Class: ActiveRecord::ExplainSubscriber

Inherits:
Object
  • Object
show all
Defined in:
lib/active_record/explain_subscriber.rb

Overview

:nodoc:

Constant Summary collapse

IGNORED_PAYLOADS =

SCHEMA queries cannot be EXPLAINed, also we do not want to run EXPLAIN on our own EXPLAINs now matter how loopingly beautiful that would be.

On the other hand, we want to monitor the performance of our real database queries, not the performance of the access to the query cache.

%w(SCHEMA EXPLAIN CACHE)
EXPLAINED_SQLS = 
/\A\s*(with|select|update|delete|insert)\b/i

Instance Method Summary collapse

Instance Method Details

#finish(name, id, payload) ⇒ Object 



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# File 'lib/active_record/explain_subscriber.rb', line 10

def finish(name, id, payload)
  if ExplainRegistry.collect? && !ignore_payload?(payload)
    ExplainRegistry.queries << payload.values_at(:sql, :binds)
  end
end

#ignore_payload?(payload) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/explain_subscriber.rb', line 23

def ignore_payload?(payload)
  payload[:exception] || IGNORED_PAYLOADS.include?(payload[:name]) || payload[:sql] !~ EXPLAINED_SQLS
end

#start(name, id, payload) ⇒ Object 



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# File 'lib/active_record/explain_subscriber.rb', line 6

def start(name, id, payload)
  # unused
end