Class: AndOne::RSpecHelper::CauseNPlusOne

Inherits:
Object
  • Object
show all
Defined in:
lib/and_one/matchers.rb

Instance Method Summary collapse

Instance Method Details

#description ⇒ Object 



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# File 'lib/and_one/matchers.rb', line 109

def description
  "cause N+1 queries"
end

#failure_message ⇒ Object 



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# File 'lib/and_one/matchers.rb', line 94

def failure_message
  "expected the block to cause N+1 queries, but none were detected"
end

#failure_message_when_negated ⇒ Object 



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# File 'lib/and_one/matchers.rb', line 98

def failure_message_when_negated
  formatter = AndOne::Formatter.new(
    backtrace_cleaner: AndOne.backtrace_cleaner || AndOne.send(:default_backtrace_cleaner)
  )
  detail = formatter.format(@detections)
  summary = @detections.map do |d|
    "#{d.count} queries to `#{d.table_name || "unknown"}` (expected 1)"
  end.join("; ")
  "expected no N+1 queries, but #{@detections.size} detected: #{summary}\n#{detail}"
end

#matches?(block) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/and_one/matchers.rb', line 89

def matches?(block)
  @detections = scan_block(block)
  @detections.any?
end

#supports_block_expectations? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/and_one/matchers.rb', line 85

def supports_block_expectations?
  true
end