accepts_nested_attributes_forで同時にモデルを保存したいのですが、Unpermitted parameter:エラーになります

Question

下記のようなテーブルの紐付けをしており、一つの登録フォームから入力した値をそれぞのテーブルで保存できるようにしましたが、子テーブルの保存ができません。ご教授いただけますでしょうか。

birdテーブル

• id
• name
• breed
• sex
• ...

bird_conditionテーブル

• id
• ave_weight
• body_shape
• ...

(bigint "bird_id")

---

環境
Rails 6.0.0

---

#app/models/bird.rb
class Bird < ApplicationRecord
    has_many :bird_conditions, dependent: :destroy
    accepts_nested_attributes_for :bird_conditions, allow_destroy: true :reject_bird_condition
end

#app/models/bird_condition.rb
    belongs_to :bird, optional: true
end

#app/controllers/birds_controller.rb
class BirdsController < ApplicationController
  before_action :set_bird,only: [:edit, :update, :destroy]
  before_action :authenticate_user!
  before_action :correct_user,only: [:edit, :destroy]

  def index
    @birds = current_user.birds.order(created_at: :desc)
  end

  def new
    @bird = Bird.new
    @bird.bird_conditions.build
  end

  def edit
  end

  def update
    @bird.update!(bird_params)
    redirect_to birds_path,notice: "更新しました"
  end

  def create
    @bird = current_user.birds.new(bird_params)
    if @bird.save
        logger.debug "bird: #{@bird.attributes.inspect}"
        redirect_to birds_path, notice: "保存しました"
    else
        render :new
    end
  end

  def destroy
    @bird.destroy
    redirect_to birds_path,notice: "削除しました"
  end

  private

    def set_bird
      @bird = current_user.birds.find(params[:id])
    end

    def correct_user
      @bird = current_user.birds.find_by(id: params[:id])
      redirect_to birds_path if @bird.nil?
    end

    def bird_params
        params
        .require(:bird)
        .permit(
          :name,
          :breed_id,
          :sex,
          :birthday,
          :personality,
          :appeareance,
          :srarus_flg,
          :lost_day,
          :lost_place,
          :day_of_death,
          :image,
          bird_conditions_attributes:[
            :id,
            :ave_weight,
            :body_shape,
            :hospital,
            :medical_history,
            :medication,
            :insurance,
            :estrous_behavior,
            :estrous_personality,
            :bird_id
          ]
        )
    end
end

#app/views/birds/_form.html.erb
<div class="container">
    <%= form_with model: bird, local: true do |f| %>
            <table class="table-bordered">
                <div class="form-group">
                    <tr>
                        <th><%= f.label :name %></th>
                        <td><%= f.text_field :name %></td>
                    </tr>
                    <tr>
                        <th><%= f.label :breed %></th>
                        <td><%= f.collection_select :breed_id, Breed.all, :id, :name, include_brank: '選択して下さい' %></td>
                    </tr>
〜〜〜〜〜〜〜〜〜〜〜〜〜〜〜省略〜〜〜〜〜〜〜〜〜〜〜〜〜〜〜〜〜〜
                        <%= f.fields_for :bird_condition do |condition| %> 
                            <%= render partial: 'form_condition', locals:{condition: condition}%>
                        <% end %>
                </div><!-- .form-group -->
            </table><br>
                <%= f.submit nil, class: 'btn btn-primary'%>
    <% end %>
</div><!-- .container -->

#app/views/birds/_form_condition.html.erb
                <div class="form-group">
                        <tr>
                            <th><%= condition.label :ave_weight %></th>
                            <td><%= condition.number_field :ave_weight %></td>
                        </tr>
                        <tr>
                            <th><%= condition.label :body_shape %></th>
                            <td>
                            <%= condition.radio_button :body_shape, :medium %>
                            <%= condition.label :body_shape, :普通%>
                            <%= condition.radio_button :body_shape, :slim%>
                            <%= condition.label :body_shape, :痩せぎみ%>
                            <%= condition.radio_button :body_shape, :bony%>
                            <%= condition.label :body_shape, :痩せ%>
                            <%= condition.radio_button :body_shape, :chubby%>
                            <%= condition.label :body_shape, :太りぎみ%>
                            <%= condition.radio_button :body_shape, :fat%>
                            <%= condition.label :body_shape, :肥満%>
                            </td>
                        </tr>
                        <tr>
                            <th><%= condition.label :hospital %></th>
                            <td><%= condition.text_field :hospital %></td>
                        </tr>
                        <tr>
                            <th><%= condition.label :medical_history %></th>
                            <td><%= condition.text_field :medical_history %></td>
                        </tr>
                        <tr>
                            <th><%= condition.label :medication %></th>
                            <td><%= condition.text_field :medication %></td>
                        </tr>
                        <tr>
                            <th><%= condition.label :insurance %></th>
                            <td><%= condition.text_field :insurance %></td>
                        </tr>
                        <tr>
                            <th><%= condition.label :estrous_behavior %></th>
                            <td><%= condition.text_field :estrous_behavior %></td>
                        </tr>
                        <tr>
                            <th><%= condition.label :estrous_personality %></th>
                            <td><%= condition.text_field :estrous_personality %></td>
                        </tr>
                </div><!-- .form-group -->

#エラーメッセージ（ログ）
Unpermitted parameter: :bird_condition

Answer 1

_form.html.erb
<%= f.fields_for :bird_condition do |condition| %>を
<%= f.fields_for :bird_conditions do |condition| %>に変えたら保存できました