Rails/ThreeStateBooleanColumn parse exception when table/column is dynamic

[vlad-pisanov]

Currently, Rails/ThreeStateBooleanColumn assumes that the table name and the column name are literals. Passing in a variable or a constant raises a parse exception:

An error occurred while Rails/ThreeStateBooleanColumn cop was inspecting
db/migrate/test.rb:42:6.
undefined method `value' for s(:const, nil, :column):RuboCop::AST::ConstNode

Sample migration:

def up
   table  = :users
   column = :is_admin

   add_column :users, :is_admin, :boolean   # ✔️
   add_column table,  :is_admin, :boolean   # 💥parse exception
   add_column :users,  column,   :boolean   # 💥parse exception
end

(version rubocop-rails-2.19.1)