ruby-on-rails – 无法在Ruby on Rails中保存多张图片Json

控制器/ renters_controller.rb

def create
 @renter = Renter.new(renter_params)

 if @renter.save
   gflash notice: "Le loueur a bien été enregistré"
   redirect_to '/'
 else
   gflash :now,notice: "Une erreur est survenue."
   render :new
 end
end

def renter_params
  params.require(:renter).permit(:name,:address,:website,:email,:phone,:review,:latitude,:longitude,:user_id,pictures: [])
end

车型/ renter.rb

class Renter < ActiveRecord::Base
  belongs_to :user
  geocoded_by :address
  after_validation :geocode
  reverse_geocoded_by :latitude,:longitude
  after_validation :reverse_geocode  # auto-fetch address
  mount_uploader :image,ImageUploader
  mount_uploader :pictures; PicturesUploader
end

我有一个上传者文件
上传/ pictures_uploader.rb

在我的观点表上
视图/房客/ _form.html.haml

= form_for(@renter,:hmtl => {:multipart => true}) do |f|
  - if @renter.errors.any?
    #error_explanation
      %h2
        = pluralize(@renter.errors.count,"error")
        prohibited this renter from being saved:
      %ul
        - @renter.errors.full_messages.each do |message|
          %li= message

  .row
    .large-6.medium-6.columns
      = f.text_field :name,placeholder: t('.name')
    .large-6.medium-6.columns
      = f.text_field :website,placeholder: t('.website')
  .row
    .large-6.medium-6.columns
      = f.text_field :email,placeholder: t('.email')
    .large-6.medium-6.columns
      = f.text_field :phone,placeholder: t('.phone')
  .row
    .large-6.medium-6.columns
      = f.text_field :address,placeholder: t('.address')
    .large-3.medium-3.columns
      = f.text_field :latitude,placeholder: :latitude
    .large-3.medium-3.columns
      = f.text_field :longitude,placeholder: :longitude
  .row
    = f.file_field :pictures,multiple: true,accept: "image/jpeg,image/jpg,image/gif,image/png"


  .row
    .large-12.columns.large-centered
      .large-12.columns.large-centered
      = f.submit :value => 'Valider',:class => 'default button'

和我的错误信息

Processing by RentersController#create as HTML
Parameters: {"utf8"=>"?","authenticity_token"=>"3YfZtWpnDb03yRs1HVp11jJSE15mm6PLOyIKxeJTcoOWsBaFNR/LYYYkD921Zzy5Urb9wgV5tpyhwG8oVAvZPw==","renter"=>{"name"=>"Miami boat rental","website"=>"","email"=>"","phone"=>"","address"=>"","latitude"=>"","longitude"=>"","pictures"=>[#<ActionDispatch::Http::UploadedFile:0x007f8ab9728530 @tempfile=#<Tempfile:/var/folders/1d/5fhghxdx5hz_7clwv4gkbwm80000gn/T/RackMultipart20160225-2432-sy0x2h.png>,@original_filename="corse_catamarans.png",@content_type="image/png",@headers="Content-Disposition: form-data; name="renter[pictures][]"; filename="corse_catamarans.png"rnContent-Type: image/pngrn">]},"commit"=>"Valider"}
Completed 500 Internal Server Error in 9ms (ActiveRecord: 0.0ms)

TypeError (no implicit conversion of nil into String):
app/controllers/renters_controller.rb:43:in `create'

我认为问题是由于图片的json,但这只是我的感觉.提前致谢.