[ADD] : Creation of the new module

estate/__init__.py

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+from . import models

estate/__manifest__.py

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+{
+    'name': 'Real Estate',
+    'version': '1.0',
+    'depends': ['base'],
+    'application': True,
+    'installable': True,
+    'data': [
+        'security/ir.model.access.csv',
+        'views/estate_property_views.xml',
+        'views/estate_property_type_views.xml',
+        'views/estate_property_tag_views.xml',
+        'views/estate_property_offer_views.xml',
+        'views/estate_menu.xml',
+    ],
+    'author': 'macai',
+    'license': 'LGPL-3',
+}

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

estate/models/estate_property.py

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+from odoo import models, fields, api
+from odoo.exceptions import UserError
+from odoo.tools import float_is_zero
+from odoo.tools.float_utils import float_compare
+
+
+class EstateProperty(models.Model):
+    _name = 'estate.property'
+    _description = 'Real Estate property model'
+
+#   Property information
+    name = fields.Char('Name', required=True)
+    description = fields.Text('Description')
+    postcode = fields.Char('Postcode', required=True)
+    date_availability = fields.Date('Availability', copy=False, default=lambda self: fields.Date.add(fields.Date.today(), months=3))
+    expected_price = fields.Float('Expected Price', required=True)
+    selling_price = fields.Float('Selling Price', readonly=True, copy=False)
+    bedrooms = fields.Integer('Bedrooms', default=2)
+    living_area = fields.Integer('Living Area')
+    facades = fields.Integer('Facades')
+    has_garage = fields.Boolean('Garage')
+    has_garden = fields.Boolean('Garden')
+    garden_area = fields.Integer('Garden Area')
+    garden_orientation = fields.Selection(
+        string='Garden Orientation',
+        selection=[('north', 'North'),
+                   ('south', 'South'),
+                   ('east', 'East'),
+                   ('west', 'West'),
+        ]
+    )
+    total_area = fields.Integer(compute='_compute_total_area', string='Total Area')
+    active = fields.Boolean('Active', default=True)
+    state = fields.Selection(
+        string='State',
+        selection=[('new', 'New'),
+                   ('offer_received', 'Offer Received'),
+                   ('offer_accepted', 'Offer accepted'),
+                   ('sold', 'Sold'),
+                   ('cancelled', 'Cancelled'),
+        ],
+        required=True,
+        copy=False,
+        default='new'
+    )
+    property_type_id = fields.Many2one("estate.property.type", string='Property Type')
+
+#   Other Information
+    salesman_id = fields.Many2one('res.users', string='Salesman', default=lambda self: self.env.user)
+    buyer_id = fields.Many2one('res.partner', string='Buyer', copy=False)
+
+#   Tags
+    tag_ids = fields.Many2many('estate.property.tag', string='Tags')
+
+#   Offers
+    offer_ids = fields.One2many('estate.property.offer', 'property_id', string='Offer')
+    best_price = fields.Float(compute='_compute_best_price', string='Best Offer')
+
+#   Constraints:
+#   SQL:
+    _check_expected_price = models.Constraint(
+        'CHECK(expected_price > 0)',
+        'The expected price should be stricly positive.'
+    )
+    _check_selling_price = models.Constraint(
+        'CHECK(selling_price > 0)',
+        'The proporty selling price should be stricly positive.'
+    )
+
+#   Python:
+    @api.constrains('selling_price')
+    def _check_selling_price(self):
+        for record in self:
+            if not float_is_zero(record.selling_price, 2):
+                if float_compare(record.selling_price, record.expected_price, 2) == -1:
+                    raise UserError('The Selling Price must be at least 90% of the Expected Price,'
+                                    ' you must change the expected price to accepted this offer')
+
+#   Computation Fields:
+
+    @api.depends('living_area', 'garden_area')
+    def _compute_total_area(self):
+        for record in self:  # QUESTION is the for each loop here necessary ? or can I just use self ?
+            record.total_area = record.living_area + record.garden_area
+
+    @api.depends('offer_ids.price')
+    def _compute_best_price(self):
+        for record in self:
+            if len(record.offer_ids) > 0:
+                record.best_price = max(record.offer_ids.mapped('price'))
+            else:
+                record.best_price = 0.
+
+    @api.onchange('has_garden')
+    def _onchange_has_garden(self):
+        if self.has_garden:
+            self.garden_area = 10
+            self.garden_orientation = 'north'
+        else:
+            self.garden_area = None
+            self.garden_orientation = None
+
+#   Actions buttons
+    def action_cancel_property_state(self):
+        for record in self:
+            if record.state == 'cancelled':
+                raise UserError('Cancelled properties cannot be cancelled again !')
+            elif record.state == 'sold':
+                raise UserError('Sold Properties cannot be cancelled !')
+            record.state = 'cancelled'
+            return True
+        return True
+
+    def action_sell_property_state(self):
+        for record in self:
+            if record.state == 'sold':
+                raise UserError('Sold Properties cannot be sold again !')
+            elif record.state == 'cancelled':
+                raise UserError('Cancelled properties cannot be sold !')
+            record.state = 'sold'
+            return True
+        return True
+
+#   Actions :
+    def action_set_selling_offer(self, buyer, price):
+        for record in self:
+            if record.buyer_id:
+                raise UserError('An offer is already accepted for this house')
+            record.buyer_id = buyer
+            record.selling_price = price
+            return True
+        return True
+
+

estate/models/estate_property_offer.py

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+from odoo import models, fields, api
+from odoo.exceptions import UserError
+
+
+class EstatePropertyOffer(models.Model):
+    _name = 'estate.property.offer'
+    _description = 'Estate Property Offer'
+
+    price = fields.Float(string='Price')
+    status = fields.Selection([
+        ('accepted', 'Accepted'),
+        ('refused', 'Refused')
+    ], copy=False, string='Status')
+    validity = fields.Integer(string='Validity (Days)', default=7)
+    date_deadline = fields.Date(compute='_compute_date_deadline', inverse='_inverse_date_deadline', string='Deadline')
+    partner_id = fields.Many2one('res.partner', required=True, string='Partner')
+    property_id = fields.Many2one('estate.property', required=True)
+
+#   Constraints:
+    _check_price = models.Constraint(
+        'CHECK(price > 0)',
+        'The offer price should be stricty positive'
+    )
+
+#   computed fields
+
+    @api.depends('validity', 'create_date')
+    def _compute_date_deadline(self):
+        for record in self:
+            base_date = record.create_date or fields.Date.today()  # Fallback when create_date is not set yet:
+            record.date_deadline = fields.Date.add(base_date, days=record.validity)
+
+    def _inverse_date_deadline(self):
+        for record in self:
+            record.validity = (record.date_deadline - record.create_date.date()).days
+
+#   Action buttons
+
+    def action_accept_property_offer(self):
+        for record in self:
+            for properties in record.property_id:
+                properties.action_set_selling_offer(record.partner_id, record.price)
+            record.status = 'accepted'
+            return True
+        return True
+
+    def action_refuse_property_offer(self):
+        for record in self:
+            if record.status == 'accepted':
+                raise UserError('Accepted offer cannot be refused !')
+            record.status = 'refused'
+            return True
+        return True

estate/models/estate_property_tag.py

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+from odoo import models, fields
+
+
+class EstatePropertyTag(models.Model):
+    _name = 'estate.property.tag'
+    _description = 'Estate Property Tag'
+
+    name = fields.Char(string='Name', required=True)
+#   Constraints:
+    _check_unique = models.Constraint(
+        'UNIQUE (name)',
+        'The tag name must be unique'
+    )

estate/models/estate_property_type.py

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+from odoo import models, fields
+
+
+class EstatePropertyType(models.Model):
+    _name = 'estate.property.type'
+    _description = 'Define the Real Estate Property Type'
+
+    name = fields.Char(string='Name', required=True)

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_user,access.estate.property,model_estate_property,base.group_user,1,1,1,1
+access_estate_property_type_user,access.estate.property.type,model_estate_property_type,base.group_user,1,1,1,1
+access_estate_property_tag_user,access.estate.property.tag,model_estate_property_tag,base.group_user,1,1,1,1
+access_estate_property_offer_user,access.estate.property.offer,model_estate_property_offer,base.group_user,1,1,1,1

estate/views/estate_menu.xml

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+<?xml version="1.0"?>
+<odoo>
+    <menuitem id="estate_application_menu_root" name="Real Estate">
+        <menuitem id="estate_advertisement_menu" name="Advertisements" sequence="1">
+            <menuitem id="estate_menu_action" action="estate_property_action"/>
+        </menuitem>
+        <menuitem id="setting_menu" name="Settings" sequence="2">
+            <menuitem id="estate_property_type_menu_action" action="estate_property_type_action"/>
+            <menuitem id="estate_property_tag_menu_action" action="estate_property_tag_action"/>
+        </menuitem>
+    </menuitem>
+</odoo>

estate/views/estate_property_offer_views.xml

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+<?xml version="1.0"?>
+<odoo>
+
+    <record id="estate_property_offer_view_list" model="ir.ui.view">
+        <field name="name">estate.property.offer.list</field>
+        <field name="model">estate.property.offer</field>
+        <field name="arch" type="xml">
+            <list>
+                <field name="price"/>
+                <field name="partner_id"/>
+                <field name="validity"/>
+                <field name="date_deadline"/>
+                <button name="action_accept_property_offer" string="Confirm" type="object" icon="fa-check"/>
+                <button name="action_refuse_property_offer" string="Refuse" type="object" icon="fa-level-down"/>
+                <field name="status"/>
+            </list>
+        </field>
+    </record>
+
+    <record id="estate_property_offer_view_form" model="ir.ui.view">
+        <field name="name">estate.property.offer.form</field>
+        <field name="model">estate.property.offer</field>
+        <field name="arch" type="xml">
+            <form>
+                <group>
+                    <field name="price"/>
+                    <field name="partner_id"/>
+                    <field name="validity"/>
+                    <field name="date_deadline"/>
+                    <field name="status"/>
+                </group>
+            </form>
+        </field>
+    </record>
+
+</odoo>

estate/views/estate_property_tag_views.xml

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+<?xml version="1.0"?>
+<odoo>
+
+    <record id="estate_property_tag_action" model="ir.actions.act_window">
+        <field name="name">Tags</field>
+        <field name="res_model">estate.property.tag</field>
+        <field name="view_mode">list,form</field>
+    </record>
+
+</odoo>

estate/views/estate_property_type_views.xml

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+<?xml version="1.0"?>
+<odoo>
+
+    <record id="estate_property_type_action" model="ir.actions.act_window">
+        <field name="name">Property Types</field>
+        <field name="res_model">estate.property.type</field>
+        <field name="view_mode">list,form</field>
+    </record>
+
+</odoo>