Incorrect parentheses in method definition

Reports method definitions with the incorrect parentheses style. Parentheses are expected in method definitions with parameters, opposite to method definitions without parameters.

Example:

# Bad practice
def example_method(); end
def example_method_with_parameters param1, param2; end

Quick-fixes are available to remove the parentheses or add them respectively. After the quick-fixes are applied, the result looks like this:

# Good practice
def example_method; end
def example_method_with_parameters(param1, param2); end

Inspired by 'RuboCop'

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.

RubyDefParenthesesInspection

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 | Code style issues

Inspection ID: RubyDefParenthesesInspection

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection RubyDefParenthesesInspection

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

RubyMine 2025.2

Inspection Details
By default bundled with:	Qodana for Ruby 2025.2, RubyMine 2025.2,

Last modified: 18 September 2025