我为什么要在Rails中为nil：NilClass获得未定义的方法“ each”？

我正在搜索。但是我each在搜索视图中出现错误

each for views / housing / index.html.erb工作正常。

但是下面是views/search/search_housing.html.erb我得到的each：

<tbody>
     <% @housings.each do |housing| %>
  <tr>
   <td><%=link_to "#{housing.title}", housing_path(housing.slug) %></td>
   <td><%= housing.category.name %></td>

下面是我的房屋控制器

class HousingsController < ApplicationController
  before_action :set_housing, only: [:show, :edit, :update, :destroy]

  # GET /housings
  # GET /housings.json
  def index
    @housings = Housing.all.order(created_at: :desc).paginate(page: params[:page], per_page: 10)
  end

  # GET /housings/1
  # GET /housings/1.json
  def show
  end

  # GET /housings/new
  def new
    @housing = Housing.new
  end

  # GET /housings/1/edit
  def edit
    if not @housing.user_email == current_user.email || current_user.email == "[email protected]"
      redirect_to @housing
    end
  end

  # POST /housings
  # POST /housings.json
  def create
    @housing = Housing.new(housing_params)
    @housing.user_email = current_user.email

    respond_to do |format|
      if @housing.save
        format.html { redirect_to @housing }
        flash[:success] = "Housing was successfully created."
      else
        format.html { render :new }
        format.json { render json: @housing.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /housings/1
  # PATCH/PUT /housings/1.json
  def update
    respond_to do |format|
      if @housing.update(housing_params)

        format.html { redirect_to @housing }
        format.json { render :show, status: :ok, location: @housing }
        flash[:success] = "Housing was successfully updated."
      else
        format.html { render :edit }
        format.json { render json: @housing.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /housings/1
  # DELETE /housings/1.json
  def destroy
    @housing.destroy
    respond_to do |format|
      format.html { redirect_to housings_url }
      format.json { head :no_content }
      flash[:alert] = "Housing was successfully destroyed."
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_housing
      @housing = Housing.friendly.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def housing_params
      params.require(:housing).permit(:title, :type, :description, :location, :user_email, :created_at, :category_id, :slug)
    end
end

以下是我的搜索控制器

class SearchController < ApplicationController
            def search_housing
                    @housings = Housing.search((params[:search].present? ? params[:search] : '*')).records.order(created_at: :desc)
                    # if params[:search].nil?
                    #     @housings = Housing.all.order(created_at: :desc)
                    # else
                    #     @housings = Housing.search params[:search]
                    # end
                end
    end