

I have a model called ProductFiles which associates an arbitrary
amount of image and documents with a product. I am using the
file_column plugin to manage the upload and storage of the images,
like so:

class ProductFile < ActiveRecord::Base

Accepted MIME types, mime types that are not part of this list are

rejected
MIME_EXTENSIONS = {
“image/gif” => “gif”,
“image/jpg” => “jpg”,
“image/png” => “png”,
“application/pdf” => “pdf”,
“application/msword” => “doc”,
“application/zip” => “zip”,
“text/plain” => “txt”,
“text/xml” => “xml”,
“video/mpeg” => “mpeg”,
“video/quicktime” => “mov”,
}

belongs_to :product
validates_presence_of :file_name, :product_id
file_column( :file_name,
:options => {:mime_extensions => MIME_EXTENSIONS},
:magick => {:versions => {:small => {:crop => ‘1:1’,
:size => “75x75”},
:medium => {:size =>
“150x150”} } } )

end

My problem is that when I include the :magick options hash to deal
with images, file_column doesn’t accept other types of files anymore:
only images. I figured a way around this is to do something like:

class ProductFile < ActiveRecord::Base

Accepted MIME types, mime types that are not part of this list are

rejected
IMAGE_EXTENSIONS = {
“image/gif” => “gif”,
“image/jpg” => “jpg”,
“image/png” => “png”
}
OTHER_EXTENSIONS = {
“application/pdf” => “pdf”,
“application/msword” => “doc”,
“application/zip” => “zip”,
“text/plain” => “txt”,
“text/xml” => “xml”,
“video/mpeg” => “mpeg”,
“video/quicktime” => “mov”,
}

belongs_to :product
validates_presence_of :file_name, :product_id

file_column( :image_name,
:options => {:mime_extensions => IMAGE_EXTENSIONS},
:magick => {:versions => {:small => {:crop => ‘1:1’,
:size => “75x75”},
:medium => {:size =>
“150x150”} } } )

file_column( :file_name,
:options => {:mime_extensions => OTHER_EXTENSIONS})

end

This seems a bit messy, as either one or the other column will be
filled out at any given time. Is there a better solution?