Question

我是Rails的新手。我想通过控制器将参数传递给DB，但是我收到此错误参数缺失或值为空：转推。我认为问题是在视图中传递参数的方式。

这是视图

     <% for @p in @posts %>

    <div class="panel panel-default post-panel">
      <div class="panel-body row">

        <div class="col-sm-1">
          <img src="/avatar.png" class="rounded-img" height="50px" width="50px">
        </div>
        <div class="col-sm-11">
          <p class="post-title"><a href="/user/<%= User.find(@p.user_id).username %>" class="post-owner"><%= User.find(@p.user_id).username %></a> <span class="post-creation">- <%= @p.created_at.to_formatted_s(:short) %></span></p>
          <p class="post-content"><%= @p.content %></p>
        </div>
        <div class="col-sm-12">
          <p class="post-links">
            <span class="glyphicon glyphicon-comment g-links" aria-hidden="true"></span>


            **<%= form_for Retweet.new do |f| %>
                <%= hidden_field_tag current_user.id, (:user_id) %>
                <%= hidden_field_tag @p.id, (:post_id) %>
              <%= f.submit "Retweet",   class:"btn btn-primary"%>**


            <% end %>

这是控制器

   def new
      @retweet = Retweet.new
   end

   def create
              @retweet = Retweet.new(post_params)
               redirect_to(:back)
     end

    private def post_params 
           params.require(:retweet).permit(:user_id, :post_id)
     end
 end

Answer 1

您应该阅读有关Rails中基本REST控制器的一些教程。您的创建操作未保存转推。

def create
  @retweet = Retweet.new(post_params)
  if @retweet.save
    redirect_to(:back)
  else
    render action: 'new'
  end
 end

编辑：刚刚发现你的表格错了：

  <%= form_for Retweet.new do |f| %>
    <%= f.hidden_field :user_id, current_user.id %>
    <%= f.hidden_field :post_id, @p.id %>
    <%= f.submit "Retweet", class:"btn btn-primary"%>**
  <% end %>

请注意，您不应该像这样设置settign user_id，它很容易更改它，从而弄乱您的数据。相反，您应该将其添加到retweet#create：

@retweet.user = current_user

错误：缺少param或值为空：转推

1 个答案: