Question

当通过Ajax替换部分时，一种方法给我正确的结果，但另一种方法（几乎相同）不是。我想为特定广告系列选择和取消选择一个组。选择给我一个直接的替代，取消选择没有。

模型/ general_connection.rb

belongs_to :campaign
belongs_to :group

模型/ group.rb

has_many :general_connections
has_many :campaigns, through: :general_connections

模型/ campaign.rb

has_many :general_connections
has_many :groups, through: :general_connections

控制器/ general_connection.rb

def connect_group_to_campaign
  @group = Group.find(params[:group_id])
  @campaign = Campaign.find(params[:campaign_id])
  @campaign.general_connections.create(group: @group)
  respond_to do |format|
        format.html { redirect_to :back }
        format.js
  end
end

def disconnect_group_from_campaign
  @general_connection = GeneralConnection.where("group_id = ? AND campaign_id = ?", params[:group_id], params[:campaign_id]).first
  @group = @general_connection.group

  @general_connection.destroy
  respond_to do |format|
        format.html { redirect_to :back }
        format.js
  end
end

视图/运动/ show.html.erb

<div class="row">
    <% @main_groups.each do |group| %>
        <%= render partial: 'groups_form', locals: { group: group } %>
    <% end %>
</div>

*视图/运动/ _groups_form.html.erb

<div class="row" id="group_<%= group.id %>">
    <div class="col m6">
        <div class="valign-wrapper black-text">
            <% if group.icon.nil? %>
                <i class="material-icons">group</i>
            <% else %>
                <i class="material-icons"><%= group.icon %></i>
            <% end %>
                &nbsp;&nbsp<%= group.title %>
        </div>
    </div>
    <div class="col m6">
        <% if !grouped(group) %>                
            <%= form_tag connect_group_to_campaign_path(:group_id => group.id, :campaign_id => @campaign.id), remote: true do %>
                <%= button_tag 'check_box_outline_blank', class: "secondary-content material-icons grey-text", style: "background-color:white;border:none;" %>
            <% end %>
        <% else %>
            <%= form_tag disconnect_group_from_campaign_path(:group_id => group.id, :campaign_id => @campaign.id), remote: true do %>
                <%= button_tag 'check_box', class: "secondary-content material-icons grey-text", style: "background-color:white;border:none;" %>
            <% end %>
        <% end %>
    </div>
</div>

视图/ general_connection / connect_group_to_campaign.js.erb

$('#group_<%= @group.id %>').replaceWith('<%= j render partial: 'campaigns/groups_form', locals: {group: @group} %>');

视图/ general_connection / disconnect_group_from_campaign.js.erb

$('#group_<%= @group.id %>').replaceWith('<%= j render partial: 'campaigns/groups_form', locals: {group: @group} %>');

...这是我得到的错误：

ActionView::Template::Error (undefined method `id' for nil:NilClass):
12:                     </div>
13:                     <div class="col m6">
14:                         <% if !grouped(group) %>                
15:                             <%= form_tag connect_group_to_campaign_path(:group_id => group.id, :campaign_id => @campaign.id), remote: true do %>
16:                                 <%= button_tag 'check_box_outline_blank', class: "secondary-content material-icons grey-text", style: "background-color:white;border:none;" %>
17:                             <% end %>
18:                         <% else %>

总结一下：两种方法都有效，但只有connect_group_to_campaign给出直接结果而disconnect_group_from_campaign没有，需要浏览器刷新。

任何人都可以帮助我吗？

Answer 1

似乎@campaign对象未在disconnect_group_from_campaign方法中声明。在disconnect_group_from_campaign方法

中添加以下行后尝试一下

@campaign = Campaign.find(params[:campaign_id])

在Rails 4中用AJAX替换部分：未定义的方法`id`

1 个答案: