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Prefer each over for.
Open

    for i in 0..3
Severity: Minor
Found in app/models/multiple_choice_checkbox.rb by rubocop

This cop looks for uses of the for keyword, or each method. The preferred alternative is set in the EnforcedStyle configuration parameter. An each call with a block on a single line is always allowed, however.

Tagging a string as html safe may be a security risk.
Open

    safe_join(["<TR>".html_safe, "</TR>".html_safe], html.html_safe)
Severity: Minor
Found in app/models/criterion.rb by rubocop

This cop checks for the use of output safety calls like htmlsafe, raw, and safeconcat. These methods do not escape content. They simply return a SafeBuffer containing the content as is. Instead, use safe_join to join content and escape it and concat to concatenate content and escape it, ensuring its safety.

Example:

user_content = "hi"

# bad
"
#{user_content}
".html_safe
# => ActiveSupport::SafeBuffer "
hi
"

# good
content_tag(:p, user_content)
# => ActiveSupport::SafeBuffer "
<b>hi</b>
"

# bad
out = ""
out << "
  • #{user_content}
    • "
out << "
  • #{user_content}
    • "
out.html_safe
# => ActiveSupport::SafeBuffer "
  • hi
    • 

  • hi
    • "

# good
out = []
out << content_tag(:li, user_content)
out << content_tag(:li, user_content)
safe_join(out)
# => ActiveSupport::SafeBuffer
#    "
  • <b>hi</b>
    • 

  • <b>hi</b>
    • "

# bad
out = "
    trusted content
    ".html_safe
out.safe_concat(user_content)
# => ActiveSupport::SafeBuffer "
    trusted_content
    
hi"

# good
out = "
    trusted content
    ".html_safe
out.concat(user_content)
# => ActiveSupport::SafeBuffer
#    "
    trusted_content
    <b>hi</b>"

# safe, though maybe not good style
out = "trusted content"
result = out.concat(user_content)
# => String "trusted contenthi"
# because when rendered in ERB the String will be escaped:
# <%= result %>
# => trusted content<b>hi</b>

# bad
(user_content + " " + content_tag(:span, user_content)).html_safe
# => ActiveSupport::SafeBuffer "hi <span><b>hi</b></span>"

# good
safe_join([user_content, " ", content_tag(:span, user_content)])
# => ActiveSupport::SafeBuffer
#    "<b>hi</b> <span>&lt;b&gt;hi&lt;/b&gt;</span>"

    Specify an :inverse_of option.
    Open

      belongs_to :assignment, class_name: 'Assignment', foreign_key: 'parent_id'
    Severity: Minor
    Found in app/models/assignment_due_date.rb by rubocop

    This cop looks for has(one|many) and belongsto associations where ActiveRecord can't automatically determine the inverse association because of a scope or the options used. This can result in unnecessary queries in some circumstances. :inverse_of must be manually specified for associations to work in both ways, or set to false to opt-out.

    Example:

    # good
class Blog < ApplicationRecord
  has_many :posts
end

class Post < ApplicationRecord
  belongs_to :blog
end

    Example:

    # bad
class Blog < ApplicationRecord
  has_many :posts, -> { order(published_at: :desc) }
end

class Post < ApplicationRecord
  belongs_to :blog
end

# good
class Blog < ApplicationRecord
  has_many(:posts,
    -> { order(published_at: :desc) },
    inverse_of: :blog
  )
end

class Post < ApplicationRecord
  belongs_to :blog
end

# good
class Blog < ApplicationRecord
  with_options inverse_of: :blog do
    has_many :posts, -> { order(published_at: :desc) }
  end
end

class Post < ApplicationRecord
  belongs_to :blog
end

    Example:

    # bad
class Picture < ApplicationRecord
  belongs_to :imageable, polymorphic: true
end

class Employee < ApplicationRecord
  has_many :pictures, as: :imageable
end

class Product < ApplicationRecord
  has_many :pictures, as: :imageable
end

# good
class Picture < ApplicationRecord
  belongs_to :imageable, polymorphic: true
end

class Employee < ApplicationRecord
  has_many :pictures, as: :imageable, inverse_of: :imageable
end

class Product < ApplicationRecord
  has_many :pictures, as: :imageable, inverse_of: :imageable
end

    Example:

    # bad
# However, RuboCop can not detect this pattern...
class Physician < ApplicationRecord
  has_many :appointments
  has_many :patients, through: :appointments
end

class Appointment < ApplicationRecord
  belongs_to :physician
  belongs_to :patient
end

class Patient < ApplicationRecord
  has_many :appointments
  has_many :physicians, through: :appointments
end

# good
class Physician < ApplicationRecord
  has_many :appointments
  has_many :patients, through: :appointments
end

class Appointment < ApplicationRecord
  belongs_to :physician, inverse_of: :appointments
  belongs_to :patient, inverse_of: :appointments
end

class Patient < ApplicationRecord
  has_many :appointments
  has_many :physicians, through: :appointments
end

    @see http://guides.rubyonrails.org/association_basics.html#bi-directional-associations @see http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html#module-ActiveRecord::Associations::ClassMethods-label-Setting+Inverses

    Tagging a string as html safe may be a security risk.
    Open

          html += '<br>' + answer.comments.html_safe
    Severity: Minor
    Found in app/models/criterion.rb by rubocop

    This cop checks for the use of output safety calls like htmlsafe, raw, and safeconcat. These methods do not escape content. They simply return a SafeBuffer containing the content as is. Instead, use safe_join to join content and escape it and concat to concatenate content and escape it, ensuring its safety.

    Example:

    user_content = "hi"

# bad
"
    #{user_content}
    ".html_safe
# => ActiveSupport::SafeBuffer "
    hi
    "

# good
content_tag(:p, user_content)
# => ActiveSupport::SafeBuffer "
    <b>hi</b>
    "

# bad
out = ""
out << "
  • #{user_content}
    • "
out << "
  • #{user_content}
    • "
out.html_safe
# => ActiveSupport::SafeBuffer "
  • hi
    • 

  • hi
    • "

# good
out = []
out << content_tag(:li, user_content)
out << content_tag(:li, user_content)
safe_join(out)
# => ActiveSupport::SafeBuffer
#    "
  • <b>hi</b>
    • 

  • <b>hi</b>
    • "

# bad
out = "
    trusted content
    ".html_safe
out.safe_concat(user_content)
# => ActiveSupport::SafeBuffer "
    trusted_content
    
hi"

# good
out = "
    trusted content
    ".html_safe
out.concat(user_content)
# => ActiveSupport::SafeBuffer
#    "
    trusted_content
    <b>hi</b>"

# safe, though maybe not good style
out = "trusted content"
result = out.concat(user_content)
# => String "trusted contenthi"
# because when rendered in ERB the String will be escaped:
# <%= result %>
# => trusted content<b>hi</b>

# bad
(user_content + " " + content_tag(:span, user_content)).html_safe
# => ActiveSupport::SafeBuffer "hi <span><b>hi</b></span>"

# good
safe_join([user_content, " ", content_tag(:span, user_content)])
# => ActiveSupport::SafeBuffer
#    "<b>hi</b> <span>&lt;b&gt;hi&lt;/b&gt;</span>"

    Avoid more than 3 levels of block nesting.
    Open

                if assignment_due_date.due_at >= Time.zone.now
              next_due_date = assignment_due_date
              break
            end
    Severity: Minor
    Found in app/models/due_date.rb by rubocop

    This cop checks for excessive nesting of conditional and looping constructs.

    You can configure if blocks are considered using the CountBlocks option. When set to false (the default) blocks are not counted towards the nesting level. Set to true to count blocks as well.

    The maximum level of nesting allowed is configurable.

    Specify an :inverse_of option.
    Open

      has_many :participants, class_name: 'Participant', foreign_key: 'user_id', dependent: :destroy
    Severity: Minor
    Found in app/models/user.rb by rubocop

    This cop looks for has(one|many) and belongsto associations where ActiveRecord can't automatically determine the inverse association because of a scope or the options used. This can result in unnecessary queries in some circumstances. :inverse_of must be manually specified for associations to work in both ways, or set to false to opt-out.

    Example:

    # good
class Blog < ApplicationRecord
  has_many :posts
end

class Post < ApplicationRecord
  belongs_to :blog
end

    Example:

    # bad
class Blog < ApplicationRecord
  has_many :posts, -> { order(published_at: :desc) }
end

class Post < ApplicationRecord
  belongs_to :blog
end

# good
class Blog < ApplicationRecord
  has_many(:posts,
    -> { order(published_at: :desc) },
    inverse_of: :blog
  )
end

class Post < ApplicationRecord
  belongs_to :blog
end

# good
class Blog < ApplicationRecord
  with_options inverse_of: :blog do
    has_many :posts, -> { order(published_at: :desc) }
  end
end

class Post < ApplicationRecord
  belongs_to :blog
end

    Example:

    # bad
class Picture < ApplicationRecord
  belongs_to :imageable, polymorphic: true
end

class Employee < ApplicationRecord
  has_many :pictures, as: :imageable
end

class Product < ApplicationRecord
  has_many :pictures, as: :imageable
end

# good
class Picture < ApplicationRecord
  belongs_to :imageable, polymorphic: true
end

class Employee < ApplicationRecord
  has_many :pictures, as: :imageable, inverse_of: :imageable
end

class Product < ApplicationRecord
  has_many :pictures, as: :imageable, inverse_of: :imageable
end

    Example:

    # bad
# However, RuboCop can not detect this pattern...
class Physician < ApplicationRecord
  has_many :appointments
  has_many :patients, through: :appointments
end

class Appointment < ApplicationRecord
  belongs_to :physician
  belongs_to :patient
end

class Patient < ApplicationRecord
  has_many :appointments
  has_many :physicians, through: :appointments
end

# good
class Physician < ApplicationRecord
  has_many :appointments
  has_many :patients, through: :appointments
end

class Appointment < ApplicationRecord
  belongs_to :physician, inverse_of: :appointments
  belongs_to :patient, inverse_of: :appointments
end

class Patient < ApplicationRecord
  has_many :appointments
  has_many :physicians, through: :appointments
end

    @see http://guides.rubyonrails.org/association_basics.html#bi-directional-associations @see http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html#module-ActiveRecord::Associations::ClassMethods-label-Setting+Inverses

    Specify an :inverse_of option.
    Open

      belongs_to :response_map, class_name: 'ResponseMap', foreign_key: 'map_id'
    Severity: Minor
    Found in app/models/response.rb by rubocop

    This cop looks for has(one|many) and belongsto associations where ActiveRecord can't automatically determine the inverse association because of a scope or the options used. This can result in unnecessary queries in some circumstances. :inverse_of must be manually specified for associations to work in both ways, or set to false to opt-out.

    Example:

    # good
class Blog < ApplicationRecord
  has_many :posts
end

class Post < ApplicationRecord
  belongs_to :blog
end

    Example:

    # bad
class Blog < ApplicationRecord
  has_many :posts, -> { order(published_at: :desc) }
end

class Post < ApplicationRecord
  belongs_to :blog
end

# good
class Blog < ApplicationRecord
  has_many(:posts,
    -> { order(published_at: :desc) },
    inverse_of: :blog
  )
end

class Post < ApplicationRecord
  belongs_to :blog
end

# good
class Blog < ApplicationRecord
  with_options inverse_of: :blog do
    has_many :posts, -> { order(published_at: :desc) }
  end
end

class Post < ApplicationRecord
  belongs_to :blog
end

    Example:

    # bad
class Picture < ApplicationRecord
  belongs_to :imageable, polymorphic: true
end

class Employee < ApplicationRecord
  has_many :pictures, as: :imageable
end

class Product < ApplicationRecord
  has_many :pictures, as: :imageable
end

# good
class Picture < ApplicationRecord
  belongs_to :imageable, polymorphic: true
end

class Employee < ApplicationRecord
  has_many :pictures, as: :imageable, inverse_of: :imageable
end

class Product < ApplicationRecord
  has_many :pictures, as: :imageable, inverse_of: :imageable
end

    Example:

    # bad
# However, RuboCop can not detect this pattern...
class Physician < ApplicationRecord
  has_many :appointments
  has_many :patients, through: :appointments
end

class Appointment < ApplicationRecord
  belongs_to :physician
  belongs_to :patient
end

class Patient < ApplicationRecord
  has_many :appointments
  has_many :physicians, through: :appointments
end

# good
class Physician < ApplicationRecord
  has_many :appointments
  has_many :patients, through: :appointments
end

class Appointment < ApplicationRecord
  belongs_to :physician, inverse_of: :appointments
  belongs_to :patient, inverse_of: :appointments
end

class Patient < ApplicationRecord
  has_many :appointments
  has_many :physicians, through: :appointments
end

    @see http://guides.rubyonrails.org/association_basics.html#bi-directional-associations @see http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html#module-ActiveRecord::Associations::ClassMethods-label-Setting+Inverses

    Use find_by instead of where.first.
    Open

          score = Answer.where(response_id: response_id, question_id: question.id).first
    Severity: Minor
    Found in app/models/quiz_response_map.rb by rubocop

    This cop is used to identify usages of where.first and change them to use find_by instead.

    Example:

    # bad
User.where(name: 'Bruce').first
User.where(name: 'Bruce').take

# good
User.find_by(name: 'Bruce')

    Use a guard clause instead of wrapping the code inside a conditional expression.
    Open

            if ap1.reviews_by_reviewer(ap2).nil?
    Severity: Minor
    Found in app/models/collusion_cycle.rb by rubocop

    Use a guard clause instead of wrapping the code inside a conditional expression

    Example:

    # bad
def test
  if something
    work
  end
end

# good
def test
  return unless something
  work
end

# also good
def test
  work if something
end

# bad
if something
  raise 'exception'
else
  ok
end

# good
raise 'exception' if something
ok

    Specify an :inverse_of option.
    Open

      has_many :assignment_participants, class_name: 'AssignmentParticipant', foreign_key: 'user_id', dependent: :destroy
    Severity: Minor
    Found in app/models/user.rb by rubocop

    This cop looks for has(one|many) and belongsto associations where ActiveRecord can't automatically determine the inverse association because of a scope or the options used. This can result in unnecessary queries in some circumstances. :inverse_of must be manually specified for associations to work in both ways, or set to false to opt-out.

    Example:

    # good
class Blog < ApplicationRecord
  has_many :posts
end

class Post < ApplicationRecord
  belongs_to :blog
end

    Example:

    # bad
class Blog < ApplicationRecord
  has_many :posts, -> { order(published_at: :desc) }
end

class Post < ApplicationRecord
  belongs_to :blog
end

# good
class Blog < ApplicationRecord
  has_many(:posts,
    -> { order(published_at: :desc) },
    inverse_of: :blog
  )
end

class Post < ApplicationRecord
  belongs_to :blog
end

# good
class Blog < ApplicationRecord
  with_options inverse_of: :blog do
    has_many :posts, -> { order(published_at: :desc) }
  end
end

class Post < ApplicationRecord
  belongs_to :blog
end

    Example:

    # bad
class Picture < ApplicationRecord
  belongs_to :imageable, polymorphic: true
end

class Employee < ApplicationRecord
  has_many :pictures, as: :imageable
end

class Product < ApplicationRecord
  has_many :pictures, as: :imageable
end

# good
class Picture < ApplicationRecord
  belongs_to :imageable, polymorphic: true
end

class Employee < ApplicationRecord
  has_many :pictures, as: :imageable, inverse_of: :imageable
end

class Product < ApplicationRecord
  has_many :pictures, as: :imageable, inverse_of: :imageable
end

    Example:

    # bad
# However, RuboCop can not detect this pattern...
class Physician < ApplicationRecord
  has_many :appointments
  has_many :patients, through: :appointments
end

class Appointment < ApplicationRecord
  belongs_to :physician
  belongs_to :patient
end

class Patient < ApplicationRecord
  has_many :appointments
  has_many :physicians, through: :appointments
end

# good
class Physician < ApplicationRecord
  has_many :appointments
  has_many :patients, through: :appointments
end

class Appointment < ApplicationRecord
  belongs_to :physician, inverse_of: :appointments
  belongs_to :patient, inverse_of: :appointments
end

class Patient < ApplicationRecord
  has_many :appointments
  has_many :physicians, through: :appointments
end

    @see http://guides.rubyonrails.org/association_basics.html#bi-directional-associations @see http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html#module-ActiveRecord::Associations::ClassMethods-label-Setting+Inverses

    Tagging a string as html safe may be a security risk.
    Open

        safe_join(["".html_safe, "".html_safe], html.html_safe)
    Severity: Minor
    Found in app/models/checkbox.rb by rubocop

    This cop checks for the use of output safety calls like htmlsafe, raw, and safeconcat. These methods do not escape content. They simply return a SafeBuffer containing the content as is. Instead, use safe_join to join content and escape it and concat to concatenate content and escape it, ensuring its safety.

    Example:

    user_content = "hi"

# bad
"
    #{user_content}
    ".html_safe
# => ActiveSupport::SafeBuffer "
    hi
    "

# good
content_tag(:p, user_content)
# => ActiveSupport::SafeBuffer "
    <b>hi</b>
    "

# bad
out = ""
out << "
  • #{user_content}
    • "
out << "
  • #{user_content}
    • "
out.html_safe
# => ActiveSupport::SafeBuffer "
  • hi
    • 

  • hi
    • "

# good
out = []
out << content_tag(:li, user_content)
out << content_tag(:li, user_content)
safe_join(out)
# => ActiveSupport::SafeBuffer
#    "
  • <b>hi</b>
    • 

  • <b>hi</b>
    • "

# bad
out = "
    trusted content
    ".html_safe
out.safe_concat(user_content)
# => ActiveSupport::SafeBuffer "
    trusted_content
    
hi"

# good
out = "
    trusted content
    ".html_safe
out.concat(user_content)
# => ActiveSupport::SafeBuffer
#    "
    trusted_content
    <b>hi</b>"

# safe, though maybe not good style
out = "trusted content"
result = out.concat(user_content)
# => String "trusted contenthi"
# because when rendered in ERB the String will be escaped:
# <%= result %>
# => trusted content<b>hi</b>

# bad
(user_content + " " + content_tag(:span, user_content)).html_safe
# => ActiveSupport::SafeBuffer "hi <span><b>hi</b></span>"

# good
safe_join([user_content, " ", content_tag(:span, user_content)])
# => ActiveSupport::SafeBuffer
#    "<b>hi</b> <span>&lt;b&gt;hi&lt;/b&gt;</span>"

    Tagging a string as html safe may be a security risk.
    Open

        safe_join(["".html_safe, "".html_safe], html.html_safe)
    Severity: Minor
    Found in app/models/checkbox.rb by rubocop

    This cop checks for the use of output safety calls like htmlsafe, raw, and safeconcat. These methods do not escape content. They simply return a SafeBuffer containing the content as is. Instead, use safe_join to join content and escape it and concat to concatenate content and escape it, ensuring its safety.

    Example:

    user_content = "hi"

# bad
"
    #{user_content}
    ".html_safe
# => ActiveSupport::SafeBuffer "
    hi
    "

# good
content_tag(:p, user_content)
# => ActiveSupport::SafeBuffer "
    <b>hi</b>
    "

# bad
out = ""
out << "
  • #{user_content}
    • "
out << "
  • #{user_content}
    • "
out.html_safe
# => ActiveSupport::SafeBuffer "
  • hi
    • 

  • hi
    • "

# good
out = []
out << content_tag(:li, user_content)
out << content_tag(:li, user_content)
safe_join(out)
# => ActiveSupport::SafeBuffer
#    "
  • <b>hi</b>
    • 

  • <b>hi</b>
    • "

# bad
out = "
    trusted content
    ".html_safe
out.safe_concat(user_content)
# => ActiveSupport::SafeBuffer "
    trusted_content
    
hi"

# good
out = "
    trusted content
    ".html_safe
out.concat(user_content)
# => ActiveSupport::SafeBuffer
#    "
    trusted_content
    <b>hi</b>"

# safe, though maybe not good style
out = "trusted content"
result = out.concat(user_content)
# => String "trusted contenthi"
# because when rendered in ERB the String will be escaped:
# <%= result %>
# => trusted content<b>hi</b>

# bad
(user_content + " " + content_tag(:span, user_content)).html_safe
# => ActiveSupport::SafeBuffer "hi <span><b>hi</b></span>"

# good
safe_join([user_content, " ", content_tag(:span, user_content)])
# => ActiveSupport::SafeBuffer
#    "<b>hi</b> <span>&lt;b&gt;hi&lt;/b&gt;</span>"

    Tagging a string as html safe may be a security risk.
    Open

        safe_join(["".html_safe, "".html_safe], html.html_safe)
    Severity: Minor
    Found in app/models/checkbox.rb by rubocop

    This cop checks for the use of output safety calls like htmlsafe, raw, and safeconcat. These methods do not escape content. They simply return a SafeBuffer containing the content as is. Instead, use safe_join to join content and escape it and concat to concatenate content and escape it, ensuring its safety.

    Example:

    user_content = "hi"

# bad
"
    #{user_content}
    ".html_safe
# => ActiveSupport::SafeBuffer "
    hi
    "

# good
content_tag(:p, user_content)
# => ActiveSupport::SafeBuffer "
    <b>hi</b>
    "

# bad
out = ""
out << "
  • #{user_content}
    • "
out << "
  • #{user_content}
    • "
out.html_safe
# => ActiveSupport::SafeBuffer "
  • hi
    • 

  • hi
    • "

# good
out = []
out << content_tag(:li, user_content)
out << content_tag(:li, user_content)
safe_join(out)
# => ActiveSupport::SafeBuffer
#    "
  • <b>hi</b>
    • 

  • <b>hi</b>
    • "

# bad
out = "
    trusted content
    ".html_safe
out.safe_concat(user_content)
# => ActiveSupport::SafeBuffer "
    trusted_content
    
hi"

# good
out = "
    trusted content
    ".html_safe
out.concat(user_content)
# => ActiveSupport::SafeBuffer
#    "
    trusted_content
    <b>hi</b>"

# safe, though maybe not good style
out = "trusted content"
result = out.concat(user_content)
# => String "trusted contenthi"
# because when rendered in ERB the String will be escaped:
# <%= result %>
# => trusted content<b>hi</b>

# bad
(user_content + " " + content_tag(:span, user_content)).html_safe
# => ActiveSupport::SafeBuffer "hi <span><b>hi</b></span>"

# good
safe_join([user_content, " ", content_tag(:span, user_content)])
# => ActiveSupport::SafeBuffer
#    "<b>hi</b> <span>&lt;b&gt;hi&lt;/b&gt;</span>"

    Use a guard clause instead of wrapping the code inside a conditional expression.
    Open

              if ap2.reviews_by_reviewer(ap3).nil?
    Severity: Minor
    Found in app/models/collusion_cycle.rb by rubocop

    Use a guard clause instead of wrapping the code inside a conditional expression

    Example:

    # bad
def test
  if something
    work
  end
end

# good
def test
  return unless something
  work
end

# also good
def test
  work if something
end

# bad
if something
  raise 'exception'
else
  ok
end

# good
raise 'exception' if something
ok

    Specify an :inverse_of option.
    Open

      belongs_to :reviewee, class_name: 'Participant', foreign_key: 'reviewee_id'
    Severity: Minor
    Found in app/models/teammate_review_response_map.rb by rubocop

    This cop looks for has(one|many) and belongsto associations where ActiveRecord can't automatically determine the inverse association because of a scope or the options used. This can result in unnecessary queries in some circumstances. :inverse_of must be manually specified for associations to work in both ways, or set to false to opt-out.

    Example:

    # good
class Blog < ApplicationRecord
  has_many :posts
end

class Post < ApplicationRecord
  belongs_to :blog
end

    Example:

    # bad
class Blog < ApplicationRecord
  has_many :posts, -> { order(published_at: :desc) }
end

class Post < ApplicationRecord
  belongs_to :blog
end

# good
class Blog < ApplicationRecord
  has_many(:posts,
    -> { order(published_at: :desc) },
    inverse_of: :blog
  )
end

class Post < ApplicationRecord
  belongs_to :blog
end

# good
class Blog < ApplicationRecord
  with_options inverse_of: :blog do
    has_many :posts, -> { order(published_at: :desc) }
  end
end

class Post < ApplicationRecord
  belongs_to :blog
end

    Example:

    # bad
class Picture < ApplicationRecord
  belongs_to :imageable, polymorphic: true
end

class Employee < ApplicationRecord
  has_many :pictures, as: :imageable
end

class Product < ApplicationRecord
  has_many :pictures, as: :imageable
end

# good
class Picture < ApplicationRecord
  belongs_to :imageable, polymorphic: true
end

class Employee < ApplicationRecord
  has_many :pictures, as: :imageable, inverse_of: :imageable
end

class Product < ApplicationRecord
  has_many :pictures, as: :imageable, inverse_of: :imageable
end

    Example:

    # bad
# However, RuboCop can not detect this pattern...
class Physician < ApplicationRecord
  has_many :appointments
  has_many :patients, through: :appointments
end

class Appointment < ApplicationRecord
  belongs_to :physician
  belongs_to :patient
end

class Patient < ApplicationRecord
  has_many :appointments
  has_many :physicians, through: :appointments
end

# good
class Physician < ApplicationRecord
  has_many :appointments
  has_many :patients, through: :appointments
end

class Appointment < ApplicationRecord
  belongs_to :physician, inverse_of: :appointments
  belongs_to :patient, inverse_of: :appointments
end

class Patient < ApplicationRecord
  has_many :appointments
  has_many :physicians, through: :appointments
end

    @see http://guides.rubyonrails.org/association_basics.html#bi-directional-associations @see http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html#module-ActiveRecord::Associations::ClassMethods-label-Setting+Inverses

    Use each_value instead of each.
    Open

        choice_info.each do |_idx, value|
    Severity: Minor
    Found in app/models/multiple_choice_checkbox.rb by rubocop

    This cop checks for uses of each_key and each_value Hash methods.

    Note: If you have an array of two-element arrays, you can put parentheses around the block arguments to indicate that you're not working with a hash, and suppress RuboCop offenses.

    Example:

    # bad
hash.keys.each { |k| p k }
hash.values.each { |v| p v }
hash.each { |k, _v| p k }
hash.each { |_k, v| p v }

# good
hash.each_key { |k| p k }
hash.each_value { |v| p v }

    Tagging a string as html safe may be a security risk.
    Open

        safe_join(["".html_safe, "".html_safe], html.html_safe)
    Severity: Minor
    Found in app/models/checkbox.rb by rubocop

    This cop checks for the use of output safety calls like htmlsafe, raw, and safeconcat. These methods do not escape content. They simply return a SafeBuffer containing the content as is. Instead, use safe_join to join content and escape it and concat to concatenate content and escape it, ensuring its safety.

    Example:

    user_content = "hi"

# bad
"
    #{user_content}
    ".html_safe
# => ActiveSupport::SafeBuffer "
    hi
    "

# good
content_tag(:p, user_content)
# => ActiveSupport::SafeBuffer "
    <b>hi</b>
    "

# bad
out = ""
out << "
  • #{user_content}
    • "
out << "
  • #{user_content}
    • "
out.html_safe
# => ActiveSupport::SafeBuffer "
  • hi
    • 

  • hi
    • "

# good
out = []
out << content_tag(:li, user_content)
out << content_tag(:li, user_content)
safe_join(out)
# => ActiveSupport::SafeBuffer
#    "
  • <b>hi</b>
    • 

  • <b>hi</b>
    • "

# bad
out = "
    trusted content
    ".html_safe
out.safe_concat(user_content)
# => ActiveSupport::SafeBuffer "
    trusted_content
    
hi"

# good
out = "
    trusted content
    ".html_safe
out.concat(user_content)
# => ActiveSupport::SafeBuffer
#    "
    trusted_content
    <b>hi</b>"

# safe, though maybe not good style
out = "trusted content"
result = out.concat(user_content)
# => String "trusted contenthi"
# because when rendered in ERB the String will be escaped:
# <%= result %>
# => trusted content<b>hi</b>

# bad
(user_content + " " + content_tag(:span, user_content)).html_safe
# => ActiveSupport::SafeBuffer "hi <span><b>hi</b></span>"

# good
safe_join([user_content, " ", content_tag(:span, user_content)])
# => ActiveSupport::SafeBuffer
#    "<b>hi</b> <span>&lt;b&gt;hi&lt;/b&gt;</span>"

    Specify a :dependent option.
    Open

      has_many :children, class_name: 'User', foreign_key: 'parent_id'
    Severity: Minor
    Found in app/models/user.rb by rubocop

    This cop looks for has_many or has_one associations that don't specify a :dependent option. It doesn't register an offense if :through option was specified.

    Example:

    # bad
class User < ActiveRecord::Base
  has_many :comments
  has_one :avatar
end

# good
class User < ActiveRecord::Base
  has_many :comments, dependent: :restrict_with_exception
  has_one :avatar, dependent: :destroy
  has_many :patients, through: :appointments
end

    Replace class var @@ta_role with a class instance var.
    Open

        @@ta_role ||= find_by name: 'Teaching Assistant'
    Severity: Minor
    Found in app/models/role.rb by rubocop

    This cop checks for uses of class variables. Offenses are signaled only on assignment to class variables to reduce the number of offenses that would be reported.

    Prefer each over for.
    Open

        for pivot in 0...cycle.size - 1 do
    Severity: Minor
    Found in app/models/collusion_cycle.rb by rubocop

    This cop looks for uses of the for keyword, or each method. The preferred alternative is set in the EnforcedStyle configuration parameter. An each call with a block on a single line is always allowed, however.

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