Unnecessary use of double quotes in string

Reports double-quoted strings that can be converted to single-quoted. Any string that doesn't contain any expression substitutions, or special symbols may be converted.

Example:

# Bad practice
"Hello world"
"Hello \"John Doe\""

A quick-fix to convert a double-quoted string is available. After the quick-fix is applied, the result looks like this:

# Good practice
'Hello world'
'Hello "John Doe"'
"Hello 'John Doe'"

Use the Ignore strings containing single quotes checkbox to ignore strings that require escaping.

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.

RubyQuotedStringsInspection

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: RubyQuotedStringsInspection

Inspection options

Here you can find the description of settings available for the Unnecessary use of double quotes in string inspection, and the reference of their default values.

Ignore strings containing single quotes

Option ID:

myIgnoreSingleQuote

Default value:

Not selected

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 RubyQuotedStringsInspection

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