feat: default variant selector — user picks which variant is the default

Added 'Default' toggle column in variant push wizard. First variant is
pre-selected as default. User can change it. The default variant's
attribute values are set as WC product's default_attributes using
WC attribute IDs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

fusion-woo-odoo/fusion_woocommerce/wizard/woo_variant_push.py

@@ -50,6 +50,7 @@ class WooVariantPushWizard(models.TransientModel):
                     attr_values = ', '.join(
                         variant.product_template_attribute_value_ids.mapped('name')
                     )
+                    is_first = len(lines) == 0
                     lines.append((0, 0, {
                         'product_id': variant.id,
                         'variant_name': variant.display_name,
@@ -60,6 +61,7 @@ class WooVariantPushWizard(models.TransientModel):
                         'cost_price': variant.standard_price,
                         'image': variant.image_variant_1920 or variant.image_1920 or False,
                         'include': True,
+                        'is_default': is_first,
                         'already_synced': bool(already_mapped),
                         'wc_variation_id': already_mapped.woo_product_id if already_mapped else 0,
                         'map_id': already_mapped.id if already_mapped else 0,
@@ -114,15 +116,21 @@ class WooVariantPushWizard(models.TransientModel):
             wc_attr_id_map[wc_attr['name'].upper()] = wc_attr['id']
 
         # Step 2: Update product as variable with attributes + set default
-        # Default attribute = first included variant's attribute values
+        # Use the variant marked as default, or first included
+        default_line = self.line_ids.filtered(lambda l: l.include and l.is_default)[:1]
+        if not default_line:
+            default_line = self.line_ids.filtered('include')[:1]
         default_attrs = []
-        first_included = self.line_ids.filtered('include')[:1]
-        if first_included and first_included.product_id:
-            for ptav in first_included.product_id.product_template_attribute_value_ids:
-                default_attrs.append({
-                    'name': ptav.attribute_id.name,
-                    'option': ptav.name,
-                })
+        if default_line and default_line.product_id:
+            for ptav in default_line.product_id.product_template_attribute_value_ids:
+                attr_name = ptav.attribute_id.name
+                wc_aid = wc_attr_id_map.get(attr_name.upper(), 0)
+                entry = {'option': ptav.name}
+                if wc_aid:
+                    entry['id'] = wc_aid
+                else:
+                    entry['name'] = attr_name
+                default_attrs.append(entry)
 
         parent_update = {
             'type': 'variable',
@@ -323,6 +331,7 @@ class WooVariantPushLine(models.TransientModel):
     cost_price = fields.Float(string='Cost', digits='Product Price')
     image = fields.Binary(string='Image', attachment=False)
     include = fields.Boolean(string='Include', default=True)
+    is_default = fields.Boolean(string='Default')
     already_synced = fields.Boolean(string='Already Synced')
     wc_variation_id = fields.Integer(string='WC Variation ID')
     map_id = fields.Integer(string='Map Record ID')

fusion-woo-odoo/fusion_woocommerce/wizard/woo_variant_push_views.xml

@@ -30,6 +30,7 @@
                     <field name="line_ids">
                         <list editable="bottom">
                             <field name="include" widget="boolean_toggle"/>
+                            <field name="is_default" string="Default" widget="boolean_toggle" force_save="1"/>
                             <field name="product_id" column_invisible="1"/>
                             <field name="variant_name" readonly="1" force_save="1"/>
                             <field name="attribute_values" readonly="1" force_save="1"/>