Lint/AmbiguousRegexpLiteral: Ambiguous regexp literal. Parenthesize the method arguments if it's surely a regexp literal, or add a whitespace to the right of the `/` if it should be a division.

Metrics/ClassLength: Class has too many lines. [259/100]

Metrics/AbcSize: Assignment Branch Condition size for initialize is too high. [<5, 17, 7> 19.05/17]

Metrics/MethodLength: Method has too many lines. [14/10]

Naming/PredicateName: Rename `has_one` to `one?`.

Style/RedundantParentheses: Don't use parentheses around a literal.

Layout/LineLength: Line is too long. [125/120]

Metrics/AbcSize: Assignment Branch Condition size for has_many is too high. [<7, 19, 4> 20.64/17]

Metrics/MethodLength: Method has too many lines. [11/10]