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# File 'app/controllers/china_region_fu/fetch_options_controller.rb', line 14
def index
validate_params!
regions = sub_klass.order(name: :asc)
regions = regions.where(where_value) if where_value
regions = regions.reorder(level: :asc) if has_level_column?
regions = regions.select(region_fields)
self.response_body = { data: regions.as_json(only: region_fields, methods: region_methods) }.to_json
rescue => e
self.response_body = { error: e.message }.to_json
self.status = 500
end
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