ADD module contract_fixed_discount

contract_fixed_discount/__init__.py

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+from . import models

contract_fixed_discount/__manifest__.py

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+# License AGPL-3 - See http://www.gnu.org/licenses/agpl-3.0.html
+
+{
+    "name": "Contract Fixed Discount",
+    "version": "14.0.1.0.0",
+    "category": "Contract Management",
+    "author": "Foodles, Odoo Community Association (OCA)",
+    "maintainers": [],
+    "website": "https://github.com/OCA/contract",
+    "depends": [
+        "account_invoice_fixed_discount",
+        "contract",
+    ],
+    "data": [
+        "views/abstract_contract_line.xml",
+    ],
+    "license": "AGPL-3",
+    "installable": True,
+}

contract_fixed_discount/models/__init__.py

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+from . import contract_line

contract_fixed_discount/models/contract_line.py

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+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import _, api, fields, models
+from odoo.exceptions import ValidationError
+
+
+class ContractAbstractContractLine(models.AbstractModel):
+    _inherit = "contract.abstract.contract.line"
+
+    discount_fixed = fields.Float(
+        string="Discount (Fixed)",
+        digits="Product Price",
+        default=0.00,
+        help="Fixed amount discount.",
+    )
+
+    @api.onchange("discount")
+    def _onchange_discount(self):
+        if self.discount:
+            self.discount_fixed = 0.0
+
+    @api.onchange("discount_fixed")
+    def _onchange_discount_fixed(self):
+        if self.discount_fixed:
+            self.discount = 0.0
+
+    @api.constrains("discount", "discount_fixed")
+    def _check_only_one_discount(self):
+        for rec in self:
+            for line in rec:
+                if line.discount and line.discount_fixed:
+                    raise ValidationError(
+                        _("You can only set one type of discount per line.")
+                    )
+
+    @api.depends("quantity", "price_unit", "discount", "discount_fixed")
+    def _compute_price_subtotal(self):
+        for line in self:
+            subtotal = line.quantity * line.price_unit
+
+            if line.discount:
+                discount = line.discount / 100
+                subtotal *= 1 - discount
+            elif line.discount_fixed:
+                subtotal -= line.discount_fixed
+
+            if line.contract_id.pricelist_id:
+                cur = line.contract_id.pricelist_id.currency_id
+                line.price_subtotal = cur.round(subtotal)
+            else:
+                line.price_subtotal = subtotal
+
+
+class ContractLine(models.Model):
+    _inherit = "contract.line"
+
+    def _prepare_invoice_line(self, move_form):
+        vals = super()._prepare_invoice_line(move_form=move_form)
+        vals["discount_fixed"] = self.discount_fixed
+        return vals

contract_fixed_discount/readme/CONTRIBUTORS.rst

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+* `Foodles <https://www.foodles.co>`_:
+
+  * Damien Crier <damien.crier@foodles.co>
+  * Pierre Verkest <pierreverkest84@gmail.com>

contract_fixed_discount/readme/DESCRIPTION.rst

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+This module extends the functionality of contracts to allow you to apply fixed amount discounts at contract line level.

contract_fixed_discount/views/abstract_contract_line.xml

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+<?xml version="1.0" encoding="utf-8" ?>
+<odoo>
+    <!--FORM view-->
+    <record
+        id="contract_abstract_contract_line_add_discount_fixed_form_view"
+        model="ir.ui.view"
+    >
+        <field
+            name="name"
+        >contract.abstract.contract.line form view (in contract)</field>
+        <field name="model">contract.abstract.contract.line</field>
+        <field
+            name="inherit_id"
+            ref="contract.contract_abstract_contract_line_form_view"
+        />
+
+        <field name="arch" type="xml">
+            <field name="discount" position="after">
+                <field name="discount_fixed" optional="hide" />
+            </field>
+        </field>
+    </record>
+</odoo>

setup/contract_fixed_discount/odoo/addons/contract_fixed_discount

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+../../../../contract_fixed_discount

setup/contract_fixed_discount/setup.py

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+import setuptools
+
+setuptools.setup(
+    setup_requires=['setuptools-odoo'],
+    odoo_addon=True,
+)