'nil' dereference

Reports possible nil dereferences. Dereferencing nil may cause a NoMethodError.

Use the Ignored receivers list to specify method calls used as receivers that should be ignored (for example, Foo#call or Foo::call for an instance or a singleton method respectively).

Example:

def foo
  rand(2) == 1 ? nil : 1
end

a = foo
a.nomethod # method invocation may produce NoMethodError

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

RubyNilAnalysis

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Ruby | Data flow

Inspection options

Here you can find the description of settings available for the 'nil' dereference inspection, and the reference of their default values.

Ignored receivers: [Array#[], Enumerable#group_by, Hash#[]]

Inspection Details
By default bundled with:	Qodana for Ruby 2024.3, RubyMine 2024.3,
Can be installed with plugin:	Ruby, 243.23135

Last modified: 03 December 2024