nested_attributes与simple_field_for获取未经许可的参数错误轨道

Question

我有机型

class Profile < ActiveRecord::Base 
    belongs_to :user 
    has_many :user_interests 
    has_many :interests, :through => :user_interests 
    accepts_nested_attributes_for :user_interests 
end 

class UserInterest < ActiveRecord::Base 
    belongs_to :profile 
    belongs_to :interest 
end 

class Interest < ActiveRecord::Base 
    has_many :user_interests 
    has_many :profiles, :through => :user_interests 
end 

controller

private 
    def profile_params 
     params.require(:profile).permit(:first_name, :last_name, :date_of_birth, user_interests_attributes: {:interest => []}) 
    end 

视图

=#"http://stackoverflow.com/questions/18428871/multi-column-forms-with-fieldsets" 
= simple_form_for(@profile, html: {class: 'form-horizontal'}) do |f| 
    .well.well-lg 
    %fieldset 
     %legend Personal Information 
     .row 
     .col-sm-4 
      .form-group 
      = f.input :first_name, label: 'First Name*' 
      = f.hint 'No special characters, please!' 
     .col-sm-4 
      .form-group 
      = f.input :last_name, label: 'First Name*' 
      = f.hint 'No special characters, please!' 
     .row 
     .col-sm-4 
      .form-group 
      = f.input :date_of_birth, as: :string, 'data-behaviour'=>'datepicker' 
     %legend Other Information 
     .row 
     .col-sm-4 
      .form-group 
      = f.simple_fields_for :user_interests, UserInterest.new do |s| 
       = s.collection_select(:interest, Interest.all, :id, :name,{},{:multiple=>true}) 
      = f.hint 'Please use Ctrl key on your keyboard to select multiple items' 
     .row 
     = f.submit 

但得到错误不允许的参数

profile_params

未经许可的参数：兴趣

=> { “first_name的”=> “”， “姓氏”=> “”， “DATE_OF_BIRTH”=> “”， “user_interests_attributes”=> {” 0 “=> {}}}

在我的PARAMS是：

PARAMS => {” UTF8 “=>” ✓ “ ”_method“=> ”补丁“，” authenticity_token “=>” 7/7sKljbi88cmUOen/WFWzhzV6exE8I8fBnNMA5EEL “=”， “profile”=> {“first_name”=>“”，“last_name”=>“”，
“date_of_birth”=>“”，
“user_interests_attributes”=> {“0”=> {“interest”=>“test”}}}， “commit”=>“Update Profile”，“action”=>“update”， “controller”=>“profiles”，“id”=>“1 “}

请纠正我在哪里，我错了

Answer 1

你忘了对使用者兴趣增加accepts_nested_attributes_for :interest。

class Profile < ActiveRecord::Base 
    belongs_to :user 
    has_many :user_interests 
    has_many :interests, :through => :user_interests 
    accepts_nested_attributes_for :user_interests 
end 

class UserInterest < ActiveRecord::Base 
    belongs_to :profile 
    belongs_to :interest 
    accepts_nested_attributes_for :interest 
end 

class Interest < ActiveRecord::Base 
    has_many :user_interests 
    has_many :profiles, :through => :user_interests 
end 

您可能必须将兴趣定义为控制器中strong_parameters定义的有效参数。