New page that lists all Price tag proofs without any prices yet (= open for contribution)

[raphodn]

Story

Following changes in the backend - openfoodfacts/open-prices#568 - users are now allowed to add prices on PRICE_TAG proofs they do now own. Thus unlocking distributed contribution.

To kickstart this, we need a page that lists all available proofs open for contribution.

How

A list of all proofs that have the following caracteristics:

• type = PRICE_TAG
• price_count = 0
• location_id__isnull = False

And clear actions for each proof :

• view full size image
• add prices
• add prices via the contribution assistant

Questions

• how to avoid users adding prices on the same proof ?
• how to skip proofs that are unreable or without any barcodes displayed ?
  • allow users to tag proofs ?

Ideas

• display proofs in a random order on each load, to mitigate the risk of having 2 users simultaneously adding prices on the same proof

[raphael0202]

Displaying proofs at random is enough for now! We should just keep in mind that SQL random() doesn't scale well to huge tables (as seen on Robotoff).
I wonder whether it's better to wait for openfoodfacts/open-prices#611 to be implemented in the backend, as it will make it easier from a front-end perspective:

• fetch the price_tags with status=null randomly
• annotate (using an interface similar to the 3rd step from the contribution assistant)
• repeat

Another game could be to check that no bounding box (=item in the price_tag table) is missing, and if there are some, the user draw additional bounding boxes, which become available as new price_tags items to annotate.

[raphodn]

I think in the meantime I'll just do a global "Latest proofs" page

[raphodn]

closing as we'll wait a bit and build a "prices to validate list" instead of this "proofs to add list"