Sql Rails 3，准备好的查询不使用nil值

这是我的问题

query = "(description = ? AND address1 = ?) AND (city = (?) OR old_city = (?) OR cb_city = (?))"

输入数据：

office_data = {"description"=>"Europe HQ", "city"=>"Dublin", "street_1"=>nil}

但当我询问

 office = company.offices.where(query, office_data["description"], office_data["street_1"], office_data["city"], office_data["city"], office_data["city"]).first

等效SQL：

SELECT "offices".* FROM "offices" WHERE "offices"."company_id" = 6 AND ((description = 'Europe HQ' AND address1 = NULL) AND (city = ('Dublin') OR old_city = ('Dublin') OR cb_city = ('Dublin'))) LIMIT 1

结果是

nil

虽然我是公司的记录员

作为

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不知道查询有什么问题吗？有人知道怎么了吗

问题是使用=符号将地址与NULL进行比较-除此之外的所有针对NULL的操作都是false。正因为如此，你最终得到了真与假和…，最终导致了假

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请注意，您在注释中添加的第二个查询不包含address=NULL，这就是它在这种情况下工作的原因。

正如@misha和@Victor所指出的，问题确实是NULL=。要解决此问题，请更改查询参数，如下所示：

查询=描述=？地址1=？或address1为空且city=或old_city=或cb_city=

无需更改office_数据参数或您的查询

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同样，您可能还需要更改城市和其他参数。因为它们也可以有一个空值

似乎数据库中有city:nil，但是，在查询中，city='Dublin'或old_city='Dublin'或cb_city='Dublin'，那么，在生成的SQL中，address1=NULL，应该是address1。我不知道怎么解决这个问题。@RAJ。。。不，实际上，当我尝试使用office=f.offices.wherequery、office\u data[city]、office\u data[city]、office\u data[city]时。首先，我得到的结果是记录，我认为这不是问题所在，请选择office.*从office.company\u id=6和city='Dublin'或old\u city='Dublin'或cb\u city='Dublin'LIMIT 1的办公室获取结果

[#<Office id: 393, company_id: 6, description: "Europe HQ", address1: nil, address2: nil, zip_code: nil, city: nil, state_code: nil, country_code: nil, latitude: nil, longitude: nil, created_at: "2014-08-19 15:13:58", updated_at: "2014-08-19 15:13:58", cb_city: "Dublin", cb_state_code: nil, cb_country_code: "IRL", old_city: nil, region_code: nil, is_hq: nil, cb_region: "Dublin", cb_updated: "2014-04-20 10:53:24", city_uuid: "97c70aa17568ca5375122f181f0484a7", city_path: "location/dublin/97c70aa17568ca5375122f181f0484a7">, #<Office id: 389, company_id: 6, description: "Europe HQ", address1: nil, address2: nil, zip_code: nil, city: nil, state_code: nil, country_code: nil, latitude: nil, longitude: nil, created_at: "2014-08-19 15:02:44", updated_at: "2014-08-19 15:02:44", cb_city: "Dublin", cb_state_code: nil, cb_country_code: "IRL", old_city: nil, region_code: nil, is_hq: nil, cb_region: "Dublin", cb_updated: "2014-04-20 10:53:24", city_uuid: "97c70aa17568ca5375122f181f0484a7", city_path: "location/dublin/97c70aa17568ca5375122f181f0484a7">]