我可以在我的控制台中看到我所做的部分erorr_messages正在渲染,如果注释没有通过验证,那么它将不会被发布,但我无法获取实际的错误内容来呈现。
错误部分:
<% if object.errors.any? %>
<div id="error_explanation">
<div class="alert alert-danger">
The form contains <%= pluralize(object.errors.count, "error") %>
</div>
<ul>
<% object.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
评论表
<%= form_for @comment, url: comments_path do |f| %>
<%= render 'shared/error_messages', object: f.object %>
<%= f.hidden_field :user_id, value: current_user.id %>
<%= f.hidden_field :post_id, value: post.id %>
<%= f.text_area :content, size: "60x2", placeholder: "Comment on this post..." %>
<%= f.submit "Comment" %>
发表表格
<%= form_for [@user, @post] do |f| %>
<%= render 'shared/error_messages', object: f.object %>
<%= f.text_area :content, size: "60x12", placeholder: "What do you want to say?" %>
<%= f.submit "Post" %>
用户/显示
<% if @user == current_user %>
<h4>Welcome <%= current_user.email %>! </h4>
<%= render "notifications" %>
<%= render 'shared/post_form' %>
<%= render 'feed' %>
<% end %>
class CommentsController < ApplicationController
def index
@comments = Comment.all
end
def new
@comment = Comment.new
@user = User.find(params[:user_id])
end
def create
@user = current_user
@comment = @user.comments.build(comment_params)
if @comment.save
flash[:success] = "Comment Posted!"
redirect_back(fallback_location: root_path)
else
flash[:danger] = "Could not post comment"
redirect_back(fallback_location: root_path)
end
end
private
def comment_params
params.require(:comment).permit(:content, :user_id, :post_id)
end
end
class PostsController < ApplicationController
def index
@posts = Post.all
@user = User.find(params[:user_id])
@comment = Comment.new
end
def new
@post = Post.new
@user = User.find(params[:user_id])
end
def create
@post = current_user.posts.build(post_params)
if @post.save
flash[:success] = "Posted!"
redirect_to user_path(current_user)
else
flash[:danger] = "Post could not be submitted"
redirect_to users_path
end
end
private
def post_params
params.require(:post).permit(:content)
end
end
答案 0 :(得分:1)
在CommentsController#create
中,当保存失败时,而不是重定向:
redirect_back(fallback_location: root_path)
尝试留在同一页面上,然后只渲染&#34; new&#34;模板:
render action: "new"
如果您重定向,浏览器将发出第二个请求,@comment
将被新建的评论覆盖。
如果你留在同一页面并呈现&#34; new&#34;模板,它将使用已加载但未能保存的@comment
实例(此实例上设置了所有验证错误)。
P.S。 Flash消息有效,因为它是flash
的用途 - 一种在会话中存储消息的方法,以便它们能够在重定向中存活。