Assignment Branch Condition size for configurations is too high. [17.38/15] Open
def self.configurations(environment=Rails.env)
@@db_configs ||= YAML.load(ERB.new(File.read(Config.shards_config_file)).result)
environment_config = @@db_configs[environment]
return environment_config if environment_config
- Read upRead up
- Exclude checks
This cop checks that the ABC size of methods is not higher than the configured maximum. The ABC size is based on assignments, branches (method calls), and conditions. See http://c2.com/cgi/wiki?AbcMetric
Cyclomatic complexity for for_each_shard is too high. [7/6] Open
def self.for_each_shard(environment:Rails.env, shard_group_filter:nil, shard_name_filter:nil)
shard_group_filter.to_s if shard_group_filter
shard_name_filter.to_s if shard_name_filter
configurations(environment).each do |shard_group, shards_configurations|
- Read upRead up
- Exclude checks
This cop checks that the cyclomatic complexity of methods is not higher than the configured maximum. The cyclomatic complexity is the number of linearly independent paths through a method. The algorithm counts decision points and adds one.
An if statement (or unless or ?:) increases the complexity by one. An else branch does not, since it doesn't add a decision point. The && operator (or keyword and) can be converted to a nested if statement, and ||/or is shorthand for a sequence of ifs, so they also add one. Loops can be said to have an exit condition, so they add one.
Method for_each_shard
has a Cognitive Complexity of 10 (exceeds 5 allowed). Consider refactoring. Open
def self.for_each_shard(environment:Rails.env, shard_group_filter:nil, shard_name_filter:nil)
shard_group_filter.to_s if shard_group_filter
shard_name_filter.to_s if shard_name_filter
configurations(environment).each do |shard_group, shards_configurations|
- Read upRead up
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
Space missing after colon. Open
def self.for_each_shard(environment:Rails.env, shard_group_filter:nil, shard_name_filter:nil)
- Read upRead up
- Exclude checks
Checks for colon (:) not followed by some kind of space. N.B. this cop does not handle spaces after a ternary operator, which are instead handled by Layout/SpaceAroundOperators.
Example:
# bad
def f(a:, b:2); {a:3}; end
# good
def f(a:, b: 2); {a: 3}; end
Line is too long. [95/80] Open
if Config.no_connection_retrieved_warning && !connection_used && !was_connected_to_master
- Exclude checks
Line is too long. [112/80] Open
ConnectionHandler.connection_pool(shard_group, shard_name).release_connection if shard_group && shard_name
- Exclude checks
Line is too long. [95/80] Open
raise Errors::ConfigNotFoundError, Config.shards_config_file.to_s + ' file was not found'
- Exclude checks
Extra empty line detected at class body beginning. Open
# Opens a block where all queries will be directed to the selected shard
- Read upRead up
- Exclude checks
This cops checks if empty lines around the bodies of classes match the configuration.
Example: EnforcedStyle: empty_lines
# good
class Foo
def bar
# ...
end
end
Example: EnforcedStyle: emptylinesexcept_namespace
# good
class Foo
class Bar
# ...
end
end
Example: EnforcedStyle: emptylinesspecial
# good
class Foo
def bar; end
end
Example: EnforcedStyle: noemptylines (default)
# good
class Foo
def bar
# ...
end
end
Space missing after colon. Open
def self.for_each_shard(environment:Rails.env, shard_group_filter:nil, shard_name_filter:nil)
- Read upRead up
- Exclude checks
Checks for colon (:) not followed by some kind of space. N.B. this cop does not handle spaces after a ternary operator, which are instead handled by Layout/SpaceAroundOperators.
Example:
# bad
def f(a:, b:2); {a:3}; end
# good
def f(a:, b: 2); {a: 3}; end
Line is too long. [86/80] Open
shard_group, shard_name, connection_used = ShardThreadRegistry.pop_current_shard
- Exclude checks
Surrounding space missing in default value assignment. Open
def self.configurations(environment=Rails.env)
- Read upRead up
- Exclude checks
Checks that the equals signs in parameter default assignments have or don't have surrounding space depending on configuration.
Example:
# bad
def some_method(arg1=:default, arg2=nil, arg3=[])
# do something...
end
# good
def some_method(arg1 = :default, arg2 = nil, arg3 = [])
# do something...
end
Line is too long. [171/80] Open
raise Errors::ConfigNotFoundError, 'Found no shard configurations for environment "' + environment + '" in ' + Config.shards_config_file.to_s + ' file was not found'
- Exclude checks
Missing magic comment # frozen_string_literal: true
. Open
require 'rails/sharding/active_record_extensions'
- Read upRead up
- Exclude checks
This cop is designed to help upgrade to Ruby 3.0. It will add the
comment # frozen_string_literal: true
to the top of files to
enable frozen string literals. Frozen string literals may be default
in Ruby 3.0. The comment will be added below a shebang and encoding
comment. The frozen string literal comment is only valid in Ruby 2.3+.
Example: EnforcedStyle: when_needed (default)
# The `when_needed` style will add the frozen string literal comment
# to files only when the `TargetRubyVersion` is set to 2.3+.
# bad
module Foo
# ...
end
# good
# frozen_string_literal: true
module Foo
# ...
end
Example: EnforcedStyle: always
# The `always` style will always add the frozen string literal comment
# to a file, regardless of the Ruby version or if `freeze` or `<<` are
# called on a string literal.
# bad
module Bar
# ...
end
# good
# frozen_string_literal: true
module Bar
# ...
end
Example: EnforcedStyle: never
# The `never` will enforce that the frozen string literal comment does
# not exist in a file.
# bad
# frozen_string_literal: true
module Baz
# ...
end
# good
module Baz
# ...
end
Missing top-level class documentation comment. Open
class Core
- Read upRead up
- Exclude checks
This cop checks for missing top-level documentation of classes and modules. Classes with no body are exempt from the check and so are namespace modules - modules that have nothing in their bodies except classes, other modules, or constant definitions.
The documentation requirement is annulled if the class or module has a "#:nodoc:" comment next to it. Likewise, "#:nodoc: all" does the same for all its children.
Example:
# bad
class Person
# ...
end
# good
# Description/Explanation of Person class
class Person
# ...
end
Redundant self
detected. Open
self.configurations.keys
- Read upRead up
- Exclude checks
This cop checks for redundant uses of self
.
The usage of self
is only needed when:
Sending a message to same object with zero arguments in presence of a method name clash with an argument or a local variable.
Calling an attribute writer to prevent an local variable assignment.
Note, with using explicit self you can only send messages with public or protected scope, you cannot send private messages this way.
Note we allow uses of self
with operators because it would be awkward
otherwise.
Example:
# bad
def foo(bar)
self.baz
end
# good
def foo(bar)
self.bar # Resolves name clash with the argument.
end
def foo
bar = 1
self.bar # Resolves name clash with the local variable.
end
def foo
%w[x y z].select do |bar|
self.bar == bar # Resolves name clash with argument of the block.
end
end
Redundant self
detected. Open
self.configurations('test')
- Read upRead up
- Exclude checks
This cop checks for redundant uses of self
.
The usage of self
is only needed when:
Sending a message to same object with zero arguments in presence of a method name clash with an argument or a local variable.
Calling an attribute writer to prevent an local variable assignment.
Note, with using explicit self you can only send messages with public or protected scope, you cannot send private messages this way.
Note we allow uses of self
with operators because it would be awkward
otherwise.
Example:
# bad
def foo(bar)
self.baz
end
# good
def foo(bar)
self.bar # Resolves name clash with the argument.
end
def foo
bar = 1
self.bar # Resolves name clash with the local variable.
end
def foo
%w[x y z].select do |bar|
self.bar == bar # Resolves name clash with argument of the block.
end
end
Favor modifier if
usage when having a single-line body. Another good alternative is the usage of control flow &&
/||
. Open
if block_given?
- Read upRead up
- Exclude checks
Checks for if and unless statements that would fit on one line
if written as a modifier if/unless. The maximum line length is
configured in the Metrics/LineLength
cop.
Example:
# bad
if condition
do_stuff(bar)
end
unless qux.empty?
Foo.do_something
end
# good
do_stuff(bar) if condition
Foo.do_something unless qux.empty?
Line is too long. [84/80] Open
# Releases connections in case user left some connection in the reserved state
- Exclude checks
Use a guard clause instead of wrapping the code inside a conditional expression. Open
if Config.extend_active_record_scope
- Read upRead up
- Exclude checks
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
Prefer using YAML.safe_load
over YAML.load
. Open
@@db_configs ||= YAML.load(ERB.new(File.read(Config.shards_config_file)).result)
- Read upRead up
- Exclude checks
This cop checks for the use of YAML class methods which have potential security issues leading to remote code execution when loading from an untrusted source.
Example:
# bad
YAML.load("--- foo")
# good
YAML.safe_load("--- foo")
YAML.dump("foo")
Replace class var @@db_configs with a class instance var. Open
@@db_configs = nil
- Read upRead up
- Exclude checks
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.
Extra empty line detected at class body end. Open
end
- Read upRead up
- Exclude checks
This cops checks if empty lines around the bodies of classes match the configuration.
Example: EnforcedStyle: empty_lines
# good
class Foo
def bar
# ...
end
end
Example: EnforcedStyle: emptylinesexcept_namespace
# good
class Foo
class Bar
# ...
end
end
Example: EnforcedStyle: emptylinesspecial
# good
class Foo
def bar; end
end
Example: EnforcedStyle: noemptylines (default)
# good
class Foo
def bar
# ...
end
end
Line is too long. [86/80] Open
@@db_configs ||= YAML.load(ERB.new(File.read(Config.shards_config_file)).result)
- Exclude checks
Replace class var @@db_configs with a class instance var. Open
@@db_configs ||= YAML.load(ERB.new(File.read(Config.shards_config_file)).result)
- Read upRead up
- Exclude checks
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.
Space missing after colon. Open
def self.for_each_shard(environment:Rails.env, shard_group_filter:nil, shard_name_filter:nil)
- Read upRead up
- Exclude checks
Checks for colon (:) not followed by some kind of space. N.B. this cop does not handle spaces after a ternary operator, which are instead handled by Layout/SpaceAroundOperators.
Example:
# bad
def f(a:, b:2); {a:3}; end
# good
def f(a:, b: 2); {a: 3}; end
Line is too long. [320/80] Open
puts "Warning: no connection to shard '#{shard_group}:#{shard_name}' was retrieved inside the using_shard block. Make sure you don't forget to include Rails::Sharding::ShardableModel to the models you want to be sharded. Disable this warning with Rails::Sharding::Config.no_connection_retrieved_warning = false."
- Exclude checks
Line is too long. [97/80] Open
def self.for_each_shard(environment:Rails.env, shard_group_filter:nil, shard_name_filter:nil)
- Exclude checks
Use nested module/class definitions instead of compact style. Open
module Rails::Sharding
- Read upRead up
- Exclude checks
This cop checks the style of children definitions at classes and modules. Basically there are two different styles:
Example: EnforcedStyle: nested (default)
# good
# have each child on its own line
class Foo
class Bar
end
end
Example: EnforcedStyle: compact
# good
# combine definitions as much as possible
class Foo::Bar
end
The compact style is only forced for classes/modules with one child.
Redundant self
detected. Open
self.configurations[shard_group.to_s].keys
- Read upRead up
- Exclude checks
This cop checks for redundant uses of self
.
The usage of self
is only needed when:
Sending a message to same object with zero arguments in presence of a method name clash with an argument or a local variable.
Calling an attribute writer to prevent an local variable assignment.
Note, with using explicit self you can only send messages with public or protected scope, you cannot send private messages this way.
Note we allow uses of self
with operators because it would be awkward
otherwise.
Example:
# bad
def foo(bar)
self.baz
end
# good
def foo(bar)
self.bar # Resolves name clash with the argument.
end
def foo
bar = 1
self.bar # Resolves name clash with the local variable.
end
def foo
%w[x y z].select do |bar|
self.bar == bar # Resolves name clash with argument of the block.
end
end