ユーザー登録でのエラーの解決をしたい

解決したいこと

deviseでのユーザー登録をしたい。

起こっている問題

NoMethodError in Devise::RegistrationsController#create
undefined method `collation' for nil:NilClass
ユーザー登録入力後、submitボタンクリックでエラーが出る。
deviseでのデフォルトのフォームの他、誕生日と都道府県の選択フォームを加えています。
https://i.gyazo.com/084aeae35356fe88f15739a02bbd6301.png

application_controller.rb

ruby
1class ApplicationController < ActionController::Base
2  protect_from_forgery with: :exception
3  before_action :authenticate_user!
4  before_action :configure_permitted_parameters, if: :devise_controller?
5
6  protected
7  def configure_permitted_parameters
8    devise_parameter_sanitizer.permit(:sign_up, keys: [:nickname, :email, :password, :birthday, :prefecture_id])
9  end
10
11end

models/user.rb

ruby
1class User < ApplicationRecord
2  extend ActiveHash::Associations::ActiveRecordExtensions
3  # Include default devise modules. Others available are:
4  # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
5  devise :database_authenticatable, :registerable,
6         :recoverable, :rememberable, :validatable
7  validates :nickname, :email, presence: true, uniqueness: true
8  validates :password, :birthday, :prefecture_id, presence: true, uniqueness: true
9
10  has_many :posts, dependent: :destroy
11  has_many :comments, dependent: :destroy
12  belongs_to_active_hash :prefecture
13end

views/devise/registrations/new.html.erb

ruby
1<%= render 'templates/form_header' %>
2
3<div class="wrapper">
4  <div class="form_container">
5    <div class="form_container__head">
6      <h2>アカウント登録</h2>
7    </div>
8    <div class="form_container__form">
9      <%= form_for(resource, as: resource_name, url: registration_path(resource_name)) do |f| %>
10        <%= render "devise/shared/error_messages", resource: resource %>
11
12        <div class="new_user__image_box">
13          <div class="new_thumbnail">
14            <%= f.label :image, class: "new_thumbnail__input_image" do %>
15              <i class="far fa-image"></i>
16              <%= f.file_field :image, class: "new_thumbnail__input_image__file" %>
17            <% end %>
18          </div>
19        </div>
20        <div class="new_user__input_box">
21          <div class="field">
22            <%= f.label :nickname, "ニックネーム" %><br />
23            <%= f.text_field :nickname, autofocus: true, class: "input-default required", placeholder: '例)バイクマン', required: true %>
24          </div>
25
26          <div class="field">
27            <%= f.label :email, "Eメール" %><br />
28            <%= f.email_field :email, autofocus: true, autocomplete: "email", class: "input-default required", placeholder: 'PC・携帯どちらでも可', required: true %>
29          </div>
30
31          <div class="field">
32            <%= f.label :password, "パスワード" %><br />
33            <%= f.password_field :password, autocomplete: "new-password", class: "input-default required", placeholder: '7文字以上の半角英数字', required: true %>
34          </div>
35
36          <div class="field">
37            <%= f.label :password_confirmation, "パスワード（確認用）" %><br />
38            <%= f.password_field :password_confirmation, autocomplete: "new-password", class: "input-default required", placeholder: 'もう一度入力してください', required: true %>
39          </div>
40
41          <div class="field">
42            <%= f.label :birthday, "生年月日" %><br />
43            <div class="field-birthday_select", id="date">
44              <%= raw sprintf(f.date_select(:birthday,{ start_year: Date.today.year, end_year: Date.today.year-120,prompt:"--", use_month_numbers: true, with_css_classes: true,discard_minute:true,date_separator: '%s', datetime_separator: '%s', id: "date" }, {required: true}), '<div class="input-field-multiple__separate-text">年</div>', '<div class="input-field-multiple__separate-text">月</div>') +'<div class="input-field-multiple__separate-text">日</div>' %>
45            </div>
46          </div>
47
48          <div class="field">
49            <%= f.label :prefecture, "都道府県" %><br />
50            <%= f.collection_select :prefecture_id, Prefecture.all, :id, :name, {autofocus: true, include_blank: "選択してください"}, {class: 'select-default', id: 'address_prefecture_name', required: true} %>
51          </div>
52
53          <div class="actions">
54            <%= f.submit "登録する" %>
55          </div>
56        </div>
57      <% end %>
58    </div>
59  </div>
60</div>
61
62<%= render 'templates/footer' %>

migrate/****_devise_create_users.rb

ruby
1# frozen_string_literal: true
2
3class DeviseCreateUsers < ActiveRecord::Migration[5.2]
4  def change
5    create_table :users do |t|
6      ## Database authenticatable
7      t.string  :nickname,           null: false, unique: true
8      t.string  :email,              null: false, default: ""
9      t.string  :encrypted_password, null: false, default: ""
10      t.date    :birthday,           null: false
11      t.integer :prefecture_id,      null: false
12      t.string  :bike_name
13      t.string  :avatar_image
14      t.string  :bike_image
15
16      ## Recoverable
17      t.string   :reset_password_token
18      t.datetime :reset_password_sent_at
19
20      ## Rememberable
21      t.datetime :remember_created_at
22
23      ## Trackable
24      # t.integer  :sign_in_count, default: 0, null: false
25      # t.datetime :current_sign_in_at
26      # t.datetime :last_sign_in_at
27      # t.string   :current_sign_in_ip
28      # t.string   :last_sign_in_ip
29
30      ## Confirmable
31      # t.string   :confirmation_token
32      # t.datetime :confirmed_at
33      # t.datetime :confirmation_sent_at
34      # t.string   :unconfirmed_email # Only if using reconfirmable
35
36      ## Lockable
37      # t.integer  :failed_attempts, default: 0, null: false # Only if lock strategy is :failed_attempts
38      # t.string   :unlock_token # Only if unlock strategy is :email or :both
39      # t.datetime :locked_at
40
41
42      t.timestamps null: false
43    end
44
45    add_index :users, :nickname,             unique: true
46    add_index :users, :email,                unique: true
47    add_index :users, :reset_password_token, unique: true
48    # add_index :users, :confirmation_token,   unique: true
49    # add_index :users, :unlock_token,         unique: true
50  end
51end