Method reserve
has a Cognitive Complexity of 21 (exceeds 5 allowed). Consider refactoring. Open
def reserve(capacity: self.capacity, block_unlock: true)
with_connection do |conn|
booth.first_available_opening(conn) do |opening|
Janitor.lock(opening.name) if config.lock_reserved?
conn.rpoplpush(send("#{config.standby}_key"), opening.name) while openings?(opening, capacity)
- 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
Assignment Branch Condition size for reserve is too high. [22.8/15] Open
def reserve(capacity: self.capacity, block_unlock: true)
with_connection do |conn|
booth.first_available_opening(conn) do |opening|
Janitor.lock(opening.name) if config.lock_reserved?
conn.rpoplpush(send("#{config.standby}_key"), opening.name) while openings?(opening, capacity)
- 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
Method has too many lines. [13/10] Open
def reserve(capacity: self.capacity, block_unlock: true)
with_connection do |conn|
booth.first_available_opening(conn) do |opening|
Janitor.lock(opening.name) if config.lock_reserved?
conn.rpoplpush(send("#{config.standby}_key"), opening.name) while openings?(opening, capacity)
- Read upRead up
- Exclude checks
This cop checks if the length of a method exceeds some maximum value. Comment lines can optionally be ignored. The maximum allowed length is configurable.
Cyclomatic complexity for reserve is too high. [7/6] Open
def reserve(capacity: self.capacity, block_unlock: true)
with_connection do |conn|
booth.first_available_opening(conn) do |opening|
Janitor.lock(opening.name) if config.lock_reserved?
conn.rpoplpush(send("#{config.standby}_key"), opening.name) while openings?(opening, capacity)
- 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.