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Nutrition: Entering values: expand the trace-amounts entry guidance
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==== Bad examples ====
 
==== Bad examples ====
* <code>Petit déjeuner Nesquick</code> => you don't have to explain, just put the name from the packaging
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* <code><u>Petit déjeuner</u> Nesquick</code> => you don't have to explain, just put the name from the packaging
* <code>Nutella by Ferrero</code> => you shouldn't fill the brand here, there's a field for that :)
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* <code>Nutella <u>by Ferrero</u></code> => you shouldn't fill the brand here, there's a field for that :)
* <code>Nesquick®</code> => Don't use symbols ®, ™, © or similar in product name data field or even in other fields.
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* <code>Nesquick<u>®</u></code> => Don't use symbols ®, ™, © or similar in product name data field or even in other fields.
    
=== Common name ===
 
=== Common name ===
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Open Food Facts gathered [https://world.openfoodfacts.org/packager-codes 25,000+ codes] as of 2021-08-18. These codes allow to localize the places on a map: https://world.openfoodfacts.org/packager-code/fr-72-264-002-ce
 
Open Food Facts gathered [https://world.openfoodfacts.org/packager-codes 25,000+ codes] as of 2021-08-18. These codes allow to localize the places on a map: https://world.openfoodfacts.org/packager-code/fr-72-264-002-ce
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We use it to produce the world map of products: https://cestemballepresdechezvous.fr/ (fr) and https://madenear.me/ (en) [down on 2021-08-19].
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We use it to produce the world map of products: https://cestemballepresdechezvous.fr/ (fr) and https://madenear.me/ (en).
    
=== Best before date (expiration date) ===
 
=== Best before date (expiration date) ===
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'''Answer:''' yes
 
'''Answer:''' yes
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'''Question''': what do I enter when the label says something like "contains trace amounts of ..."?
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'''Answer''': you can enter the word "traces" as the value, and the system recognizes this as "approximately zero".
    
=== Missing value ===
 
=== Missing value ===
When th nutrition facts table is missing some values, enter the "-" (hyphen symbol) for that field. For example the '''''Fiber''''' value is sometime missing.
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When the nutrition facts table is missing some values, enter the "-" (hyphen symbol) for that field. For example the '''''Fiber''''' value is sometime missing.
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== Photos and data check ==
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At the end of the page, there is a specific section called "Photos and data check", documented as follow:
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"Product pages can be marked as checked by experienced contributors who verify that the most recent photos are selected and cropped, and that all the product data that can be inferred from the product photos has been filled and is correct."
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When <code>[x] Photos and data checked</code> is checked, Product Opener save the following data into the database:
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* the value <code>on</code> in the field <code>checked</code>
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* the last checked date (Unix timestamp format) into <code>last_checked_t</code>. Eg. <code>last_checked_t: 1704906819</code>.
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* the last user who checked the product into <code>last_checker</code>. Eg. <code>last_checker: benbenben</code>.
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* the users who have checked the products are stored in the field <code>checkers_tags</code>. Eg. <code>checkers_tags: ["benbenben","stephane"]</code>.
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When <code>[x] I checked the photos and data again</code> is checked, Product Opener update the following data:
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* the last checked date (Unix timestamp format) into <code>last_checked_t</code>.
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* the last user who checked the product into <code>last_checker</code>.
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* the users who have checked the products are stored in the field <code>checkers_tags</code>.
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When a product is checked, this information is given on the product page, in the '''Data sources''' section, eg. "Last check of product page on January 10, 2024, 6:13:39 PM CET by charlesnepote".
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These data can also be retrived via the API.
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It's possible to explore the checked products with the dropdown menu "Explore products by...", selecting "Last checked dates", leading to the page: https://world.openfoodfacts.org/last-check-dates
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It's possible to combine facets, for example, to get last checked dates of the TOP-1000 products in a country, eg. https://world.openfoodfacts.net/popularity/top-1000-fr-scans-2022/last-check-dates
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