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Class: RuboCop::Cop::Lint::ConstantDefinitionInBlock

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::RuboCop::Cop::Base, ::RuboCop::ExcludeLimit, NodePattern::Macros, RuboCop::AST::Sexp
Instance Chain:
Inherits: RuboCop::Cop::Base
Defined in: lib/rubocop/cop/lint/constant_definition_in_block.rb

Overview

Do not define constants within a block, since the block’s scope does not isolate or namespace the constant in any way.

If you are trying to define that constant once, define it outside of the block instead, or use a variable or method if defining the constant in the outer scope would be problematic.

For meta-programming, use const_set.

Examples:

# bad
task :lint do
  FILES_TO_LINT = Dir['lib/*.rb']
end

# bad
describe 'making a request' do
  class TestRequest; end
end

# bad
module M
  extend ActiveSupport::Concern
  included do
    LIST = []
  end
end

# good
task :lint do
  files_to_lint = Dir['lib/*.rb']
end

# good
describe 'making a request' do
  let(:test_request) { Class.new }
  # see also `stub_const` for RSpec
end

# good
module M
  extend ActiveSupport::Concern
  included do
    const_set(:LIST, [])
  end
end

AllowedMethods: ['enums'] (default)

# good

# `enums` for Typed Enums via `T::Enum` in Sorbet.
# https://sorbet.org/docs/tenum
class TestEnum < T::Enum
  enums do
    Foo = new("foo")
  end
end

Constant Summary

::RuboCop::Cop::Base - Inherited

EMPTY_OFFENSES, RESTRICT_ON_SEND

Class Attribute Summary

::RuboCop::Cop::Base - Inherited

.gem_requirements, .lint?,
.support_autocorrect?

Returns if class supports autocorrect.

.support_multiple_source?

Override if your cop should be called repeatedly for multiple investigations Between calls to on_new_investigation and on_investigation_end, the result of processed_source will remain constant.

Class Method Summary

::RuboCop::Cop::Base - Inherited

.autocorrect_incompatible_with

List of cops that should not try to autocorrect at the same time as this cop.

.badge

Naming.

.callbacks_needed, .cop_name, .department,
.documentation_url

Returns an url to view this cops documentation online.

.exclude_from_registry

Call for abstract Cop classes.

.inherited,
.joining_forces

Override and return the Force class(es) you need to join.

.match?

Returns true if the cop name or the cop namespace matches any of the given names.

.new,
.requires_gem

Register a version requirement for the given gem name.

.restrict_on_send

::RuboCop::ExcludeLimit - Extended

exclude_limit

Sets up a configuration option to have an exclude limit tracked.

transform

Instance Attribute Summary

Instance Method Summary

::RuboCop::Cop::AllowedMethods - Included

::RuboCop::Cop::Base - Inherited

#add_global_offense

Adds an offense that has no particular location.

#add_offense

Adds an offense on the specified range (or node with an expression) Unless that offense is disabled for this range, a corrector will be yielded to provide the cop the opportunity to autocorrect the offense.

#begin_investigation

Called before any investigation.

#callbacks_needed,
#cop_config

Configuration Helpers.

#cop_name, #excluded_file?,
#external_dependency_checksum

This method should be overridden when a cop’s behavior depends on state that lives outside of these locations:

#inspect,
#message

Gets called if no message is specified when calling add_offense or add_global_offense Cops are discouraged to override this; instead pass your message directly.

#name

Alias for Base#cop_name.

#offenses,
#on_investigation_end

Called after all on_…​

#on_new_investigation

Called before all on_…​

#on_other_file

Called instead of all on_…​

#parse

There should be very limited reasons for a Cop to do it’s own parsing.

#parser_engine,
#ready

Called between investigations.

#relevant_file?, #target_rails_version, #target_ruby_version, #annotate, #apply_correction, #attempt_correction,
#callback_argument

Reserved for Cop::Cop.

#complete_investigation

Called to complete an investigation.

#correct, #current_corrector,
#current_offense_locations

Reserved for Commissioner:

#current_offenses, #currently_disabled_lines, #custom_severity, #default_severity, #disable_uncorrectable, #enabled_line?, #file_name_matches_any?, #find_message, #find_severity, #range_for_original, #range_from_node_or_range,
#reset_investigation

Actually private methods.

#use_corrector

::RuboCop::Cop::AutocorrectLogic - Included

::RuboCop::Cop::IgnoredNode - Included

Constructor Details

This class inherits a constructor from RuboCop::Cop::Base

Instance Method Details

#constant_assigned_in_block?(node)

[ GitHub ]

  
# File 'lib/rubocop/cop/lint/constant_definition_in_block.rb', line 70

def_node_matcher :constant_assigned_in_block?, <<~PATTERN
  ({^block_type? [^begin_type? ^^block_type?]} nil? ...)
PATTERN

#method_name(node) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/lint/constant_definition_in_block.rb', line 94

def method_name(node)
  node.ancestors.find(&:block_type?).method_name
end

#module_defined_in_block?(node)

[ GitHub ]

  
# File 'lib/rubocop/cop/lint/constant_definition_in_block.rb', line 75

def_node_matcher :module_defined_in_block?, <<~PATTERN
  ({^block_type? [^begin_type? ^^block_type?]} ...)
PATTERN

#on_casgn(node)

[ GitHub ]

  
# File 'lib/rubocop/cop/lint/constant_definition_in_block.rb', line 79

def on_casgn(node)
  return if !constant_assigned_in_block?(node) || allowed_method?(method_name(node))

  add_offense(node)
end

#on_class(node) Also known as: #on_module

[ GitHub ]

  
# File 'lib/rubocop/cop/lint/constant_definition_in_block.rb', line 85

def on_class(node)
  return if !module_defined_in_block?(node) || allowed_method?(method_name(node))

  add_offense(node)
end

#on_module(node)

Alias for #on_class.

[ GitHub ]

  
# File 'lib/rubocop/cop/lint/constant_definition_in_block.rb', line 90

alias on_module on_class