Should have a helper to create update_elements hash

[kakra]

I'm using the following application helper that's handy when creating the :update_elements option:

def autofill form, *fields
  fields.inject({}) {|hash,field| hash.merge! field => "##{form.object_name}_#{field.to_s}" }
end

Use like this:

f.autocomplete_field :brand_name, autocomplete_brand_name_products_path,
  update_elements: autofill(f, :slogan, :extra1, :extra2)

This can be used as a companion method to the model method for generating custom json when using semantic forms.

Maybe this could be incorporated into this gem.