Complex method Attributable::Attribute#configure (63.5) Open
def configure(model) # rubocop:todo Metrics/CyclomaticComplexity
conditions = @options.slice(:if, :on)
save_blank_value = @options.delete(:save_blank)
allow_blank = save_blank_value
model.with_options(conditions) do |object|
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Flog calculates the ABC score for methods. The ABC score is based on assignments, branches (method calls), and conditions.
You can read more about ABC metrics or the flog tool
Method configure
has a Cognitive Complexity of 22 (exceeds 5 allowed). Consider refactoring. Open
def configure(model) # rubocop:todo Metrics/CyclomaticComplexity
conditions = @options.slice(:if, :on)
save_blank_value = @options.delete(:save_blank)
allow_blank = save_blank_value
model.with_options(conditions) do |object|
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Cognitive Complexity
Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.
A method's cognitive complexity is based on a few simple rules:
- Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
- Code is considered more complex for each "break in the linear flow of the code"
- Code is considered more complex when "flow breaking structures are nested"
Further reading
Class Attribute
has 23 methods (exceeds 20 allowed). Consider refactoring. Open
class Attribute # rubocop:todo Metrics/ClassLength
attr_reader :name, :default
alias assignable_attribute_name name
Method configure
has 33 lines of code (exceeds 25 allowed). Consider refactoring. Open
def configure(model) # rubocop:todo Metrics/CyclomaticComplexity
conditions = @options.slice(:if, :on)
save_blank_value = @options.delete(:save_blank)
allow_blank = save_blank_value
model.with_options(conditions) do |object|
Attributable::Attribute has at least 6 instance variables Open
class Attribute # rubocop:todo Metrics/ClassLength
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Too Many Instance Variables
is a special case of LargeClass
.
Example
Given this configuration
TooManyInstanceVariables:
max_instance_variables: 3
and this code:
class TooManyInstanceVariables
def initialize
@arg_1 = :dummy
@arg_2 = :dummy
@arg_3 = :dummy
@arg_4 = :dummy
end
end
Reek would emit the following warning:
test.rb -- 5 warnings:
[1]:TooManyInstanceVariables has at least 4 instance variables (TooManyInstanceVariables)
Attributable::Attribute#configure has approx 14 statements Open
def configure(model) # rubocop:todo Metrics/CyclomaticComplexity
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A method with Too Many Statements
is any method that has a large number of lines.
Too Many Statements
warns about any method that has more than 5 statements. Reek's smell detector for Too Many Statements
counts +1 for every simple statement in a method and +1 for every statement within a control structure (if
, else
, case
, when
, for
, while
, until
, begin
, rescue
) but it doesn't count the control structure itself.
So the following method would score +6 in Reek's statement-counting algorithm:
def parse(arg, argv, &error)
if !(val = arg) and (argv.empty? or /\A-/ =~ (val = argv[0]))
return nil, block, nil # +1
end
opt = (val = parse_arg(val, &error))[1] # +2
val = conv_arg(*val) # +3
if opt and !arg
argv.shift # +4
else
val[0] = nil # +5
end
val # +6
end
(You might argue that the two assigments within the first @if@ should count as statements, and that perhaps the nested assignment should count as +2.)
Attributable::Attribute#configure contains iterators nested 2 deep Open
object.with_options(allow_nil: optional?, allow_blank: allow_blank) do |required|
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A Nested Iterator
occurs when a block contains another block.
Example
Given
class Duck
class << self
def duck_names
%i!tick trick track!.each do |surname|
%i!duck!.each do |last_name|
puts "full name is #{surname} #{last_name}"
end
end
end
end
end
Reek would report the following warning:
test.rb -- 1 warning:
[5]:Duck#duck_names contains iterators nested 2 deep (NestedIterators)
Attributable::Attribute has at least 22 methods Open
class Attribute # rubocop:todo Metrics/ClassLength
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Too Many Methods
is a special case of LargeClass
.
Example
Given this configuration
TooManyMethods:
max_methods: 3
and this code:
class TooManyMethods
def one; end
def two; end
def three; end
def four; end
end
Reek would emit the following warning:
test.rb -- 1 warning:
[1]:TooManyMethods has at least 4 methods (TooManyMethods)
Attributable::Attribute tests 'validator?' at least 3 times Open
origin.validator_for(name).default if validator?
end
def validator?
@validator
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Repeated Conditional
is a special case of Simulated Polymorphism
. Basically it means you are checking the same value throughout a single class and take decisions based on this.
Example
Given
class RepeatedConditionals
attr_accessor :switch
def repeat_1
puts "Repeat 1!" if switch
end
def repeat_2
puts "Repeat 2!" if switch
end
def repeat_3
puts "Repeat 3!" if switch
end
end
Reek would emit the following warning:
test.rb -- 4 warnings:
[5, 9, 13]:RepeatedConditionals tests switch at least 3 times (RepeatedConditional)
If you get this warning then you are probably not using the right abstraction or even more probable, missing an additional abstraction.
Attributable::Attribute#configure calls 'conditions[:if]' 2 times Open
return if conditions[:if].nil?
model.class_eval(
"
before_validation do |record|
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Duplication occurs when two fragments of code look nearly identical, or when two fragments of code have nearly identical effects at some conceptual level.
Reek implements a check for Duplicate Method Call.
Example
Here's a very much simplified and contrived example. The following method will report a warning:
def double_thing()
@other.thing + @other.thing
end
One quick approach to silence Reek would be to refactor the code thus:
def double_thing()
thing = @other.thing
thing + thing
end
A slightly different approach would be to replace all calls of double_thing
by calls to @other.double_thing
:
class Other
def double_thing()
thing + thing
end
end
The approach you take will depend on balancing other factors in your code.
Attributable::Attribute#default_from performs a nil-check Open
return nil if origin.nil?
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A NilCheck
is a type check. Failures of NilCheck
violate the "tell, don't ask" principle.
Additionally, type checks often mask bigger problems in your source code like not using OOP and / or polymorphism when you should.
Example
Given
class Klass
def nil_checker(argument)
if argument.nil?
puts "argument isn't nil!"
end
end
end
Reek would emit the following warning:
test.rb -- 1 warning:
[3]:Klass#nil_checker performs a nil-check. (NilCheck)
Attributable::Attribute#configure performs a nil-check Open
return if conditions[:if].nil?
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A NilCheck
is a type check. Failures of NilCheck
violate the "tell, don't ask" principle.
Additionally, type checks often mask bigger problems in your source code like not using OOP and / or polymorphism when you should.
Example
Given
class Klass
def nil_checker(argument)
if argument.nil?
puts "argument isn't nil!"
end
end
end
Reek would emit the following warning:
test.rb -- 1 warning:
[3]:Klass#nil_checker performs a nil-check. (NilCheck)
TODO found Open
# TODO[xxx]: currently only working for metadata, the only place attributes are used
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