feat: 5553 - add prices for category products

[monsieurtanuki]

What

• Now when we add prices, we can add prices related to a category (e.g. "apples") instead of barcode

Screenshots

new "category input" button	new "category input" page

new "price per" button	category price input

Fixes bug(s)

• Closes: Allow to add prices of products without barcode #5553

Files

New files:

• price_category_input_page.dart: Page that lets the user type in and select a single category for prices.
• price_per_extension.dart: Extension for PricePer.

Impacted files:

• app_en.arb: added 4 labels related to category and prices
• app_fr.arb: added 4 labels related to category and prices
• background_task_add_other_price.dart: added parameters related to category prices
• background_task_add_price.dart: added parameters related to category prices
• background_task_price.dart: added parameters related to category prices
• price_add_product_card.dart: added an "add category product" button
• price_amount_card.dart: added a DropDownButton for "price per" for category product
• price_amount_model.dart: taken category prices into consideration
• price_existing_amount_card.dart: unrelated localization
• price_meta_product.dart: added a new meta product, related to category
• price_model.dart: added parameters related to category prices
• smooth_autocomplete_text_field.dart: added an "onSelected" optional parameter, in order to be able to select immediately a suggestion
• smooth_dropdown.dart: added an "isExpanded" optional parameter, in order to match the screen width

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0.44248% with 225 lines in your changes missing coverage. Please review.

Project coverage is 5.69%. Comparing base (4d9c7fc) to head (091bdaa).
Report is 896 commits behind head on develop.

Files with missing lines	Patch %	Lines
...pp/lib/pages/prices/price_category_input_page.dart	0.92%	107 Missing ⚠️
...p/lib/pages/prices/price_existing_amount_card.dart	0.00%	26 Missing ⚠️
...ooth_app/lib/background/background_task_price.dart	0.00%	24 Missing ⚠️
...mooth_app/lib/pages/prices/price_meta_product.dart	0.00%	19 Missing ⚠️
...h_app/lib/pages/prices/price_add_product_card.dart	0.00%	12 Missing ⚠️
...smooth_app/lib/pages/prices/price_amount_card.dart	0.00%	11 Missing ⚠️
...kages/smooth_app/lib/pages/prices/price_model.dart	0.00%	8 Missing ⚠️
...ooth_app/lib/pages/prices/price_per_extension.dart	0.00%	6 Missing ⚠️
...ib/pages/input/smooth_autocomplete_text_field.dart	0.00%	5 Missing ⚠️
..._app/lib/pages/prices/price_product_list_tile.dart	0.00%	3 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #6552      +/-   ##
==========================================
- Coverage     9.54%   5.69%   -3.86%     
==========================================
  Files          325     512     +187     
  Lines        16411   30639   +14228     
==========================================
+ Hits          1567    1745     +178     
- Misses       14844   28894   +14050     

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[TTalex]

Very cool, some thoughts:

• Maybe the "Enter a category" text can be replace with something like "Add a product without barcode" ? We have the same issue in prices web, the category term isn't clear for new users.
• The API also supports fields like organic (is the product organic) and orgin (where is the product from). They aren't mandatory, but useful for data quality. Maybe something to add in a V2.
• More of a taxonomy issue, but it would be nice to only suggest categories related to products without barcodes (fruits and vegetables)

[monsieurtanuki]

Thank you @TTalex for your feedback!

Maybe the "Enter a category" text can be replace with something like "Add a product without barcode" ? We have the same issue in prices web, the category term isn't clear for new users.

I can do that.
Fun fact: yesterday I was in a French store (monoprix) and there were tourists trying to weight a melon on a machine. They couldn't find the "melon" button. I told the guy he won't manage to do that and he replied something like "but there's no barcode!". In that case the price was per unit. The concept of "no barcode" may indeed be relevant.

The API also supports fields like organic (is the product organic) and orgin (where is the product from). They aren't mandatory, but useful for data quality. Maybe something to add in a V2.

I'm not sure I'm going to do that right now, UX-wise.
I'm going to populate those extra fields, though, for internal reasons.

• More of a taxonomy issue, but it would be nice to only suggest categories related to products without barcodes (fruits and vegetables)

I'm sure they sell "home-made muesli" so it wouldn't be a good idea to limit to fruits and vegetables.
As a matter of fact, my first addition was a fish.

[monsieurtanuki]

@TTalex Changed the label into "no barcode" and added origins.

@raphael0202 @raphodn @teolemon Something not working with the labels to tags conversion (prefixing with 2-letter iso code), for both "category" and "origins".
Sometimes it work, sometimes it doesn't.
I'm not even sure the taxonomy and the autocomplete share the same data:

• https://world.openfoodfacts.org/api/v2/taxonomy?tagtype=origins&include_children=0&lc=fr&cc=fr&tags=en:languedoc-roussillon
• https://world.openfoodfacts.org/api/v2/taxonomy?tagtype=origins&include_children=0&lc=en&cc=fr&tags=fr:languedoc-roussillon

new "no barcode" label	new "origins" input

"category" autocomplete	"origins" autocomplete

prices input	when done

[monsieurtanuki]

@teolemon ping

[teolemon]

@g123k @monsieurtanuki ok to merge ?

[g123k]

/gemini review

Honestly, this is just some spam

[Copilot]

Pull Request Overview

Adds support for entering and storing category-based prices alongside barcode-based prices.

• Introduces a new “category input” page and metadata in PriceMetaProduct
• Extends the pricing model and background tasks to include category tags, origin tags, labels, and price-per units
• Updates multiple UI cards and dropdowns to let users select categories and price-per units

Reviewed Changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
smooth_dropdown.dart	Added isExpanded flag to SmoothDropdownButton
price_product_list_tile.dart	Conditionally show barcode and origin names
price_per_extension.dart	Added PricePer extension for localized titles
price_model.dart	Collected category/origin/label/price-per data in tasks
price_meta_product.dart	New category constructor and related getters
price_existing_amount_field.dart	Display localized short price-per suffix
price_existing_amount_card.dart	Show saved category and origin alongside price
price_category_input_page.dart	New page for entering/selecting a price category
smooth_autocomplete_text_field.dart	Optional onSelected callback in autocomplete field
price_amount_model.dart	Validation updated to allow category-only entries
price_amount_card.dart	Category dropdown for selecting price-per unit
price_add_product_card.dart	Added button to open category input page
background_task_price.dart	Serialize/deserialize category/origin/label/price-per
background_task_add_price.dart	Pass new metadata through to base task
background_task_add_other_price.dart	Pass new metadata through to base task
app_fr.arb / app_en.arb	Added localization keys for category and price-per

Comments suppressed due to low confidence (3)

packages/smooth_app/lib/pages/prices/price_amount_model.dart:63

• [nitpick] The returned error message still says “no product” even when the issue may be a missing category. Consider updating the message to reflect that a category must be provided when no barcode is entered.

if (product.barcode.isEmpty && product.categoryTag.isEmpty) {

packages/smooth_app/lib/pages/prices/price_category_input_page.dart:21

• New UI page PriceCategoryInputPage has no accompanying unit or widget tests. Adding tests would help prevent regressions in the category-entry flow.

class PriceCategoryInputPage extends StatefulWidget {

packages/smooth_app/lib/pages/prices/price_existing_amount_card.dart:36

• Property name originsTags does not exist on PriceMetaProduct. The getter is named originTags, so this should be widget.price.originTags.

_originTags = widget.price.originsTags;

[raphael0202]

@raphael0202 @raphodn @teolemon Something not working with the labels to tags conversion (prefixing with 2-letter iso code), for both "category" and "origins".
Sometimes it work, sometimes it doesn't.
I'm not even sure the taxonomy and the autocomplete share the same data:

They should share the same data, we load it from the server regularly on Robotoff.

But there is definitely a bug on openfoodfacts-python, where the matching with xx: prefixes is not working. Thank you for bringing that up!

[g123k]

Sorry for the late review @monsieurtanuki.
Could you use in the new view SmoothCardWithRoundedHeader?

It will have the same look'n'feel as the price addition.
Thanks 👍

[monsieurtanuki]

Sorry for the late review @monsieurtanuki. Could you use in the new view SmoothCardWithRoundedHeader?

@g123k Thank your for your comment.
Assuming that it's the only "negative" comment you have about this PR, I'll be happy to code your suggestion in that PR if that PR gets approved first.
We're very close to my "Closing-as-stale after 2 months" policy. Again.

[teolemon]

We can probably indeed survive visually until the next PR if that's the only thing left @monsieurtanuki @g123k

[teolemon]

thank you for your patience @monsieurtanuki

[teolemon]

and thanks for this nice addition for Open Prices :-)

[monsieurtanuki]

Thank you @teolemon for your review!

@g123k Actually I was in the middle of coding your SmoothCardWithRoundedHeader suggestion:

It looks like we'd be better off implementing other features too, like being able to delete an already selected value (here, 'France"), and I'm sure that while using this "no barcode product" feature we'll find other improvements.
I'm about to open an issue about it.

[monsieurtanuki]

I've just created #6645.