如何将这些方法链接在一起（地理编码器+分页）答案

【问题标题】：How to chain these methods together (Geocoder + Pagination)如何将这些方法链接在一起（地理编码器+分页）
【发布时间】：2015-06-03 15:20:03
【问题描述】：

我目前有一个使用地理编码器 gem 的位置数组：

@locations = Location.near([@lat, @lon], 3)

产生：

=> [#<Location id: 18, address: "555 N 7th Ave, Jamaica, CA  66666", phone: "(623) 555-5555", latitude: 66.666, longitude: -200.082, user_id:  1, created_at: "2015-03-11 15:06:57", updated_at: "2015-03-11 15:06:57">,

#<Location id: 46, address: "555 N 7th Ave, Jamaica, CA  66666", phone: "(623) 555-5555", latitude: 66.666, longitude: -200.082, user_id: 1, created_at: "2015-03-11 15:06:57", updated_at: "2015-03-11 15:06:57">]

我正在尝试使用

为这些结果添加分页

@locations = Location.near([@lat, @lon], 3).paginate(:page => params[:page], :per_page => 5)

在视图中（haml）：

= will_paginate @locations

但我收到以下错误：

ActionView::Template::Error (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 '*, 3958.755864232 * 2 * ASIN(SQRT(POWER(SIN((33.457341299999996 - locations.lati' at line 1: SELECT COUNT(locations.*, 3958.755864232 * 2 * ASIN(SQRT(POWER(SIN((33.457341299999996 - locations.latitude) * PI() / 180 / 2), 2) + COS(33.457341299999996 * PI() / 180) * COS(locations.latitude * PI() / 180) * POWER(SIN((-112.07359500000001 - locations.longitude) * PI() / 180 / 2), 2))) AS distance, MOD(CAST((ATAN2( ((locations.longitude - -112.07359500000001) / 57.2957795), ((locations.latitude - 33.457341299999996) / 57.2957795)) * 57.2957795) + 360 AS decimal), 360) AS bearing) FROM `locations`  WHERE (locations.latitude BETWEEN 33.41392176506674 AND 33.50076083493325 AND locations.longitude BETWEEN -112.12563828858949 AND -112.02155171141054 AND (3958.755864232 * 2 * ASIN(SQRT(POWER(SIN((33.457341299999996 - locations.latitude) * PI() / 180 / 2), 2) + COS(33.457341299999996 * PI() / 180) * COS(locations.latitude * PI() / 180) * POWER(SIN((-112.07359500000001 - locations.longitude) * PI() / 180 / 2), 2)))) BETWEEN 0.0 AND 3)):

有什么想法吗？

【问题讨论】：

我现在也看到分页自然不适用于普通数组（但分页集合），仍然不明白sql错误。
同样的代码非常适合我。

标签： ruby-on-rails pagination rails-geocoder

【解决方案1】：

您是否尝试过在模板中单独渲染@locations？这是我通常使用的模式：

= will_paginate
render @locations
= will_paginate

这至少可以帮助您隔离问题。

【讨论】：