Rails - 具有复杂参数的嵌套形式

Question

I need to create a campaign with given prizes. My models already are related and accepting nested attributes.

View:

      <%= form_for @campaign, remote: true do |f| %>
       <% 5.times do |i| %>
        <%= f.fields_for :prizes do |prize_form| %>
          <div class="form-group">
            <%= prize_form.label "prize #{i + 1}" %>
            <%= prize_form.text_field :name %>
          </div>
        <% end %>
      <% end %>
     <% end %>

Which generates:

<input id="campaign_prizes_attributes_0_name" name="campaign[prizes_attributes][0][name]" type="text">
<input id="campaign_prizes_attributes_1_name" name="campaign[prizes_attributes][1][name]" type="text">
<input id="campaign_prizes_attributes_2_name" name="campaign[prizes_attributes][2][name]" type="text">
<input id="campaign_prizes_attributes_3_name" name="campaign[prizes_attributes][3][name]" type="text">
<input id="campaign_prizes_attributes_4_name" name="campaign[prizes_attributes][4][name]" type="text">

In my controller I have this

class CampaignsController < ApplicationController

  respond_to :html, :js
    def index
        @campaigns = Campaign.all
    end

    def new
        @campaign = Campaign.new
        @campaign.prizes.build
    end

    def create
        @campaign = Campaign.new(campaign_params)
        @campaign.prizes.build
    end

    def campaign_params
        params.require(:campaign).permit(:name, :date_start, :date_end, :status, :rules, prizes_attributes: [name: []])
    end
end

No matter what I do, I always get this error:

Unpermitted parameters: name

I need to make each campaign have a varying ammount of prizes, but I'm not able to make this work. What am I doing wrong?

Thanks.

Answer 1

The campaign_params method should be:

 def campaign_params
      params.require(:campaign).permit(:name, 
                                                                      :date_start,
                                                                      :date_end, 
                                                                      :status,
                                                                      :rules,
                                                                      prizes_attributes: [ :name ])
 end

How permit nested attributes

Answer 2

Your campaign_params are wrong

prizes_attributes: [name: []]

must be

prizes_attributes: [:name]