我有一个我一直在研究的rails应用程序，它有三个多对多的型号。基本上，该应用程序的课程可以包含许多位置和位置，可以通过courseassociations拥有许多教师。
当用户创建新课程时，我希望他们添加课程详细信息，添加新位置或现有位置，并为每个位置分配或创建新教师。
我的应用目前看起来如下;
模型
class Course < ActiveRecord::Base
has_many :courseassociations, :dependent => :destroy
has_many :courseinstructors, through: :courseassociations
has_many :courselocations, through: :courseassociations
accepts_nested_attributes_for :courselocations
accepts_nested_attributes_for :courseinstructors
end
class Courselocation < ActiveRecord::Base
has_many :courseassociations
has_many :courseinstructors, through: :courseassociations
has_many :courses, through: :courseassociations
end
class Courseinstructor < ActiveRecord::Base
has_many :courseassocaitions
has_many :courses, through: :courseassocaitions
end
控制器
class Admin::CoursesController < ApplicationController
def new
@course = Course.new
1.times {@course.courselocations.build}
1.times {@course.courseinstructors.build}
end
def course_params
params.require(:course).permit(:name, :summary, :description, :signup_link, :price, courselocations_attributes: [:id, :name, :address, :city, :state, :zipcode, :_destroy], courseinstructors_attributes: [:first_name, :last_name, :title, :company, :image, :_destroy, :id])
end
end
查看（通过课程嵌套表单）
<% if @course.new_record? %>
<%= f.fields_for :courselocations do |builder| %>
<%= render 'courselocation_fields', f: builder %>
<%= f.fields_for :courseinstructors do |builder| %>
<%= render 'courseinstructor_fields', f: builder %>
<% end %>
<% end %>
<% end %>
在我的控制器中，让courselocations_attributes: [...]和courseinstructors_attributes: [...]返回Unpermitted parameter: courseinstructors_attributes
如果我这样改变控制器; courselocations_attributes: [..., courseinstructors_attributes: [...]]这可行，但我的courseassociations表如下所示;
| id | course_id | courselocation_id | courseinstructor_id | created_at | updated_at |
+----+-----------+-------------------+---------------------+---------------------+---------------------+
| 1 | 1 | 1 | NULL | 2017-10-13 03:15:43 | 2017-10-13 03:15:43 |
| 2 | 2 | 2 | NULL | 2017-10-13 03:35:05 | 2017-10-13 03:35:05 |
| 3 | 2 | 3 | NULL | 2017-10-13 03:35:05 | 2017-10-13 03:35:05 |
| 4 | NULL | 3 | 1 | 2017-10-13 15:33:46 | 2017-10-13 03:35:05
我期待的是
| id | course_id | courselocation_id | courseinstructor_id | created_at | updated_at |
+----+-----------+-------------------+---------------------+---------------------+---------------------+
| 1 | 1 | 1 | NULL | 2017-10-13 03:15:43 | 2017-10-13 03:15:43 |
| 2 | 2 | 2 | NULL | 2017-10-13 03:35:05 | 2017-10-13 03:35:05 |
| 3 | 2 | 3 | 1 | 2017-10-13 03:35:05 | 2017-10-13 03:35:05 |
| 4 | 2 | 3 | 2 | 2017-10-13 03:35:05 | 2017-10-13 03:35:05 |
不确定我在这里做错了什么？
示例控制台输出
Started POST "/admin/courses" for ::1 at 2017-10-14 23:02:48 -0400
Processing by Admin::CoursesController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"aXe/nmTm32mBoA50eXea8b45CXheQh22fCIqcX6mzmHqJTDBD/pbTe5ZKUavyMCyJumOVJwI5KPAKb/6J2C3dQ==", "commit"=>"Save", "course"=>{"name"=>"Test IBE Course", "summary"=>"Test IBE Course", "description"=>"<p>\r\n\tTest IBE Course\r\n</p>", "price"=>"1000.00", "signup_link"=>"Test", "courselocations_attributes"=>{"0"=>{"name"=>"IBE 1", "address"=>"Some road", "city"=>"Boston", "state"=>"MA", "zipcode"=>"02135", "_destroy"=>"false", "courseinstructors_attributes"=>{"1508036554699"=>{"first_name"=>"Kyla", "last_name"=>"Slen", "title"=>"VP", "company"=>"EurekaConnect", "image"=>#<ActionDispatch::Http::UploadedFile:0x007faf7e27c0d8 @tempfile=#<Tempfile:/var/folders/87/27b7nz496w1dms5_my1z2mxm0000gn/T/RackMultipart20171014-43380-10zghle.jpg>, @original_filename="250px-PlagueOfInsecticons_Bumblebee_and_Spike_hide.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"course[courselocations_attributes][0][courseinstructors_attributes][1508036554699][image]\"; filename=\"250px-PlagueOfInsecticons_Bumblebee_and_Spike_hide.jpg\"\r\nContent-Type: image/jpeg\r\n">, "_destroy"=>"false"}}}}}}
User Load (0.3ms) SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 ORDER BY `users`.`id` ASC LIMIT 1
(0.2ms) BEGIN
(0.2ms) SELECT COUNT(*) FROM `courses` WHERE (permalink = 'test-ibe-course')
(0.2ms) SELECT COUNT(*) FROM `courselocations` WHERE (permalink = 'ibe-1-boston-ma')
Courselocation Load (23.8ms) SELECT `courselocations`.* FROM `courselocations` WHERE (permalink LIKE 'ibe-1-boston-ma%') ORDER BY id
(0.4ms) SELECT COUNT(*) FROM `courseinstructors` WHERE (permalink = 'kyla-slen')
SQL (0.3ms) INSERT INTO `courses` (`name`, `summary`, `description`, `signup_link`, `price`, `permalink`, `created_at`, `updated_at`) VALUES ('Test IBE Course', 'Test IBE Course', '<p>\r\n Test IBE Course\r\n</p>', 'Test', '1000.00', 'test-ibe-course', '2017-10-15 03:02:49', '2017-10-15 03:02:49')
SQL (0.2ms) INSERT INTO `courselocations` (`name`, `address`, `city`, `state`, `zipcode`, `permalink`, `created_at`, `updated_at`) VALUES ('IBE 1', 'Some road', 'Boston', 'MA', '02135', 'ibe-1-boston-ma-1', '2017-10-15 03:02:49', '2017-10-15 03:02:49')
SQL (0.3ms) INSERT INTO `courseinstructors` (`first_name`, `last_name`, `title`, `company`, `image`, `permalink`, `created_at`, `updated_at`) VALUES ('Kyla', 'Slen', 'VP', 'EurekaConnect', 'ibeinc/bc2uq6g1ttzeycbge0gc.jpg', 'kyla-slen', '2017-10-15 03:02:49', '2017-10-15 03:02:49')
SQL (0.5ms) UPDATE `courseinstructors` SET `courseinstructors`.`image` = 'image/upload/v1508036568/ibeinc/bc2uq6g1ttzeycbge0gc.jpg' WHERE `courseinstructors`.`id` = 2
SQL (0.3ms) UPDATE `courselocations` SET `name` = 'IBE 1', `address` = 'Some road', `city` = 'Boston', `state` = 'MA', `zipcode` = '02135', `permalink` = 'ibe-1-boston-ma-1', `created_at` = '2017-10-15 03:02:49', `updated_at` = '2017-10-15 03:02:49', `id` = 8 WHERE `courselocations`.`id` = 8
SQL (0.2ms) INSERT INTO `courseassociations` (`courselocation_id`, `courseinstructor_id`, `created_at`, `updated_at`) VALUES (8, 2, '2017-10-15 03:02:50', '2017-10-15 03:02:50')
SQL (0.2ms) UPDATE `courses` SET `name` = 'Test IBE Course', `summary` = 'Test IBE Course', `description` = '<p>\r\n Test IBE Course\r\n</p>', `signup_link` = 'Test', `price` = '1000.00', `permalink` = 'test-ibe-course', `created_at` = '2017-10-15 03:02:49', `updated_at` = '2017-10-15 03:02:49', `id` = 7 WHERE `courses`.`id` = 7
SQL (0.1ms) INSERT INTO `courseassociations` (`course_id`, `courselocation_id`, `created_at`, `updated_at`) VALUES (7, 8, '2017-10-15 03:02:50', '2017-10-15 03:02:50')
(6.9ms) COMMIT