参数包含要作为哈希值的数组

params

file_field, :multiple => true

{\"gallery\"=>{\"name\"=>\"A Gallery\", \"photos_attributes\"=>{\"0\"=>{\"image\"=>[#<1st Image data removed for brevity>, #<2nd Image data removed for brevity>]}}}, \"commit\"=>\"Save\"}

{\"gallery\"=>{\"name\"=>\"A Gallery\", \"photos_attributes\"=>{\"0\"=>{\"image\"=>#<1st Image data removed for brevity>}, \"1\"=>{\"image\"=>#<1st Image data removed for brevity>}}}, \"commit\"=>\"Save\"}

i = 0
params[:gallery][:photos_attributes][\"0\"][:image].reduce({}) do |result, element|
  result[i++.to_s] = element
end

i = 0
params[:gallery][:photos_attributes][\"0\"][:image].reduce({}) do |result, element|
  result[(i += 1).to_s] = element
  result
end

{ \"photos_attributes\" => { \"0\" => <image1>, \"1\" => <image2>, ... }

{ \"photos_attributes\" => [ <image1>, <image2>, ... ] }

params[\"gallery\"][\"photos_attributes\"] = params[\"gallery\"][\"photos_attributes\"][\"0\"][\"image\"]

i = 0
params[\"gallery\"][\"photos_attributes\"] = {}.tap do |hash|
  params[\"gallery\"][\"photos_attributes\"][\"0\"][\"image\"].each do |image|
    hash[i.to_s] = image
    i = i + 1
  end
end