Question

我在以下表单中包含此字段：<%= form.file_field :image, multiple: true, name: 'attachment[image][]', id: "uploads" %>

<%= form_for @attachment, url: create_attachment_path(@attachment), :html => {:id => "form", :multipart => true }, method: :post do |form| %>
      <% if @attachment.errors.any? %>
        <div class="centerList">
          <div id="error_explanation">
            <h2><%= pluralize(item.errors.count, "error") %> <%= t 'store_item_edit_4' %></h2>
            <% @attachment.errors.full_messages.each do |message| %>
              <li><%= message %></li>
            <% end %>
          </div>
        </div>
      <% end %>
      <div class="form-group">
        <div class="text-center">
          <label class="btn btn-primary"><%= t 'store_item_edit_5' %><span style="display:none;">
            <%= hidden_field_tag :item_id, params[:item_id], value: @item.id  %>

         <%= form.file_field :image, multiple: true, name: 'attachment[image][]', id: "uploads" %></span></label>
          <%= form.submit '', :style => "display: none;" %>
    <% end %>

我尝试使用此操作向数据库添加多个图像：

 def create
    @attachment = Attachment.new(attachment_params)

    respond_to do |format|
      if @attachment.save
        format.html { redirect_back fallback_location: root_path, notice: 'Image was successfully uploaded.' }
      else
        format.html { render :new }
        format.json { render json: @attachment.errors, status: :unprocessable_entity }
      end
    end
  end

这些是控制器内部的参数：

def attachment_params
    params.require(:attachment).permit(:item_id, :account_id, :image)
end

但是我得到了`未经许可的参数:: image＆＃39;在控制台内部，db行被创建但是具有空值。

Started POST "/attachments/create" for 127.0.0.1 at 2018-03-15 11:50:26 +0200
Processing by AttachmentsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"s0S6EwMgF9ac6djr028OfPBCXdKTM/NTjZFHdxi4Ot9MlUQZjHa5+0PNIu0Fg54b36SdWVzUE0g7fb3BJtF2gA==", "item_id"=>"2", "attachment"=>{"image"=>[#<ActionDispatch::Http::UploadedFile:0x007f82cf881090 @tempfile=#<Tempfile:/var/folders/hq/pr4rt14n7s31v3f6292wtjm00000gn/T/RackMultipart20180315-1190-mrrhdh.jpg>, @original_filename="image5.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"attachment[image][]\"; filename=\"image5.jpg\"\r\nContent-Type: image/jpeg\r\n">, #<ActionDispatch::Http::UploadedFile:0x007f82cf880f78 @tempfile=#<Tempfile:/var/folders/hq/pr4rt14n7s31v3f6292wtjm00000gn/T/RackMultipart20180315-1190-18zuptn.jpg>, @original_filename="image6.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"attachment[image][]\"; filename=\"image6.jpg\"\r\nContent-Type: image/jpeg\r\n">, #<ActionDispatch::Http::UploadedFile:0x007f82cf880ed8 @tempfile=#<Tempfile:/var/folders/hq/pr4rt14n7s31v3f6292wtjm00000gn/T/RackMultipart20180315-1190-1iuevmq.jpg>, @original_filename="image7.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"attachment[image][]\"; filename=\"image7.jpg\"\r\nContent-Type: image/jpeg\r\n">, #<ActionDispatch::Http::UploadedFile:0x007f82cf880e88 @tempfile=#<Tempfile:/var/folders/hq/pr4rt14n7s31v3f6292wtjm00000gn/T/RackMultipart20180315-1190-ynpy5a.jpg>, @original_filename="image8.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"attachment[image][]\"; filename=\"image8.jpg\"\r\nContent-Type: image/jpeg\r\n">]}}
  Store Load (1.0ms)  SELECT  "stores".* FROM "stores" WHERE "stores"."id" = $1 ORDER BY "stores"."id" ASC LIMIT $2  [["id", 1], ["LIMIT", 1]]
Unpermitted parameter: :image
   (0.2ms)  BEGIN
  SQL (0.7ms)  INSERT INTO "attachments" ("created_at", "updated_at") VALUES ($1, $2) RETURNING "id"  [["created_at", "2018-03-15 09:50:26.308178"], ["updated_at", "2018-03-15 09:50:26.308178"]]
   (0.7ms)  COMMIT

Answer 1

西蒙的评论是正确的。您需要允许一组标量类型。在你的场景中一个ActionDispatch :: Http :: UploadedFile对象，它被接受为标量。

http://guides.rubyonrails.org/action_controller_overview.html#strong-parameters

IMO如果属性相同，则无需在field_form上设置名称：name: 'attachment[image][]'，当您使用multiple: true时，name属性应该设置为完全相同。

还要告知您正在使用哪个rails版本。

Rails形成字段数组名称和参数

1 个答案: