Criptomart/red-supermercados-coop#17 add account_invoice_triple_discount_readonly: fix write discount2 and dicount3 columns. Make discount (total) readonly

account_invoice_triple_discount_readonly/models/__init__.py

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+from . import triple_discount_mixin

account_invoice_triple_discount_readonly/models/triple_discount_mixin.py

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+from odoo import fields, models
+
+
+class TripleDiscountMixin(models.AbstractModel):
+    _inherit = "triple.discount.mixin"
+
+    # Make the discount field readonly to prevent manual edits
+    discount = fields.Float(readonly=True)
+
+    def write(self, vals):
+        discount_fields = self._get_multiple_discount_field_names()
+
+        if "discount" in vals:
+            # Check if any of discount1, discount2 or discount3
+            # are being explicitly modified
+            has_explicit_discounts = any(field in vals for field in discount_fields)
+
+            if has_explicit_discounts:
+                # If there are explicit discounts, remove the computed 'discount' field
+                # to avoid overwriting the explicit values
+                vals.pop("discount")
+            else:
+                # If only 'discount' comes, apply legacy behavior:
+                # map to discount1 and reset discount2 and discount3
+                vals["discount1"] = vals.pop("discount")
+                vals.update({field: 0 for field in discount_fields[1:]})
+
+        return super().write(vals)