fields_for和错误的参数个数（0表示1）错误

业余铁路程序员努力使用fields_for表单生成器。我的rails应用程序（在v = 2.3.11上）跟踪实验室协议和这些协议上使用的动物（它们的重量等）。 我的具体问题是协议只能有一定数量的动物，但允许的数量是一个物种特有的。 嵌套表单行为应显示所有动物种类的列表以及协议允许的编号框。 模型：Protocol，Allowed_Animal，Species 物种模型 
class Species < ActiveRecord::Base
  has_many :animals, :order => "band"
  has_many :allowed_animals
end
协议模型 
class Protocol < ActiveRecord::Base
  has_and_belongs_to_many :animals, :order => "band"
  has_many :allowed_animals
  accepts_nested_attributes_for :allowed_animals
end
Allowed_Animal模型 
class AllowedAnimal < ActiveRecord::Base
  belongs_to :protocol
  has_one :species
end
allowed_animal表包括： 
id, protocol_id, species_id, number, created_at, updated_at
嵌套表单的工作方式如下： 
<% form_for(@protocol) do |f| %>
  <%= f.error_messages %>

  <p>
    <%= f.label :title %><br />
    <%= f.text_field :title %>
  </p>
  <p>
    <%= f.label :number %><br />
    <%= f.text_field :number %>
  </p>

  <p>
    Number of animals allowed on protocol:
  </p>
  <div class="left_indent">
    <table>
      <% f.fields_for :allowed_animals, Species.all do |a| %>
      <tr>
        <td><i><%= a.object[:name] %></i></td>
        <td><%= a.text_field :number, :value => @protocol.allowed_animals(a), :size=>2 %></td>
        <%= a.text_field :species_id, :value => a.object[:id], :hidden => true %>
      </tr>
      <% end %>
    </table>
  </div>

  <p>
    Users on protocol:
  </p>
  <div class="left_indent">
    <%= render :partial => 'protocols/users_on_protocol_form', :locals =>{:protocol => @protocol, :users => User.current} %>
  </div>

  <p>
    <%= f.submit 'Save' %>
  </p>
<% end %>
表单显示我希望如何，但提交后，我收到错误： 
wrong number of arguments (0 for 1)
在尝试执行的控制器中： 
@protocol = Protocol.new(params[:protocol])
我不知道从哪里开始。我的模型中是否需要构建方法？或者我需要在控制器中执行任何特殊操作？我的form_builder代码是否有问题以及它如何遍历物种？ 有任何想法吗？ 应用跟踪： 
/var/lib/gems/1.8/gems/activerecord-2.3.11/lib/active_record/nested_attributes.rb:343:in `allowed_animals'
/var/lib/gems/1.8/gems/activerecord-2.3.11/lib/active_record/nested_attributes.rb:343:in `send'
/var/lib/gems/1.8/gems/activerecord-2.3.11/lib/active_record/nested_attributes.rb:343:in `assign_nested_attributes_for_collection_association'
/var/lib/gems/1.8/gems/activerecord-2.3.11/lib/active_record/nested_attributes.rb:244:in `allowed_animals_attributes='
/var/lib/gems/1.8/gems/activerecord-2.3.11/lib/active_record/base.rb:2918:in `send'
/var/lib/gems/1.8/gems/activerecord-2.3.11/lib/active_record/base.rb:2918:in `assign_attributes'
/var/lib/gems/1.8/gems/activerecord-2.3.11/lib/active_record/base.rb:2914:in `each'
/var/lib/gems/1.8/gems/activerecord-2.3.11/lib/active_record/base.rb:2914:in `assign_attributes'
/var/lib/gems/1.8/gems/activerecord-2.3.11/lib/active_record/base.rb:2787:in `attributes='
/var/lib/gems/1.8/gems/activerecord-2.3.11/lib/active_record/base.rb:2477:in `initialize'
/media/Data/Animal-Record-Keeping/app/controllers/protocols_controller.rb:42:in `new'
/media/Data/Animal-Record-Keeping/app/controllers/protocols_controller.rb:42:in `create'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/base.rb:1333:in `send'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/base.rb:1333:in `perform_action_without_filters'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/filters.rb:617:in `call_filters'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/filters.rb:610:in `perform_action_without_benchmark'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
/var/lib/gems/1.8/gems/activesupport-2.3.11/lib/active_support/core_ext/benchmark.rb:17:in `ms'
/var/lib/gems/1.8/gems/activesupport-2.3.11/lib/active_support/core_ext/benchmark.rb:17:in `ms'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/rescue.rb:160:in `perform_action_without_flash'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/flash.rb:151:in `perform_action'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/base.rb:532:in `send'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/base.rb:532:in `process_without_filters'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/filters.rb:606:in `process'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/base.rb:391:in `process'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/base.rb:386:in `call'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/routing/route_set.rb:438:in `call'
参数： 
{"commit"=>"Save",
 "protocol"=>{"number"=>"Test number",
 "start_date(1i)"=>"2011",
 "start_date(2i)"=>"4",
 "title"=>"Test title",
 "start_date(3i)"=>"12",
 "flight_exempt"=>"0",
 "allowed_animals_attributes"=>{"0"=>{"number"=>"7",
 "id"=>"2",
 "species_id"=>"2"},
 "1"=>{"number"=>"11",
 "id"=>"3",
 "species_id"=>"3"},
 "2"=>{"number"=>"13",
 "id"=>"4",
 "species_id"=>"4"},
 "3"=>{"number"=>"17",
 "id"=>"5",
 "species_id"=>"5"}},
 "summary"=>"Test summary"},
 "user_id"=>{"33"=>"0",
 "6"=>"0",
 "14"=>"0",
 "9"=>"0",
 "37"=>"0",
 "38"=>"0",
 "1"=>"1",
 "39"=>"0",
 "40"=>"0",
 "18"=>"0",
 "31"=>"0",
 "21"=>"0",
 "32"=>"0",
 "5"=>"0"}}
开发日志 
# Logfile created on Tue Apr 12 18:11:11 -0400 2011DEPRECATION WARNING: Giving :session_key to SessionStore is deprecated, please use :key instead. (called from new at /var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/middleware_stack.rb:72)
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DEPRECATION WARNING: Giving :session_key to SessionStore is deprecated, please use :key instead. (called from new at /var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/middleware_stack.rb:72)
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Processing ProtocolsController#new (for 127.0.0.1 at 2011-04-12 18:11:14) [GET]
::: Checking session expiry
::: Session has not expired. Reinitialising.
::: Initializing session expiry. Expires at Tue Apr 12 18:26:14 -0400 2011
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Rendering protocols/new
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Completed in 280ms (View: 266, DB: 4) | 200 OK [http://localhost/protocols/new]
DEPRECATION WARNING: Giving :session_key to SessionStore is deprecated, please use :key instead. (called from new at /var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/middleware_stack.rb:72)
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Processing ProtocolsController#create (for 127.0.0.1 at 2011-04-12 18:11:43) [POST]
  Parameters: {"commit"=>"Save", "protocol"=>{"start_date(1i)"=>"2011", "number"=>"Test Number", "start_date(2i)"=>"4", "start_date(3i)"=>"12", "title"=>"Test Title", "allowed_animals_attributes"=>{"0"=>{"number"=>"7", "id"=>"2", "species_id"=>"2"}, "1"=>{"number"=>"11", "id"=>"3", "species_id"=>"3"}, "2"=>{"number"=>"13", "id"=>"4", "species_id"=>"4"}, "3"=>{"number"=>"17", "id"=>"5", "species_id"=>"5"}}, "flight_exempt"=>"0", "summary"=>"Test Summary"}, "user_id"=>{"6"=>"0", "33"=>"0", "9"=>"0", "14"=>"0", "37"=>"0", "38"=>"0", "40"=>"0", "39"=>"0", "1"=>"1", "18"=>"0", "31"=>"0", "32"=>"0", "21"=>"0", "5"=>"0"}}
::: Checking session expiry
::: Session has not expired. Reinitialising.
::: Initializing session expiry. Expires at Tue Apr 12 18:26:43 -0400 2011
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ArgumentError (wrong number of arguments (0 for 1)):
  app/controllers/protocols_controller.rb:42:in `new'
  app/controllers/protocols_controller.rb:42:in `create'
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  /var/lib/gems/1.8/gems/ruby-debug-ide-0.4.9/bin/rdebug-ide:87
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  /var/lib/gems/1.8/bin/rdebug-ide:19

Rendered rescues/_trace (46.0ms)
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Rendering rescues/layout (internal_server_error)
    
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    我发现问题是我在我的协议模型中有一个函数，其名称与我试图嵌套的模型（AllowedAnimal）相同。当调用protocol.allowed_animals时，它调用函数（没有足够的参数）而不是返回嵌套的fields_for。 我还必须在允许的动物模型中将关系更改为belongs_to，以使我的allowed_animal.species工作： 
    class AllowedAnimal < ActiveRecord::Base
  belongs_to :protocol
  belongs_to :species
end
    并在我的模型中添加一个方法来为新协议构建allowed_animals： 
    def build_allowed_animals
  abs = Array.new
  for sp in Species.all
    ab = AllowedAnimal.new
    ab.species = sp
    ab.number = 0
    abs << ab
  end
  self.allowed_animals = abs
end
    在我的协议控制器中调用该方法： 
    def new
  @protocol = Protocol.new
  @protocol.build_allowed_bats
  respond_to do |format|
    format.html # new.html.erb
    format.xml  { render :xml => @protocol }
  end
end
    并对我的表单进行一些编辑： 
    <% form_for(@protocol) do |f| %>
  <%= f.error_messages %>

  <p>
    <%= f.label :title %><br />
    <%= f.text_field :title %>
  </p>
  <p>
    <%= f.label :number %><br />
    <%= f.text_field :number %>
  </p>

  <p>
    Number of animals allowed on protocol:
  </p>
  <div class="left_indent">
    <table>
      <% f.fields_for :allowed_animals do |a| %>
        <tr>
          <td><i><%= a.object.species.name %></i></td>
          <td><%= a.text_field :number, :value => @protocol.determine_allowed_animals(a.object.species), :size=>2 %></td>
          <%= a.text_field :species_id, :value => a.object.species.id, :hidden => true %>
        </tr>
      <% end %>
    </table>
  </div>

  <p>
    Users on protocol:
  </p>
  <div class="left_indent">
    <%= render :partial => 'protocols/users_on_protocol_form', :locals =>{:protocol => @protocol, :users => User.current} %>
  </div>

  <p>
    <%= f.submit 'Save' %>
  </p>
<% end %>
        
    2019-11-05 0 0
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    抵舵

    在rails 3中，你应该写： 
    <%= f.fields_for :allowed_animals do |a| %>
        
    2019-11-05 0 0
    分享
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