业余 Rails 程序员努力使用 fields_for 表单构建器。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中使用的动物（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，但允许的数量是特定于一个物种的。
嵌套表单行为应显示所有动物种类的列表和协议允许的数量的编辑框。
模型：协议、Allowed_Animal、物种
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_动物模型
class AllowedAnimal < ActiveRecord::Base
belongs_to :protocol
has_one :species
end
allowed_animal 的表包括：
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 %>
该表单显示了我想要的方式，但提交后，我收到错误：
wrong number of arguments (0 for 1)
在控制器中尝试执行以下操作：
@protocol = Protocol.new(params[:protocol])
我不知道从这里去哪里。我的模型中是否需要有构建方法？或者我需要在我的控制器中做一些特别的事情吗？我的 form_builder 代码以及它如何遍历物种有问题吗？
有任何想法吗？
应用程序跟踪：
/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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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"}}
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