Comparison to wrong category

[teolemon]

What

• Unsure at this point if it's server or client, but on some products with a "Vegan" erroneous category, we take "Vegan" as a comparison, which create a useless XP

Steps to reproduce the behavior

1. Scan barcode-3760324840351 - https://world.openfoodfacts.org/product/3760324840351/pate-a-tartiner-chocolat-noisettes-sans-lait-bio-la-fourche
2. Click on 'Compare to Category'
3. See error

Expected behavior

Comparison to Hazelnut spreads

Screenshot/Mockup/Before-After

[monsieurtanuki]

@teolemon If you have a look at the server data in https://world.openfoodfacts.org/api/v2/product/3760324840351?fields=categories&lc=fr&cc=fr, this is what you get for categories (similar results for categories_tags and https://world.openfoodfacts.org/api/v2/product/3760324840351?fields=categories_tags&lc=fr&cc=f):

• Spreads
• Breakfasts
• Sweet spreads
• fr:Pâtes à tartiner
• Hazelnut spreads
• Chocolate spreads
• Cocoa and hazelnuts spreads
• fr:Vegan

As we take the last one - which we assumed to be the most detailed - we take "fr:Vegan". Is that an issue on the server side? Should we here in smoothie take the last English category?

[teolemon]

that's not a simple question, and not as simple as taking the last English category (eg wines) @stephanegigandet @alexgarel any ideas ? we'd basically need a boolean indicating whether the category is taxonomized or not

[stephanegigandet]

As suggested by @teolemon we should pick only a taxonomized category, I will change the code on the server side so that we compare only to taxonomized categories (it's not only the compare button, but also the nutrition facts table knowledge panel).

@monsieurtanuki Can you change the app code so that we don't pick the last one, but the one referenced in the compared_to_category field? https://world.openfoodfacts.org/api/v2/product/3760324840351?fields=categories_tags,compared_to_category&lc=fr&cc=f&

Right not it contains fr:vegan, but I'll change it server side.

[stephanegigandet]

Server side part: https://github.com/openfoodfacts/openfoodfacts-server/issues/6853

[stephanegigandet]

The very short term fix is to remove the category "vegan" from those 25 products. This bug might affect a few more bogus categories, but probably not many products.