gistfile1.txt

<%= form_tag multi_save_item_path do %>
  <% age_list = (18..30).to_a %>
  <ol>
    <li class="template">
    name<input data-name="ic[name][]"> , 
    age<select data-name="ic[age][]"><%= options_for_select(age_list) %></select>
    <span class="add">add</span><span class="del">del</span></li>
    <% @item_childs.each do |old_ic| %>
      <li class="old_record">
        name<%= text_field_tag "ic_old[#{old_ic.id}][name]" , old_ic.name %> , 
        age<%= select_tag "ic_old[#{old_ic.id}][age]" , options_for_select(age_list , old_ic.age) %></select>
        
        <%= select_tag "profile[profile_option_attributes][][option_id]", options_from_collection_for_select(issue.option, "id" ,"content"), {:class =>"form-control"} %>
        
        <span class="add">add</span>
        <span class="del">del</span> 
        (<%= old_ic.id %>)
      </li>
    <% end %>
  </ol>
  <button type="submit">Submit</button>
<% end %>

gistfile2.txt

member do
      post :profile_option_save
end

new.html.erb

<div class='content_wrapper option_wrapper'> 
	<ul class = 'option_first_banner clearfix'>
		<li class = 'option_right_banner'>
			<%= form_for @profile, :url => dashboard_user_profiles_path, :method => :POST do |f| %>
				<div class="edit_panel panel panel-default">
					<div class="edit_heading panel-heading">
						<h3 class="panel-title">個人資料</h3>
					</div>
					<div class="panel-body">
						<div class='option_content'>
					    	<div class="form-group">
					      		<%= label_tag "地點：" %> <%= f.text_field :location, class:"form-control" %>
					    	</div>
					    	<div class="form-group">
								<%= label_tag "性別：" %> <%= f.select :gender, Profile::GENDER_TYPES, class:"form-control" %>
							</div>
							<% @issues.each do |issue|%>
							<div class="form-group">
								<%= issue.content %>	
								<%= select_tag "profile[profile_option_attributes][][option_id]", options_from_collection_for_select(issue.option, "id" ,"content"), {:class =>"form-control"} %>
								
							</div>
							<% end %>
						</div>
						<div class="form-group">
							<%= f.submit "送出", class: "btn btn-primary" %>
						</div>
				  	</div>
				</div>
			<% end %>
		</li>
	</ul>
</div>

profile_controller.rb

class  Dashboard::ProfilesController < Dashboard::DashboardController 
  before_action :find_user
  before_action :set_profile
  
  
  
  def new
     @profile = @user.build_profile
     #id:4是登入類別
     @issues = SpecialCate.find(4).issue
     #@profile_option = ProfileOption.new(:profile_id => current_user)
     @profile_option = @profile.profile_option.new(:profile_id => current_user)
  end
  
  def edit
    
  end
  
  def create
    #User.create(:name => params[:user][:name])
    #@profile = @user.build_profile(:location=>params[:profile][:location], :gender=>params[:profile][:gender], :profile_option => params[:profile][:profile_option][:option_id])
    @profile = @user.build_profile(profile_params)
    if @profile.save
      #redirect_to  dashboard_user_path(current_user)
      redirect_to special_cates_dashboard_user_responds_path(current_user)
    else 
      render new
    end
  end
  
  def update
    @profile = @user.profile
    if @profile.update(profile_params)
         redirect_to  dashboard_user_path(current_user)
    else
        render edit
    end
        
    end
  
  private
  def profile_params
    #測試用
    #params.require(:profile).permit(:location, :gender, :option_ids =>[])
    #測試用
   
    #可以用的
    params.require(:profile).permit(:location, :gender, profile_option_attributes:[:option_id])
    #可以用的
    
    #params.require(:profile).permit(:location, :gender, :option_ids => [])
    #params.require(:profile).permit(:location, :gender, :option_ids => [], :basic_option_a, :basic_option_b, :basic_option_c, :basic_option_d, :basic_option_e)

  end
  
  def find_user
    @user = current_user
  end
  
  def set_profile
    @profile = @user.profile
  end
  
end

test profile_controller.rb

class  Dashboard::ProfilesController < Dashboard::DashboardController 
  before_action :find_user
  before_action :set_profile
  
  
  
  def new
     @profile = @user.build_profile
     #id:4是登入類別
     @issues = SpecialCate.find(4).issue
     #@profile_option = ProfileOption.new(:profile_id => current_user)
     @profile_option = @profile.profile_option.new(:profile_id => current_user)
  end
  
  def edit
    
  end
  
  def create
    
    @profile = @user.build_profile(params[:profile][:location], params[:profile][:location])
    params[profile_option_attributes][][option_id].each_index do |index|
      ProfileOption.create(:profile_id => @profile.id , :option_id => params[profile_option_attributes][][option_id][index])
    end
    if @profile.save
      #redirect_to  dashboard_user_path(current_user)
      redirect_to special_cates_dashboard_user_responds_path(current_user)
    else 
      render new
    end
  end
  
  def update
    @profile = @user.profile
    if @profile.update(profile_params)
         redirect_to  dashboard_user_path(current_user)
    else
        render edit
    end
  -----
    #取出所有關連id
    ids = (params[:ic_old] || {}).keys.map{|i|i.to_i}

    #語意：排除送出的id之外的所有隸屬item的都刪除
    ItemChild.where("item_id = #{@item.id} AND id NOT IN (#{ids.join(',')})").delete_all

    #更新舊的資料
    if params[:ic_old]
      params[:ic_old].each_pair do |id , data|
        ic = ItemChild.where(:item_id => @item.id , :id => id).first
        if ic
          #這邊要過 permit 或是一個一個指定都行
          ic.update_attributes(:name => data[:name] , :age => data[:age])
        end
      end
    end

    #額外新增的都再塞入
    if params[:ic]
      params[:ic][:name].each_index do |index|
        ItemChild.create(:item_id => @item.id , :name => params[:ic][:name][index] , :age => params[:ic][:age][index])
      end
    end
    redirect_to :back
  end
  end
  
  private
  def profile_params
    #測試用
    #params.require(:profile).permit(:location, :gender, :option_ids =>[])
    #測試用
   
    #可以用的
    params.require(:profile).permit(:location, :gender, profile_option_attributes:[:option_id])
    #可以用的
    
    #params.require(:profile).permit(:location, :gender, :option_ids => [])
    #params.require(:profile).permit(:location, :gender, :option_ids => [], :basic_option_a, :basic_option_b, :basic_option_c, :basic_option_d, :basic_option_e)

  end
  
  def find_user
    @user = current_user
  end
  
  def set_profile
    @profile = @user.profile
  end
  
end