使用has_many複選框創建的重複連接表記錄無法取消選擇/銷燬它們

Question

我正在關注使用複選框使用複選框創建關聯記錄的HABTM Railscast＃17的。

我終於得到了我的記錄保存到連接表....但我無法通過檢查或取消選中一個框來控制它們....意味着取消選中該記錄不會執行任何操作並將選中的記錄保留爲另一個記錄。

我有3張桌子。

:project has_many :restrictions, :through => :project_restrictions 

我想什麼，能夠做的是，我可以檢查創建複選框的數組：project_restrictions。 ..或，如果我取消選中它們，則刪除：project_restriction記錄。

現在它只是保存多個記錄，不刪除它們，如果我取消選中它們。

我已經把我所有的邏輯在ProjectsController和正在運行的方法添加：通過自定義PATCH方法project_restrictions稱爲「add_restrictions」。這應該是一個POST嗎？我無法通過添加關聯記錄或僅發佈關聯記錄來確定我是否在PATCHING Project中。

我的連接表有一個：ID沒有：時間戳 ....我不知道這是否事項....很明顯，我是新的。

我使用的鐵軌4

我的模型

class Project < ActiveRecord::Base 

    has_many :project_restrictions, dependent: :destroy 
    has_many :restrictions, :through => :project_restrictions 

    accepts_nested_attributes_for :project_restrictions, allow_destroy: true, :reject_if => :all_blank 


class Restriction < ActiveRecord::Base 

    has_many :projects, :through => :project_restrictions 
    has_many :project_restrictions, dependent: :destroy 

class ProjectRestriction< ActiveRecord::Base 

    belongs_to :restriction 
    belongs_to :project 
end 

**我PATCH控制器的方法創建相關的記錄**

def add_restrictions 
    @diet = Restriction.k1.order(:name) 
    @project = Project.find(params[:p]) 

    params[:project][:restriction_ids].reject!(&:empty?).each do |restriction| 

    @proj_rule = ProjectRestriction.create!(:project_id => @project.id, :restriction_id => restriction) 
    @proj_rule.save 

    end 
    respond_to do |format| 

format.html { redirect_to t1s3_path(:p => @project.id) , 
notice: 'Success! You added restrictions!' } 
format.json {} 

end 
end 

我的形式

<%= form_for @project, url: add_restrictions_path(:p => @project.id) do |f| %> 

    <div class=" fields "> 
     <%= hidden_field_tag "project[restriction_ids][]", nil %> 
      <% @diet.each do |restriction| %> 

       <%= check_box_tag "project[restriction_ids][]", restriction.id,   
      @project.restriction_ids.include?(restriction.id), id: dom_id(restriction)%> 
      <%= label_tag dom_id(restriction), restriction.name %><br> 

      <% end %> 

     </div> 
    <%= f.submit %> 

UPDATE：

我已經更新我的模型有「uniq的和inverse_of ....但是我仍然創造重複的記錄，無法通過取消選中該複選框

class Project < ActiveRecord::Base 

    has_many :project_restrictions -> { uniq }, dependent: :destroy, inverse_of: :project 
    has_many :restrictions, -> { uniq }, through: :project_restrictions 

    accepts_nested_attributes_for :project_restrictions, allow_destroy: true, :reject_if => :all_blank 


class Restriction < ActiveRecord::Base 

    has_many :projects, -> { uniq }, through: :project_restrictions 
    has_many :project_restrictions, -> { uniq }, dependent: :destroy, inverse_of: :restriction 

class ProjectRestriction< ActiveRecord::Base 

    belongs_to :restriction, -> { uniq }, inverse_of: :project_restrictions 
    belongs_to :project, -> { uniq }, inverse_of: :project_restrictions 
end 

Answer 1

消滅他們

在add_restrictions改變這種方法，並嘗試

def add_restrictions 
    @diet = Restriction.k1.order(:name) 
    @project = Project.find(params[:p]) 

    params[:project][:restriction_ids].reject!(&:empty?).each do |restriction| 
     @projectrestrictions = ProjectRestriction.all 
     @projectrestrictions.each do |prj| 
     if prj.restriction_id == restriction 
      ProjectRestriction.destroy_all(prj.id) 
     else 
      @proj_rule = ProjectRestriction.create!(:project_id => @project.id, :restriction_id => restriction) 
      @proj_rule.save 
     end 
     end 
    respond_to do |format| 

format.html { redirect_to t1s3_path(:p => @project.id) , 
notice: 'Success! You added restrictions!' } 
format.json {} 

end 
end