ruby - Re-enable Rails 4 auto-EXPLAIN -

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automatic explain on slow-running sql queries. feature has been removed rails 4.

config.active_record.auto_explain_threshold_in_seconds = 0.5

we find useful, in controlled circumstances. came short in searching answers following questions.

  1. what underlying rationale removing auto-explain?
    (i'm sure reasons sound, can't find are.)

  2. is there way reintroduce auto-explain in rails 4 codebase?
    (couldn't find gem, nor online information)

here commit removed auto_explain. looks reasoning used , problematic w/ asset pipeline. commit notes can still use activerecord::relation#explain generate explain queries, if want have automatically called have implement yourself. looking on removed code in commit should on right path.


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