Question

我正在使用Place模型处理Rails 5.2项目，该项目由Geocoder gem进行地理编码。

到目前为止，一切似乎都运行良好，除非我从控制器处理搜索运行Place.near("a valid location")，我得到以下错误：

Mysql2::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '*, 6371.0 * 2 * ASIN(SQRT(POWER(SIN((-31.9575512 - places.latitude) * PI() / ' at line 1: SELECT COUNT(places.*, 6371.0 * 2 * ASIN(SQRT(POWER(SIN((-31.9575512 - places.latitude) * PI() / 180 / 2), 2) + COS(-31.9575512 * PI() / 180) * COS(places.latitude * PI() / 180) * POWER(SIN((115.9160093 - places.longitude) * PI() / 180 / 2), 2))) AS distance, MOD(CAST((ATAN2( ((places.longitude - 115.9160093) / 57.2957795), ((places.latitude - -31.9575512) / 57.2957795)) * 57.2957795) + 360 AS decimal), 360) AS bearing) FROM `places` WHERE (places.latitude BETWEEN -32.13741552118375 AND -31.777686878816255 AND places.longitude BETWEEN 115.7040152609056 AND 116.12800333909439 AND (6371.0 * 2 * ASIN(SQRT(POWER(SIN((-31.9575512 - places.latitude) * PI() / 180 / 2), 2) + COS(-31.9575512 * PI() / 180) * COS(places.latitude * PI() / 180) * POWER(SIN((115.9160093 - places.longitude) * PI() / 180 / 2), 2)))) BETWEEN 0.0 AND 20)

从Rails控制台执行时，这条确切的行完美地运行...

关于为什么差异会受到高度赞赏的任何想法。

放置模型

class Place < ApplicationRecord
  ...

  geocoded_by :full_address
  after_validation :geocode

  reverse_geocoded_by :latitude, :longitude do |obj, results|
    if geo = results.first
      obj.place_id = geo.place_id
    end
  end
  after_validation :reverse_geocode

  def full_address
    "#{title}, #{street_address}, #{suburb} #{state} #{zip}, #{country}"
  end

  ...
end

SearchController

class SearchController < ApplicationController
  def search
    # places = Place.all
    # places = places.where('title LIKE ?', "%#{params[:title]}%") if params[:title].present?
    # places = places.near(params[:location]) if params[:location].present?

    @places = Place.near("Perth, Western Australia")

    # @places = places
  end
end

更新

自发布此问题以来，我发现调用.inspect会在控制台和视图中打印完整的ActiveRecord :: Relation，两者（即：with {{ 1}}调用控制器），调用.near会在控制台和视图中产生上述错误两者。我认为这改变了一些事情......

非常感谢任何帮助！

Answer 1

似乎near范围由地理编码宝石和Rails＆＃39;构建。对关系的计算并不能很好地发挥作用。

只需强制Rails加载关系，然后再调用其他方法，例如any?或blank?。

@places = Place.near("Perth, Western Australia").load

在您的视图中使用@places.size代替@places.count，因为size不会触发其他数据库查询，但会在已经加载关系时返回元素数组

Geocoder .near（）从控制器操作调用抛出MySQL语法错误 - Rails 5.2

更新

1 个答案: