ruby - Rails 5 Fog CarrierWave Photo Upload to Amazon S3 no implicit conversion of String into Array -

i absolute beginner of ruby on rails. there error encountered , not know deal with.

what i'd do: uploading photo amazon s3 bucket.

error: no implicit conversion of array string.

the error comes out when @prototype.save fails in prototype#create action in prototypes_controller.rb

question: in order solve issue, when should convert array string?

the params displayed in webrick server.

{"utf8"=>"✓",  "prototype"=>    {"name"=>"dafda",     "prototype_images_attributes"=>       {"0"=>         {"content"=>            #<actiondispatch::http::uploadedfile:0x007fe07491b778            @content_type="image/jpeg",            @headers="content-disposition: form-data; name=\"prototype[prototype_images_attributes][0][content]\"; filename=\"card100002057_1.jpg\"\r\ncontent-type: image/jpeg\r\n",            @original_filename="card100002057_1.jpg",            @tempfile=#<file:/var/folders/yy/42bpgmdj4t16rf0_5xsly3tc0000gp/t/rackmultipart20170815-70968-fzdoey.jpg>>,         "status"=>"main"},        "1"=>{"status"=>"sub"},        "2"=>{"status"=>"sub"}},     "catchcopy"=>"fdafda",     "concept"=>"fdafda"},   "commit"=>"publish"} 

here files might have error.

prototype_controller.rb

def create   @prototype = current_user.prototypes.new(prototype_params)    if @prototype.save     flash[:notice] = 'prototype created.'     redirect_to root_path   else     flash[:alert] = 'prototype not created.'     render :new   end end  private def prototype_params   params.require(:prototype)     .permit(:name,             :catchcopy,             :concept,             prototype_images_attributes: [:content, :status]     ) end  def set_prototype   @prototype = prototype.find(params[:id]).decorate end 

prototype_image_uploader.rb

class prototypeimageuploader < carrierwave::uploader::base   storage :fog    def store_dir     'uploads'   end    def extension_whitelist     %w(jpg jpeg gif png)   end end 

config/initializer/carrierwave.rb

require 'carrierwave/storage/abstract' require 'carrierwave/storage/file' require 'carrierwave/storage/fog'  carrierwave.configure |config|   config.storage = :fog   config.fog_credentials = {     provider: 'aws',     aws_access_key_id: env['aws_access_key_id'],     aws_secret_access_key: env['aws_secret_access_key'],     region: 'ap-northeast-1'   }    case rails.env     when 'production'       config.fog_directory = env['s3_bucket'],       config.asset_host = env['s3_bucket_host']     when 'development'       config.fog_directory = env['s3_bucket'],       config.asset_host = env['s3_bucket_host']     when 'test'       config.storage = :file   end end 

backtrace

{"utf8"=>"✓",  "prototype"=>    {"name"=>"dafda",     "prototype_images_attributes"=>       {"0"=>         {"content"=>            #<actiondispatch::http::uploadedfile:0x007fe07491b778            @content_type="image/jpeg",            @headers="content-disposition: form-data; name=\"prototype[prototype_images_attributes][0][content]\"; filename=\"card100002057_1.jpg\"\r\ncontent-type: image/jpeg\r\n",            @original_filename="card100002057_1.jpg",            @tempfile=#<file:/var/folders/yy/42bpgmdj4t16rf0_5xsly3tc0000gp/t/rackmultipart20170815-70968-fzdoey.jpg>>,         "status"=>"main"},        "1"=>{"status"=>"sub"},        "2"=>{"status"=>"sub"}},     "catchcopy"=>"fdafda",     "concept"=>"fdafda"},   "commit"=>"publish"} user load (0.4ms)  select  `users`.* `users` `users`.`id` = 2 order `users`.`id` asc limit 1      begin    sql (0.3ms)  insert `prototypes` (`name`, `catchcopy`,  `concept`, `created_at`, `updated_at`, `user_id`) values ('fdfad',   'fdfad', 'fdfd', '2017-08-15 13:05:29', '2017-08-15 13:05:29', 2)   sql (0.2ms)  insert `prototype_images` (`content`,   `prototype_id`, `created_at`, `updated_at`, `status`) values   ('13248473_1049158575176323_1670750882476661352_o.jpg', 56, '2017-08-  15 13:05:29', '2017-08-15 13:05:29', 0)  (0.6ms)  rollback  completed 500 internal server error in 32ms (activerecord: 2.0ms)   typeerror (no implicit conversion of array string):   app/controllers/prototypes_controller.rb:24:in `create' 

if has encountered error below, can give me clues? advice appreciated! in advance!

i suggest add following lines inside carrierwave.configure block:

  config.ignore_integrity_errors = false   config.ignore_processing_errors = false   config.ignore_download_errors = false 

it more understandable error.