ikuseiGmbH/smart-village-app-cms

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 53.

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

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 53.

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

Advisory: CVE-2023-22795

URL: https://github.com/rails/rails/releases/tag/v7.0.4.1

Solution: upgrade to >= 5.2.8.15, ~> 5.2.8, >= 6.1.7.1, ~> 6.1.7, >= 7.0.4.1

Advisory: CVE-2022-23476

Criticality: High

URL: https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-qv4q-mr5r-qprj

Solution: upgrade to >= 1.13.10

Advisory: CVE-2019-11358

Criticality: Medium

URL: https://blog.jquery.com/2019/04/10/jquery-3-4-0-released/

Solution: upgrade to >= 4.3.4

Advisory: CVE-2023-22794

URL: https://github.com/rails/rails/releases/tag/v7.0.4.1

Solution: upgrade to >= 6.0.6.1, ~> 6.0.6, >= 6.1.7.1, ~> 6.1.7, >= 7.0.4.1

Advisory: CVE-2023-22792

URL: https://github.com/rails/rails/releases/tag/v7.0.4.1

Solution: upgrade to >= 5.2.8.15, ~> 5.2.8, >= 6.1.7.1, ~> 6.1.7, >= 7.0.4.1

Advisory: CVE-2022-22577

Criticality: Medium

URL: https://groups.google.com/g/ruby-security-ann/c/NuFRKaN5swI

Solution: upgrade to >= 5.2.7.1, ~> 5.2.7, >= 6.0.4.8, ~> 6.0.4, >= 6.1.5.1, ~> 6.1.5, >= 7.0.2.4

Advisory: CVE-2022-27777

Criticality: Medium

URL: https://groups.google.com/g/ruby-security-ann/c/9wJPEDv-iRw

Solution: upgrade to >= 5.2.7.1, ~> 5.2.7, >= 6.0.4.8, ~> 6.0.4, >= 6.1.5.1, ~> 6.1.5, >= 7.0.2.4

Advisory: CVE-2022-44566

URL: https://github.com/rails/rails/releases/tag/v7.0.4.1

Solution: upgrade to >= 5.2.8.15, ~> 5.2.8, >= 6.1.7.1, ~> 6.1.7, >= 7.0.4.1

Advisory: CVE-2022-32224

Criticality: Critical

URL: https://groups.google.com/g/rubyonrails-security/c/MmFO3LYQE8U

Solution: upgrade to >= 5.2.8.1, ~> 5.2.8, >= 6.0.5.1, ~> 6.0.5, >= 6.1.6.1, ~> 6.1.6, >= 7.0.3.1

Advisory: CVE-2023-22796

URL: https://github.com/rails/rails/releases/tag/v7.0.4.1

Solution: upgrade to >= 5.2.8.15, ~> 5.2.8, >= 6.1.7.1, ~> 6.1.7, >= 7.0.4.1

Boolean Parameter is a special case of Control Couple, where a method parameter is defaulted to true or false. A Boolean Parameter effectively permits a method's caller to decide which execution path to take. This is a case of bad cohesion. You're creating a dependency between methods that is not really necessary, thus increasing coupling.

Example

Given

class Dummy
  def hit_the_switch(switch = true)
    if switch
      puts 'Hitting the switch'
      # do other things...
    else
      puts 'Not hitting the switch'
      # do other things...
    end
  end
end

Reek would emit the following warning:

test.rb -- 3 warnings:
  [1]:Dummy#hit_the_switch has boolean parameter 'switch' (BooleanParameter)
  [2]:Dummy#hit_the_switch is controlled by argument switch (ControlParameter)

Note that both smells are reported, Boolean Parameter and Control Parameter.

Getting rid of the smell

This is highly dependent on your exact architecture, but looking at the example above what you could do is:

• Move everything in the if branch into a separate method
• Move everything in the else branch into a separate method
• Get rid of the hit_the_switch method alltogether
• Make the decision what method to call in the initial caller of hit_the_switch

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.)

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.)

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)

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)

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.)

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)

Boolean Parameter is a special case of Control Couple, where a method parameter is defaulted to true or false. A Boolean Parameter effectively permits a method's caller to decide which execution path to take. This is a case of bad cohesion. You're creating a dependency between methods that is not really necessary, thus increasing coupling.

Example

Given

class Dummy
  def hit_the_switch(switch = true)
    if switch
      puts 'Hitting the switch'
      # do other things...
    else
      puts 'Not hitting the switch'
      # do other things...
    end
  end
end

Reek would emit the following warning:

test.rb -- 3 warnings:
  [1]:Dummy#hit_the_switch has boolean parameter 'switch' (BooleanParameter)
  [2]:Dummy#hit_the_switch is controlled by argument switch (ControlParameter)

Note that both smells are reported, Boolean Parameter and Control Parameter.

Getting rid of the smell

This is highly dependent on your exact architecture, but looking at the example above what you could do is:

• Move everything in the if branch into a separate method
• Move everything in the else branch into a separate method
• Get rid of the hit_the_switch method alltogether
• Make the decision what method to call in the initial caller of hit_the_switch