我有一个表单，我必须选择个人资料，然后是子类别，然后是产品名称，如下所示。
<div class="wrapper wrapper-content animated fadeInRight">
<div class="col-md-6 col-md-offset-2">
<h2>Create New Product</h2>
<%= form_for @product, url: {action: "create"} do |f| %>
<% @product.errors.full_messages.each do |msg| %>
<p class="alert alert-danger"><%= msg %></p>
<% end %>
<%= f.label :profiles, "Profile" %>
<%= f.collection_select(:profiles, Profile.all, :id, :name, {include_blank: '- Please Select -'}, {:class=>'form-control',:required => true, :title => 'Please Select Profile or Create a new Profile'})%>
<%= f.label :sub_categories, "Sub Category" %>
<%= f.collection_select(:sub_categories, SubCategory.all, :id, :name, {include_blank: '- Please Select -'}, {:class=>'form-control',:required => true, :title => 'Please Select Profile or Create a new Profile'})%>
<%= f.text_field :name, :class=>"form-control", :placeholder => "Product Name", :required => "true" %>
<%= f.submit "Create", :class=>"btn btn-primary" ,:title => "New Product", "data-confirm" => "Do you really want to create?"%>
<% end %>
</div>
</div>
它按如下方式发送参数
{"utf8"=>"✓",
"authenticity_token"=>"aQN2cZCOMdesKEJmZN3Ddw7woPtZTIWrgoph+LOkGoA=",
"product"=>{"profiles"=>"1",
"sub_categories"=>"3",
"name"=>"Gel"},
"commit"=>"Create"}
因此，我已在产品控制器中声明了如下强参数：
def products_params
params.require(:product).permit(:id, :name, :profiles, :sub_categories)
end
产品型号
class Product < ActiveRecord::Base
has_many :profile_products
has_many :profiles , through: :profile_products
has_many :profile_products
has_many :sub_categories , through: :profile_products
end
个人资料模型
class Profile < ActiveRecord::Base
has_many :profile_products
has_many :products , through: :profile_products
end
子类别模型
class SubCategory < ActiveRecord::Base
has_many :profile_products
has_many :profiles , through: :profile_products
has_many :profile_products
has_many :products , through: :profile_products
end
ProfileProduct模型
class ProfileProduct < ActiveRecord::Base
belongs_to :profile
belongs_to :product
belongs_to :sub_category
end
我知道错误是强参数，但我对如何处理它感到困惑。有些人可以指出我正确的方向。
错误
activemodel (4.1.8) lib/active_model/forbidden_attributes_protection.rb:21:in `sanitize_for_mass_assignment'
activerecord (4.1.8) lib/active_record/attribute_assignment.rb:24:in `assign_attributes'
activerecord (4.1.8) lib/active_record/core.rb:453:in `init_attributes'
activerecord (4.1.8) lib/active_record/core.rb:196:in `initialize'
activerecord (4.1.8) lib/active_record/inheritance.rb:30:in `new'
activerecord (4.1.8) lib/active_record/inheritance.rb:30:in `new'
cancancan (1.9.2) lib/cancan/controller_resource.rb:85:in `build_resource'
cancancan (1.9.2) lib/cancan/controller_resource.rb:66:in `load_resource_instance'
cancancan (1.9.2) lib/cancan/controller_resource.rb:32:in `load_resource'
cancancan (1.9.2) lib/cancan/controller_resource.rb:25:in `load_and_authorize_resource'
cancancan (1.9.2) lib/cancan/controller_resource.rb:10:in `block in add_before_filter'
activesupport (4.1.8) lib/active_support/callbacks.rb:440:in `instance_exec'
activesupport (4.1.8) lib/active_support/callbacks.rb:440:in `block in make_lambda'
activesupport (4.1.8) lib/active_support/callbacks.rb:160:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:160:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:229:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:229:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:229:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:229:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:86:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:86:in `run_callbacks'
actionpack (4.1.8) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (4.1.8) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.1.8) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
activesupport (4.1.8) lib/active_support/notifications.rb:159:in `block in instrument'
activesupport (4.1.8) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.1.8) lib/active_support/notifications.rb:159:in `instrument'
actionpack (4.1.8) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.1.8) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
activerecord (4.1.8) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.1.8) lib/abstract_controller/base.rb:136:in `process'
actionview (4.1.8) lib/action_view/rendering.rb:30:in `process'
actionpack (4.1.8) lib/action_controller/metal.rb:196:in `dispatch'
actionpack (4.1.8) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.1.8) lib/action_controller/metal.rb:232:in `block in action'
actionpack (4.1.8) lib/action_dispatch/routing/route_set.rb:82:in `call'
actionpack (4.1.8) lib/action_dispatch/routing/route_set.rb:82:in `dispatch'
actionpack (4.1.8) lib/action_dispatch/routing/route_set.rb:50:in `call'
actionpack (4.1.8) lib/action_dispatch/journey/router.rb:73:in `block in call'
actionpack (4.1.8) lib/action_dispatch/journey/router.rb:59:in `each'
actionpack (4.1.8) lib/action_dispatch/journey/router.rb:59:in `call'
actionpack (4.1.8) lib/action_dispatch/routing/route_set.rb:678: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 (1.5.2) lib/rack/etag.rb:23:in `call'
rack (1.5.2) lib/rack/conditionalget.rb:35:in `call'
rack (1.5.2) lib/rack/head.rb:11:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/flash.rb:254:in `call'
rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/cookies.rb:560:in `call'
activerecord (4.1.8) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.1.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in `call'
activerecord (4.1.8) lib/active_record/migration.rb:380:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.1.8) lib/active_support/callbacks.rb:82:in `run_callbacks'
actionpack (4.1.8) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/reloader.rb:73:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.1.8) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.1.8) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.1.8) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.1.8) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.1.8) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.1.8) lib/rails/rack/logger.rb:20:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
rack (1.5.2) lib/rack/runtime.rb:17:in `call'
activesupport (4.1.8) lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/static.rb:84:in `call'
rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
railties (4.1.8) lib/rails/engine.rb:514:in `call'
railties (4.1.8) lib/rails/application.rb:144:in `call'
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/arunbhat/.rvm/rubies/ruby-2.0.0-p353/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service'
/Users/arunbhat/.rvm/rubies/ruby-2.0.0-p353/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run'
/Users/arunbhat/.rvm/rubies/ruby-2.0.0-p353/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread
答案 0 :(得分：1)
#app/db/migrate/20150116071437_create_products.rb
class CreateProducts < ActiveRecord::Migration
def change
create_table :products do |t|
t.string :name
t.string :brand
t.timestamps null: false
end
end
end
#app/db/migrate/20150116071503_create_profiles.rb
class CreateProfiles < ActiveRecord::Migration
def change
create_table :profiles do |t|
t.string :name
t.timestamps null: false
end
end
end
#app/db/migrate/20150116071631_create_products_profiles.rb
class CreateProductsProfiles < ActiveRecord::Migration
def change
create_table :products_profiles, id: false do |t|
t.belongs_to :product, index: true
t.belongs_to :profile, index: true
end
end
end
#product.rb
class Product < ActiveRecord::Base
has_and_belongs_to_many :profiles
end
#profile.rb
class Profile < ActiveRecord::Base
has_and_belongs_to_many :products
end
#app/controllers/products_controller.rb
class ProductsController < ApplicationController
def new
@product = Product.new
end
def create
@product = Product.new(product_params)
#select your profile based on chosen params.
selected_profile = Profile.where(id: params["profiles"]).first
#now, assign them to the product.
@product.profiles << selected_profile
if @product.save
redirect_to products_path
else
render :new
end
end
private
def product_params
params.require(:product).permit(:name, :brand)
end
end
#app/views/products/_form.html.erb
<%= form_for(@product) do |f| %>
<div class="field">
<%= f.label :name %><br>
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :brand %><br>
<%= f.text_field :brand %>
</div>
<div class="field">
<%= label_tag :profile, 'Select a profile' %>
<%= select_tag(:profiles,
options_from_collection_for_select(Profile.all, :id, :name) ) %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
这显示了关联，模型，控制器和查看代码。（产品和配置文件关系）！类似地尝试构建产品＆lt; - ＆gt;子类别（多对多关联）
选中此doc，这会对您有所帮助：）
答案 1 :(得分：0)
我会选择嵌套属性的路径。您的表单将更改为
f.fields_for(:profiles) do |profile_form|
profile_form.collection_select(:id, Profile.all ...)
end
您的控制器将更改为params.permit(:profiles_attributes)
并且您的Product模型需要accepts_nested_attributes_for :profiles
或者，您可以在Product模型上定义一个访问者，以便在视图中捕获它并手动保存：
attr_accessor :profile_id