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我正在尝试near在带有 postgres 数据库的 Rails 应用程序中使用 Ruby geocoder gem 的方法。

 @users = Contact.near(params[:search], params[:distance])

该行会产生您在下面看到的“操作员不存在错误”。搜索参数将是地址和 dist

在 Contact.rb 模型中，我这样做

geocoded_by :full_address

 def full_address

   self.address + self.city + self.province + self.postal
 end

你能告诉我我可能做错了什么吗？错误说，“您可能需要添加显式类型转换。”

Address, city,province和postal都是字符串。

PG::Error: ERROR: operator does not exist: numeric - character varying LINE 1: ...8.755864232 * 2 * ASIN(SQRT(POWER(SIN((43.7058645 - contacts... ^ HINT: No operator matches the given name and argument type(s). You might need to add explicit type casts. : SELECT contacts.*, 3958.755864232 * 2 * ASIN(SQRT(POWER(SIN((43.7058645 - contacts.latitude) * PI() / 180 / 2), 2) + COS(43.7058645 * PI() / 180) * COS(contacts.latitude * PI() / 180) * POWER(SIN((-79.3687137 - contacts.longitude) * PI() / 180 / 2), 2))) AS distance, CAST(DEGREES(ATAN2( RADIANS(contacts.longitude - -79.3687137), RADIANS(contacts.latitude - 43.7058645))) + 360 AS decimal) % 360 AS bearing FROM "contacts" WHERE (contacts.latitude BETWEEN 43.676918143377826 AND 43.73481085662217 AND contacts.longitude BETWEEN -79.40875589075141 AND -79.3286715092486 AND 3958.755864232 * 2 * ASIN(SQRT(POWER(SIN((43.7058645 - contacts.latitude) * PI() / 180 / 2), 2) + COS(43.7058645 * PI() / 180) * COS(contacts.latitude * PI() / 180) * POWER(SIN((-79.3687137 - contacts.longitude) * PI() / 180 / 2), 2))) <= '2') ORDER BY distance ASC LIMIT 1
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