[ADD] estate: Server Framework 101 implementation

- Create models for properties, types, tags, and offers
- Add views: form, list, kanban, search with filters and grouped displays
- Implement business logic: compute fields, onchanges, actions (sold, cancel,
  accept, refuse), constraints (SQL and Python)
- Use field attributes: readonly, invisible, optional
- Apply UI enhancements: decorations, badges, smart buttons
- Add seller-based property listings
- Prevent deletion of properties unless in allowed states
- Restrict offer creation to higher prices than existing ones
- Add default ordering on models
- Create estate_account module to generate an invoice upon property sale

Author: Lud0do1202

estate/__init__.py

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+from . import models

estate/__manifest__.py

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+{
+    'name': 'Real Estate',
+    'version': '1.0',
+    'description': 'Real Estate Management System',
+    'summary': 'Real Estate Management System',
+    'license': 'LGPL-3',
+    'depends': ['base'],
+    'data': [
+        'security/ir.model.access.csv',
+        'views/estate_property_offer.xml',
+        'views/estate_property_tag.xml',
+        'views/estate_property_type.xml',
+        'views/estate_property.xml',
+        'views/estate_menus.xml',
+        'views/res_user.xml',
+    ],
+    'auto_install': False,
+    'application': True,
+}

estate/models/__init__.py

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

estate/models/estate_property.py

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+from dateutil.relativedelta import relativedelta
+from odoo import _, api, fields, models
+from odoo.exceptions import UserError
+
+
+class EstateProperty(models.Model):
+    _name = 'estate.property'
+    _description = 'Real estate property with offers, pricing, and availability.'
+    _order = 'id desc'
+
+    _sql_constraints = [
+        ('check_expected_price', 'CHECK(expected_price > 0)', 'Expected price must be strictly positive!'),
+        ('check_selling_price', 'CHECK(selling_price >= 0)', 'Selling price must be positive!'),
+    ]
+
+    name = fields.Char('Title', required=True)
+    description = fields.Text('Description')
+    postcode = fields.Char('Postcode')
+    date_availability = fields.Date(
+        'Availability From',
+        copy=False,
+        default=lambda self: fields.Date.today() + relativedelta(months=3),
+    )
+    expected_price = fields.Float('Expected Price', required=True)
+    selling_price = fields.Float('Selling Price', readonly=True, copy=False)
+    best_price = fields.Float('Best Price', compute='_compute_best_price', store=True)
+    property_type_id = fields.Many2one('estate.property.type', 'Property Type')
+    tag_ids = fields.Many2many('estate.property.tag', string='Tags')
+    buyer_id = fields.Many2one('res.partner', 'Buyer')
+    seller_id = fields.Many2one('res.users', 'Seller', default=lambda self: self.env.user)
+    bedrooms = fields.Integer('Bedrooms', default=2)
+    living_area = fields.Integer('Living Area (sqm)')
+    facades = fields.Integer('Facades')
+    garage = fields.Boolean('Garage')
+    garden = fields.Boolean('Garden')
+    garden_area = fields.Integer('Garden Area')
+    garden_orientation = fields.Selection(
+        [('north', 'North'), ('south', 'South'), ('east', 'East'), ('west', 'West')],
+        'Garden Orientation',
+    )
+    total_area = fields.Integer('Total Area (sqm)', compute='_compute_total_area', store=True)
+    state = fields.Selection(
+        [
+            ('new', 'New'),
+            ('offer_received', 'Offer Received'),
+            ('offer_accepted', 'Offer Accepted'),
+            ('sold', 'Sold'),
+            ('cancelled', 'Cancelled'),
+        ],
+        'State',
+        default='new',
+        required=True,
+        copy=False,
+        compute='_compute_state',
+        store=True,
+    )
+    offer_ids = fields.One2many('estate.property.offer', 'property_id', 'Offers')
+    active = fields.Boolean('Active', default=True)
+
+    ###### COMPUTE ######
+    @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.price')
+    def _compute_best_price(self):
+        for record in self:
+            prices = record.offer_ids.mapped('price')
+            if prices:
+                record.best_price = max(prices)
+            else:
+                record.best_price = 0.0
+
+    @api.depends('offer_ids')
+    def _compute_state(self):
+        for record in self:
+            if not record.offer_ids:
+                record.state = 'new'
+            elif record.state == 'new':
+                record.state = 'offer_received'
+
+    ###### ONCHANGE ######
+    @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
+
+    ###### CRUD ######
+    def unlink(self):
+        if any(record.state not in ['new', 'cancelled'] for record in self):
+            raise UserError(_('You cannot delete a property that is not new or cancelled.'))
+        return super().unlink()
+
+    ###### ACTION ######
+    def action_sold(self):
+        for record in self:
+            if record.state == 'sold':
+                raise UserError(_('Property is already sold.'))
+            if record.state == 'cancelled':
+                raise UserError(_('Property is cancelled and cannot be sold.'))
+            if record.state != 'offer_accepted':
+                raise UserError(_('You must accept an offer before marking the property as sold.'))
+
+            record.state = 'sold'
+        return True
+
+    def action_cancel(self):
+        for record in self:
+            if record.state == 'cancelled':
+                raise UserError(_('Property is already cancelled.'))
+            if record.state == 'sold':
+                raise UserError(_('Sold properties cannot be cancelled.'))
+
+            record.state = 'cancelled'
+        return True

estate/models/estate_property_offer.py

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+from dateutil.relativedelta import relativedelta
+from odoo import _, api, fields, models
+from odoo.exceptions import ValidationError
+from odoo.tools.float_utils import float_compare
+
+
+class EstatePropertyOffer(models.Model):
+    _name = 'estate.property.offer'
+    _description = 'An offer for a property'
+    _order = 'price desc'
+
+    _sql_constraints = [
+        ('check_price', 'CHECK(price > 0)', 'Price must be strictly positive!'),
+    ]
+
+    price = fields.Float('Price')
+    status = fields.Selection(
+        [('accepted', 'Accepted'), ('refused', 'Refused'), ('pending', 'Pending')],
+        'Status',
+        default='pending',
+        required=True,
+        copy=False,
+    )
+    partner_id = fields.Many2one('res.partner', 'Partner', required=True)
+    property_id = fields.Many2one('estate.property', 'Property', required=True)
+    property_type_id = fields.Many2one(
+        'estate.property.type',
+        'Property Type',
+        related='property_id.property_type_id',
+        store=True,
+    )
+    validity = fields.Integer('Validity (days)', help='Validity in days', default=7)
+    date_deadline = fields.Date(
+        'Deadline',
+        compute='_compute_date_deadline',
+        inverse='_inverse_date_deadline',
+        store=True,
+    )
+
+    ###### COMPUTE ######
+    @api.depends('validity')
+    def _compute_date_deadline(self):
+        for record in self:
+            if not record.validity:
+                record.date_deadline = False
+            else:
+                record.date_deadline = fields.Date.today() + relativedelta(days=record.validity)
+
+    def _inverse_date_deadline(self):
+        for record in self:
+            if not record.date_deadline:
+                record.validity = 0
+            else:
+                record.validity = (record.date_deadline - fields.Date.today()).days
+
+    ###### CRUD ######
+    @api.model_create_multi
+    def create(self, vals):
+        for val in vals:
+            val_price = val.get('price')
+            val_property_id = val.get('property_id')
+            if not val_price or not val_property_id:
+                raise ValidationError(_('Price and Property ID are required.'))
+            property_id = self.env['estate.property'].browse(val_property_id)
+            if not property_id:
+                raise ValidationError(_(f'Property with ID {val_property_id} does not exist.'))
+            best_price = property_id.best_price
+            if float_compare(val_price, best_price, precision_digits=2) <= 0:
+                raise ValidationError(_(f'The offer price must be higher than the current best price (${best_price}).'))
+        return super().create(vals)
+
+    ###### ACTIONS ######
+    def action_accept(self):
+        for record in self:
+            record.status = 'accepted'
+            record.property_id.selling_price = record.price
+            record.property_id.buyer_id = record.partner_id
+            record.property_id.state = 'offer_accepted'
+
+            other_offers = record.property_id.offer_ids.filtered(lambda x: x.id != record.id)
+            other_offers.action_refuse()
+        return True
+
+    def action_refuse(self):
+        for record in self:
+            record.status = 'refused'
+        return True
+
+    def action_revert(self):
+        for record in self:
+            if record.status == 'accepted':
+                record.property_id.state = 'offer_received'
+                record.property_id.buyer_id = False
+                record.property_id.selling_price = 0
+            record.status = 'pending'
+        return True
+
+    ###### CONSTRAINTS ######
+    @api.constrains('price')
+    def _check_price(self):
+        for record in self:
+            min_offer_price = record.property_id.expected_price * 0.9
+            if float_compare(record.price, min_offer_price, precision_digits=2) < 0:
+                raise ValidationError(
+                    _(f'The offer price must be at least 90% of the expected price (${min_offer_price}).')
+                )

estate/models/estate_property_tag.py

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+from random import randint
+
+from odoo import fields, models
+
+
+class EstatePropertyTag(models.Model):
+    _name = 'estate.property.tag'
+    _description = 'Tag for categorizing estate properties'
+    _order = 'name asc'
+
+    _sql_constraints = [
+        ('unique_name', 'UNIQUE(name)', 'Tag name must be unique!'),
+    ]
+
+    def _get_default_color(self):
+        return randint(1, 11)
+
+    name = fields.Char('Name', required=True)
+    color = fields.Integer('Color', default=_get_default_color)

estate/models/estate_property_type.py

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+from odoo import api, fields, models
+
+
+class EstatePropertyType(models.Model):
+    _name = 'estate.property.type'
+    _description = 'Type for categorizing estate properties'
+    _order = 'name asc'
+
+    _sql_constraints = [
+        ('unique_name', 'UNIQUE(name)', 'Type name must be unique!'),
+    ]
+
+    sequence = fields.Integer('Sequence', default=10)
+    name = fields.Char('Name', required=True)
+    property_ids = fields.One2many('estate.property', 'property_type_id', 'Properties')
+    offer_ids = fields.One2many('estate.property.offer', 'property_type_id', 'Offers')
+    offer_count = fields.Integer('Offers Count', compute='_compute_offer_count')
+
+    @api.depends('offer_ids')
+    def _compute_offer_count(self):
+        for record in self:
+            record.offer_count = len(record.offer_ids)

estate/models/res_users.py

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+from odoo import fields, models
+
+
+class ResUsers(models.Model):
+    _inherit = 'res.users'
+
+    property_ids = fields.One2many(
+        'estate.property',
+        'seller_id',
+        'Properties',
+        domain=[('state', 'in', ['new', 'offer_received'])],
+    )

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_tag,access_estate_property_tag,estate.model_estate_property_tag,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_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="real_estate_root_menu" name="Real Estate">
+        <menuitem id="advertissements_menu" name="Advertissements" sequence="10">
+            <menuitem id="advertissements_property_menu" name="Properties" action="estate_property_action" sequence="10"/>
+        </menuitem>
+
+        <menuitem id="settings_menu" name="Settings" sequence="20">
+            <menuitem id="settings_property_types_menu" name="Property Types" action="estate_property_types_action" sequence="10"/>
+            <menuitem id="settings_property_tags_menu" name="Property Tags" action="estate_property_tags_action" sequence="20"/>
+        </menuitem>
+    </menuitem>
+</odoo>