[IMP] purchase: add global discount support on RFQ lines

purchase_discount/__init__.py

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+from . import models
+from . import wizard

purchase_discount/__manifest__.py

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+{
+    "name": "purchase discount",
+    "version": "1.0.0",
+    "depends": ["base", "purchase"],
+    "author": "Mehul Kotak",
+    "category": "Task-1",
+    "description": "This perfrom global discount in purchase",
+    "license": "LGPL-3",
+    "application": True,
+    "installable": True,
+    "data": [
+        "security/ir.model.access.csv",
+        "views/purchase_order_view.xml",
+        "wizard/purchase_order_discount.xml",
+    ],
+}

purchase_discount/models/__init__.py

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+from . import purchase_order

purchase_discount/models/purchase_order.py

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

purchase_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_order_discount,access_purchase_order_discount,model_purchase_order_discount,base.group_user,1,1,1,1

purchase_discount/views/purchase_order_view.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+    <record id="view_purchase_order_form" model="ir.ui.view">
+        <field name="name">purchase.order.view.form.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_purchase_global_discount" type="object" class="btn btn-secondary"/>
+                </div>
+            </xpath>
+        </field>
+    </record>
+</odoo>
+

purchase_discount/wizard/__init__.py

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+from . import purchase_order_discount

purchase_discount/wizard/purchase_order_discount.py

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+from odoo import models, fields, api
+from odoo.exceptions import UserError
+
+
+class PurchaseOrderDiscount(models.TransientModel):
+    _name = "purchase.order.discount"
+    _description = "apply global discount on purchase order"
+
+    discount = fields.Float()
+    discount_type = fields.Selection(
+        [("amount", "$"), ("percent", "%")], default="percent"
+    )
+    discount_percent = fields.Float(compute="_calculate_percentage")
+
+    @api.depends("discount", "discount_type")
+    def _calculate_percentage(self):
+        order = self.env["purchase.order"].browse(self.env.context.get("active_id"))
+        if self.discount_type == "percent":
+            self.discount_percent = self.discount
+        elif order.amount_untaxed != 0:
+            self.discount_percent = (self.discount * 100) / order.amount_untaxed
+        else:
+            self.discount_percent = 0
+
+    def action_apply_discount(self):
+        order = self.env["purchase.order"].browse(self.env.context.get("active_id"))
+        if self.discount_type == "percent":
+            order.order_line.write({"discount": self.discount})
+        elif order.amount_untaxed != 0:
+            order.order_line.write({"discount": 0})
+            self.discount = (self.discount * 100) / order.amount_untaxed
+            order.order_line.write({"discount": self.discount})
+        else:
+            raise UserError(
+                "Cannot apply fixed discount because Total Amount is already zero."
+            )

purchase_discount/wizard/purchase_order_discount.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+
+    <record id="sale_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>
+                <field name="discount"/>
+                <field name="discount_type" nolabel="True"/>
+                <span class="text-muted">
+    (
+                    <field name="discount_percent" nolabel="1"/>
+%
+    )
+                </span>
+                <footer>
+                    <button name="action_apply_discount" string="Apply" type="object" class="btn btn-primary"/>
+                    <button special="cancel" string="Discard" class="btn btn-secondary" data-hotkey="x"/>
+                </footer>
+            </form>
+        </field>
+    </record>
+
+</odoo>