feat: add computed cash_difference field to pos.session and display in tree view

__manifest__.py

@@ -5,7 +5,9 @@
     "category": "Point of Sale",
     "author": "Suherdy Yacob",
     "depends": ["point_of_sale"],
-    "data": [],
+    "data": [
+        "views/pos_session_views.xml",
+    ],
     "assets": {
         "point_of_sale.assets": [
             "pos_cash_opening_adjustment/static/src/xml/closing_popup.xml",

models/pos_session.py

@@ -43,6 +43,12 @@ class PosSession(models.Model):
         readonly=True,
         help="Difference between expected and counted cash at session closing.",
     )
+    cash_difference = fields.Monetary(
+        string="Cash Different",
+        currency_field="currency_id",
+        compute="_compute_cash_difference",
+        help="The difference between the expected cash and the counted cash.",
+    )
 
     @api.depends("opening_cash_expected", "opening_cash_counted")
     def _compute_opening_cash_difference(self):
@@ -51,6 +57,14 @@ class PosSession(models.Model):
             counted = session.opening_cash_counted or 0.0
             session.opening_cash_difference = counted - expected
 
+    @api.depends("state", "closing_cash_difference", "cash_register_difference")
+    def _compute_cash_difference(self):
+        for session in self:
+            if session.state == "closed":
+                session.cash_difference = session.closing_cash_difference or 0.0
+            else:
+                session.cash_difference = session.cash_register_difference or 0.0
+
     def action_pos_session_open(self):
         res = super().action_pos_session_open()
         for session in self:

views/pos_session_views.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <!--
+        Inherit the pos.session list/tree view to add "Cash Different" field.
+    -->
+    <record id="view_pos_session_tree_inherit" model="ir.ui.view">
+        <field name="name">pos.session.tree.inherit.cash.difference</field>
+        <field name="model">pos.session</field>
+        <field name="inherit_id" ref="point_of_sale.view_pos_session_tree"/>
+        <field name="arch" type="xml">
+            <xpath expr="//field[@name='cash_register_balance_end']" position="after">
+                <field name="cash_difference" optional="show"/>
+            </xpath>
+        </field>
+    </record>
+</odoo>