19.0 Global discount on purchase - pupat

purchase_global_discount/__init__.py

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+from . import (
+    models,  # noqa : F401
+    wizard,  # noqa : F401
+)

purchase_global_discount/__manifest__.py

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+{
+    "name": "purchase_dicount",
+    "description": "Add discount button with its wizard",
+    "author": "odoo-pupat",
+    "website": "https://www.odoo.com/",
+    "category": "Purchase-custom",
+    "version": "0.1",
+    "application": True,
+    "installable": True,
+    "depends": ["purchase"],
+    "data": [
+        "security/ir.model.access.csv",
+        "views/purchase_order_views.xml",
+        "wizard/purchase_order_discount_views.xml",
+    ],
+    "assets": {},
+    "license": "LGPL-3",
+}

purchase_global_discount/models/__init__.py

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+from . import (
+    purchase_order,  # noqa: F401
+)

purchase_global_discount/models/purchase_order.py

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+from odoo import models
+
+
+class InheritedPurchaseOrder(models.Model):
+    _inherit = "purchase.order"
+
+    def action_open_discount_wizard(self):
+        self.ensure_one()
+        return {
+            "name": "Discount",
+            "type": "ir.actions.act_window",
+            "res_model": "purchase.order.discount",
+            "view_mode": "form",
+            "target": "new",
+        }

purchase_global_discount/security/ir.model.access.csv

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+id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
+access_purchase_discount_wizard,purchase.discount.wizard,model_purchase_order_discount,base.group_user,1,1,1,1

purchase_global_discount/views/purchase_order_views.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="purchase_view_form" model="ir.ui.view">
+        <field name="name">purchase.view.form.purchase.discount</field>
+        <field name="model">purchase.order</field>
+        <field name="inherit_id" ref="purchase.purchase_order_form"/>
+        <field name="arch" type="xml">
+            <xpath expr="//field[@name='order_line']" position="after">
+                <div class="d-flex justify-content-end mt-2 mb-2">
+                    <button string="Discount" name="action_open_discount_wizard" type="object" class="btn btn-secondary"/>
+                </div>
+            </xpath>
+        </field>
+    </record>
+</odoo>

purchase_global_discount/wizard/__init__.py

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+from . import purchase_order_discount  # noqa: F401

purchase_global_discount/wizard/purchase_order_discount.py

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+from odoo import api, fields, models
+from odoo.exceptions import ValidationError
+
+
+class PurchaseOrderDiscount(models.TransientModel):
+    _name = "purchase.order.discount"
+    _description = "Discount Wizard"
+
+    purchase_order_id = fields.Many2one(
+        "purchase.order",
+        default=lambda self: self.env.context.get("active_id"),
+        required=True,
+    )
+    discount_percentage = fields.Float(string="Percentage")
+    discount_type = fields.Selection(
+        selection=[
+            ("percentage", "%"),
+            ("amount", "$"),
+        ],
+        default="percentage",
+    )
+    percentage = fields.Float(compute="_compute_initial_discount")
+
+    @api.depends("discount_type", "discount_percentage")
+    def _compute_initial_discount(self):
+        if self.discount_type == "amount":
+            if self.purchase_order_id.amount_untaxed == 0:
+                raise ValidationError("No more discount possible")
+            self.percentage = (
+                self.discount_percentage * 100 / self.purchase_order_id.amount_untaxed
+            )
+        else:
+            self.percentage = self.discount_percentage
+
+    def action_apply_discount(self):
+        self.ensure_one()
+        if self.discount_type == "amount":
+            self.purchase_order_id.order_line.write(
+                {
+                    "discount": (
+                        self.discount_percentage
+                        * 100
+                        / self.purchase_order_id.amount_untaxed
+                    )
+                }
+            )
+        else:
+            self.purchase_order_id.order_line.write(
+                {"discount": self.discount_percentage}
+            )

purchase_global_discount/wizard/purchase_order_discount_views.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+
+    <record id="purchase_order_line_wizard_form" model="ir.ui.view">
+        <field name="name">purchase.order.discount.form</field>
+        <field name="model">purchase.order.discount</field>
+        <field name="arch" type="xml">
+            <form>
+                <sheet>
+
+                    <field name="discount_percentage" nolabel="1"/>
+                    <field name="discount_type" nolabel="1"/>
+                    <field name="percentage" class='text-muted' nolabel="1"/>
+                </sheet>
+                <footer>
+                    <button type="object" string="Apply" name="action_apply_discount" class="btn btn-primary"/>
+                    <button special="cancel" string="Cancel" class="btn btn-secondary"/>
+                </footer>
+            </form>
+        </field>
+    </record>
+</odoo>