关于Rails 3：Rails 3 – has_many通过嵌套表单

Rails 3 - has_many through with nested form

我正在尝试使用嵌套表单，但在保存时不断收到此错误 -

1	uninitialized constant User::Userplan

这是我的型号代码 -

用户

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class User < ActiveRecord::Base
has_many :userplans
has_many :plans, :through => :userplans
accepts_nested_attributes_for :userplans

UserPlan

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class UserPlan < ActiveRecord::Base
belongs_to :plan
belongs_to :user

计划

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class Plan < ActiveRecord::Base
has_many :userplans
has_many :users, :through => :userplans

形成

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<%= form_for(@user) do |f| %>
<%= hidden_field_tag"user[userplans][plan_id]", 2 %>
<%= f.text_field :first_name %>
</p>

我知道使用hidden_??field_tag是错误的，但我不确定更好的方法

谢谢你的帮助！

activerecord(3.0.3)lib / active_record / associations / association_proxy.rb：260：在raise_on_type_mismatch'
activerecord (3.0.3) lib/active_record/associations/association_collection.rb:352:in块中替换'
activerecord(3.0.3)lib / active_record / associations / association_collection.rb：352：in each'
activerecord (3.0.3) lib/active_record/associations/association_collection.rb:352:in replace'
activerecord(3.0.3)lib / active_record / associations.rb：1524：in block in collection_accessor_methods'
activerecord (3.0.3) lib/active_record/base.rb:1559:in block in attributes ='
activerecord(3.0.3)lib / active_record / base.rb：1555：in each'
activerecord (3.0.3) lib/active_record/base.rb:1555:in attributes ='
cancan(1.4.1)lib / cancan / controller_resource.rb:72:in build_resource'
cancan (1.4.1) lib/cancan/controller_resource.rb:48:in load_resource_instance'
cancan(1.4.1)lib / cancan / controller_resource.rb：30：in load_resource'
cancan (1.4.1) lib/cancan/controller_resource.rb:24:in load_and_authorize_resource'
cancan(1.4.1)lib / cancan / controller_resource.rb：9：in block in add_before_filter'
activesupport (3.0.3) lib/active_support/callbacks.rb:436:in run_3988671192319902872__process_action_982103756142273942_callbacks'
activesupport(3.0.3)lib / active_support / callbacks.rb：409：in _run_process_action_callbacks'
activesupport (3.0.3) lib/active_support/callbacks.rb:93:in run_callbacks'
actionpack(3.0.3)lib / abstract_controller / callbacks.rb：17：在process_action中的process_action'
actionpack (3.0.3) lib/action_controller/metal/instrumentation.rb:30:in块中
activesupport(3.0.3)lib / active_support / notifications.rb:52:in block in instrument'
activesupport (3.0.3) lib/active_support/notifications/instrumenter.rb:21:in instrument'
activesupport(3.0.3)lib / active_support / notifications.rb:52:in instrument'
actionpack (3.0.3) lib/action_controller/metal/instrumentation.rb:29:in process_action'
actionpack(3.0.3)lib / action_controller / metal / rescue.rb:17:in process_action'
actionpack (3.0.3) lib/abstract_controller/base.rb:120:in process'
actionpack(3.0.3)lib / abstract_controller / rendering.rb：40：in process'
actionpack (3.0.3) lib/action_controller/metal.rb:138:in dispatch'
actionpack(3.0.3)lib / action_controller / metal / rack_delegation.rb:14:in dispatch'
actionpack (3.0.3) lib/action_controller/metal.rb:178:in block in action'
actionpack(3.0.3)lib / action_dispatch / routing / route_set.rb:62:in call'
actionpack (3.0.3) lib/action_dispatch/routing/route_set.rb:62:in dispatch'
actionpack(3.0.3)lib / action_dispatch / routing / route_set.rb:27:in call'
rack-mount (0.6.13) lib/rack/mount/route_set.rb:148:in block in call'
rack-mount(0.6.13)lib / rack / mount / code_generation.rb:93:in block in recognize'
rack-mount (0.6.13) lib/rack/mount/code_generation.rb:75:in optimized_each'
rack-mount(0.6.13)lib / rack / mount / code_generation.rb:92:in recognize'
rack-mount (0.6.13) lib/rack/mount/route_set.rb:139:in call'
actionpack(3.0.3)lib / action_dispatch / routing / route_set.rb：492：在call'
warden (1.0.2) lib/warden/manager.rb:35:in块中调用'
warden(1.0.2)lib / warden / manager.rb:34:in catch'
warden (1.0.2) lib/warden/manager.rb:34:in call'
actionpack(3.0.3)lib / action_dispatch / middleware / best_standards_support.rb:17:in call'
actionpack (3.0.3) lib/action_dispatch/middleware/head.rb:14:in call'
rack(1.2.1)lib / rack / methodoverride.rb:24:in call'
actionpack (3.0.3) lib/action_dispatch/middleware/params_parser.rb:21:in call'
actionpack(3.0.3)lib / action_dispatch / middleware / flash.rb:182:in call'
actionpack (3.0.3) lib/action_dispatch/middleware/session/abstract_store.rb:149:in call'
actionpack(3.0.3)lib / action_dispatch / middleware / cookies.rb：295：在call'
activerecord (3.0.3) lib/active_record/query_cache.rb:32:in块中调用'
activerecord(3.0.3)lib / active_record / connection_adapters / abstract / query_cache.rb:28:in cache'
activerecord (3.0.3) lib/active_record/query_cache.rb:12:in cache'
activerecord(3.0.3)lib / active_record / query_cache.rb:31:in call'
activerecord (3.0.3) lib/active_record/connection_adapters/abstract/connection_pool.rb:353:in call'
actionpack(3.0.3)lib / action_dispatch / middleware / callbacks.rb:46:in block in call'
activesupport (3.0.3) lib/active_support/callbacks.rb:415:in _run_call_callbacks'
actionpack(3.0.3)lib / action_dispatch / middleware / callbacks.rb:44:in call'
rack (1.2.1) lib/rack/sendfile.rb:107:in call'
actionpack(3.0.3)lib / action_dispatch / middleware / remote_ip.rb:48:in call'
actionpack (3.0.3) lib/action_dispatch/middleware/show_exceptions.rb:46:in call'
railties(3.0.3)lib / rails / rack / logger.rb:13:in call'
rack (1.2.1) lib/rack/runtime.rb:17:in call'
activesupport(3.0.3)lib / active_support / cache / strategy / local_cache.rb:72:in call'
rack (1.2.1) lib/rack/lock.rb:11:in block in call'
：10：在synchronize'
rack (1.2.1) lib/rack/lock.rb:11:in调用'
actionpack(3.0.3)lib / action_dispatch / middleware / static.rb:30:in call'
railties (3.0.3) lib/rails/application.rb:168:in call'
railties(3.0.3)lib / rails / application.rb:77:in method_missing'
railties (3.0.3) lib/rails/rack/log_tailer.rb:14:in call'
rack(1.2.1)lib / rack / content_length.rb:13:in call'
rack (1.2.1) lib/rack/handler/webrick.rb:52:in service'
/Users/joshcrowder/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/webrick/httpserver.rb:111:in service'
/Users/joshcrowder/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/webrick/httpserver.rb:70:in run'
/Users/joshcrowder/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/webrick/server.rb:183:in在start_thread中的块'

我认为您的问题在于您的关联命名。由于你的UserPlan模型是CamelCased < - 就像那样，Rails'将它的名称列入:user_plans，而不是:userplan。正如您所看到的，您的错误源于Rails无法找到UserPlan，而应该查找UserPlan。

用户：

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class User < ActiveRecord::Base
has_many :user_plans
has_many :plans, :through => :user_plans
accepts_nested_attributes_for :user_plans

计划：

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class Plan < ActiveRecord::Base
has_many :user_plans
has_many :users, :through => :user_plans

视图：

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<%= form_for(@user) do |f| %>
<%= hidden_field_tag"user[user_plans][plan_id]", 2 %>
<%= f.text_field :first_name %>
</p>

关于hidden_field_tag，你究竟想做什么？也许你应该打开另一个问题？

希望这可以帮助！