Question

这是我目前得到的：

Started POST "/duels" for 127.0.0.1 at 2016-10-15 02:51:06 -0400
Processing by DuelsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"/vNueb1U+W5asQ4/Vnh5kSdeUc6uiaUKvWG1TIaAKWY0fIM2ovLlsLJUSsmgDG3nTbFgt7n8zSYYT2LkZEqLrA==", "duel"=>{"duelers_attributes"=>{"0"=>{"user_id"=>"2"}, "1"=>{"user_id"=>"15"}}, "consequence"=>"t", "reward"=>"t"}, "dueler"=>{"challenge_id"=>"141"}, "button"=>""}

只有一个challenge_id正在通过，尽管应该有两个（每个人都有一个）。如何在提交时输出以下代码以输出这样的内容：

Started POST "/duels" for 127.0.0.1 at 2016-10-15 03:33:02 -0400
Processing by DuelsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"xhbQpHgBmzfuvmYsyZx1Hss8CZBfQQN9+QCEciiq4yUMmT3rZ6eH6QZbIto/6GFoodM46Ug0a1FcLlPaymBB7w==", "duel"=>{"duelers_attributes"=>{"0"=>{"user_id"=>"2", "challenge_id"=>"141"}, "1"=>{"user_id"=>"15", "challenge_id"=>"143"}}, "consequence"=>"t", "reward"=>"t"}, "button"=>""}

duels_controller

  def new
    @duel = Duel.new
    @user = User.find(params[:challenge_daddy])
    @duel.duelers << Dueler.new(user_id: current_user.id, user_name: current_user.name, user_last_name: current_user.last_name)
    @duel.duelers << Dueler.new(user_id: @user.id, user_name: @user.name, user_last_name: @user.last_name)
    @current_user_challenges = current_user.challenges.order(:created_at)
    @challenged_user_challenges = @user.challenges.order(:created_at)
    respond_with(@duel)
  end

决斗/新

<%= simple_form_for(@duel) do |f| %>
  <%= f.fields_for(:duelers) do |dueler| %>
    <%= render 'dueler_fields', :f => dueler %>
  <% end %>
  The loser will <%= f.text_field :consequence %>
  <%= f.submit %>
<% end %>

_dueler_fields.html.erb

<%= f.select :user_id, User.order(:name).map { |user| [user.full_name, user.id] }, include_blank: true, id: "change-challenge-options" %>

<div id="current-user-challenges">
    <%= f.collection_select :challenge_id, @current_user_challenges, :id, :full_challenge, include_blank: true %>
</div>

<div id="challenged-user-challenges">
    <%= f.collection_select :challenge_id, @challenged_user_challenges, :id, :full_challenge, include_blank: true %>
</div>

<script> # If current_user then I show first collection_select otherwise I show second.
    var userSelect = $('#change-challenge-options');
    var currentUserId = $('#current-user-id').data('user-id');
    $('#challenged-user-challenges').hide();
    $('#current-user-challenges').hide();
    userSelect.on('change', function() {
      if (userSelect.val() == "0"){
         $('#current-user-challenges').hide();
         $('#challenged-user-challenges').hide();
        }
      else if (userSelect.val() == currentUserId) {
        $('#current-user-challenges').show();
        $('#challenged-user-challenges').hide();
      } else {
        $('#challenged-user-challenges').show();
        $('#current-user-challenges').hide();
      }
    });
</script>

Answer 1

如果您看到正在发送的params，您确实通过了两个挑战ID。一个来自挑战的用户，另一个来自challanger。

您只需要在控制器中更好地访问它们并将其保存在适当的位置。

{  
  "utf8"  =>"✓",
  "authenticity_token"  =>"...",
  "duel"  =>  {  
    "duelers_attributes"    =>    {  
      "0"      =>      {  
        "user_id"        =>"2",
        "challenge_id"        =>"141"
      },
      "1"      =>      {  
        "user_id"        =>"15",
        "challenge_id"        =>"143"
      }
    },
    "consequence"    =>"t",
    "reward"    =>"t"
  },
  "button"  =>""
}

我已将这些行分开以便更容易实现，但基本上在您的创建或更新方法中，您可以访问duel_params["duel]["0"]["challange_id"]并将其保存到您想要的任何位置，duel_params["duel]["1"]["challange_id"]

您还可以更新活动记录回调中的一个或另一个，例如after_save或after_validation方法，无论哪种方式最适合您

如何为两个嵌套属性保存ID？

1 个答案: