無法存取通過當地人在Rails部分

Question

下面是從我父視圖相關區域：

<h1>New Bet</h1> 

<%= form_for :bet, url: bets_path do |f| %> 

    <% if @bet.errors.any? %> 
    <div id="error_explanation"> 
     <h2> 
     <%= pluralize(@bet.errors.count, "error") %> prohibited 
     this bet from being saved: 
     </h2> 
     <ul> 
     <% @bet.errors.full_messages.each do |msg| %> 
      <li><%= msg %></li> 
     <% end %> 
     </ul> 
    </div> 
    <% end %> 

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

    <p> 
    <%= f.label :time_completed %><br> 
    <%= f.datetime_select(:time_completed, default: 2.days.from_now) %> 
    </p> 

    <div class='picks' id='bet-<%= @bet.id %>'> 
    <h2>Picks</h2> 
    <% f.fields_for :picks do |pick_form| %> 
     <%= render :partial => '/picks/new', :locals => { :f => pick_form, :pick => pick_form.object } %> 
    <% end %> 
    <div id='new-picks'> 
    </div> 
    <p><a href='#' class='pick-add'>add a pick</a></p> 
    </div> 

    <p> 
    <%= f.submit %> 
    </p> 
<% end %> 

<%= link_to 'Back', bets_path %> 

而相應的子（分）查看：

<%# 
locals: 
    f - form context 
    pick - Pick to be displayed 
%> 

<div class='pick' id='<%= pick.id %>'> 
    <h3>Pick</h3> 
    <%= f.hidden_field :id %> 
    <p> 
    <%= f.label :sport %><br> 
    <%= f.text_field :sport %> 
    </p> 

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

    <p> 
    <%= f.label :league %><br> 
    <%= f.text_field :league %> 
    </p> 
    <p><a href='#' class='pick-remove'>Remove the pick above</a></p> 
</div> 

的我得到這個錯誤時我嘗試打開使用父視圖的路線...

undefined method `id' for nil:NilClass 

而突出顯示的行是從局部視角看。

我在這裏錯過了一些明顯的東西嗎？

---

編輯：

感謝@BroiSatse，我更新了我的控制器包括@bet.picks.build，現在看起來是這樣的：

def new 
    @bet = Bet.new 
    @bet.picks.build 
    end 

但我上線得到一個undefined method 'val' for #<Arel::Nodes::BindParam:0x007f9ab7acfbf8與另外當我打開視圖，這是一個堆棧跟蹤：

activerecord (4.2.0) lib/active_record/relation.rb:572:in `block (2 levels) in where_values_hash' 
activerecord (4.2.0) lib/active_record/relation.rb:568:in `fetch' 
activerecord (4.2.0) lib/active_record/relation.rb:568:in `block in where_values_hash' 
activerecord (4.2.0) lib/active_record/relation.rb:566:in `map' 
activerecord (4.2.0) lib/active_record/relation.rb:566:in `where_values_hash' 
activerecord (4.2.0) lib/active_record/relation.rb:579:in `scope_for_create' 
activerecord (4.2.0) lib/active_record/associations/collection_association.rb:503:in `create_scope' 
activerecord (4.2.0) lib/active_record/associations/association.rb:168:in `initialize_attributes' 
activerecord (4.2.0) lib/active_record/associations/association.rb:248:in `block in build_record' 
activerecord (4.2.0) lib/active_record/core.rb:282:in `initialize' 
activerecord (4.2.0) lib/active_record/inheritance.rb:61:in `new' 
activerecord (4.2.0) lib/active_record/inheritance.rb:61:in `new' 
activerecord (4.2.0) lib/active_record/reflection.rb:131:in `build_association' 
activerecord (4.2.0) lib/active_record/associations/association.rb:247:in `build_record' 
activerecord (4.2.0) lib/active_record/associations/collection_association.rb:136:in `build' 
activerecord (4.2.0) lib/active_record/associations/collection_proxy.rb:254:in `build' 
app/controllers/bets_controller.rb:9:in `new' 
actionpack (4.2.0) lib/action_controller/metal/implicit_render.rb:4:in `send_action' 
actionpack (4.2.0) lib/abstract_controller/base.rb:198:in `process_action' 
actionpack (4.2.0) lib/action_controller/metal/rendering.rb:10:in `process_action' 
actionpack (4.2.0) lib/abstract_controller/callbacks.rb:20:in `block in process_action' 
activesupport (4.2.0) lib/active_support/callbacks.rb:117:in `call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:117:in `call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:234:in `block in halting' 
activesupport (4.2.0) lib/active_support/callbacks.rb:234:in `call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:234:in `block in halting' 
activesupport (4.2.0) lib/active_support/callbacks.rb:169:in `call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:169:in `block in halting' 
activesupport (4.2.0) lib/active_support/callbacks.rb:169:in `call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:169:in `block in halting' 
activesupport (4.2.0) lib/active_support/callbacks.rb:234:in `call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:234:in `block in halting' 
activesupport (4.2.0) lib/active_support/callbacks.rb:169:in `call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:169:in `block in halting' 
activesupport (4.2.0) lib/active_support/callbacks.rb:92:in `call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:92:in `_run_callbacks' 
activesupport (4.2.0) lib/active_support/callbacks.rb:734:in `_run_process_action_callbacks' 
activesupport (4.2.0) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (4.2.0) lib/abstract_controller/callbacks.rb:19:in `process_action' 
actionpack (4.2.0) lib/action_controller/metal/rescue.rb:29:in `process_action' 
actionpack (4.2.0) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action' 
activesupport (4.2.0) lib/active_support/notifications.rb:164:in `block in instrument' 
activesupport (4.2.0) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
activesupport (4.2.0) lib/active_support/notifications.rb:164:in `instrument' 
actionpack (4.2.0) lib/action_controller/metal/instrumentation.rb:30:in `process_action' 
actionpack (4.2.0) lib/action_controller/metal/params_wrapper.rb:250:in `process_action' 
activerecord (4.2.0) lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
actionpack (4.2.0) lib/abstract_controller/base.rb:137:in `process' 
actionview (4.2.0) lib/action_view/rendering.rb:30:in `process' 
actionpack (4.2.0) lib/action_controller/metal.rb:195:in `dispatch' 
actionpack (4.2.0) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch' 
actionpack (4.2.0) lib/action_controller/metal.rb:236:in `block in action' 
actionpack (4.2.0) lib/action_dispatch/routing/route_set.rb:73:in `call' 
actionpack (4.2.0) lib/action_dispatch/routing/route_set.rb:73:in `dispatch' 
actionpack (4.2.0) lib/action_dispatch/routing/route_set.rb:42:in `serve' 
actionpack (4.2.0) lib/action_dispatch/journey/router.rb:43:in `block in serve' 
actionpack (4.2.0) lib/action_dispatch/journey/router.rb:30:in `each' 
actionpack (4.2.0) lib/action_dispatch/journey/router.rb:30:in `serve' 
actionpack (4.2.0) lib/action_dispatch/routing/route_set.rb:802:in `call' 
warden (1.2.3) lib/warden/manager.rb:35:in `block in call' 
warden (1.2.3) lib/warden/manager.rb:34:in `catch' 
warden (1.2.3) lib/warden/manager.rb:34:in `call' 
rack (1.6.0) lib/rack/etag.rb:24:in `call' 
rack (1.6.0) lib/rack/conditionalget.rb:25:in `call' 
rack (1.6.0) lib/rack/head.rb:13:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/params_parser.rb:27:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/flash.rb:260:in `call' 
rack (1.6.0) lib/rack/session/abstract/id.rb:225:in `context' 
rack (1.6.0) lib/rack/session/abstract/id.rb:220:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/cookies.rb:560:in `call' 
activerecord (4.2.0) lib/active_record/query_cache.rb:36:in `call' 
activerecord (4.2.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:647:in `call' 
activerecord (4.2.0) lib/active_record/migration.rb:378:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:88:in `call' 
activesupport (4.2.0) lib/active_support/callbacks.rb:88:in `_run_callbacks' 
activesupport (4.2.0) lib/active_support/callbacks.rb:734:in `_run_call_callbacks' 
activesupport (4.2.0) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (4.2.0) lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/reloader.rb:73:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/remote_ip.rb:78:in `call' 
web-console (2.0.0) lib/action_dispatch/debug_exceptions.rb:18:in `middleware_call' 
web-console (2.0.0) lib/action_dispatch/debug_exceptions.rb:13:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call' 
railties (4.2.0) lib/rails/rack/logger.rb:38:in `call_app' 
railties (4.2.0) lib/rails/rack/logger.rb:20:in `block in call' 
activesupport (4.2.0) lib/active_support/tagged_logging.rb:68:in `block in tagged' 
activesupport (4.2.0) lib/active_support/tagged_logging.rb:26:in `tagged' 
activesupport (4.2.0) lib/active_support/tagged_logging.rb:68:in `tagged' 
railties (4.2.0) lib/rails/rack/logger.rb:20:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/request_id.rb:21:in `call' 
rack (1.6.0) lib/rack/methodoverride.rb:22:in `call' 
rack (1.6.0) lib/rack/runtime.rb:18:in `call' 
activesupport (4.2.0) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call' 
rack (1.6.0) lib/rack/lock.rb:17:in `call' 
actionpack (4.2.0) lib/action_dispatch/middleware/static.rb:113:in `call' 
rack (1.6.0) lib/rack/sendfile.rb:113:in `call' 
railties (4.2.0) lib/rails/engine.rb:518:in `call' 
railties (4.2.0) lib/rails/application.rb:164:in `call' 
rack (1.6.0) lib/rack/lock.rb:17:in `call' 
rack (1.6.0) lib/rack/content_length.rb:15:in `call' 
rack (1.6.0) lib/rack/handler/webrick.rb:89:in `service' 
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service' 
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run' 
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread' 

我的賭注模型：

class Bet < ActiveRecord::Base 
    has_many :picks, dependent: :destroy 
    accepts_nested_attributes_for :picks 

    validates :odds, presence: true, numericality: true # { only_integer: true } 
    validates :time_completed, presence: true 
end 

我的選擇模式：

class Pick < ActiveRecord::Base 
    belongs_to :bet 

    validates :team, presence: true #, length: { minimum: 1 } 
    validates :sport, presence: true, inclusion: { :in => ['Basketbal', 'Ice Hockey'] } 
    validates :league, presence: true, inclusion: { :in => %w(NBA NHL) } 
end 

Answer 1

有你的控制器定義@bet變量？如果是這樣，請將您的form_for更改爲form_for @bet。您的投注模式中還需要accepts_nested_attributes_for :picks。

Answer 2

請試試這個，我希望這會幫助你

<% f.fields_for :picks do |pick_form| %> 
    <%= render :partial => '/picks/new', :f => pick_form %> 
<% end %>