[ADD] Estate: create a new module for real estate management

estate/__init__.py

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+from . import models

estate/__manifest__.py

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+{
+    'name': 'Real estate',
+    'version': '0.1',
+    'depends': ['base'],
+    'author': 'odoo SA',
+    'category': 'Finance',
+    'description': """
+    Empty real estate app for tutorial purposes
+    """,
+    'application': 'True',
+    'data': [
+        'security/ir.model.access.csv',
+        'view/estate_property_views.xml',
+        'view/estate_property_type_views.xml',
+        'view/estate_property_tag_views.xml',
+        'view/estate_property_offer_views.xml',
+        'view/estate_menus.xml',
+        'view/user_property_views.xml'
+    ],
+    'license': 'LGPL-3',
+}

estate/models/__init__.py

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+from . import estate_property, estate_property_tag, estate_property_type, estate_property_offer, user_property

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 Estate(models.Model):
+    _name = 'estate.property'
+    _description = 'It allows to manage your properties'
+    _order = 'id desc'
+
+    name = fields.Char(required=True, default='Unknown')
+    property_type_id = fields.Many2one('estate.property.type')
+    tag_ids = fields.Many2many('estate.property.tag')
+    last_seen = fields.Datetime('Last Seen', default=fields.Datetime.now)
+    description = fields.Char(required=True)
+    postcode = fields.Char()
+    date_availability = fields.Date(default=fields.Date.today() + relativedelta(months=3), copy=False)
+    active = fields.Boolean(default=True)
+    expected_price = fields.Float(required=True)
+    selling_price = fields.Float(readonly=True, copy=False)
+    best_offer = fields.Float(compute='_compute_best_offer')
+    sales_person_id = fields.Many2one('res.users', string='Salesperson', default=lambda self: self.env.user)
+    offer_ids = fields.One2many('estate.property.offer', 'property_id', string='Offer')
+    buyer_id = fields.Many2one('res.partner', string='Customer')
+    bedrooms = fields.Integer(default=2)
+    facades = fields.Integer()
+    garage = fields.Boolean()
+    garden = fields.Boolean()
+    garden_orientation = fields.Selection(
+        string='Orientation',
+        selection=[('north', 'North'), ('south', 'South'), ('east', 'East'), ('west', 'West')],
+    )
+    living_area = fields.Integer()
+    garden_area = fields.Integer()
+    total_area = fields.Float(compute='_compute_total_area')
+    state = fields.Selection(
+        string='State',
+        selection=[
+            ('new', 'New'),
+            ('offer received', 'Offer Received'),
+            ('offer accepted', 'Offer Accepted'),
+            ('sold', 'Sold'),
+            ('cancelled', 'Cancelled'),
+        ],
+        readonly=True,
+        default='new',
+    )
+
+    _sql_constraints = [
+        ('expected_price', 'CHECK(expected_price >= 0 )', 'A price should always be possitive'),
+        ('selling_price', 'CHECK(selling_price >= 0 )', 'A price should always be possitive'),
+    ]
+
+    @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.onchange('offer_ids')
+    def _onchange_offer_ids(self):
+        if self.state == 'new':
+            if len(self.offer_ids):
+                self.state = 'offer received'
+                self._origin.state = 'offer received'  # error,  didn't found the source, fix, I'm a bugfixer
+
+    @api.depends('offer_ids')
+    def _compute_best_offer(self):
+        for record in self:
+            all_price = record.offer_ids.mapped('price')
+            if all_price:
+                record.best_offer = max(all_price)
+            else:
+                record.best_offer = 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 = ''
+
+    def action_property_sold(self):
+        for record in self:
+            if record.state == 'cancelled':
+                raise UserError(self.env._('property already sold'))
+            record.state = 'sold'
+
+    def action_property_cancelled(self):
+        for record in self:
+            if record.state == 'sold':
+                raise UserError(self.env._('property already sold'))
+            record.state = 'cancelled'
+
+    @api.ondelete(at_uninstall=False)
+    def _unlink_for_state(self):
+        if self.state not in ['new', 'cancelled']:
+            raise UserError('You cannot delete an property that as is not New or cancelled')

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 UserError
+
+
+class EstateOffer(models.Model):
+    _name = 'estate.property.offer'
+    _description = 'It allows to create a new property offer'
+    _order = 'price desc'
+
+    price = fields.Float(required=True)
+    validity = fields.Integer()
+    date_deadline = fields.Date(compute='_compute_date_deadline', inverse='_inverse_date')
+    create_date = fields.Date(default=fields.Date.today(), required=True)
+    partner_id = fields.Many2one('res.partner', string='Customer')
+    property_id = fields.Many2one('estate.property', string='Property')
+    status = fields.Selection(
+        string='State',
+        selection=[
+            ('pending', 'Pending'),
+            ('accepted', 'Accepted'),
+            ('refused', 'Refused'),
+        ],
+        default='pending',
+    )
+    property_type_id = fields.Many2one(related='property_id.property_type_id')
+
+    _sql_constraints = [('price', 'CHECK(price >= 0 )', 'A price should always be possitive')]
+
+    @api.depends('create_date', 'validity')
+    def _compute_date_deadline(self):
+        for record in self:
+            record.date_deadline = (record.create_date or fields.Date.today()) + relativedelta(days=record.validity)
+
+    def _inverse_date(self):
+        for record in self:
+            record.validity = (record.date_deadline - fields.Date.today()).days
+
+    def action_accept_offer(self):
+        for record in self:
+            if record.property_id.state not in ['sold', 'cancelled']:
+                for offer in record.property_id.offer_ids:
+                    offer.status = 'refused'
+                record.status = 'accepted'
+                record.property_id.selling_price = record.price
+                record.property_id.state = 'offer accepted'
+            else:
+                raise UserError(self.env._('property already sold'))
+        return True
+
+    def action_refuse_offer(self):
+        for record in self:
+            if record.property_id.state not in ['sold', 'cancelled']:
+                if record.status == 'accepted':
+                    record.property_id.selling_price = 0
+                    record.property_id.state = 'offer received'
+            else:
+                raise UserError(self.env._('property already sold'))
+            record.status = 'refused'
+        return True
+
+    @api.model_create_multi
+    def create(self, vals_list):
+        for vals in vals_list:
+            if vals['price'] < self.env['estate.property'].browse(vals['property_id']).best_offer:
+                raise UserError('The price is lower than the best-offer')
+        return super().create(vals_list)

estate/models/estate_property_tag.py

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+from odoo import fields, models
+
+
+class EstateTags(models.Model):
+    _name = 'estate.property.tag'
+    _description = 'It allows to create a new property tag'
+    _order = 'name desc'
+
+    name = fields.Char(required=True)
+    color = fields.Integer(default=0)
+
+    _sql_constraints = [('unique_tag_by_estate_property', 'UNIQUE(name)', 'Only one name by tag')]

estate/models/estate_property_type.py

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+from odoo import api, fields, models
+
+
+class EstateType(models.Model):
+    _name = 'estate.property.type'
+    _description = 'It allows to create a new property type'
+    _order = 'sequence desc'
+
+    name = fields.Char(required=True)
+    sequence = fields.Integer('Sequence', default=1, help='Used to order properties types. Lower is better.')
+    properties_ids = fields.One2many('estate.property', 'property_type_id')
+    offer_ids = fields.One2many('estate.property.offer', 'property_type_id')
+    offer_count = fields.Integer(compute='_compute_offer_stats')
+
+    @api.depends('offer_ids')
+    def _compute_offer_stats(self):
+        for record in self:
+            record.offer_count = len(record.offer_ids) or 0

estate/models/user_property.py

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+from odoo import fields, models
+
+
+class UserProperty(models.Model):
+    _inherit = 'res.users'
+
+    property_ids = fields.One2many(
+        'estate.property', 'sales_person_id', 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
+access_estate_property,access_estate_property,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/view/estate_menus.xml

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+<odoo>
+    <menuitem id='test_menu_root' name='Estate'>
+        <menuitem id='test_first_level_menu' name='First Level'>
+            <menuitem id='test_model_menu_action' action='action_test_action'/>
+        </menuitem>
+        <menuitem id='property_type_menu' name='Settings'>
+            <menuitem id='property_type_menu_action' action='estate_property_type_action'/>
+            <menuitem id='property_tag_menu_action' action='estate_property_tag_action'/>
+            <menuitem id='property_offer_menu_action' action='estate_property_offer_action'/>
+        </menuitem>
+    </menuitem>
+</odoo>