[ADD] estate: add new real estate module

Framework 101 tutorial
- add estate module
- add estate_account module for integration with invoicing

Author: robal-odoo

estate/__init__.py

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+from . import models

estate/__manifest__.py

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+{
+    "name": "Real Estate",
+    "description": "Real Estate Advertising",
+    "author": "Odoo S.A.",
+    "license": "LGPL-3",
+    "depends": ["base"],
+    "application": True,
+    "data": [
+        "security/ir.model.access.csv",
+
+        "views/estate_property_views.xml",
+        "views/estate_property_offer_views.xml",
+        "views/estate_property_type_views.xml",
+        "views/estate_property_tag_views.xml",
+        "views/estate_menus.xml",
+        "views/res_users_views.xml",
+    ],
+}

estate/models/__init__.py

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+from . import estate_property_offer
+from . import estate_property_tag
+from . import estate_property_type
+from . import estate_property
+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, ValidationError
+from odoo.tools.float_utils import float_compare, float_is_zero
+
+
+class EstateProperty(models.Model):
+    _name = "estate.property"
+    _description = "Estate property"
+    _order = "id desc"
+
+    name = fields.Char(string="Title", required=True)
+    description = fields.Text()
+    postcode = fields.Char()
+    date_availability = fields.Date(string="Available From", default=lambda self: fields.Date.context_today(self) + relativedelta(months=3), copy=False)
+    expected_price = fields.Float(required=True)
+    selling_price = fields.Float(readonly=True, copy=False)
+    bedrooms = fields.Integer(default=2)
+    living_area = fields.Integer(string="Living Area (sqm)")
+    facades = fields.Integer()
+    garage = fields.Boolean()
+    garden = fields.Boolean()
+    garden_area = fields.Integer(string="Garden Area (sqm)")
+    garden_orientation = fields.Selection(
+        selection=[("north", "North"), ("south", "South"), ("east", "East"), ("west", "West")],
+    )
+
+    # Reserved fields
+    active = fields.Boolean(default=True)
+    state = fields.Selection(
+        required=True,
+        selection=[("new", "New"), ("offer_received", "Offer Received"), ("offer_accepted", "Offer Accepted"), ("sold", "Sold"), ("cancelled", "Cancelled")],
+        default="new",
+        copy=False,
+        string="Status",
+    )
+
+    # Relations
+    property_type_id = fields.Many2one("estate.property.type", string="Property Type")
+    salesman_id = fields.Many2one("res.users", default=lambda self: self.env.user)
+    buyer_id = fields.Many2one("res.partner", copy=False)
+    tag_ids = fields.Many2many("estate.property.tag")
+    offer_ids = fields.One2many("estate.property.offer", "property_id")
+
+    # Computed
+    total_area = fields.Integer(compute="_compute_total_area", string="Total Area (sqm)")
+    best_price = fields.Float(compute="_compute_best_price", string="Best Offer")
+
+    @api.depends("living_area", "garden_area")
+    def _compute_total_area(self) -> None:
+        for record in self:
+            record.total_area = record.living_area + record.garden_area
+
+    @api.depends("offer_ids.price")
+    def _compute_best_price(self) -> None:
+        for record in self:
+            record.best_price = max(record.offer_ids.mapped("price"), default=0)
+
+    # Methods that trigger on changes
+    @api.onchange("garden")
+    def _onchange_garden_defaults(self) -> None:
+        if self.garden:
+            self.garden_area = 10
+            self.garden_orientation = "north"
+        else:
+            self.garden_area = None
+            self.garden_orientation = None
+
+    @api.ondelete(at_uninstall=False)
+    def _unlink_except_new_or_cancelled(self) -> None:
+        if any(record.state not in {"new", "cancelled"} for record in self):
+            raise UserError(self.env._("Cannot delete properties unless they are new or cancelled."))
+
+    # Public methods
+    def action_set_sold(self) -> bool:
+        for record in self:
+            if record.state == "sold":
+                continue
+
+            if record.state == "cancelled":
+                raise UserError(record.env._("Cancelled properties cannot be sold."))
+
+            record.state = "sold"
+        return True
+
+    def action_set_cancelled(self) -> bool:
+        for record in self:
+            if record.state == "cancelled":
+                continue
+
+            if record.state == "sold":
+                raise UserError(record.env._("Sold properties cannot be cancelled."))
+
+            record.state = "cancelled"
+        return True
+
+    # Constraints
+    _check_expected_price_strict_positive = models.Constraint(
+        "CHECK(expected_price > 0)",
+        "A property's expected price must be strictly greater than 0.",
+    )
+
+    _check_selling_price_positive = models.Constraint(
+        "CHECK(selling_price >= 0)",
+        "A property's selling price must be equal to or greater than 0.",
+    )
+
+    @api.constrains("expected_price", "selling_price")
+    def _check_selling_price_percentage(self) -> None:
+        for record in self:
+            # Selling price is zero when no offer has been accepted
+            if not float_is_zero(record.selling_price, precision_digits=2) and float_compare(record.selling_price, 0.9 * record.expected_price, precision_digits=2) < 0:
+                raise ValidationError(record.env._("A property's selling price cannot be lower than 90 percent of its expected price."))

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
+from odoo.tools.float_utils import float_compare
+
+
+class EstatePropertyOffer(models.Model):
+    _name = "estate.property.offer"
+    _description = "Estate property offer"
+    _order = "price desc"
+
+    price = fields.Float()
+    status = fields.Selection(
+        selection=[("accepted", "Accepted"), ("refused", "Refused")],
+        copy=False,
+    )
+    validity = fields.Integer(default=7, string="Validity (days)")
+
+    # Relations
+    partner_id = fields.Many2one("res.partner", required=True)
+    property_id = fields.Many2one("estate.property", required=True)
+    property_type_id = fields.Many2one(related="property_id.property_type_id", store=True)
+
+    # Computed
+    date_deadline = fields.Date(compute="_compute_deadline", inverse="_inverse_deadline", string="Deadline")
+
+    @api.depends("create_date", "validity")
+    def _compute_deadline(self) -> None:
+        for record in self:
+            ref_date = fields.Date.context_today(self) if not record.create_date else record.create_date.date()
+            record.date_deadline = ref_date + relativedelta(days=record.validity)
+
+    def _inverse_deadline(self) -> None:
+        for record in self:
+            ref_date = fields.Date.context_today(self) if not record.create_date else record.create_date.date()
+            record.validity = (record.date_deadline - ref_date).days
+
+    # CRUD overrides
+    @api.model
+    def create(self, vals):
+        for val in vals:
+            estate_property = self.env["estate.property"].browse(val["property_id"])
+            best_price = estate_property.best_price or 0.0
+            if float_compare(val["price"], best_price, precision_digits=2) < 0:
+                raise UserError(self.env._("A new offer must match or exceed the price of the current best offer."))
+            estate_property.state = "offer_received"
+        return super().create(vals)
+
+    # Public methods
+    def action_accept(self) -> bool:
+        # TODO double check validation
+        for record in self:
+            if record.property_id.offer_ids.filtered(lambda r: r.status == "accepted"):
+                raise UserError(record.env._("Cannot accept this offer because another offer has already been accepted for the property."))
+
+            record.status = "accepted"
+            record.property_id.selling_price = record.price
+            record.property_id.buyer_id = record.partner_id
+            record.property_id.state = "offer_accepted"
+        return True
+
+    def action_refuse(self) -> bool:
+        # TODO double check validation
+        for record in self:
+            record.status = "refused"
+        return True
+
+    # Constraints
+    _check_price_strict_positive = models.Constraint(
+        "CHECK(price > 0)",
+        "An offer's price must be strictly greater than 0.",
+    )

estate/models/estate_property_tag.py

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+from odoo import fields, models
+
+
+class EstatePropertyTag(models.Model):
+    _name = "estate.property.tag"
+    _description = "Estate property tag"
+    _order = "name"
+
+    name = fields.Char(required=True)
+    color = fields.Integer()
+
+    # Constraints
+    _uniq_name = models.Constraint(
+        "UNIQUE(name)",
+        "A property tag's name must be unique.",
+    )

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 = "Estate property type"
+    _order = "name"
+
+    name = fields.Char(required=True)
+    sequence = fields.Integer(default=1)
+
+    # Relations
+    property_ids = fields.One2many("estate.property", "property_type_id")
+    offer_ids = fields.One2many("estate.property.offer", "property_type_id")
+
+    # Computed
+    offer_count = fields.Integer(compute="_compute_offer_count")
+
+    @api.depends("offer_ids")
+    def _compute_offer_count(self) -> None:
+        for record in self:
+            record.offer_count = len(record.offer_ids)
+
+    # Constraints
+    _uniq_name = models.Constraint(
+        "UNIQUE(name)",
+        "A property type's name must be unique.",
+    )

estate/models/res_users.py

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+from odoo import fields, models
+
+
+class User(models.Model):
+    _inherit = "res.users"
+
+    property_ids = fields.One2many("estate.property", "salesman_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
+access_estate_property_type,access_estate_property_type,model_estate_property_type,base.group_user,1,1,1,1
+access_estate_property_tag,access_estate_property_tag,model_estate_property_tag,base.group_user,1,1,1,1
+access_estate_property_offer,access_estate_property_offer,model_estate_property_offer,base.group_user,1,1,1,1

estate/views/estate_menus.xml

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+<?xml version="1.0"?>
+<odoo>
+    <menuitem id="estate_menu_root" name="Real Estate">
+        <menuitem id="estate_property_menu" name="Properties">
+            <menuitem id="estate_property_menu_action" action="estate_property_action"/>
+        </menuitem>
+        <menuitem id="estate_settings_menu" name="Settings">
+            <menuitem id="estate_property_type_menu" action="estate_property_type_action"/>
+            <menuitem id="estate_property_tag_menu" action="estate_property_tag_action"/>
+        </menuitem>
+    </menuitem>
+</odoo>