当我尝试提交表单时,发生以下错误:Validation failed: Images imageable must exist
并呈现相同的new.html.erb
视图。
如果我在file field
中评论new.html.erb
。产品创建成功。
产品控制器:
def new
@product = Product.new
end
def create
@product = Product.create!(product_params)
if @product.save
redirect_to products_path, notice: "Product Created Successfully"
else
render "new"
end
end
def product_params
params.require(:product).permit(:name, :quantity, :price, images_attributes: [:id, :photo, :_destroy])
end
new.html.erb:
<%= nested_form_for @product, html: { multipart: true } do |f|%>
<h2>New</h2>
<P> <%= f.label :name %> <%= f.text_field :name %> </P>
<P> <%= f.label :quantity %> <%= f.text_field :quantity %> </P>
<P> <%= f.label :price %> <%= f.text_field :price %> </P>
<%= f.fields_for :images do |p| %>
<p> <%= p.label :photo %> <%= p.file_field :photo %> </p>
<%= p.link_to_remove "Remove Image" %>
<% end %>
<%= f.link_to_add "Add Image", :images %>
<%= f.submit "Add Product" %>
<% end %>
20160725102038_add_image_columns_to_imageable.rb:
class AddImageColumnsToImageable < ActiveRecord::Migration[5.0]
def up
add_attachment :images, :photo
end
def down
remove_attachment :images, :photo
end
end
型号:product.rb
class Product < ApplicationRecord
has_one :variant
has_many :images, as: :imageable, dependent: :destroy
accepts_nested_attributes_for :images, allow_destroy: true
end
型号:image.rb
class Image < ApplicationRecord
belongs_to :imageable, polymorphic: true
has_attached_file :photo, styles: { medium: "300x300>", thumb: "100x100>" }, default_url: "/images/:style/missing.png"
validates_attachment :photo, content_type: { content_type: ["image/jpg", "image/jpeg", "image/png", "image/gif"] }
end
最佳答案
在导轨5中,belongs_to
确保关联的模型必须存在。
例如,在此多态关联中,图像模型具有belongs_to :imageable
,而产品模型具有has_many :images
。
因此,在new.html.erb
中,我们正在创建图像,但是相应的产品不存在,所以这就是错误Image imageable must exist
的原因。
解
在图像模型中建立optional: true
关联时添加belong_to
。
图像模型现在看起来像:
class Image < ApplicationRecord
belongs_to :imageable, polymorphic: true, optional: true
has_attached_file :photo, styles: { medium: "300x300>", thumb: "100x100>" }, default_url: "/images/:style/missing.png"
validates_attachment :photo, content_type: { content_type: ["image/jpg", "image/jpeg", "image/png", "image/gif"] }
end
关于paperclip - 错误:验证失败:必须存在可成像的图像,rails-5.0,paperclip-5,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/38584189/