Allergen

One of the 14 allergens a food label must name (UK FIR 2014 and EU Regulation 1169/2011, Annex II), written as its own name, milk, and shown as the Food Standards Agency words it.

Health; not ordered; since Jadpo 0.1.0.

Make one

Pick one of its variants, Allergen.celery.

text.parse(raw, as: Allergen) reads one from its text; text that isn't one at all fails malformed, such as gluten, nuts or Cereals containing gluten.

Variants

14 variants, each written as its own name: celery, cereals_containing_gluten, crustaceans, eggs, fish, lupin, milk, molluscs, mustard, peanuts, sesame, soybeans, sulphites, tree_nuts.

Text, JSON and storage

text.from writes its canonical text, the one form text.parse reads back. JSON sends its canonical text as a string.

It is stored in one column named for the field, of type text. milk is stored as 'milk'.

Shown to people

text.format(value, locale:) shows it to people in their locale.

With locale: Locale.en_gb:

Operations

It has the contract's own operations: text.parse, text.from, text.format, json.read, json.write and ==. It isn't ordered, so < and sorting don't take it. Every standard type meets one contract says how they work.