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我正在做这样的不同查询：

Offer.where("id IN (?) AND foo = ?", offer_ids, 'bar')

其中 offer_ids 是计算出来的，长度约为 1.000 个 id。

这些会导致 development.log 的条目很长，例如：

Offer Load (12.9ms)  SELECT `offers`.* FROM `offers` WHERE (id IN (156439476,162525730,169378363,197193532,209583012,212783238,236381946,260584008,267542041,140892256,154059101,157130091,158223924,161242255,161410617,169374703,184305303,187582050,234519939,235460328,252011721,253958427,257583669,260506433,262371001,262925076,265363980,266580943,268164854,271348458,272595168,272965063,141293866,162515580,195738185,210118609,210183244,210783954,212896682,219931290,224907551,225764370,227558502,234479337,234536939,236329414,238409428,241871979,245480324,245491111,245507734,253281480,254462074,257921737,265282309,265542934,266584572,267530034,268798204,271548316,272761011,272899348,273012205,119125136,134552742,166766466,169187658,213728958,213732981,225761919,234827176,247156634,247196151,247214973,247659810,259275332,261664338,262780711,267516898,267741935,270442768,271445586,271630463,272560287,272643405,272957626,106364954,205619149,213425974,213731373,243644164,266104747,266428301,266947751,268013142,126413832,157986541,175322047,204080600,205821543,205821564,205830753,205848558,207430869,207442535,207458847,207952331,208122137,213731142,217001805,226506891,228735112,243682190,257949941,265512977,265908636,268833366,269372138,270447643,271237573,59037247,59169923,662 ...) AND foo = 'bar')

我实际上对这些日志条目感兴趣，但不是特定的 ID，并且滚动浏览这些长条目会减慢我的优化速度。

是否有一种宝石或简单的方法可以像 mysql 慢查询日志那样减少日志：

Offer Load (12.9ms)  SELECT `offers`.* FROM `offers` WHERE (id IN (?) AND foo = ?)
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1 回答 1

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我不知道有什么方法可以更改日志。但是，如果您使用的是最新版本的 rails，则可以使用子查询，这可能是防止长行日志记录的一种方法。

例如，

如果您目前有：

offer_ids = @business.offers.map(&:id) # this is an array object
Offer.where("id IN (?) AND foo = ?", offer_ids, 'bar')

您可以将代码重构为：

offer_ids = @business.offers # this is an ActiveRelation object
# offer_ids = @business.select(:id).offers # you can use this line instead of above line

Offer.where(:id => offer_ids, :foo => 'bar')

在这种情况下，您将收到如下查询：

SELECT `offers`.* FROM `offers` WHERE (id IN (SELECT id FROM `offers` WHERE business_id = 4) AND foo = 'bar')

区别在于您传递的是Array对象还是ActiveRelation对象。

ActiveRelation对象是当您使用尚未执行查询的查询方法（如where、select等）时获得的。limit在这种情况下，请注意不要使用诸如count,maximum之类的方法all或任何其他数组方法（例如map, select），这将强制查询运行，从而导致Array.

于 2012-09-06T09:10:07.507 回答