Geocoder:.nearbys方法抛出ActionView :: Template :: Error(对于nil:NilClass,未定义方法“ each”):

时间:2018-12-06 00:07:41

标签: ruby-on-rails ruby rails-geocoder

我正在尝试在我的应用中实现地址解析器。我想在每个地方的页面上显示附近的地方。我不断收到此错误:

ActionView::Template::Error (undefined method `each' for nil:NilClass):
    38:            
    39:               %h4 Nearby places
    40:               - @place.nearbys.each do |place|
    41:                 %li
    42:                   = link_to place.name, place
    43:                   (#{place.distance.round(2)} kilometers)

app/views/places/show.html.haml:40:in `_app_views_places_show_html_haml__1604860997730316275_70230188982160'

我认为这与某些地方进行了地理编码有关,而其他地方则没有。例如,对于我在控制台中拥有的该地址,纬度和经度值输出nil,而.geocode方法对此不起作用。但是,对于其他地址,纬度和经度值是自动生成的(按预期方式)。这是我的代码: 放置型号:

class Place < ApplicationRecord
  geocoded_by :full_address
  after_validation :geocode, if: :address_changed?

  def full_address
    [address1, address2, city, region].compact.join(", ")
  end

  def address_changed?
    address1_changed? || address2_changed? || city_changed? || region_changed?
  end


end

位置控制器:

def show
  @place = Place.find(params[:id])
end


def create
    @place = Place.new(place_params)
    respond_to do |format|
      if @place.save
        format.html { redirect_to @place, notice: 'Place was successfully created.' }
        format.json { render :show, status: :created, location: @place }
      else
        format.html { render :new }
        format.json { render json: @place.errors, status: :unprocessable_entity }
      end
    end
  end

地点显示视图:

          %p= @place.address1
          %p= @place.address2
          %p= @place.city
          %p= @place.region
          %p= @place.phone
          %p= @place.email

          #mapid
           %h4 Nearby places
           - @place.nearbys.each do |place|
             %li
              = link_to place.name, place
              (#{place.distance.round(2)} kilometers)



def place_params
      params.require(:place).permit(:name, :description, :address1, :address2, :city, :region, :phone, :email)
    end

因此,我只能烧蚀使用一些地址创建新地点,而我可以使用其他地址。如何防止此错误?我在想也许有一种方法可以检查位置纬度和经度是否已生成。如果不是,则在保存之前生成它们。如何实现这些条件?

1 个答案:

答案 0 :(得分:2)

您可以在此处进行简单的验证,例如

if @place.nearbys.present?
  - @place.nearbys.each do |place|
    %li
      = link_to place.name, place
      (#{place.distance.round(2)} kilometers)
   ...