Question

我需要访问attachments值，我找不到方法它说允许为假，尽管它在强参数中被允许...

 <ActionController::Parameters {
        "utf8"=>"✓", 
        "authenticity_token"=>"wMY3FheLXzezCBO8phfst85DGdSBmVRl+nljAUYviYxZsWXMXC+Rcddit3XaNNikaGTvdLH+rx5ZNh6bY31Yzw==", 
        "finished_guitar"=><ActionController::Parameters 
            { "title"=>"my super title",
             "description"=>"and my awsome description"
             } permitted: false>,
        "commit"=>"Create Finished guitar",
        "params"=>{
            "attachments"=>[{"image"=>#<ActionDispatch::Http::UploadedFile:0x007fcfa084fa90 @tempfile=#<Tempfile:/var/folders/11/mdddnw8d0zd961bsfkq1cjy00000gn/T/RackMultipart20180902-64552-9bms50.jpg>,
            @original_filename="image_1.jpg",
            @content_type="image/jpeg", 
            @headers="Content-Disposition: form-data; name=\"params[attachments][][image]\"; 
            filename=\"image_1.jpg\"\r\nContent-Type: image/jpeg\r\n">
        }]
         },"controller"=>"finished_guitars", "action"=>"create"} permitted: false>

我的控制器：

class FinishedGuitarsController < ApplicationController

  def index
      @finished_guitars = FinishedGuitar.all
  end

  def show
      @finished_guitar = FinishedGuitar.find(params[:id])
  end

  def new
    @finished_guitar = FinishedGuitar.new
    @attachments = @finished_guitar.attachments.build
  end

  def create
    @finished_guitar = FinishedGuitar.new(finished_guitar_params)
        if @finished_guitar.save
          unless params[:attachments].nil?
            params[:attachments]['image'].each do |a|
                @finished_guitar = @finished_guitar.attachments.create!(:image => a, :finished_guitar_id => @finished_guitar.id)
            end
          end
          render json: { finishedGuitardId: @finished_guitar.id, attachments: @finished_guitar.attachments_attributes }, status: 200
        else
            render json: { error: @finished_guitar.errors.full_messages.join(", ") }, status: 400 
        end
  end

  private
    def finished_guitar_params
        params.require(:finished_guitar).permit(:title, :description, attachments_attributes: [:id, :image, :finished_guitar_id])
    end
end

更新

我只是添加_form.html.erb

<div class="content">
    <%= simple_form_for @finished_guitar, html: {multipart: true, id: "my-dropzone", class: "dropzone" } do |f| %>
        <%= f.input :title %>
        <%= f.input :description %>

        <div class="dz-message needsclick">
            <h3>Drop file here</h3> or
            <strong>click</strong> to upload
        </div>
        <div class="fallback">      
            <br><br>
        <%= f.simple_fields_for :attachments do |ff| %>
            <%= ff.input_field :image, as: :file, multiple: true, name: "finished_guitar[attachments_attributes][][image]" %>
        <% end %>
        </div>
                    <br><br>

        <%= f.button :submit, class: "btn btn-primary" %>
    <% end %>     
</div>

如果我从"my-dropzone", class: "dropzone"删除<%= simple_form_for @finished_guitar, html: {multipart: true, id: "my-dropzone", class: "dropzone" } do |f| %>，我就可以上传文件

Answer 1

上面写着name=params[attachments][][image]，表明您有类似以下内容：

params[:params][:attachments]

我建议您使用rails-pry或byebug，在操作内停止执行，然后可以轻松检查params哈希并执行类似params.keys或params[:params]的操作，以查看实际的内容

访问ActionController参数的值

更新

1 个答案: