将 Rails 与 ActiveRecord(和 PostgreSQL)一起使用时,执行“简单”查询会为它们添加一个名称,例如打电话
Article.all
# => Article Load (2.6ms) SELECT "articles".* FROM "articles"
命名查询 Article Load
.但是,当执行稍微复杂的查询时,不会生成名称,例如Article.group(:article_group_id).count
# => (1.2ms) SELECT COUNT(*) AS count_all, "articles"."article_group_id" AS articles_article_group_id FROM "articles" GROUP BY "articles"."article_group_id"
如果使用 execute
执行自定义查询,我可以添加名称方法:ActiveRecord::Base.connection.execute("SELECT * FROM articles", "My custom query name")
# => My custom query name (2.5ms) SELECT * FROM articles
但是有没有办法将自定义名称添加到使用 ActiveRecord 方法构建的查询中?如果您想知道为什么:该名称可用于各种监控,例如在 AppSignal 中查看慢查询时。
最佳答案
由于您只想自定义查询名称以进行监控,所以我认为您只需要更改 query name
在 ActiveRecord::ConnectionAdapters#log
方法,该方法是记录执行的sql查询,包括query name
.
这是我的解决方案:
# lib/active_record/base.rb
# note that MUST be base.rb
# otherwise you need to add initializer to extend Rails core
#
module ActiveRecord
module ConnectionAdapters
class AbstractAdapter
attr_accessor :log_tag
private
alias old_log log
def log(sql, name = "SQL", binds = [], type_casted_binds = [], statement_name = nil)
if name != 'SCHEMA'
name = @log_tag
@log_tag = nil # reset
end
old_log(sql, name, binds, type_casted_binds, statement_name) do
yield
end
end
end
end
module QueryMethods
def log_tag(tag_name) # class method
spawn.log_tag(tag_name)
self
end
end
module Querying
delegate :log_tag, to: :all
end
class Relation
def log_tag(tag_name) # instance method
conn = klass.connection
conn.log_tag = tag_name
self
end
end
end
演示Task.log_tag("DEMO").group(:status).count
# DEMO (0.7ms) SELECT COUNT(*) AS count_all, "tasks"."status" AS tasks_status FROM "tasks" GROUP BY "tasks"."status"
Task.where(status: 6).log_tag("SIX").first(20)
# SIX (0.8ms) SELECT "tasks".* FROM "tasks" WHERE "tasks"."status" = ? ORDER BY "tasks"."id" ASC LIMIT ?
Task.where(status: 6).first(20)
# (0.8ms) SELECT "tasks".* FROM "tasks" WHERE "tasks"."status" = ? ORDER BY "tasks"."id" ASC LIMIT ?
备注 如果您想修复
query name
对于特定查询,可以使用hash,key是整个特定sql字符串(或者整个sql的hash,比如Rails核心缓存查询的方式:query_signature = ActiveSupport::Digest.hexdigest(to_sql)
),值为query name
你要。# set up before hand
ActiveRecord::ConnectionAdapters::LogTags[Product.where...to_sql] = "DEMO"
# AbstractAdapter
LogTags = Hash.new
def log(sql, name...)
name = LogTags[sql]
# ...
end
关于sql - 在 Rails/ActiveRecord 中命名 SQL 查询,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/67328852/