Ruby on Rails:如果帖子没有保存,我将如何留在同一页面？

Question

def create
    @addpost = Post.new params[:data]
    if @addpost.save
        flash[:notice] = "Post has been saved successfully."
        redirect_to posts_path
    else
        flash[:notice] = "Post can not be saved, please enter information."
    end
end

如果帖子没有保存,那么它会重定向到http://0.0.0.0:3000/posts,但我需要留在页面上,带有文本输入字段,以便用户可以输入数据.

发布模型

class Post < ActiveRecord::Base

    has_many :comments
    validates :title, :presence => true
    validates :content, :presence => true
    validates :category_id, :presence => true
    validates :tags, :presence => true
end

新方法

def new
    @arr_select = { 1=>"One",2=>"Two" ,3=>"Three" }
    @categories_select = Category.all.collect {|c| [ c.category_name, c.id ] }
end

new.html.erb

<h3>Add post</h3>

<%= form_tag :controller=>'posts', :action=>'create' do %>
    <%= label :q, :Title %>
    <%= text_field :data, :title, :class => :addtextsize %><br/>
    <%= label :q, :Content %>
    <%= text_area  :data, :content, :rows=>10 , :class => :addtextarea %><br/>
    <%= label :q, :Category %>
    <%= select :data, :category_id, @categories_select %><br/>
    <%= label :q, :Tags %>
    <%= text_field :data, :tags, :class => :addtextsize %><br/>
    <%= label :q, :Submit %>
    <%= submit_tag "Add Post" %>
<% end %>

我该怎么办 ？

Answer 1

flash.now同render是你在找什么.

flash.now[:notice] = "Post can not be saved, please enter information."
render :new

而不是

flash[:notice] = "Post has been saved successfully."
redirect_to posts_path

你可以写

redirect_to posts_path, :notice => "Post has been saved successfully."

它会做同样的事情.它只适用于redirect_to,而不是渲染!

Answer 2

这样的事情应该做你想要的:

flash[:notice] = "Post can not be saved, please enter information."
render :new

更新:您更新了您的问题,所以我必须更新我的答案.渲染是执行此操作的正确方法.但是,看起来您在new方法中加载了一些类别和其他一些东西.您的create方法应该可以使用这些相同的实例变量.要做到这一点,最彻底的方法是把它们变成另一种方法,并有用作方法before_filter应用到create和new.像这样的东西:

before_filter :load_stuff, :only => [:create, :new]

def load_stuff
  @arr_select = { 1=>"One",2=>"Two" ,3=>"Three" }
  @categories_select = Category.all.collect {|c| [ c.category_name, c.id ] }
end

然后你的new方法几乎是空白的,并且调用render :new你的create方法应该可行.