[FIX][IMP] portal_rating: round decimal ratings to two decimals

When hovering the number of stars of a course in front-end, for instance,
one can see "4,16666666666667 stars on 5". This is not very convenient.
The number is rounded up to two decimals instead. -> "4,17 stars on 5".

Same fix is done in backend in slides-specific kanban view of ratings. Value
is now rounded.

Finally _rating_get_repartition is fixed round values to the nearest half
value. We generally receive integer values between 0 and 5 but other values
may exist. Getting a repartition rounded at nearest half integer is sufficient
notably when looking at star-based display which covers only complete or half
complete stars.

Task-2728564

Part-of: odoo/odoo#82792
Co-authored-by: Noé Antoine <nan@odoo.com>
Co-authored-by: Thibault Delavallée <tde@odoo.com>

addons/portal_rating/static/src/js/portal_chatter.js

@@ -138,13 +138,14 @@ PortalChatter.include({
         if (!result['rating_stats']) {
             return;
         }
+        const self = this;
         const ratingData = {
             'avg': Math.round(result['rating_stats']['avg'] * 100) / 100,
             'percent': [],
         };
-        _.each(_.keys(result['rating_stats']['percent']).reverse(), function (rating) {
+        _.each(_.sortBy(_.keys(result['rating_stats']['percent'])).reverse(), function (rating) {
             ratingData['percent'].push({
-                'num': rating,
+                'num': self.roundToHalf(rating),
                 'percent': utils.round_precision(result['rating_stats']['percent'][rating], 0.01),
             });
         });

addons/portal_rating/static/src/xml/portal_tools.xml

@@ -4,7 +4,10 @@
         <t t-set="val_integer" t-value="Math.floor(val)"/>
         <t t-set="val_decimal" t-value="val - val_integer"/>
         <t t-set="empty_star" t-value="5 - (val_integer+Math.ceil(val_decimal))"/>
-        <div class="o_website_rating_static" t-att-style="inline_mode ? 'display:inline' : ''" t-attf-aria-label="#{val} stars on 5" t-attf-title="#{val} stars on 5">
+        <div class="o_website_rating_static"
+             t-att-style="inline_mode ? 'display:inline' : ''"
+             t-attf-aria-label="#{Math.round(val * 100) / 100} stars on 5"
+             t-attf-title="#{Math.round(val * 100) / 100} stars on 5">
             <t t-foreach="_.range(0, val_integer)" t-as="num">
                 <i class="fa fa-star" role="img"></i>
             </t>

addons/rating/models/rating_mixin.py

@@ -6,7 +6,7 @@ import operator
 from odoo import api, fields, models, tools
 from odoo.addons.rating.models import rating_data
 from odoo.osv import expression
-from odoo.tools.float_utils import float_compare
+from odoo.tools.float_utils import float_compare, float_round
 
 
 class RatingMixin(models.AbstractModel):
@@ -224,17 +224,19 @@ class RatingMixin(models.AbstractModel):
         base_domain = expression.AND([self._rating_domain(), [('rating', '>=', 1)]])
         if domain:
             base_domain += domain
-        data = self.env['rating.rating'].read_group(base_domain, ['rating'], ['rating', 'res_id'])
+        rg_data = self.env['rating.rating'].read_group(base_domain, ['rating'], ['rating', 'res_id'])
         # init dict with all posible rate value, except 0 (no value for the rating)
         values = dict.fromkeys(range(1, 6), 0)
-        values.update((d['rating'], d['rating_count']) for d in data)
+        for rating_rg in rg_data:
+            rating_val_round = float_round(rating_rg['rating'], precision_digits=1)
+            values[rating_val_round] = values.get(rating_val_round, 0) + rating_rg['rating_count']
         # add other stats
         if add_stats:
             rating_number = sum(values.values())
             result = {
                 'repartition': values,
                 'avg': sum(float(key * values[key]) for key in values) / rating_number if rating_number > 0 else 0,
-                'total': sum(it['rating_count'] for it in data),
+                'total': sum(it['rating_count'] for it in rg_data),
             }
             return result
         return values

addons/website_slides/views/rating_rating_views.xml

@@ -12,7 +12,7 @@
                 <field name="partner_id"/>
                 <templates>
                     <t t-name="kanban-box">
-                        <t t-set="val_stars" t-value="record.rating.raw_value"/>
+                        <t t-set="val_stars" t-value="Math.round(record.rating.raw_value * 10) / 10"/>
                         <t t-set="val_integer" t-value="Math.floor(val_stars)"/>
                         <t t-set="val_decimal" t-value="val_stars - val_integer"/>
                         <t t-set="empty_star" t-value="5 - (val_integer + Math.ceil(val_decimal))"/>