[英]Two questions on paperclip with multiple uploads
我正在做一份工作。 用戶可以在其中創建海報的Rails 4應用程序。 海報可以上傳多個圖像。 實際上,我沒有明確的錯誤,只有兩個問題。 但是在提出問題之前,這是我的文件。 Poster.rb:
class Poster < ActiveRecord::Base
has_many :poster_images, dependent: :destroy
accepts_nested_attributes_for :poster_images, allow_destroy: true
belongs_to :type
belongs_to :user
default_scope -> { order('created_at DESC') }
validates :title, :body, :publish_date, :user_id, :presence => true
end
poster_image.rb:
class PosterImage < ActiveRecord::Base
belongs_to :poster
has_attached_file :image, :styles => {:medium => "300x300>", :thumb => "100x100>" }
end
posters_controller.rb:
class PostersController < ApplicationController
before_filter :set_poster, only: [:show, :edit, :update, :destroy]
before_filter :authenticate_user!, :except => [:index, :show]
authorize_resource
load_resource except: :create
# GET /posters
# GET /posters.json
def index
@posters = Poster.paginate(page: params[:page], :per_page => 10)
end
# GET /posters/1
# GET /posters/1.json
def show
end
# GET /posters/new
def new
end
# GET /posters/1/edit
def edit
end
# POST /posters
# POST /posters.json
def create
@poster = Poster.new(poster_params)
@poster.user_id = current_user.id
respond_to do |format|
if @poster.save
format.html { redirect_to @poster, notice: 'Poster was successfully created.' }
format.json { render action: 'show', status: :created, location: @poster }
else
format.html { render action: 'new' }
format.json { render json: @poster.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /posters/1
# PATCH/PUT /posters/1.json
def update
respond_to do |format|
if @poster.update(poster_params)
format.html { redirect_to @poster, notice: 'Poster was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: @poster.errors, status: :unprocessable_entity }
end
end
end
# DELETE /posters/1
# DELETE /posters/1.json
def destroy
@poster.destroy
respond_to do |format|
format.html { redirect_to posters_url }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_poster
@poster = Poster.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def poster_params
params.require(:poster).permit(:title, :body, :publish_date, :type_id, :type_name, poster_images_attributes: :image )
end
end
_form.html.erb:
<%= simple_nested_form_for @poster, :html => {:multipart => true } do |f| %>
<%= f.input :title, :autofocus => true %>
<%= f.input :body %>
<%= f.input :publish_date %>
<%= f.input :type_id, :collection => Type.all, required: true %>
<%= f.fields_for :poster_images do |images_f| %>
<%= images_f.file_field :image %>
<%= images_f.link_to_remove "X" %>
<% end %>
<%= f.link_to_add "Add image", :poster_images %>
<div class="form-actions">
<%= f.button :submit, :class => 'btn-primary' %>
<%= link_to t('.cancel', :default => t("helpers.links.cancel")),
posters_path, :class => 'btn' %>
</div>
<% end %>
show.html.erb:
<%- model_class = Poster -%>
<div class="page-header">
<h1><%=t '.title', :default => model_class.model_name.human.titleize %></h1>
</div>
<dl class="dl-horizontal">
<dd><h3><%= @poster.title %></h3></dd>
<dd><%= @poster.body %></dd>
<dt><strong><%= model_class.human_attribute_name(:publish_date) %>:</strong></dt>
<dd><%= @poster.publish_date %></dd>
<dt><strong>Author:</strong></dt>
<dd><%= link_to @poster.user.name, @poster.user %></dd>
<dt><strong>Type:</strong></dt>
<dd><%= @poster.type.name %></dd>
</dl>
<dt><strong>Image(s):</strong></dt>
<% @poster.poster_images.each do |p| %>
<%= content_tag "p_#{p.id}" do %>
<%= image_tag p.image.url(:medium) %>
<% end %>
<% end %>
<div class="form-actions">
<%= link_to t('.back', :default => t("helpers.links.back")),
posters_path, :class => 'btn' %>
<% if current_user && (current_user.has_role?(:admin) || current_user.id==@poster.user_id) %>
<% if can? :update, Poster %>
<%= link_to t('.edit', :default => t("helpers.links.edit")),
edit_poster_path(@poster), :class => 'btn' %>
<% end %>
<%= link_to t('.destroy', :default => t("helpers.links.destroy")),
poster_path(@poster),
:method => 'delete',
:data => { :confirm => t('.confirm', :default => t("helpers.links.confirm", :default => 'Are you sure?')) },
:class => 'btn btn-danger' %>
<% end %>
</div>
現在我有兩個問題:
當我創建海報時,一切都會變得很好。 但是,當我嘗試更新海報並按下“編輯”時,我的表單即將進入,並且我看到了創建海報時所擁有的所有字段。 但是,如果在創建海報時我添加了圖片,則當我看到“編輯”表單時,我已經打開了添加圖片的鏈接。 如果我使用它,也可以,但是,例如,當我只是編輯我的姓名並保存而沒有添加新圖片時,我的“ show.html.erb”將顯示我之前的圖片和一個“損壞”的圖像它。 如果我有兩個圖像,則在更新海報時,Rails會嘗試使我再添加兩個圖像,或者自己添加兩個損壞的圖像標志。 有什么想法嗎?(如果您了解上面的內容)
正在檢查我的應用程序的人說,我忘記在“ poster_params”控制器中的“ poster_images_attributes :: image”中添加一些鍵。 我在SOF中發現這里已經足夠了,但是他說創建海報已經足夠了,但是對於編輯和刪除操作來說已經足夠了。 有什么想法我還要在poster_params中寫些什么? 謝謝
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