My preferred rubocop

.rubocop.yml

# gem install rubocop-rails
# gem install rubocop-performance

# SublimeLinter Settings - User (if using rbenv)
# {
#   "paths": {
#       "osx": [
#         "~/.rbenv/shims"
#       ]
#     }
# }

require:
  - rubocop-rails
  - rubocop-performance

# -------------------------------------------- Rails
Rails:
  Enabled: true

Rails/Delegate:
  Enabled: false

Rails/RefuteMethods:
  Enabled: false

Rails/FilePath:
  EnforcedStyle: slashes
  Enabled: true

Rails/DynamicFindBy:
  Enabled: false

Rails/HasAndBelongsToMany:
  Enabled: false

# -------------------------------------------- Style
Style/Documentation:
  Enabled: false

Style/FloatDivision:
  Enabled: false

Style/HashEachMethods:
  Enabled: true

Style/HashTransformKeys:
  Enabled: true

Style/HashTransformValues:
  Enabled: true

Style/FrozenStringLiteralComment:
  Enabled: false

Style/SymbolArray:
  Enabled: true

Style/WordArray:
  Enabled: false

Style/GlobalVars:
  Enabled: true

Style/PreferredHashMethods:
  Enabled: false

Style/Lambda:
  Enabled: false
  EnforcedStyle: literal

Style/SignalException:
  EnforcedStyle: semantic
  Enabled: true

Style/TernaryParentheses:
  EnforcedStyle: require_parentheses_when_complex
  Enabled: true


# -------------------------------------------- Layout
Layout/HashAlignment:
  EnforcedColonStyle: table
  EnforcedHashRocketStyle: table

Layout/LineLength:
  Max: 150

Layout/ParameterAlignment:
  Enabled: false

Layout/FirstArrayElementIndentation:
  Enabled: false

Layout/EmptyLineAfterGuardClause:
  Enabled: false

Layout/FirstArgumentIndentation:
  Enabled: true
  EnforcedStyle: consistent

Layout/HeredocIndentation:
  Enabled: true
  EnforcedStyle: squiggly


# -------------------------------------------- Metrics
Metrics/AbcSize:
  Max: 75

Metrics/BlockLength:
  Max: 41

Metrics/ClassLength:
  Max: 435

Metrics/CyclomaticComplexity:
  Max: 14

Metrics/MethodLength:
  Max: 55

Metrics/ModuleLength:
  Max: 310

Metrics/ParameterLists:
  Max: 10

Metrics/PerceivedComplexity:
  Max: 15


# -------------------------------------------- Naming
Naming/MethodName:
  EnforcedStyle: snake_case


# -------------------------------------------- Performance
Performance/Casecmp:
  Enabled: true

Performance/Count:
  Enabled: true

Performance/FlatMap:
  Enabled: true

Performance/RangeInclude:
  Enabled: true

Performance/RegexpMatch:
  Enabled: true

Performance/Size:
  Enabled: true


# -------------------------------------------- Lint
Lint/RaiseException:
  Enabled: false

Lint/StructNewOverride:
  Enabled: false

Lint/UselessAssignment:
  Enabled: false