Question

我有一个编辑表单，用户可以在其中添加图像。表格属于'画廊'模型，图像是儿童模型'展览图像'。我可以编辑标题，因为它属于父模型，但是我附加的图像将显示为nil（如果我在没有rails image_tag的情况下显示它们，我会得到类似于这个ExhibitionImage id：1，image_file_name：nil，image_content_type：nil， image_file_size：nil，image_updated_at：nil，gallery_id：8，created_at :)。我想象它是我对嵌套表单的实现，我不太明白。

这是相关代码：

画廊控制器

def update
    @gallery = Gallery.friendly.find params[:id]
    respond_to do |format|
      if @gallery.update(gallery_params)
        format.html { redirect_to @gallery, notice: 'Gallery was successfully updated.' }
        format.json { render :show, status: :ok, location: @gallery }
      else
        format.html { render :edit }
        format.json { render json: @gallery.errors, status: :unprocessable_entity }
      end
    end
  end

  def edit
    @gallery = Gallery.friendly.find params[:id]
    @image = @gallery.exhibition_images.new
  end

画廊模特

class Gallery < ActiveRecord::Base
  extend FriendlyId
    friendly_id :title, use: :slugged
    belongs_to :guide
  has_many :exhibition_images, :autosave => true
    accepts_nested_attributes_for :exhibition_images
end

展览图片

class ExhibitionImage < ActiveRecord::Base
   belongs_to :gallery, :autosave => true

    has_attached_file :image, styles: { small: "100x100", guide: "500x500" }
    validates_attachment_content_type :image, :content_type => ["image/jpg", "image/jpeg", "image/png", "image/gif"]

end

编辑表格

<%= bootstrap_form_for(@gallery, :html => {:multipart => true}, layout: :horizontal, label_col: "col-sm-2", control_col: "col-sm-10") do |f| %>
  <%= f.text_field :title %>    

<%= f.fields_for :exhibition_images do |f| %>
    <%= f.file_field :image, help: "Ensure images are minimum 400x400px"  %>

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

如何将附加的图像保存到数据库中？？

Answer 1

好的，我需要将此行添加到我的params方法

  params.require(:gallery).permit(:title, exhibition_images_attributes: [:image])

'exhibition_images_attributes'而不是模型属性。不知道为什么，但它确实有效。

嵌套属性表单，图像未保存RAILS

1 个答案: