ActionController：：在提交时

Question

我有一个程序，允许用户为某一事件输入他们的歌曲。您必须输入该事件的partycode才能提交。下面是它的截图：

​

当我提交它时，会出现以下错误：

​

下面是我的SongsController的样子：

class SongsController < ApplicationController

    def new
        @song = Song.new
    end

    def create
        current_event = Event.find(song_params[:event_id])
        @song = current_event.songs.build(song_params)
        if @song.save
            flash[:success] = "Success"
            redirect_to event_path(@song.event)
        else
            flash[:error] = "Failed"
        end

    end

    def destroy
    end
    private

      def song_params
        params.require(:song).permit(:event_id, :artist, :title, :genre)
      end
end

事件模型

class Event < ApplicationRecord
  belongs_to :user
  validates :name, presence: true
  validates :partycode, presence: true, length: {minimum: 5}
  has_many :songs, dependent: :destroy  

end

宋模型

class Song < ApplicationRecord
  belongs_to :event
  validates :artist, presence: true
  validates :title,  presence: true
end

New.html.erb(歌曲)

<br>
<br>
<h1> Member page </h1>
<div class ="container">
  <div class="jumbotron">
    <h2> Select an event to add songs to: </h2>
    <%= form_for Song.new do |f| %>
        <%= f.collection_select(:event_id, Event.all, :id, :name) %>
    <h3> Enter your song </h3>
    <%= form_for Song.new do |f| %>
      <%= f.text_field :artist, placeholder: "Artist" %>
      <%= f.text_field :title,  placeholder: "Title" %>
      <%= f.text_field :genre,  placeholder: "Genre" %>
    <h2> Enter the partycode for that event: </h2>
    <%= form_for Event.new do |f| %>
      <%= f.text_field :partycode %>
      <%= f.submit "Submit", class: "btn btn-primary" %>
    <% end %>
    <% end %>
    <% end %>
  </div>
</div>

我怎样才能使我的网站的这一功能发挥作用？任何帮助都是非常感谢的

Answer 1

我看到许多form_for嵌套在您的视图上。不可能的。只提交一份表格。

我想你可能想改变你的_form.html.erb

<div class ="container">
  <div class="jumbotron">
    <h2> Select an event to add songs to: </h2>
    <%= form_for @song do |f| %>
      <%= f.collection_select(:event_id, Event.all, :id, :name) %>
      <h3> Enter your song </h3>
      <%= f.text_field :artist, placeholder: "Artist" %>
      <%= f.text_field :title,  placeholder: "Title" %>
      <%= f.text_field :genre,  placeholder: "Genre" %>
      <h2> Enter the partycode for that event: </h2>
      <%= f.text_field :partycode %>
      <%= f.submit "Submit", class: "btn btn-primary" %>
    <% end %>
  </div>
</div>

Answer 2

你完全搞砸了你的表格。理想情况下，您应该有一个表单，但是在这里，您只是使用form_for将一个表单保存在另一个表单中。

我建议你看看form_for documentation。