Question

我有一个商业模式和这样的地址模型

class Business < ActiveRecord::Base
  has_one :address, as: :addressable
end

class Address < ActiveRecord::Base
  belongs_to :addressable, polymorphic: true
end

现在奇怪的部分。如果我运行以下

Business.includes(:address).where(['email like ?', '%whatever%'])

生成两个查询

SELECT `businesses`.* FROM `businesses` WHERE (email like '%whatever%')
SELECT `addresses`.* FROM `addresses` WHERE `addresses`.`addressable_type` = 'Business' AND `addresses`.`addressable_id` IN (26)

但是如果在like子句中出现的文本有一个点（'。'），如下面的

Business.includes(:address).where(['email like ?', '%what.ever%'])

这次使用JOIN生成单个查询

SELECT `businesses`.`id` AS t0_r0, `businesses`.`name` AS t0_r1, `businesses`.`primary_category_id` AS t0_r2, `businesses`.`secondary_category_id` AS t0_r3, `businesses`.`sub_primary_category_id` AS t0_r4, `businesses`.`sub_secondary_category_id` AS t0_r5, `businesses`.`website` AS t0_r6, `businesses`.`phone` AS t0_r7, `businesses`.`manager_name` AS t0_r8, `businesses`.`manager_phone` AS t0_r9, `businesses`.`email` AS t0_r10, `businesses`.`created_at` AS t0_r11, `businesses`.`updated_at` AS t0_r12, `businesses`.`encrypted_password` AS t0_r13, `businesses`.`reset_password_token` AS t0_r14, `businesses`.`reset_password_sent_at` AS t0_r15, `businesses`.`remember_created_at` AS t0_r16, `businesses`.`sign_in_count` AS t0_r17, `businesses`.`current_sign_in_at` AS t0_r18, `businesses`.`last_sign_in_at` AS t0_r19, `businesses`.`current_sign_in_ip` AS t0_r20, `businesses`.`last_sign_in_ip` AS t0_r21, `businesses`.`confirmation_token` AS t0_r22, `businesses`.`confirmed_at` AS t0_r23, `businesses`.`confirmation_sent_at` AS t0_r24, `businesses`.`failed_attempts` AS t0_r25, `businesses`.`unlock_token` AS t0_r26, `businesses`.`locked_at` AS t0_r27, `addresses`.`id` AS t1_r0, `addresses`.`line1` AS t1_r1, `addresses`.`line2` AS t1_r2, `addresses`.`city` AS t1_r3, `addresses`.`country` AS t1_r4, `addresses`.`zip` AS t1_r5, `addresses`.`neighbourhood` AS t1_r6, `addresses`.`addressable_id` AS t1_r7, `addresses`.`addressable_type` AS t1_r8, `addresses`.`created_at` AS t1_r9, `addresses`.`updated_at` AS t1_r10, `addresses`.`latitude` AS t1_r11, `addresses`.`longitude` AS t1_r12, `addresses`.`gmaps` AS t1_r13 FROM `businesses` LEFT OUTER JOIN `addresses` ON `addresses`.`addressable_id` = `businesses`.`id` AND `addresses`.`addressable_type` = 'Business' WHERE (email like '%what.ever%')

我已尝试使用like子句的不同值，并注意到JOIN查询仅在输入有点（'。'）时产生，并且在点（'。'）之前至少有2个字符。

几个例子

'无论什么'导致2个没有JOIN的查询
'w。什么'导致2个查询没有加入
'w.h'导致2个没有JOIN的查询
'w.ha'导致2个没有JOIN的查询
'瓦特'导致2个没有JOIN的查询
'xxxxxxxxw.what'导致1个JOIN查询
'what.ever'导致1个JOIN查询
'WH。'导致1个查询加入

我的猜测是这与Rails有关，认为如果where子句中有一个点它可能引用另一个表，所以应该应用一个连接，如果没有一个点或者只有一个点之前的一个字符（可能是表名不能是y的单个字符..猜测!!）而不是它生成2个查询。

有人见过这种问题吗？我正在使用Rails 3.2

Rails Active Record Query Generation - 使用includes和dot（'。'）时的奇怪行为

0 个答案: