[ADD] estate: Added inheritance to extend the functionality of curren…

…t model

Add business logic and view inheritance for real estate module

- Prevent deletion of properties not in 'New' or 'Canceled' state using
`ondelete`.
- Set property state to 'Offer Received' on
 offer creation and prevent creating offers with lower amounts than existing
ones.
- Add `property_ids` field to `res.users` model to list salesperson’s available
 properties.
- Extend `base.view_users_form` to display `property_ids` in a new notebook
page.

estate/__manifest__.py

@@ -12,6 +12,7 @@
         "views/estate_property_offer_view.xml",
         "views/property_type_views.xml",
         "views/property_tag.xml",
+        "views/res_users_view.xml",
         "views/real_estate_menu.xml",
     ],
     "installable": True,

estate/models/__init__.py

@@ -3,3 +3,4 @@
 from . import property_type
 from . import property_tag
 from . import property_offer
+from . import inherited_model

estate/models/estate_property.py

@@ -25,7 +25,7 @@ class MyModel(models.Model):
             ("north", "North"),
             ("south", "South"),
             ("east", "East"),
-            ("west", "West"),
+            ("offer receivedwest", "West"),
         ],
     )
     active = fields.Boolean(default=True)
@@ -125,3 +125,11 @@ def _check_selling(self):
                     raise ValidationError(
                         "selling price cannot be lower than 90% of the expected price."
                     )
+
+    @api.ondelete(at_uninstall=False)
+    def _check_state_before_delete(self):
+        for record in self:
+            if record.state not in ["new", "cancelled"]:
+                raise UserError(
+                    "You cannot delete a property that is not in 'New' or 'Canceled' state."
+                )

estate/models/inherited_model.py

@@ -0,0 +1,12 @@
+from odoo import models, fields, api
+
+
+class InheritedModel(models.Model):
+    _inherit = "res.users"
+
+    property_ids = fields.One2many(
+        "estate_property",
+        "salesman_id",
+        string="Offers",
+        domain="['|',('state', '=', 'offer received'),('state', '=', 'offer accepted')]",
+    )

estate/models/property_offer.py

@@ -1,5 +1,6 @@
 from odoo import api, models, fields
 from dateutil.relativedelta import relativedelta
+from odoo.exceptions import UserError, ValidationError
 
 
 class EstatePropertyOffer(models.Model):
@@ -15,7 +16,9 @@ class EstatePropertyOffer(models.Model):
     )
 
     partner_id = fields.Many2one("res.partner", string="Partner", required=True)
-    property_id = fields.Many2one("estate_property", string="Property", required=True)
+    property_id = fields.Many2one(
+        "estate_property", string="Property", ondelete="cascade"
+    )
     validity = fields.Integer(string="Validity (days)", default=7)
     deadline_date = fields.Date(
         string="Deadline", compute="_compute_deadline", inverse="_inverse_deadline"
@@ -56,11 +59,13 @@ def action_accepted(self):
             record.property_id.selling_price = record.price
             record.property_id.buyer_id = record.partner_id
 
-    _sql_constraints = [
-        ("price", "CHECK(price >= 0)", "A price must be strictly positive.")
-    ]
-    # @api.constrains('property_id.bedrooms')
-    # def _check_bedrooms(self):
-    #     for record in self:
-    #         if record.property_id.bedrooms < 0:
-    #             raise ValidationError("You have to set bedrooms")
+    @api.model
+    def create(self, vals):
+        property_id = vals.get("property_id")
+        property = self.env["estate_property"].browse(property_id)
+        property.state = "offer received"
+        if property.offer_ids.filtered(lambda o: o.price >= vals.get("price")):
+            raise UserError(
+                "You cannot create an offer with a lower amount than an existing offer."
+            )
+        return super().create(vals)

estate/views/res_users_view.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+<data>
+
+    <record id="res_users_view_form" model="ir.ui.view">
+        <field name="name">res.users.form.inherit.properties</field>
+        <field name="model">res.users</field>
+        <field name="inherit_id" ref="base.view_users_form"/>
+        <field name="arch" type="xml">
+            <!-- Add a new page to the notebook -->
+            <xpath expr="//notebook" position="inside">
+                <page string="Properties">
+                    <field name="property_ids">
+                        <tree string="Real Estate Properties">
+                            <field name="name" />
+                            <field name="postcode"/>
+                            <field name="property_type_id" />
+                            <field name="state"/>
+                            <field name="tag_ids" widget="many2many_tags" />
+                            <field name="bedrooms" />
+                            <field name="living_area" />
+                            <field name="selling_price" />
+                            <field name="expected_price" />
+                        </tree>
+                    </field>
+                </page>
+            </xpath>
+        </field>
+    </record>
+
+</data>
+</odoo>