ruby-on-rails - 参数缺失或值为空 hidden_​​field_tag

Question

我在通过 form_tag 向我的 Controller 发送值时遇到问题——看起来参数丢失了，我得到了这个错误:ActionController::ParameterMissing: param is missing or the值为空:故事

<% @locations.each do |post| %>
          <div class="box col3">
             <img src="<%= post[:image] %>">
         <small>username: </small><%= post[:username]%>
         <small>posted date: </small><%= post[:created_time] %>
         <small>place: </small><%= post[:place] %>
         <small>tags: </small> <%= post[:hash_tags] %>
         <small>lat: </small> <%= post[:lat] %>
         <small>lg: </small> <%= post[:lg] %>
         <div class="like-button">
            <%= form_tag('/stories/create', remote: true) do  %>
              <%= hidden_field_tag 'avatar', "#{post[:image]}" %>
              <%= hidden_field_tag 'description', "#{post[:username]}" %>
              <%= submit_tag "Like", class: "btn btn-warning like-button" %>
            <% end %>
         </div>
          </div>
<%end%>

@locations 是一个哈希数组。

例如 @locations.first yield:

{:lat=>40.7519798,
 :lg=>-73.9475174,
 :place=>"Z Hotel NY",
 :profile_picture=>
  "http://photos-g.ak.instagram.com/hphotos-ak-xtp1/t51.2885-19/s150x150/12105211_896812917070398_1478405438_a.jpg",
 :hash_tags=>[],
 :username=>"dannessex90",
 :fullname=>"Dann Essex",
 :created_time=>"2015-11-02 22:41:25 -0500",
 :image=>
  "https://scontent.cdninstagram.com/hphotos-xaf1/t51.2885-15/s320x320/e35/11421986_972505559476106_241708523_n.jpg"}

故事 Controller :

class StoriesController < ApplicationController

    def index
        @stories = Story.all
    end

    def show

    end

    def new
        @story = Story.new
    end

    def edit

    end

    def create
        current_location = request.remote_ip
        binding.pry
        coordinates = Location.get_coord(story_params[:location])
        params = {description: story_params[:description], location: story_params[:location], latitude: coordinates[0], longitude: coordinates[1], avatar: story_params[:avatar]}
        @story = current_user.stories.build(params)
        if @story.save

            redirect_to url_for(:controller => :users, :action => :my_stories)
        else
            render 'searches/result'
        end
    end

    private

    def story_params
        params.require(:story).permit(:description, :location, :avatar, :tag_list)

    end
end

知道出了什么问题吗？

Answer 1

发生这种情况是因为您已通过 strong_params 指定在您的参数中需要 story，即在您的 story_params 方法中。

View 端未传递嵌套在 story 参数下的参数。这就是您收到此错误的原因。

要解决此问题，您可以将 story_params 方法更改为此(没有 require(:story) 部分，因为您没有在 Controller 中使用它) :

def story_params
   params.permit(:description, :location, :avatar, :tag_list)
end