我是 Rails 4 的新手,我想添加多个图像.我的应用中有一个产品模型和图片模型.产品有很多图片,图片有一个图像及其回形针附件但我无法访问我认为的图像models/products.rb
class Product :破坏结尾models/picture.rb
类图片真的has_attached_file :image,:styles =>{:thumb =>['100x100#', :jpg, :quality =>70],:预览 =>['480x480#', :jpg, :quality =>70],:大 =>['600>', :jpg, :quality =>70],:视网膜 =>['1200>', :jpg, :quality =>30]},:路径=>":rails_root/public/images/:id/:filename",:url =>"/images/:id/:filename"do_not_validate_attachment_file_type :image结尾查看页面
<% @products.each 做 |product|%><div class="col-sm-3 col-lg-3 col-md-3"><div class="缩略图"><%= product.image.url(:thumb) %><div class="caption"><h4 class="pull-right">Rs.<%= product.price %><h4><%= link_to 'Show', product %><p><strong>名称:</strong> <%= product.name %></span></p><% 如果 !product.description.blank?%><p><strong>说明:</strong><%=产品.描述%</p><%结束%><% 如果 !product.reason.blank?%><p><strong>原因:</strong><%= product.reason %></p><%结束%><%结束%>
解决方案您正试图在父模型上调用嵌套方法.
你有:
#app/models/product.rb类产品这意味着您必须调用:
<% @products.each do |product|%><% product.pictures.each do |picture|%><%=图片.image.url %><%结束%><%结束%>--
您收到 noMethod 错误,因为您试图在您的 Product 对象(不存在)上调用 image:
不存在 %>修复
修复比您意识到的要复杂一些.
具体来说,您必须确保能够添加/创建嵌套的 Picture 对象,该对象来自 accepts_nested_attributes_for 方法:
#app/models/product.rb类产品这将允许您创建适当的表单 &控制器操作:
#app/controllers/products_controller.rb类 ProductsController <应用控制器定义新@product = Product.new@product.pictures.build结尾定义创建@product = Product.new product_params@product.save结尾私人的def product_paramsparams.require(:product).permit(...,pictures_attributes: [:image])结尾结尾然后您将使用 fields_for:
#app/views/products/new.html.erb<%= form_for @product do |f|%><%= f.fields_for :图片做 |p|%><%= p.file_field :image %><%结束%><%= f.submit %><%结束%>这将允许您使用新产品保存新的图片/图像,然后使用上面的代码,您将能够显示它们!!
奖金
我一直分享的一个专业提示是paperclip_defaults::>
#config/application.rb...config.paperclip_defaults = {:styles =>{:thumb =>['100x100#', :jpg, :quality =>70],:预览 =>['480x480#', :jpg, :quality =>70],:大 =>['600>', :jpg, :quality =>70],:视网膜 =>['1200>', :jpg, :quality =>30] #->这是正确的格式吗?},:路径=>":rails_root/public/images/:id/:filename",:url =>"/images/:id/:filename"}不是在 Picture 模型中包含所有样式,您可以在 config/application.rb 中将它们设置为默认值" - 这将允许您只调用 has_attached_file :image,根据需要更改样式:
#app/models/picture.rb班级图片将使用可以根据需要覆盖的默认值结尾Iam new to rails 4 i want add multiple images.i have a product model and picture model in my app.product has many picture and picture has a image and its a paperclip attachment but i cant access images in my view models/products.rb
class Product < ActiveRecord::Base belongs_to :user belongs_to :category has_many :comments , dependent: :destroy has_many :pictures, :dependent => :destroy endmodels/picture.rb
class Picture < ActiveRecord::Base belongs_to :product accepts_nested_attributes_for :images,:allow_destroy => true has_attached_file :image,:styles => { :thumb => ['100x100#', :jpg, :quality => 70], :preview => ['480x480#', :jpg, :quality => 70], :large => ['600>', :jpg, :quality => 70], :retina => ['1200>', :jpg, :quality => 30] }, :path => ":rails_root/public/images/:id/:filename", :url => "/images/:id/:filename" do_not_validate_attachment_file_type :image endView page
<div class="row"> <% @products.each do |product| %> <div class="col-sm-3 col-lg-3 col-md-3"> <div class="thumbnail"> <%= product.image.url(:thumb) %> <div class="caption"> <h4 class="pull-right">Rs.<%= product.price %> </h4> <h4><%= link_to 'Show', product %> </h4> <p><strong>Name:</strong>  <%= product.name %></span></p> <% if !product.description.blank? %> <p><strong>Description:</strong> <%= product.description %></p> <% end %> <% if !product.reason.blank? %> <p><strong>Reason:</strong><%= product.reason %></p> <% end %> </div> </div> </div> <% end %> </div>解决方案
You're trying to call a nested method on your parent model.
You have:
#app/models/product.rb class Product < ActiveRecord::Base has_many :pictures end #app/models/picture.rb class Picture < ActiveRecord::Base belongs_to :product has_attached_file :image endThis means that you will have to call:
<% @products.each do |product| %> <% product.pictures.each do |picture| %> <%= picture.image.url %> <% end %> <% end %>--
You're receiving a noMethod error because you're trying to call image on your Product object (which doesn't exist):
<%= picture.image.url #-> doesn't exist %>
Fix
The fix is a little more involved than you realize.
Specifically, you have to ensure that you're able to add/create the nested Picture objects, which comes from the accepts_nested_attributes_for method:
#app/models/product.rb class Product < ActiveRecord::Base has_many :pictures accepts_nested_attributes_for :pictures endThis will allow you to create the appropriate form & controller actions:
#app/controllers/products_controller.rb class ProductsController < ApplicationController def new @product = Product.new @product.pictures.build end def create @product = Product.new product_params @product.save end private def product_params params.require(:product).permit(..., pictures_attributes: [:image]) end endYou'll then use fields_for:
#app/views/products/new.html.erb <%= form_for @product do |f| %> <%= f.fields_for :pictures do |p| %> <%= p.file_field :image %> <% end %> <%= f.submit %> <% end %>This will allow you to save new Picture's / images with a new product, then using the code above, you'll be able to show them!!
Bonus
A pro tip I keep sharing is paperclip_defaults:
#config/application.rb ... config.paperclip_defaults = { :styles => { :thumb => ['100x100#', :jpg, :quality => 70], :preview => ['480x480#', :jpg, :quality => 70], :large => ['600>', :jpg, :quality => 70], :retina => ['1200>', :jpg, :quality => 30] #-> is this correct formatting? }, :path => ":rails_root/public/images/:id/:filename", :url => "/images/:id/:filename" }Instead of including all the styles in your Picture model, you can set them as "defaults" in your config/application.rb - which will allow you to just call has_attached_file :image, changing the styles as you require:
#app/models/picture.rb class Picture < ActiveRecord::Base has_attached_file :image #-> will use the defaults which can be overridden as required end
更多推荐
多张图片上传错误
发布评论