タイトル通りなのですがgem'ransack'なおかつsearch_form_forを使って検索フォームを作成したいです。

現状といたしましては、
index.html.erb

ruby
1<%= search_form_for @q, url: users_path do |f| %>
2  <%= f.label :name, "#{t('view.task_name_search')}" %>
3  <%= f.search_field :name_cont, id: 'search_field_name' %>
4  <%= f.label :state, "#{t('view.task_state_search')}" %>
5  <%= f.select :state_eq, ['未着手','着手中','完了'], include_blank: "指定無し" %>
6  <%= f.submit "#{t('view.search')}" %>
7<% end %>
8
9<!--<div class="cotainer">-->
10<table class="table">
11  <thead>
12  <tr>
13    <th>duty</th>
14    <th>Details</th>
15    <th>expired_at</th>
16    <th>state</th>
17    <th>priority</th>
18    <th>labels</th>
19    <!--      <th colspan="5"></th>-->
20  </tr>
21  </thead>
22  <tbody>
23  <% @users.each do |blog| %>
24    <tr>
25      <td><%= blog.name %></td>
26      <td><%= blog.details %></td>
27      <td><%= l blog.expired_at, format: :short %></td>
28      <td><%= blog.state %></td>
29      <td><%= blog.priority %></td>
30      <% blog.labelings.each do |labeling| %>
31        <td><%= labeling.label.label_name %></td>
32      <% end %>
33      <td><%= link_to "#{t('view.show')}", blog, class: "btn btn-primary" %></td>
34      <td><%= link_to "#{t('view.edit')}", edit_blog_path(blog),class: "btn btn-success" %></td>
35      <td><%= link_to "#{t('view.destory')}", blog, method: :delete, data: { confirm: "#{t('view.confirm')}" },class: 'btn btn-danger' %></td>
36    </tr>
37  <% end %>
38  <%= paginate @users %>
39  </tbody>
40</table>

users_controller.rb

ruby
1def index
2    @q = Blog.ransack(params[:q])
3    # binding.pry
4    if params[:q].present?
5      @users = @q.result(distinct: true).page(params[:page]).per(7)
6      # binding.pry
7    elsif params[:expired_at].present?
8      @users = User.find(current_user.id).blogs.page(params[:page]).per(7).order(expired_at: :DESC)
9    elsif params[:priority].present?
10      @users = User.find(current_user.id).blogs.page(params[:page]).per(7).order(priority: :DESC)
11    else
12      @users = User.find(current_user.id).blogs.page(params[:page]).per(7)
13      # binding.pry
14    end
15    # binding.pry
16  end

以下のような形で中間テーブルにBlogモデルに紐づいたラベルを登録させています。

ruby
1<% Label.all.each do |label| %>
2    <% unless label.user_id == current_user.id %>
3      <%= form.check_box :label_ids, { multiple: true, checked: label[:checked], disabled: label[:disabled], include_hidden: false }, label[:id] %>
4    <label><%= label.label_name %></label>
5    <% end %>

schema.rb

ruby:schema.rb
1ActiveRecord::Schema.define(version: 2019_08_05_082729) do
2
3  # These are extensions that must be enabled in order to support this database
4  enable_extension "plpgsql"
5
6  create_table "blogs", force: :cascade do |t|
7    t.string "name", null: false
8    t.text "details", null: false
9    t.datetime "created_at", null: false
10    t.datetime "updated_at", null: false
11    t.datetime "expired_at", default: "2019-08-03 20:25:28", null: false
12    t.string "state", default: "完了", null: false
13    t.integer "priority", default: 0, null: false
14    t.bigint "user_id"
15    t.index ["user_id"], name: "index_blogs_on_user_id"
16  end
17
18  create_table "labelings", force: :cascade do |t|
19    t.integer "blog_id"
20    t.integer "label_id"
21    t.datetime "created_at", null: false
22    t.datetime "updated_at", null: false
23  end
24
25  create_table "labels", force: :cascade do |t|
26    t.string "label_name"
27    t.datetime "created_at", null: false
28    t.datetime "updated_at", null: false
29    t.integer "blog_id"
30    t.bigint "user_id"
31    t.index ["user_id"], name: "index_labels_on_user_id"
32  end
33
34  create_table "users", force: :cascade do |t|
35    t.string "name"
36    t.string "email"
37    t.datetime "created_at", null: false
38    t.datetime "updated_at", null: false
39    t.string "password_digest"
40    t.boolean "administrator", default: false, null: false
41  end
42
43  add_foreign_key "blogs", "users"
44  add_foreign_key "labels", "users"
45end

blog.rb

ruby
1class Blog < ApplicationRecord
2  validates :name, presence: true
3  validates :details, presence: true
4
5  enum priority:{"低": 0, "中": 1, "高": 2}
6
7  belongs_to :user
8  has_many :labelings, dependent: :destroy
9  has_many :labels, through: :labelings
10
11  has_many :task_have_labels, through: :labelings, source: :label
12  # accepts_nested_attributes_for :labels, allow_destroy: true
13  # reject_if: all_blank
14end

label.rb

ruby
1class Label < ApplicationRecord
2  has_many :labelings, dependent: :destroy
3  belongs_to :user, optional: true
4  belongs_to :blog, optional: true
5end

labeling.rb

ruby
1class Labeling < ApplicationRecord
2  belongs_to :blog
3  belongs_to :label
4end

user.rb

ruby
1class User < ApplicationRecord
2  before_validation { email.downcase! }
3  before_destroy :last_one_administrator
4  has_many :blogs, dependent: :destroy
5  has_many :labels, dependent: :destroy
6  validates :name, presence: true, length: { maximum: 30 }
7  validates :email, presence: true, length: { maximum: 255 }, uniqueness: true,
8            format: { with: /\A[\w+\-.]+@[a-z\d\-.]+.[a-z]+\z/i }
9  has_secure_password
10  validates :password, presence: true, length: { minimum: 6 }
11
12  private
13
14  def last_one_administrator
15    admin_user = User.where(administrator: true)
16    if admin_user.count == 1 && administrator
17      throw :abort
18    else
19    end
20  end
21end

になります、このindex.html.erbのsearch_form_forにusers_controllerのindexからパラメータを渡しLabelモデルのlabel_nameカラムに登録されている、ラベルで検索フォームを作成したいのですが、うまくいきません。
以下の検索フォームに追加する形作りたいです。

ruby
1<%= search_form_for @q, url: users_path do |f| %>
2  <%= f.label :name, "#{t('view.task_name_search')}" %>
3  <%= f.search_field :name_cont, id: 'search_field_name' %>
4  <%= f.label :state, "#{t('view.task_state_search')}" %>
5  <%= f.select :state_eq, ['未着手','着手中','完了'], include_blank: "指定無し" %>
6　※ここにラベルを選択ボックスの形で検索できるようにしたいがどのように記述すれば良いかわかりません
7  <%= f.submit "#{t('view.search')}" %>
8<% end %>