Question

我可以通过嵌套属性上传文件，但我收到此错误：

expected Hash (got Array) for param 'project_images_attributes/

我不认为它来自上传部分，但它来自此代码：

<% @project.project_images.each do |pic| %> 
  <%= f.simple_fields_for :project_images, pic do |image_fields| %>
    <%= image_fields.label :_destroy, :class => "checkbox" do %>

    <div class="img-controller-exist-preview">
      <div class="img-controller-exist-img">
        <%= image_tag pic.photo.url(:thumb) %>
      </div>
      <div class="img-controller-exist-delete">
        <%= image_fields.check_box :_destroy %> <span>Delete</span>
      </div>
    </div>
    <% end %>

  <% end %>
<% end %>

因为，当我删除它时，我可以上传新照片。

这允许用户在编辑时删除现有图像。

这是我的完整形式：

<%= simple_form_for @project, html: { multipart: true } do |f| %>

<%= f.simple_fields_for :project_images, ProjectImage.new, child_index: ProjectImage.new.object_id do |ff| %>
  <%= ff.label :photo, "Upload Photo" %>
  <%= ff.file_field :photo, multiple: true, name: "project[project_images_attributes][][photo]" %>
<% end %>

<% @project.project_images.each do |pic| %> 
  <%= f.simple_fields_for :project_images, pic do |image_fields| %>
    <%= image_fields.label :_destroy, :class => "checkbox" do %>

    <div class="img-controller-exist-preview">
      <div class="img-controller-exist-img">
        <%= image_tag pic.photo.url(:thumb) %>
      </div>
      <div class="img-controller-exist-delete">
        <%= image_fields.check_box :_destroy %> <span>Delete</span>
      </div>
    </div>
    <% end %>

  <% end %>
<% end %>

<%= f.submit %>
<% end %>

我测试了编辑项目并上传了要添加的图片，我收到错误。但如果我不上传任何内容，编辑工作。我可以删除照片和内容，但只有在我尝试上传内容时才会出现此错误。

ProjectImage模型：

class ProjectImage < ActiveRecord::Base
  belongs_to :project

  paperclip_opts = {
    :styles => { :large => "800x800>", :medium => "x430>", :frontpage_thumb => "130x95#", :thumb => "150x150#" }, 
    :convert_options => { :all => "-quality 75 -strip" }
  }

  has_attached_file :photo, paperclip_opts
  validates_attachment_content_type :photo, content_type: /\Aimage\/.*\Z/

end

项目模型：

class Project < ActiveRecord::Base
  has_many :project_images, dependent: :destroy

  accepts_nested_attributes_for :project_images, allow_destroy: true
end

控制器：

def edit
  @project = current_user.projects.find(params[:id])

end
def update
  @project = current_user.projects.find(params[:id])

  respond_to do |format|
    if @project.update(project_params)

      if params[:photos]
        params[:photos].each { |image|
          @project.project_images.create(photo: image)
        }
      end     

      format.html { redirect_to @project, notice: 'Project was successfully updated.' }
      format.json { render :show, status: :ok, location: @project }
    else
      format.html { render :edit }
      format.json { render json: @project.errors, status: :unprocessable_entity }
    end
  end
end

Answer 1

问题出在这一行

<%= f.simple_fields_for :project_images, pic do |image_fields| %>

fields_for（或simple_fields_for正在使用simple_form_for）期望hash作为第三个参数（选项），但您传递的是array。

在编辑时上传，但是为param接收预期的Hash（获取数组）

1 个答案: