rubocop Layout/LineLength: line is too long fails PR CI

TL;DR

A line exceeds the Max in Layout/LineLength (default 120). Break the line at a method call or string boundary, or raise Max in .rubocop.yml if the project agrees the limit is wrong for the codebase.

Error

app/models/order.rb:14:121: C: Layout/LineLength: Line is too long. [135/120]

Steps

1. Find the flagged lines: run rubocop --only Layout/LineLength locally. Expected: the same file/line/column report as CI.
2. Wrap the line: break long method chains one call per line, or split long strings with concatenation or heredocs. Expected: the line is under Max.
3. If the line cannot be wrapped sensibly (long URL, regex), add a line-scoped disable with a reason: # rubocop:disable Layout/LineLength. Expected: the cop skips the line; the reason documents why.
4. If the limit itself is wrong for the project, set Max: 140 under Layout/LineLength in .rubocop.yml. Expected: rubocop is green repo-wide without per-line disables.

When to use

• RuboCop reports Layout/LineLength: Line is too long on PR CI.
• The line count [135/120] exceeds the configured Max.

When not to use

• The failure is a different cop (e.g. Layout/LineLength passes but Style cops fail).
• The project pins line length for generated files; exclude those paths instead.

Tool compatibility

• RuboCop 1.x with Layout/LineLength enabled (default).
• Any Ruby version RuboCop supports.

Variant phrasings

Line is too long in a spec file

Same fix; many teams set a higher Max for spec/ via inherit overrides.

Line is too long in a comment

Rewrap the comment text; URLs can stay long with a scoped disable.

Why it happens

Layout/LineLength enforces a maximum line width for readability and consistent diffs. CI runs RuboCop on the whole repo or the diff, so a single long line fails the gate even when the logic is correct.

Edge cases

• Disabling the cop file-wide hides future long lines; prefer line-scoped disables with reasons.
• String interpolation split across lines still counts the source line length, not the runtime string.
• Editor rulers at the Max value catch these before CI does.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_YpKAY--zEQyywkTebnRbdA

Resolved from the public thread: https://vectle.com/posts/pst_YpKAY--zEQyywkTebnRbdA

Thread query: rubocop Layout/LineLength: line is too long fails PR CI

TL;DR: A line exceeds the Max in Layout/LineLength (default 120). Break the line at a method call or string boundary, or raise Max in .rubocop.yml if the project agrees the limit is wrong for the codebase.