[IMP] estate: added computed fields, onchanges, error handling, const…

…raints, and inverse methods

Day 4:
- Implemented computed field total_area as the sum of
  living_area and garden_area in estate.property.
- Added total_area to estate_property_views.xml.
- Used computed field with mapped() to define best_price as
  the maximum offer price in estate.property.
- Added inverse method for date_deadline in estate.property.offer
  - date_deadline is computed as create_date + validity days.
  - Implemented inverse method to update validity based on date_deadline.
- Added onchange method to auto-set garden_area (10) and
  orientation (North) when garden is True, and reset values
  when unset.
- Implemented property state transitions: added functionality to
  cancel and mark a property as sold.
- Used UserError for validation and error handling in business logic.
- Applied SQL constraints:
  - estate.property: applied expected_price > 0, selling_price ≥ 0.
  - estate.property.offer: applied offer_price > 0.
  - Implemented unique constraints on estate.property.tag and
    estate.property.type names.
- Implemented Python constraint in estate.property to ensure
  selling_price is at least 90% of expected_price.

estate/models/__init__.py

@@ -1,6 +1,6 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
-from . import estate_property 
+from . import estate_property
 from . import estate_property_type
 from . import estate_property_tag
 from . import estate_property_offer

estate/models/estate_property.py

@@ -1,11 +1,24 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
-from odoo import fields, models
+from odoo import api, fields, models
+from odoo.exceptions import UserError, ValidationError
 
 
 class EstateProperty(models.Model):
     _name = "estate.property"
-    _description = "Properties involved in estate"
+    _description = "Properties/Advertisements created and managed in estate"
+    _sql_constraints = [
+        (
+            "check_expected_price",
+            "CHECK(expected_price > 0)",
+            "The expected price must be strictly positive.",
+        ),
+        (
+            "check_selling_price",
+            "CHECK(selling_price >= 0)",
+            "The selling price must be positive.",
+        ),
+    ]
 
     name = fields.Char(string="Name of the property", required=True)
     description = fields.Text(string="Property Description")
@@ -31,6 +44,7 @@ class EstateProperty(models.Model):
             ("west", "West"),
         ]
     )
+    total_area = fields.Float(compute="_compute_total_area")
     active = fields.Boolean(default=True)
     state = fields.Selection(
         selection=[
@@ -49,8 +63,58 @@ class EstateProperty(models.Model):
     tag_ids = fields.Many2many("estate.property.tag", string="Tags")
     offer_ids = fields.One2many("estate.property.offer", "property_id", string="Offers")
     salesperson_id = fields.Many2one(
-        "res.users", string="Salesperson", default= lambda self: self.env.user, required=True
+        "res.users",
+        string="Salesperson",
+        default=lambda self: self.env.user,
+        required=True,
     )
-    buyer_id = fields.Many2one(
-        "res.partner", string="Buyer", copy = False
+    buyer_id = fields.Many2one("res.partner", string="Buyer", copy=False)
+    best_price = fields.Float(
+        compute="_compute_best_price", string="Best Offer", store=True
     )
+
+    @api.depends("living_area", "garden_area")
+    def _compute_total_area(self):
+        for record in self:
+            record.total_area = record.living_area + record.garden_area
+
+    @api.depends("offer_ids")
+    def _compute_best_price(self):
+        for record in self:
+            record.best_price = max(record.offer_ids.mapped("price"), default=0)
+
+    @api.onchange("garden")
+    def _onChange_garden(self):
+        if self.garden:
+            self.garden_area = 10
+            self.garden_orientation = "north"
+        else:
+            self.garden_area = 0
+            self.garden_orientation = False
+
+    def action_sold(self):
+        for record in self:
+            if record.state == "canceled":
+                raise UserError("Canceled property cannot be sold")
+            if not record.buyer_id or not record.selling_price:
+                raise UserError(
+                    "Property must have an accepted offer before being sold"
+                )
+            record.state = "sold"
+
+    def action_cancel(self):
+        for record in self:
+            if record.state == "sold":
+                raise UserError("Sold Property can't be canceled")
+            record.state = "canceled"
+
+    @api.constrains("selling_price", "expected_price")
+    def _check_selling_price(self):
+        for record in self:
+            if (
+                record.selling_price > 0
+                and record.selling_price < record.expected_price * 0.9
+            ):
+                raise ValidationError(
+                    "The selling price cannot be less than 90% of the expected price"
+                )

estate/models/estate_property_offer.py

@@ -1,11 +1,15 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
-from odoo import fields, models
+from odoo import api, fields, models
+from odoo.exceptions import UserError
 
 
 class EstatePropertyOffer(models.Model):
     _name = "estate.property.offer"
     _description = "Offer on property"
+    _sql_constraints = [
+        ("check_price", "CHECK(price > 0)", "Offer price must be strictly positive."),
+    ]
 
     price = fields.Float(string="Price", required=True)
     status = fields.Selection(
@@ -15,3 +19,40 @@ class EstatePropertyOffer(models.Model):
     )
     partner_id = fields.Many2one("res.partner", string="Partner", required=True)
     property_id = fields.Many2one("estate.property", string="Property", required=True)
+    validity = fields.Integer(default=7, string="Validity (days)")
+    deadline = fields.Date(
+        string="Deadline", compute="_compute_deadline", inverse="_inverse_deadline", store="True"
+    )
+
+    @api.depends("validity")
+    def _compute_deadline(self):
+        for offer in self:
+            if offer.create_date:
+                offer.deadline = fields.Date.add(offer.create_date, days=offer.validity)
+            else:
+                offer.deadline = fields.Date.today()
+
+    def _inverse_deadline(self):
+        for offer in self:
+            if offer.create_date:
+                offer.validity = (offer.deadline - offer.create_date.date()).days
+            else:
+                offer.validity = 7
+
+    def action_accept(self):
+        for offer in self:
+            if offer.property_id.state == "sold":
+                raise UserError("Offer cannot be accepted on sold property")
+            for existing_offer in offer.property_id.offer_ids:
+                if existing_offer.status == "accepted":
+                    raise UserError("Only one offer can be accepted for a property")
+            offer.status = "accepted"
+            offer.property_id.selling_price = offer.price
+            offer.property_id.buyer_id = offer.partner_id
+            offer.property_id.state = "offer_accepted"
+
+    def action_refuse(self):
+        for offer in self:
+            if offer.status == "accepted":
+                raise UserError("Accepted offer cannot be refused")
+            offer.status = "refused"

estate/models/estate_property_tag.py

@@ -1,10 +1,13 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
-from odoo import models,fields
+from odoo import models, fields
 
 
 class EstatePropertyTag(models.Model):
     _name = "estate.property.tag"
     _description = "tags attached to property"
-
-    name = fields.Char(string="Property Tag" , required=True)
+    _sql_constraints = [
+        ("unique_tag_name", "UNIQUE(name)", "Property tag name must be unique."),
+    ]
+
+    name = fields.Char(string="Property Tag", required=True)

estate/models/estate_property_type.py

@@ -6,5 +6,8 @@
 class EstatePropertyType(models.Model):
     _name = "estate.property.type"
     _description = "Real Estate Property Type"
+    _sql_constraints = [
+        ("unique_type_name", "UNIQUE(name)", "Property type name must be unique."),
+    ]
 
     name = fields.Char(string="Property Type", required=True)

estate/views/estate_property_type_views.xml

@@ -5,7 +5,7 @@
         <field name="model">estate.property.type</field>
         <field name="arch" type="xml">
             <list string="Property Types">
-                <field name="name"/>
+                <field name="name" />
             </list>
         </field>
     </record>
@@ -17,7 +17,7 @@
             <form string="Property Type">
                 <sheet>
                     <group>
-                        <field name="name"/>
+                        <field name="name" />
                     </group>
                 </sheet>
             </form>

estate/views/estate_property_views.xml

@@ -24,6 +24,10 @@
         <field name="model">estate.property</field>
         <field name="arch" type="xml">
             <form string="Property">
+                <header>
+                    <button name="action_sold" type="object" string="Sold" class="oe_highlight" />
+                    <button name="action_cancel" type="object" string="Cancel" class="oe_highlight" />
+                </header>
                 <sheet>
                     <h1>
                         <field name="name" />
@@ -33,16 +37,14 @@
                     </div>
                     <group>
                         <group>
+                            <field name="property_type_id" />
                             <field name="postcode" />
                             <field name="date_availability" />
                         </group>
                         <group>
                             <field name="expected_price" />
                             <field name="selling_price" />
-                        </group>
-                        <group>
-                            <field name="state" />
-                            <field name="property_type_id" />
+                            <field name="best_price" />
                         </group>
                     </group>
                     <notebook>
@@ -56,21 +58,26 @@
                                 <field name="garden" />
                                 <field name="garden_area" />
                                 <field name="garden_orientation" />
+                                <field name="total_area" />
                             </group>
                         </page>
                         <page string="Offers">
                             <field name="offer_ids">
                                 <list>
                                     <field name="price" />
                                     <field name="partner_id" />
+                                    <field name="validity" />
+                                    <field name="deadline" />
                                     <field name="status" />
+                                    <button name="action_accept" type="object" icon="fa-check" />
+                                    <button name="action_refuse" type="object" icon="fa-times"/>
                                 </list>
                             </field>
                         </page>
                         <page string="Other information">
                             <group>
-                                <field name="salesperson_id"/>
-                                <field name="buyer_id"/>
+                                <field name="salesperson_id" />
+                                <field name="buyer_id" />
                             </group>
                         </page>
                     </notebook>