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试图做多对多的关系。

我有两个模型，Teams 和 Matches，我正在做一个多对多的关系，但在尝试保存嵌套模型时出现此错误。

'找不到 ID=2 的团队以匹配 ID='

我知道我的模型是新的，所以它还没有 id，但我正在使用 Match.new(params[:match] 应该可以工作的方法。

Team:
class Team < ActiveRecord::Base
  attr_accessible :description, :name, :status

  attr_protected :id


  has_many :matchships
  has_many :matches, :through => :matchships


end

Match:
class Match < ActiveRecord::Base
  attr_accessible :date, :name

  attr_protected :id

  has_many :matchships
  has_many :teams , :through => :matchships

  accepts_nested_attributes_for :teams
end


MatchShips:
class Matchship < ActiveRecord::Base
  attr_accessible :match_id, :team_id


  belongs_to :match 
  belongs_to :team 
end


Match Controller:

New:

  def new
    @match = Match.new

    @match.teams.build

  end


Create:

  def create
 'failing here' -------->   @match = Match.new(params[:match])

    @team = Team.find(params[:team_id])
    @match.teams << @team
    @team.matches << @match

形式：

<%= nested_form_for(@match) do |f| %>
  <% if @match.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@match.errors.count, "error") %> prohibited this match from being saved:</h2>

      <ul>
      <% @match.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= f.label :name %><br />
    <%= f.text_field :name %>
  </div>
  <div class="field">
    <%= f.label :date %><br />
    <%= f.date_select :date %>
  </div>

  <%= f.fields_for :teams, :html => { :class => 'form-vertical' } do |builder| %>
  <%= builder.label "Team Name:" %>
    <%= builder.autocomplete_field :name, autocomplete_team_name_teams_path, :update_elements => {:id => "##{form_tag_id(builder.object_name, :id)}" },:class => "input-small",:placeholder => "Search" %>
  <%= builder.hidden_field :id %>

  <% end %>

  <%= f.link_to_add raw('<i class="icon-plus-sign"></i>'), :teams, :class => 'btn btn-small btn-primary' %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

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