删除数据库ROR中的多个记录时出错

Question

The following is the code in which i want to delete multiple records but getting error... my view named um_org_data in which the code from the html file name is index.html.erb

<%= form_tag destroy_um_org_data_path, method: :delete,  data: { confirm: 'Are you sure you want to delete all these?' } do %>
        <table class="table table-hover table-condensed">
          <tr>
            <th></th>
            <th>Organization Name</th>
            <th>Organization Description</th>
            <th>Office Address</th>
            <th>Office Phone Number</th>
            <th>Actions</th>
          </tr>


         <% @um_org_data.each do |um_org_data| %>
            <tr>
              <td><%= check_box_tag "deleted_ids[]", um_org_data.id %></td>
              <td><%= um_org_data.org_name %></td>
              <td><%= um_org_data.org_description%></td>
              <td><%= um_org_data.offc_addr%></td>
              <td><%= um_org_data.offc_ph%></td>
              <td>
                <%= link_to "<i class='icon-eye-open'></i>".html_safe, um_org_data,"data-original-title" => "View Details", "data-placement" => "bottom", :rel => "nofollow", :class => 'bg-color-none' %>
                <%= link_to "<i class= 'icon-edit'></i>".html_safe, edit_um_org_datum_path(um_org_data), "data-original-title" => "Edit", "data-placement" => "bottom", :rel => "nofollow", :class => 'bg-color-none'%>

                <%= link_to "<i class= 'icon-trash'></i>".html_safe, um_org_data, method: :delete, data: { confirm: 'Are you sure?' }, "data-original-title" => "Delete", "data-placement" => "bottom", :rel => "nofollow", :class => 'bg-color-none' %>



              </td>
          </tr>

        <%end%>
        </table>
        <%= button_tag(type: "submit", class: "btn") do %>
           Delete Selected <i class="icon-trash"></i>
        <% end %>
        <% end %>

and for this my controller name um_org_data_controller.rb has the following method against this action.

def destroy
    @um_org_datum = UmOrgDatum.find(params[:id])
    @um_org_datum.destroy

    respond_to do |format|
      format.html { redirect_to um_org_data_url }
      format.json { head :no_content }
    end
  end

i am facing error in the very first line of the view name index.html.erb

the following is the detail of error that i found.

NameError in Um_org_data#index

undefined local variable or method `destroy_um_org_data_path' for #<#<Class:0x00000004582a10>:0x007fa9e42f4e38>

 <%= form_tag destroy_um_org_data_path, method: :delete,  data: { confirm: 'Are you sure you want to delete all these?' } do %>
        <table class="table table-hover table-condensed">
           <tr>
             <th></th>

where as delete below in the view code is working fine...... Thanks in Advance.

now after changing in my code.....

<%= form_tag url: destroy_selected_um_org_data_path, method: :delete,  data: { confirm: 'Are you sure you want to delete all these?' } do %>
        <table class="table table-hover table-condensed">
          <tr>
            <th></th>
            <th>Organization Name</th>
            <th>Organization Description</th>
            <th>Office Address</th>
            <th>Office Phone Number</th>
            <th>Actions</th>
          </tr>


         <% @um_org_data.each do |um_org_data| %>
            <tr>
              <td><%= check_box_tag "um_org_data_ids[]", um_org_data.id %></td>
              <td><%= um_org_data.org_name %></td>
              <td><%= um_org_data.org_description%></td>
              <td><%= um_org_data.offc_addr%></td>
              <td><%= um_org_data.offc_ph%></td>
              <td>
                <%= link_to "<i class='icon-eye-open'></i>".html_safe, um_org_data,"data-original-title" => "View Details", "data-placement" => "bottom", :rel => "nofollow", :class => 'bg-color-none' %>
                <%= link_to "<i class= 'icon-edit'></i>".html_safe, edit_um_org_datum_path(um_org_data), "data-original-title" => "Edit", "data-placement" => "bottom", :rel => "nofollow", :class => 'bg-color-none'%>

                <%= link_to "<i class= 'icon-trash'></i>".html_safe, um_org_data, method: :delete, data: { confirm: 'Are you sure?' }, "data-original-title" => "Delete", "data-placement" => "bottom", :rel => "nofollow", :class => 'bg-color-none' %>



              </td>
          </tr>

        <%end%>
        </table>
        <%= button_tag(type: "submit", class: "btn") do %>
           Delete Selected <i class="icon-trash"></i>
        <% end %>
        <% end %>

the controller code is following:

def destroy_selected
    @um_org_data = UmOrgData.find(params[:um_org_data_ids])
    @um_org_data.each { |o| o.destroy }

    respond_to do |format|
      format.html { redirect_to um_org_data_url }
      format.json { head :no_content }
    end

  end

and the error is following:

 NameError in Um_org_data#index

undefined local variable or method `destroy_selected_um_org_data_path' for #<#<Class:0x00000004663bf0>:0x0000000466d3a8>

<%= form_tag url: destroy_selected_um_org_data_path, method: :delete,  data: { confirm: 'Are you sure you want to delete all these?' } do %>
        <table class="table table-hover table-condensed">
           <tr>
            <th></th>

Answer 1

The helper method for deletion that gets generated by a resource route is basically the same helper method as for the show action only with method: :delete , hence there is no destroy_* helper method.

Ie, you would use: link_to um_org_data_path(um_org_data), method: :delete

But what you're trying to achieve doesn't work that way. Since the destroy method only works on a single object (it expects an ID), not a collection of objects. So I guess you would need something like this:

# routes.rb
resources :um_org_data do
  collection do
    delete :destroy_selected
  end
end

# um_org_data_controller.rb
class UmOrgDataController < AC::Base
  def destroy_selected
    @um_org_data = UmOrgData.find(params[:um_org_data_ids])
    @um_org_data.each { |o| o.destroy }
    # ...
  end
end

# index.html.erb
<%= form_tag url: destroy_selected_um_org_data_path, method: :delete do %>
  <% @um_org_data.each do |um_org_data| %>
    <tr>
      <td><%= check_box_tag "um_org_data_ids[]", um_org_data.id %></td>
    # ...
    </tr>
  <% end %>
<% end %>

Answer 2

Your path in the following link_to is not correct:

<%= link_to "<i class= 'icon-trash'></i>".html_safe, um_org_data, method: :delete, data: { confirm: 'Are you sure?' }, "data-original-title" => "Delete", "data-placement" => "bottom", :rel => "nofollow", :class => 'bg-color-none' %>

Try to replace:

um_org_data

by

um_org_data_path(um_org_data)