Check if a product is a data-bearing leaf or an empty container

The Trafa API does not model parent-child relationships between products explicitly. However, some products (e.g. "Fordon på väg", t10010) have dimensions and measures in their structure but return no data rows — they act as organizational containers. This function checks whether a product has actual data by inspecting its structure for dimension/measure items whose parent_name matches the product code, and then verifying whether the data endpoint returns rows.

Usage

product_has_data(
  product,
  lang = NULL,
  cache = FALSE,
  cache_location = trafa_cache_dir,
  verbose = FALSE
)

Arguments

product: Character: product code.
lang, cache, cache_location, verbose: Standard rTrafa args.

Value

Logical: TRUE if the product's data endpoint returns rows, FALSE if it appears to be an empty container.

Details

Note: when a product is a container, the related "sub-products" cannot be discovered programmatically via the API. Use product_search() on the product catalogue to find products with similar names (e.g. product_search(get_products(), "fordon")).

Examples

# \donttest{
if (trafa_available()) {
  product_has_data("t10011")   # TRUE — Bussar has data
  product_has_data("t10010")   # FALSE — container, no data rows
}# }
#> Warning: No data rows in Trafa API response.
#> [1] FALSE