I find that writing features can get really repetitive. So to get rid of writing steps over and over again for multiple models I decided to create a pretty simple solution. It's not big enough to yield a gem so it's here for your use / modification. Comments or questions are welcome, would love to add to this as well.
step 'I modify the :model :attribute with/to :value' do |model_name, attribute, value|
id = "#{model_name}_#{attribute}"
fill_in "#{id}", with: value