![rubyonrails]( "rubyonrails")
本文介绍了尝试使用回形针上传图像时，Rails 出现错误的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我才刚开始学习 Rails 并不断遇到错误，我主要通过搜索来解决这些错误.我遵循了 http://guides.rubyonrails.org/getting_started.html 上的教程并完成了它现在正在尝试上传图像以获取博客文章.但现在我被困在听起来很简单的事情上，使用回形针上传图像.我收到如下错误:
未定义的方法`attachment' for #
这是我的文件:
articles_controller.rb
class ArticlesController
article.rb
类文章", thumb: "100x100>"}, default_url: "/images/:style/missing.png"验证 :attachment, :attachment_content_type =>{:content_type =>['图片/png', '图片/jpg']}attr_accessor :image_file_namehas_many :comments, 依赖: :destroy验证:标题，存在:真实，长度:{ 最小值:2}结尾
_form.html.erb
<%= form_for @article, html: { multipart: true } do |f|％＞<% if @article.errors.any?％＞<div id="error_explanation"><h2><%=pluralize(@article.errors.count, "error") %>禁止这篇文章被保存:<ul><% @article.errors.full_messages.each 做 |msg|％＞<li><%=味精%><%结束%>
<%结束%><p><%= f.label :title %><br><%= f.text_field :title %></p><p><%= f.label :text %><br><%= f.text_area :text %></p><p><%= f.label :image %><br><%= f.file_field :image %></p><p><%= f.submit %></p><%结束%>
解决方案
在您的 article.rb 模型中，只需将 :attachment 更改为 :image 喜欢:
验证 :image, :attachment_content_type =>{:content_type =>['图片/png', '图片/jpg']}
I only started learning rails and keep running into errors that I mostly fix by searching them up. I followed the tutorial on http://guides.rubyonrails.org/getting_started.html and finished it and am now trying to upload images to got with the blog articles. But now I'm stuck with what sounds like a really simple thing to solve, uploading images using paperclip.I get errors like :
undefined method `attachment' for #
Here are my files:
articles_controller.rb
class ArticlesController < ApplicationController
def index
@articles = Article.all
end
def show
@article = Article.find(params[:id])
end
def new
@article = Article.new
end
def edit
@article = Article.find(params[:id])
end
def create
@article = Article.new(article_params)
#@article = Article.create(article_params)
if @article.save
redirect_to @article
else
render 'new'
end
end
def update
@article = Article.find(params[:id])
if @article.update(article_params)
redirect_to @article
else
render 'edit'
end
end
def destroy
@article = Article.find(params[:id])
@article.destroy
redirect_to articles_path
end
private
def article_params
params.require(:article).permit(:title, :text, :image)
end
end
article.rb
class Article < ApplicationRecord
has_attached_file :image, styles: { medium: "300x300>", thumb: "100x100>" }, default_url: "/images/:style/missing.png"
validates :attachment, :attachment_content_type => { :content_type => ['image/png', 'image/jpg']}
attr_accessor :image_file_name
has_many :comments, dependent: :destroy
validates :title, presence: true,
length: { minimum: 2 }
end
_form.html.erb
<%= form_for @article, html: { multipart: true } do |f| %>
<% if @article.errors.any? %>
<div id="error_explanation">
<h2>
<%= pluralize(@article.errors.count, "error") %> prohibited
this article from being saved:
</h2>
<ul>
<% @article.errors.full_messages.each do |msg| %>
<li>
<%= msg %>
</li>
<% end %>
</ul>
</div>
<% end %>
<p>
<%= f.label :title %><br>
<%= f.text_field :title %>
</p>
<p>
<%= f.label :text %><br>
<%= f.text_area :text %>
</p>
<p>
<%= f.label :image %><br>
<%= f.file_field :image %>
</p>
<p>
<%= f.submit %>
</p>
<% end %>
解决方案
In your article.rb model just change :attachment to :image like:
validates :image, :attachment_content_type => { :content_type => ['image/png', 'image/jpg']}
这篇关于尝试使用回形针上传图像时，Rails 出现错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！