Method included
has a Cognitive Complexity of 16 (exceeds 5 allowed). Consider refactoring. Open
def self.included(base) # rubocop:todo Metrics/AbcSize, Metrics/MethodLength
base.class_eval do
# We probably want to move this validation
validates_each(:project, if: :checking_project?) do |record, _attr, project|
record.errors.add(:base, "Project #{project.name} is not approved") unless project.approved?
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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
Complex method Submission::ProjectValidation::included (39.8) Open
def self.included(base) # rubocop:todo Metrics/AbcSize, Metrics/MethodLength
base.class_eval do
# We probably want to move this validation
validates_each(:project, if: :checking_project?) do |record, _attr, project|
record.errors.add(:base, "Project #{project.name} is not approved") unless project.approved?
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- Exclude checks
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
Submission::ProjectValidation#self.included has approx 8 statements Open
def self.included(base) # rubocop:todo Metrics/AbcSize, Metrics/MethodLength
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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.)
Submission::ProjectValidation#self.included calls 'project.name' 4 times Open
record.errors.add(:base, "Project #{project.name} is not approved") unless project.approved?
record.errors.add(:base, "Project #{project.name} is not active") unless project.active?
record.errors.add(:base, "Project #{project.name} does not have a budget division") unless project.actionable?
end
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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.
Submission::ProjectValidation has no descriptive comment Open
module Submission::ProjectValidation
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Classes and modules are the units of reuse and release. It is therefore considered good practice to annotate every class and module with a brief comment outlining its responsibilities.
Example
Given
class Dummy
# Do things...
end
Reek would emit the following warning:
test.rb -- 1 warning:
[1]:Dummy has no descriptive comment (IrresponsibleModule)
Fixing this is simple - just an explaining comment:
# The Dummy class is responsible for ...
class Dummy
# Do things...
end
Submission::ProjectValidation::Error has no descriptive comment Open
Error = Class.new(StandardError)
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Classes and modules are the units of reuse and release. It is therefore considered good practice to annotate every class and module with a brief comment outlining its responsibilities.
Example
Given
class Dummy
# Do things...
end
Reek would emit the following warning:
test.rb -- 1 warning:
[1]:Dummy has no descriptive comment (IrresponsibleModule)
Fixing this is simple - just an explaining comment:
# The Dummy class is responsible for ...
class Dummy
# Do things...
end
Submission::ProjectValidation#self.included calls 'record.errors' 4 times Open
record.errors.add(:base, "Project #{project.name} is not approved") unless project.approved?
record.errors.add(:base, "Project #{project.name} is not active") unless project.active?
record.errors.add(:base, "Project #{project.name} does not have a budget division") unless project.actionable?
end
- Read upRead up
- Exclude checks
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.