我是从嵌套模型中构建复选框，但不知怎的，我已经遇到了这个问题，它已经使用类似的形式工作得很好但是它被困在这里，从什么我可以假设它是以某种方式将我的模型主键转换为整数，而我使用Mongoid并且我的对象键是字符串，这里是详细信息，这方面的任何帮助/建议都非常受欢迎，我会马上接受答案。
错误：
Showing _form.html.erb where line #31 raised:
undefined method `to_i' for #<TrainerRate:0x007fd61d9d7470>
to.check_box行出现错误。 查看代码：
<%= f.fields_for :booking_details do |to| %>
<% ScheduleSlot.all.each do |tr| %>
<tr>
<td><%= tr.hour_from %></td>
<td>$<%= @user.peak_rate %>/Hour</td>
<% ScheduleSlotDay.all.each do |scd| %>
<% ob = @trainer_rates.where(:schedule_slot_day=>scd._id,:schedule_slot=>tr._id).first %>
<td> <label> <%= to.check_box :trainer_rate %>$<%= ob.rate %>/hr</label></td>
<% end
%>
</tr>
<% end %>
在控制器中，如果我将trainer_rate：f._id更改为1，它可以很好地调出复选框，但它们不是我真正需要的，它们自然没有正确的ID，所以问题就在某处那里。
控制器代码（仅限相关操作）：
def new
@booking = Booking.new
@user = User.find(params[:user])
@consumer = User.new
@trainer_rates = TrainerRate.where({user:@user._id}).all
@trainer_rates.each do |f|
@booking.booking_details.build trainer_rate:f._id
end
@booking.build_consumer
端
预订模式（仅限相关部分）：
accepts_nested_attributes_for :booking_details
def booking_details_attributes=(details_attributes)
details_attributes.each do |attributes|
booking_details.build(attributes)
end
end
预订明细模型（相关部分）：
belongs_to :booking
belongs_to :trainer_rate
TrainerRate模式（如评论中所示）：
class TrainerRate
include Mongoid::Document
field :rate, type: Float
belongs_to :schedule_slot_day
belongs_to :user
belongs_to :schedule_slot
has_many :booking_details
end
完成堆栈跟踪：
/Users/mohammadusman/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-5b0f031992cb/lib/mongoid/relations/proxy.rb:150:in `method_missing'
actionpack (4.0.0) lib/action_view/helpers/tags/check_box.rb:53:in `checked?'
actionpack (4.0.0) lib/action_view/helpers/tags/checkable.rb:10:in `input_checked?'
actionpack (4.0.0) lib/action_view/helpers/tags/check_box.rb:19:in `render'
actionpack (4.0.0) lib/action_view/helpers/form_helper.rb:930:in `check_box'
actionpack (4.0.0) lib/action_view/helpers/form_helper.rb:1649:in `check_box'
/Users/mohammadusman/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-5b0f031992cb/lib/mongoid/contextual/mongo.rb:648:in `yield_document'
/Users/mohammadusman/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-5b0f031992cb/lib/mongoid/contextual/mongo.rb:123:in `block in each'
moped (2.0.0.beta6) lib/moped/cursor.rb:28:in `block in each'
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moped (2.0.0.beta6) lib/moped/query.rb:77:in `each'
/Users/mohammadusman/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-5b0f031992cb/lib/mongoid/contextual/mongo.rb:122:in `each'
/Users/mohammadusman/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-5b0f031992cb/lib/mongoid/contextual.rb:20:in `each'
/Users/mohammadusman/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-5b0f031992cb/lib/mongoid/contextual/mongo.rb:648:in `yield_document'
/Users/mohammadusman/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-5b0f031992cb/lib/mongoid/contextual/mongo.rb:123:in `block in each'
moped (2.0.0.beta6) lib/moped/cursor.rb:28:in `block in each'
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moped (2.0.0.beta6) lib/moped/cursor.rb:28:in `each'
moped (2.0.0.beta6) lib/moped/query.rb:77:in `each'
/Users/mohammadusman/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-5b0f031992cb/lib/mongoid/contextual/mongo.rb:122:in `each'
/Users/mohammadusman/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-5b0f031992cb/lib/mongoid/contextual.rb:20:in `each'
actionpack (4.0.0) lib/action_view/helpers/capture_helper.rb:38:in `block in capture'
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actionpack (4.0.0) lib/action_view/helpers/capture_helper.rb:38:in `capture'
actionpack (4.0.0) lib/action_view/helpers/form_helper.rb:1864:in `block in fields_for_nested_model'
actionpack (4.0.0) lib/action_view/helpers/capture_helper.rb:38:in `block in capture'
actionpack (4.0.0) lib/action_view/helpers/capture_helper.rb:200:in `with_output_buffer'
actionpack (4.0.0) lib/action_view/helpers/capture_helper.rb:38:in `capture'
actionpack (4.0.0) lib/action_view/helpers/form_helper.rb:699:in `fields_for'
actionpack (4.0.0) lib/action_view/helpers/form_helper.rb:1863:in `fields_for_nested_model'
actionpack (4.0.0) lib/action_view/helpers/form_helper.rb:1849:in `block in fields_for_with_nested_attributes'
/Users/mohammadusman/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-5b0f031992cb/lib/mongoid/relations/referenced/many.rb:165:in `block in each'
/Users/mohammadusman/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-5b0f031992cb/lib/mongoid/relations/targets/enumerable.rb:188:in `block in each'
/Users/mohammadusman/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-5b0f031992cb/lib/mongoid/relations/targets/enumerable.rb:187:in `each_pair'
/Users/mohammadusman/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-5b0f031992cb/lib/mongoid/relations/targets/enumerable.rb:187:in `each'
/Users/mohammadusman/.rvm/gems/ruby-2.0.0-p247/bundler/gems/mongoid-5b0f031992cb/lib/mongoid/relations/referenced/many.rb:165:in `each'
actionpack (4.0.0) lib/action_view/helpers/form_helper.rb:1847:in `fields_for_with_nested_attributes'
actionpack (4.0.0) lib/action_view/helpers/form_helper.rb:1521:in `fields_for'
actionpack (4.0.0) lib/action_view/helpers/capture_helper.rb:38:in `block in capture'
actionpack (4.0.0) lib/action_view/helpers/capture_helper.rb:200:in `with_output_buffer'
actionpack (4.0.0) lib/action_view/helpers/capture_helper.rb:38:in `capture'
actionpack (4.0.0) lib/action_view/helpers/form_helper.rb:435:in `form_for'
actionpack (4.0.0) lib/action_view/template.rb:143:in `block in render'
activesupport (4.0.0) lib/active_support/notifications.rb:161:in `instrument'
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actionpack (4.0.0) lib/action_view/renderer/partial_renderer.rb:306:in `render_partial'
actionpack (4.0.0) lib/action_view/renderer/partial_renderer.rb:279:in `block in render'
actionpack (4.0.0) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
activesupport (4.0.0) lib/active_support/notifications.rb:159:in `block in instrument'
activesupport (4.0.0) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
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actionpack (4.0.0) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
activesupport (4.0.0) lib/active_support/notifications.rb:159:in `block in instrument'
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activesupport (4.0.0) lib/active_support/notifications.rb:159:in `instrument'
actionpack (4.0.0) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
actionpack (4.0.0) lib/action_view/renderer/template_renderer.rb:48:in `block in render_template'
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actionpack (4.0.0) lib/action_view/renderer/template_renderer.rb:17:in `render'
actionpack (4.0.0) lib/action_view/renderer/renderer.rb:42:in `render_template'
actionpack (4.0.0) lib/action_view/renderer/renderer.rb:23:in `render'
actionpack (4.0.0) lib/abstract_controller/rendering.rb:127:in `_render_template'
actionpack (4.0.0) lib/action_controller/metal/streaming.rb:219:in `_render_template'
actionpack (4.0.0) lib/abstract_controller/rendering.rb:120:in `render_to_body'
actionpack (4.0.0) lib/action_controller/metal/rendering.rb:33:in `render_to_body'
actionpack (4.0.0) lib/action_controller/metal/renderers.rb:26:in `render_to_body'
actionpack (4.0.0) lib/abstract_controller/rendering.rb:97:in `render'
actionpack (4.0.0) lib/action_controller/metal/rendering.rb:16:in `render'
actionpack (4.0.0) lib/action_controller/metal/instrumentation.rb:41:in `block (2 levels) in render'
activesupport (4.0.0) lib/active_support/core_ext/benchmark.rb:12:in `block in ms'
/Users/mohammadusman/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/benchmark.rb:296:in `realtime'
activesupport (4.0.0) lib/active_support/core_ext/benchmark.rb:12:in `ms'
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activesupport (4.0.0) lib/active_support/notifications.rb:159:in `block in instrument'
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actionpack (4.0.0) lib/action_dispatch/middleware/cookies.rb:486:in `call'
actionpack (4.0.0) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
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rack (1.5.2) lib/rack/lock.rb:17:in `call'
rack (1.5.2) lib/rack/content_length.rb:14:in `call'
rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service'
/Users/mohammadusman/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service'
/Users/mohammadusman/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run'
/Users/mohammadusman/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread'
答案 0 :(得分：1)
最后制定了解决方案，我将对象链接到复选框，而不是使用它：
<%= check_box_tag 'booking[booking_details_attributes][][trainer_rate]',ob._id %>
而不是
<%= to.check_box :trainer_rate %>
希望这可以帮助面临类似问题的其他用户。 ：）