Class: RuboCop::Cop::Rails::DurationArithmetic

Inherits:
Base
  • Object
show all
Extended by:
AutoCorrector
Defined in:
lib/rubocop/cop/rails/duration_arithmetic.rb

Overview

This cop checks if a duration is added to or subtracted from `Time.current`.

Examples:

# bad
Time.current - 1.minute
Time.current + 2.days

# good - using relative would make it harder to express and read
Date.yesterday + 3.days
created_at - 1.minute
3.days - 1.hour

# good
1.minute.ago
2.days.from_now

Constant Summary collapse

MSG = 
'Do not add or subtract duration.'
RESTRICT_ON_SEND = 
%i[+ -].freeze
DURATIONS = 
Set[:second, :seconds, :minute, :minutes, :hour, :hours,
:day, :days, :week, :weeks, :fortnight, :fortnights]

Instance Method Summary collapse

Instance Method Details

#duration?(node) ⇒ Boolean

Match a literal Duration

Examples:

source that matches

1.hour

source that matches

9.5.weeks

Parameters:

  • node (RuboCop::AST::Node)

Returns:

  • (Boolean) —

    true if matches



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# File 'lib/rubocop/cop/rails/duration_arithmetic.rb', line 57

def_node_matcher :duration?, '(send { int float (send nil _) } DURATIONS)'

#duration_arithmetic_argument?(node) { ... } ⇒ Object

Match duration subtraction or addition with current time.

Examples:

source that matches

Time.current - 1.hour

source that matches

::Time.zone.now + 1.hour

Parameters:

  • node (RuboCop::AST::Node)

Yields:

  • operator and duration



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# File 'lib/rubocop/cop/rails/duration_arithmetic.rb', line 42

def_node_matcher :duration_arithmetic_argument?, <<~PATTERN
  (send #time_current? ${ :+ :- } $#duration?)
PATTERN

#on_send(node) ⇒ Object 



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# File 'lib/rubocop/cop/rails/duration_arithmetic.rb', line 77

def on_send(node)
  duration_arithmetic_argument?(node) do |*operation|
    add_offense(node) do |corrector|
      corrector.replace(node.source_range, corrected_source(*operation))
    end
  end
end

#time_current?(node) ⇒ Boolean

Match Time.current

Examples:

source that matches

Time.current

source that matches

::Time.zone.now

Parameters:

  • node (RuboCop::AST::Node)

Returns:

  • (Boolean) —

    true if matches



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# File 'lib/rubocop/cop/rails/duration_arithmetic.rb', line 70

def_node_matcher :time_current?, <<~PATTERN
  {
    (send (const _ :Time) :current)
    (send (send (const _ :Time) :zone) :now)
  }
PATTERN