Rubocop rules

.rubocop/rails.yml

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+# Cross-Repository conguration for Cops of the rubocop-rails extension
+
+Rails/BelongsTo:
+  # This is about changing "required: true" to "optional: false". Wording of
+  # this warning is a bit unfortunate, as it suggest the option is not needed
+  # at all:
+  #
+  # C: [Correctable] Rails/BelongsTo: You specified required: true, in Rails
+  # > 5.0 the required option is deprecated and you want to use optional:
+  # false. In most configurations, this is the default and you can omit this
+  # option altogether
+  #
+  # This is only true, if framework defaults for 5.0 are loaded or special
+  # option config.active_record.belongs_to_required_by_default is set to true.
+  #
+  # None of those are set in MDMS, so lets remove this cop, to avoid pushing
+  # someone to remove the "required: true" and changing the behaviour by
+  # mistake.
+  Enabled: false
+
+Rails/RedundantPresenceValidationOnBelongsTo:
+  # See comment for Rails/BelongsTo. Our setting for default is different
+  # than defaults in Rails 5+ applications. This should not be enabled.
+  Enabled: false