分页Rails的问题

Question

当我尝试转到下一页时，它会重定向到第一页。添加排序和搜索后出现此问题。也许路线有问题。

BoardController

class BoardController < ApplicationController
  def index
    if params[:set_locale]
      redirect_to board_url(locale: params[:set_locale])
    else
      @search = Ad.published.search(params[:q])
      @ads = @search.result.page(params[:page])
      @search.build_condition
      @search.build_sort if @search.sorts.empty?
    end
  end

  def search
    index
    render :index
  end
end

Board Index.html.slim

= search_form_for @search, url: search_ads_path, method: :post do |f|
  = f.condition_fields do |c|
    = render "condition_fields", f: c
  .field
   = t('.sort')
   = f.sort_fields do |s|
    = s.sort_select
  .actions
    = f.submit t('.look_for')

  ...

 = paginate @ads

_condition_fileds

.field
  = f.attribute_fields do |a|
    = a.attribute_select associations: [:category]
  = f.predicate_select
  = f.value_fields do |v|
    = v.text_field :value
  = link_to t('.remove'), '#', class: "remove_fields"

路线

Rails.application.routes.draw do
  resources :users
  get 'home/index'
  get 'board/index'
  scope '(:locale)' do
    resources :images
    devise_for :users
    resources :categories
    resources :ads do
      collection do
       get 'search'
      end
      collection { post :search, to: 'board#index' }
    end
    root to: 'board#index', as: 'board', via: :all
  end
end