[英]Ruby on Rails - Image Upload
我想将图像添加到模型中。 我有一些用Devise设置的用户,他们有他们要出售的have_many
物品。
我现在想将图像数组添加到Item模型(不确定这是否是最好的方法)。
我看过回形针,但只能做一张图像。 还研究了载波,但不确定如何在现有模型上实现。
这是我的一些代码。
Item.rb
class Item < ActiveRecord::Base
belongs_to :user
validates :title, presence: true
validates :price, presence: true
validates :description, presence: true
end
items_controller.rb
class ItemsController < ApplicationController
before_action :findItem, only: [:edit, :update, :sold]
def index
@items = Item.all
end
def new
@item = Item.new
end
def create
@item = Item.create(item_params)
@item.user = current_user
if @item.save
flash[:success] = "Your item was successfully listed."
render 'show'
else
flash[:error] = "Your item could not be listed. Please try again."
render 'new'
end
end
def show
@item = Item.find(params[:id])
end
def edit
end
def update
if @item.update(item_params)
flash[:success] = "Your item listing was updated successfully."
redirect_to item_path(@item)
else
flash[:error] = "Your listing was not updated. Please try again."
render 'edit'
end
end
def sold
@item.toggle(:sold)
@item.save
redirect_to item_path(@item)
end
private
def item_params
params.require(:item).permit(:title, :price, :description)
end
def findItem
@item = Item.find(params[:id])
end
end
Item / new.html.erb的表格
<div class="row">
<div class="col-xs-12">
<%= form_for(@item, :html => {class: "form-horizontal", role: "form"}) do |f| %>
<div class="form-group">
<div class="control-label col-sm-2">
<%= f.label :title %>
</div>
<div class="col-sm-8">
<%= f.text_field :title, class: "form-control", placeholder: "What are you selling?", autofocus: true %>
</div>
</div>
<div class="form-group">
<div class="control-label col-sm-2">
<%= f.label :price %>
</div>
<div class="col-sm-8">
<%= f.number_field :price, class: "form-control" %>
</div>
</div>
<div class="form-group">
<div class="control-label col-sm-2">
<%= f.label :description %>
</div>
<div class="col-sm-8">
<%= f.text_area :description, rows: 10, class: "form-control", placeholder: "Describe your item. The more detail you include, the more likely it is to sell." %>
</div>
</div>
<div class="form-group">
<div class="center col-sm-offset-1 col-sm-10">
<%= f.submit class: "btn btn-primary btn-lg" %>
</div>
</div>
<% end %>
<div class="center col-xs-4 col-xs-offset-4">
<%= link_to "[ Cancel and return to listing page ]", items_path %>
</div>
您只想创建一个图像模型。 并设置与Item的关系,如下所示: Item
has_many :images
,以及Image
belongs_to :item
。
但是,是的,回形针是一个好的开始。
编辑 :哦,欢迎Rails,您会发现一个好的社区随时可以提供帮助。 您可能还会发现搜索accepts_nested_attributes_for
非常有用,因此可以将图像上载到“项目”表单和cocoon
以动态添加和删除项目表单上的图像。
#app/models/item.rb
class Item < ActiveRecord::Base
has_many :images
accepts_nested_attributes_for :images
validates :title, :price, :description, presence: true
end
#app/models/image.rb
class Image < ActiveRecord::Base
belongs_to :item
has_attached_file :picture
end
-
上面的代码允许您创建一个Item
,其中将包含任意数量的images
。 您可以通过accepts_nested_attributes_for
传递新images
:
#app/controllers/items_controller.rb
class ItemsController < ApplicationController
def new
@item = Item.new
@item.images.build
end
def create
@item = Item.new item_params
@item.save
end
private
def item_params
params.require(:item).permit(images_attributes: [:picture])
end
end
#app/views/items/new.html.erb
<%= form_for @item do |f| %>
<%= f.fields_for :images do |i| %>
<%= i.file_field :picture %>
<% end %>
<%= f.submit %>
<% end %>
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