Complex method Admin::StudiesController#filter (72.6) Open
def filter # rubocop:todo Metrics/CyclomaticComplexity
filter_conditions = { approved: false } if params[:filter][:by] == 'not approved' unless params[:filter].nil?
if params[:filter][:by] == 'not approved' || params[:filter][:by] == 'all'
@studies = Study.where(filter_conditions).alphabetical.select { |p| p.name.include? params[:q] }
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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
Complex method Admin::StudiesController#managed_update (48.2) Open
def managed_update # rubocop:todo Metrics/AbcSize, Metrics/MethodLength
@study = Study.find(params[:id])
if params[:study][:uploaded_data].present?
Document.create!(documentable: @study, uploaded_data: params[:study][:uploaded_data])
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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
Admin::StudiesController#filter has approx 9 statements Open
def filter # 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.)
Admin::StudiesController#managed_update has approx 13 statements Open
def managed_update # 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.)
Method filter
has a Cognitive Complexity of 8 (exceeds 5 allowed). Consider refactoring. Open
def filter # rubocop:todo Metrics/CyclomaticComplexity
filter_conditions = { approved: false } if params[:filter][:by] == 'not approved' unless params[:filter].nil?
if params[:filter][:by] == 'not approved' || params[:filter][:by] == 'all'
@studies = Study.where(filter_conditions).alphabetical.select { |p| p.name.include? params[:q] }
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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
Method managed_update
has a Cognitive Complexity of 8 (exceeds 5 allowed). Consider refactoring. Open
def managed_update # rubocop:todo Metrics/AbcSize, Metrics/MethodLength
@study = Study.find(params[:id])
if params[:study][:uploaded_data].present?
Document.create!(documentable: @study, uploaded_data: params[:study][:uploaded_data])
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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
Admin::StudiesController tests '@study.warnings.present?' at least 3 times Open
flash.now[:warning] = @study.warnings if @study.warnings.present?
end
def edit
@request_types = RequestType.order(name: :asc)
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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.
Admin::StudiesController#edit calls 'params[:id]' 2 times Open
if params[:id] != '0'
@study = Study.find(params[:id])
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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.
Admin::StudiesController#show calls '@study.warnings' 2 times Open
flash.now[:warning] = @study.warnings if @study.warnings.present?
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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.
Admin::StudiesController#filter calls 'params[:q]' 2 times Open
@studies = Study.where(filter_conditions).alphabetical.select { |p| p.name.include? params[:q] }
end
unless params[:filter].nil?
if params[:filter][:by] == 'unallocated manager'
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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.
Admin::StudiesController#filter calls 'params[:filter][:by] == 'not approved'' 2 times Open
filter_conditions = { approved: false } if params[:filter][:by] == 'not approved' unless params[:filter].nil?
if params[:filter][:by] == 'not approved' || params[:filter][:by] == 'all'
- 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.
Admin::StudiesController#managed_update calls '@study.id' 2 times Open
redirect_to controller: 'admin/studies', action: 'update', id: @study.id
end
rescue ActiveRecord::RecordInvalid => e
errors = @study.errors.full_messages
logger.warn "Failed to update attributes: #{errors}}"
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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.
Admin::StudiesController#filter calls 'params[:filter]' 7 times Open
filter_conditions = { approved: false } if params[:filter][:by] == 'not approved' unless params[:filter].nil?
if params[:filter][:by] == 'not approved' || params[:filter][:by] == 'all'
@studies = Study.where(filter_conditions).alphabetical.select { |p| p.name.include? params[:q] }
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.
Admin::StudiesController#filter calls 'p.name.include? params[:q]' 2 times Open
@studies = Study.where(filter_conditions).alphabetical.select { |p| p.name.include? params[:q] }
end
unless params[:filter].nil?
if params[:filter][:by] == 'unallocated manager'
- 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.
Admin::StudiesController#filter calls 'params[:filter][:by]' 4 times Open
filter_conditions = { approved: false } if params[:filter][:by] == 'not approved' unless params[:filter].nil?
if params[:filter][:by] == 'not approved' || params[:filter][:by] == 'all'
@studies = Study.where(filter_conditions).alphabetical.select { |p| p.name.include? params[:q] }
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.
Admin::StudiesController#filter calls 'params[:filter].nil?' 2 times Open
filter_conditions = { approved: false } if params[:filter][:by] == 'not approved' unless params[:filter].nil?
if params[:filter][:by] == 'not approved' || params[:filter][:by] == 'all'
@studies = Study.where(filter_conditions).alphabetical.select { |p| p.name.include? params[:q] }
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.
Admin::StudiesController#filter calls 'p.name' 2 times Open
@studies = Study.where(filter_conditions).alphabetical.select { |p| p.name.include? params[:q] }
end
unless params[:filter].nil?
if params[:filter][:by] == 'unallocated manager'
- 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.
Admin::StudiesController#edit calls '@study.warnings' 2 times Open
flash.now[:warning] = @study.warnings if @study.warnings.present?
- 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.
Admin::StudiesController#managed_update calls 'params[:study][:uploaded_data]' 2 times Open
if params[:study][:uploaded_data].present?
Document.create!(documentable: @study, uploaded_data: params[:study][:uploaded_data])
- 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.
Admin::StudiesController#update calls 'flash.now' 2 times Open
flash.now[:warning] = @study.warnings if @study.warnings.present?
flash.now[:notice] = 'Your study has been updated'
- 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.
Admin::StudiesController#managed_update calls 'params[:study]' 5 times Open
if params[:study][:uploaded_data].present?
Document.create!(documentable: @study, uploaded_data: params[:study][:uploaded_data])
end
params[:study].delete(:uploaded_data)
- 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.
Admin::StudiesController#update calls '@study.warnings' 2 times Open
flash.now[:warning] = @study.warnings if @study.warnings.present?
- 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.
Admin::StudiesController#filter performs a nil-check Open
filter_conditions = { approved: false } if params[:filter][:by] == 'not approved' unless params[:filter].nil?
if params[:filter][:by] == 'not approved' || params[:filter][:by] == 'all'
@studies = Study.where(filter_conditions).alphabetical.select { |p| p.name.include? params[:q] }
end
- Read upRead up
- Exclude checks
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)
Admin::StudiesController#managed_update has the variable name 'e' Open
rescue ActiveRecord::RecordInvalid => e
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- Exclude checks
An Uncommunicative Variable Name
is a variable name that doesn't communicate its intent well enough.
Poor names make it hard for the reader to build a mental picture of what's going on in the code. They can also be mis-interpreted; and they hurt the flow of reading, because the reader must slow down to interpret the names.
Admin::StudiesController#filter has the variable name 'p' Open
@studies = Study.where(filter_conditions).alphabetical.select { |p| p.name.include? params[:q] }
end
unless params[:filter].nil?
if params[:filter][:by] == 'unallocated manager'
- Read upRead up
- Exclude checks
An Uncommunicative Variable Name
is a variable name that doesn't communicate its intent well enough.
Poor names make it hard for the reader to build a mental picture of what's going on in the code. They can also be mis-interpreted; and they hurt the flow of reading, because the reader must slow down to interpret the names.
TODO found Open
# TODO: remove unneeded code
- Exclude checks
Similar blocks of code found in 2 locations. Consider refactoring. Open
def sort
@studies = Study.all.sort_by(&:name)
case params[:sort]
when 'date'
@studies = @studies.sort_by(&:created_at)
- Read upRead up
Duplicated Code
Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:
Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.
When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).
Tuning
This issue has a mass of 32.
We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.
The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.
If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.
See codeclimate-duplication
's documentation for more information about tuning the mass threshold in your .codeclimate.yml
.
Refactorings
- Extract Method
- Extract Class
- Form Template Method
- Introduce Null Object
- Pull Up Method
- Pull Up Field
- Substitute Algorithm
Further Reading
- Don't Repeat Yourself on the C2 Wiki
- Duplicated Code on SourceMaking
- Refactoring: Improving the Design of Existing Code by Martin Fowler. Duplicated Code, p76