[ADD] estate: Manage Your Properties, Maximize Your Returns

-create new estate model
-create offer for a property and relation between properties like one2Many ,
many2Many, many2One
-create computed fields
-create action fields and action buttons for sold & cancle and offer accept &
refused
-create views for property, type, tag and offer
-create security for all the the above model

estate/__init__.py

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+from . import models

estate/__manifest__.py

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+{
+    "name": "Real_Estate",
+    "depends": ["base"],
+    "Description": "Estate Module by aneg",
+    "category": "Real Estate",
+    "license": "LGPL-3",
+    "summary": "Real_Estate module for different purpose",
+    "author": "aneg_odoo",
+    "version": "0.1",
+    "application": True,
+    "installable": True,
+    "data": [
+        "security/ir.model.access.csv",
+        "views/estate_property_offer.xml",
+        "views/estate_property_views.xml",
+        "views/estate_property_type.xml",
+        "views/estate_property_tag.xml",
+        "views/estate_menus.xml",
+        "views/res_users_view.xml",
+    ],
+}

estate/models/__init__.py

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+from . import estate_property
+from . import estate_property_type
+from . import estate_property_tag
+from . import estate_property_offer
+from . import res_users

estate/models/estate_property.py

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+from odoo import api, models, fields
+from datetime import datetime
+from dateutil.relativedelta import relativedelta
+from odoo.exceptions import UserError, ValidationError
+
+
+class estateproperty(models.Model):
+    _name = "estate.property"  #: name of the Model
+    _description = "estate_model"
+    _order = "id desc"
+
+    name = fields.Char("Title", default="Unknown")
+    myestate_model = fields.Text("Description")
+    postcode = fields.Char("Postcode")
+    date_availability = fields.Date(
+        "Available From", copy=False, default=datetime.now() + relativedelta(months=3)
+    )
+    expected_price = fields.Float("Expected Price", default=0)
+    selling_price = fields.Float("Selling Price", copy=False)
+    bedrooms = fields.Integer("Bedrooms", default=3)
+    living_area = fields.Integer("Living Area (sqm)", default=2)
+    facades = fields.Integer("Facades", default=2)
+    garage = fields.Boolean("Garage")
+    garden = fields.Boolean("Garden")
+    garden_area = fields.Integer("Garden Area (sqm)", default=0)
+    garden_orientation = fields.Selection(
+        [("north", "north"), ("south", "south"), ("east", "east"), ("west", "west")]
+    )
+    active = fields.Boolean("Active", default=True)
+    status = fields.Selection(
+        [
+            ("new", "New"),
+            ("offer received", "Offer Received"),
+            ("offer accepted", "Offer Accepted"),
+            ("sold", "Sold"),
+            ("cancelled", "Cancelled"),
+        ],
+        default="new",
+        copy=False,
+    )
+    last_seen = fields.Datetime("Last Seen", default=fields.Datetime.now)
+    property_type = fields.Many2one("estate.property.type", string="Property Type")
+    sale_id = fields.Many2one(
+        "res.users", string="Salesman", default=lambda self: self.env.user
+    )
+    Buyer_id = fields.Many2one("res.users", string="Buyer", copy=False)
+    property_tag = fields.Many2many("estate.property.tag", string="Property Tag")
+    offer_id = fields.One2many("estate.property.offer", "property_id", string="Offers")
+    total = fields.Float(compute="_compute_total", string="Total Area (sqm)")
+    best_price = fields.Float(compute="_compute_price", string="Best offer")
+
+    _sql_constraints = [
+        (
+            "check_sellingprice_expectedprice_not_negative",
+            "CHECK(selling_price >= 0.0 and expected_price >= 0.0)",
+            "The selling price and expected_price should be greater than 0.",
+        ),
+    ]
+
+    @api.depends("living_area", "garden_area")
+    def _compute_total(self):
+        for ele in self:
+            ele.total = ele.living_area + ele.garden_area
+
+    @api.depends("offer_id.price")
+    def _compute_price(self):
+        for ele in self:
+            ele.best_price = max(ele.mapped("offer_id.price"), default=0)
+
+    @api.onchange("garden")
+    def _onchange_garden(self):
+        if self.garden:
+            self.garden_area = 100
+            self.garden_orientation = "north"
+        else:
+            self.garden_area = 0
+            self.garden_orientation = None
+
+    def sold_button(self):
+        if self.status == "cancelled":
+            raise UserError("Cancelled Properties cannot be sold")
+        else:
+            self.status = "sold"
+
+    def cancel_button(self):
+        if self.status == "sold":
+            raise UserError("sold Properties cannot be cancelled")
+        else:
+            self.status = "cancelled"
+
+    @api.constrains("selling_price", "expected_price")
+    def validate_selling_price(self):
+        for record in self:
+            if (
+                record.selling_price < (0.9 * record.expected_price)
+                and record.selling_price != 0.0
+            ):
+                raise ValidationError(
+                    "the selling price cannot be lower than 90% of the expected price."
+                )
+
+    @api.ondelete(at_uninstall=False)
+    def _prevent_property_deletion(self):
+        for record in self:
+            if record.status not in ("new", "Cancelled"):
+                raise UserError("Only new and cancelled properties can be deleted")
+
+    def check_limit(self, vals):
+        self.status = "offer received"
+
+        if vals.get("price") <= self.best_price:
+            raise ValidationError("the offer must be higher than best price")

estate/models/estate_property_offer.py

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+from odoo import api, models, fields
+from datetime import date, timedelta
+
+
+class EstatePropertyOffer(models.Model):
+    _name = "estate.property.offer"
+    _description = "Estate Property Offer"
+    _order = "price desc"
+
+    price = fields.Float("Price")
+    status = fields.Selection(
+        [("Accepted", "Accepted"), ("Refused", "Refused")], readonly=True
+    )
+    partner_id = fields.Many2one("res.partner")
+    property_id = fields.Many2one("estate.property")
+    property_type_id = fields.Many2one(related="property_id.property_type", store=True)
+    validity = fields.Integer(string="Validity(days)", default=7)
+    date_deadline = fields.Date(
+        string="Deadline", compute="_compute_deadline", inverse="_inverse_deadline"
+    )
+    _sql_constraints = [
+        (
+            "check_offerprice_not_negative",
+            "CHECK(price >= 0.0)",
+            "The offer price should be greater than 0",
+        ),
+    ]
+
+    @api.depends("validity")
+    def _compute_deadline(self):
+        for ele in self:
+            if not ele.create_date:
+                ele.create_date = date.today()
+            ele.date_deadline = ele.create_date + timedelta(days=ele.validity)
+
+    def _inverse_deadline(self):
+        for ele in self:
+            ele.validity = abs((ele.date_deadline - ele.create_date.date()).days)
+
+    def action_confirm(self):
+        for record in self:
+            record.status = "Accepted"
+            record.property_id.selling_price = record.price
+
+    def action_cancel(self):
+        for record in self:
+            record.status = "Refused"
+            record.property_id.selling_price = 0
+
+    @api.model
+    def create(self, vals):
+        self.env["estate.property"].browse(vals["property_id"]).check_limit(vals)
+        return super().create(vals)

estate/models/estate_property_tag.py

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+from odoo import models, fields
+
+
+class EstatePropertyTag(models.Model):
+    _name = "estate.property.tag"
+    _description = "EstatePropertyTag"
+    _order = "name"
+
+    name = fields.Char(string="tag", required=True)
+    _sql_constraints = [
+        ("uniq_propertytag", "unique(name)", "A property tag name must be unique"),
+    ]
+    color = fields.Integer("color index")

estate/models/estate_property_type.py

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+from odoo import models, fields, api
+
+
+class EstateProperty(models.Model):
+    _name = "estate.property.type"
+    _description = "EstatePropertyType"
+    _order = "name"
+
+    name = fields.Char("Property Types", required=True)
+    _sql_constraints = [
+        ("uniq_propertytype", "unique(name)", "A property type name must be unique"),
+    ]
+    property_ids = fields.One2many("estate.property", "property_type")
+    offer_ids = fields.One2many(
+        comodel_name="estate.property.offer", inverse_name="property_type_id"
+    )
+    offer_count = fields.Integer(compute="_num_of_offers", string="Offer Count")
+    sequence = fields.Integer(
+        "Sequence", default=1, help="To manually reorder property types"
+    )
+
+    api.depends("offer_id")
+
+    def _num_of_offers(self):
+        for record in self:
+            record.offer_count = len(record.offer_ids)

estate/models/res_users.py

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+from odoo import models, fields
+from datetime import datetime
+
+
+class Resusers(models.Model):
+    _inherit = "res.users"
+    property_ids = fields.One2many(
+        "estate.property",
+        "sale_id",
+        domain=lambda self: [("date_availability", "<=", datetime.now())],
+    )

estate/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
+estate.access_estate_property,access_estate_property,estate.model_estate_property,base.group_user,1,1,1,1
+estate.access_estate_property_type,access_estate_property_type,estate.model_estate_property_type,base.group_user,1,1,1,1
+estate.access_estate_property_tag,access_estate_property_tag,estate.model_estate_property_tag,base.group_user,1,1,1,1
+estate.access_estate_property_offer,access_estate_property_offer,estate.model_estate_property_offer,base.group_user,1,1,1,1

estate/views/estate_menus.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <menuitem id="test_menu_root" name="Real Estate">
+        <menuitem id="test_first_level_menu" name="Advertisement">
+            <menuitem id="test_model_menu_action" action="test_model_action" />
+        </menuitem>
+        <menuitem id="test_second_level_menu" name="Settings">
+            <menuitem id="test_model_menu_action3" action="action_estate_property_type" />
+            <menuitem id="test_model_menu_action2" action="action_estate_property_tag" />
+        </menuitem>
+    </menuitem>
+</odoo>

estate/views/estate_property_offer.xml

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+<odoo>
+    <record id="estate_property_offer_action" model="ir.actions.act_window">
+        <field name="name">properties offer </field>
+        <field name="res_model">estate.property.offer</field>
+        <field name="view_mode">tree,form</field>
+        <field name="domain">[('property_type_id', '=', active_id)]</field>
+    </record>
+    <record id="estate_property_offer_tree_view" model="ir.ui.view">
+        <field name="name">estate.property.offer.tree.view</field>
+        <field name="model">estate.property.offer</field>
+        <field name="arch" type="xml">
+            <tree editable="top" create="1" delete="1" multi_edit="1"
+                decoration-danger="status=='Refused'"
+                decoration-success="status=='Accepted'">
+                <field name="price" />
+                <field name="partner_id" />
+                <field name="validity" />
+                <field
+                    name="date_deadline" />
+                <button name="action_confirm" type="object"
+                    icon="fa-check" title="refuse" string=""
+                    invisible="status =='Accepted' or status=='Refused'" />
+                <button
+                    name="action_cancel" type="object" icon="fa-times" title="refuse" string=""
+                    invisible="status =='Accepted' or status=='Refused'" />
+                <field name="status" optional="hide" />
+            </tree>
+        </field>
+    </record>
+</odoo>

estate/views/estate_property_tag.xml

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+<odoo>
+    <record id="action_estate_property_tag" model="ir.actions.act_window">
+        <field name="name">Property Tags</field>
+        <field name="res_model">estate.property.tag</field>
+        <field name="view_mode">tree,form</field>
+    </record>
+    <record id="estate_property_tag_tree_view" model="ir.ui.view">
+        <field name="name">estate.property.tag.tree.view</field>
+        <field name="model">estate.property.tag</field>
+        <field name="arch" type="xml">
+            <tree string="property_tags" editable="top" create="1" delete="1" multi_edit="1">
+                <field name="name" />
+            </tree>
+        </field>
+    </record>
+</odoo>

estate/views/estate_property_type.xml

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+<odoo>
+    <record id="action_estate_property_type" model="ir.actions.act_window">
+        <field name="name">Property Types</field>
+        <field name="res_model">estate.property.type</field>
+        <field name="view_mode">tree,form</field>
+    </record>
+
+    <record id="estate_property_type_tree_view" model="ir.ui.view">
+        <field name="name">state.property.type.tree.view</field>
+        <field name="model">estate.property.type</field>
+        <field name="arch" type="xml">
+            <tree string="manual odering of property types">
+                <field name="sequence" widget="handle" />
+                <field name="name" />
+            </tree>
+        </field>
+    </record>
+    <record id="estate_property_type_form_view" model="ir.ui.view">
+        <field name="name">estate.property.type.form.view</field>
+        <field name="model">estate.property.type</field>
+        <field name="arch" type="xml">
+            <form string="estate property type form">
+                <sheet>
+                    <div class="d-flex justify-content-end">
+                        <header>
+                            <button name="%(estate.estate_property_offer_action)d" type="action"
+                                class="oe_stat_button"
+                                icon="fa-money" string="Offers">
+                                <field name="offer_count" string="Offer Count" />
+                            </button>
+                        </header>
+                    </div>
+                    <div>
+                        <h1>
+                            <field name="name" />
+                        </h1>
+                        <notebook>
+                            <page string="Properties">
+                                <field name="property_ids" options='{"format": false}'>
+                                    <tree>
+                                        <field name="name" />
+                                        <field name="expected_price" />
+                                        <field name="status" />
+                                    </tree>
+                                </field>
+                            </page>
+                        </notebook>
+                    </div>
+                </sheet>
+            </form>
+        </field>
+
+    </record>
+</odoo>