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Checks if the length of a class exceeds some maximum value. Comment lines can optionally be ignored. The maximum allowed length is configurable.

You can set constructs you want to fold with CountAsOne. Available are: 'array', 'hash', 'heredoc', and 'method_call'. Each construct will be counted as one line regardless of its actual size.

Example: CountAsOne: ['array', 'heredoc', 'method_call']

class Foo
  ARRAY = [         # +1
    1,
    2
  ]

  HASH = {          # +3
    key: 'value'
  }

  MSG = <<~HEREDOC  # +1
    Heredoc
    content.
  HEREDOC

  foo(              # +1
    1,
    2
  )
end                 # 6 points

NOTE: This cop also applies for Struct definitions.

This cop checks for consistent uses of request.referer or request.referrer, depending on the cop's configuration.

Example: EnforcedStyle: referer (default)

# bad
request.referrer

# good
request.referer

Example: EnforcedStyle: referrer

# bad
request.referer

# good
request.referrer

Checks for assignments in the conditions of if/while/until.

AllowSafeAssignment option for safe assignment. By safe assignment we mean putting parentheses around an assignment to indicate "I know I'm using an assignment as a condition. It's not a mistake."

Safety:

This cop's autocorrection is unsafe because it assumes that the author meant to use an assignment result as a condition.

Example:

# bad
if some_var = true
  do_something
end

# good
if some_var == true
  do_something
end

Example: AllowSafeAssignment: true (default)

# good
if (some_var = true)
  do_something
end

Example: AllowSafeAssignment: false

# bad
if (some_var = true)
  do_something
end

Checks that predicate methods names end with a question mark and do not start with a forbidden prefix.

A method is determined to be a predicate method if its name starts with one of the prefixes defined in the NamePrefix configuration. You can change what prefixes are considered by changing this option. Any method name that starts with one of these prefixes is required by the cop to end with a ?. Other methods can be allowed by adding to the AllowedMethods configuration.

NOTE: The is_a? method is allowed by default.

If ForbiddenPrefixes is set, methods that start with the configured prefixes will not be allowed and will be removed by autocorrection.

In other words, if ForbiddenPrefixes is empty, a method named is_foo will register an offense only due to the lack of question mark (and will be autocorrected to is_foo?). If ForbiddenPrefixes contains is_, is_foo will register an offense both because the ? is missing and because of the is_ prefix, and will be corrected to foo?.

NOTE: ForbiddenPrefixes is only applied to prefixes in NamePrefix; a prefix in the former but not the latter will not be considered by this cop.

Example:

# bad
def is_even(value)
end

def is_even?(value)
end

# good
def even?(value)
end

# bad
def has_value
end

def has_value?
end

# good
def value?
end

Example: AllowedMethods: ['is_a?'] (default)

# good
def is_a?(value)
end

If the branch of a conditional consists solely of a conditional node, its conditions can be combined with the conditions of the outer branch. This helps to keep the nesting level from getting too deep.

Example:

# bad
if condition_a
  if condition_b
    do_something
  end
end

# bad
if condition_b
  do_something
end if condition_a

# good
if condition_a && condition_b
  do_something
end

Example: AllowModifier: false (default)

# bad
if condition_a
  do_something if condition_b
end

# bad
if condition_b
  do_something
end if condition_a

Example: AllowModifier: true

# good
if condition_a
  do_something if condition_b
end

# good
if condition_b
  do_something
end if condition_a

Checks that predicate methods names end with a question mark and do not start with a forbidden prefix.

A method is determined to be a predicate method if its name starts with one of the prefixes defined in the NamePrefix configuration. You can change what prefixes are considered by changing this option. Any method name that starts with one of these prefixes is required by the cop to end with a ?. Other methods can be allowed by adding to the AllowedMethods configuration.

NOTE: The is_a? method is allowed by default.

If ForbiddenPrefixes is set, methods that start with the configured prefixes will not be allowed and will be removed by autocorrection.

In other words, if ForbiddenPrefixes is empty, a method named is_foo will register an offense only due to the lack of question mark (and will be autocorrected to is_foo?). If ForbiddenPrefixes contains is_, is_foo will register an offense both because the ? is missing and because of the is_ prefix, and will be corrected to foo?.

NOTE: ForbiddenPrefixes is only applied to prefixes in NamePrefix; a prefix in the former but not the latter will not be considered by this cop.

Example:

# bad
def is_even(value)
end

def is_even?(value)
end

# good
def even?(value)
end

# bad
def has_value
end

def has_value?
end

# good
def value?
end

Example: AllowedMethods: ['is_a?'] (default)

# good
def is_a?(value)
end