[ADD] estate: added constraints

Author: Wajih-Wanis

estate/models/estate_property.py

@@ -1,5 +1,6 @@
 from odoo import fields, models, api
 from odoo.exceptions import UserError
+from odoo.tools.float_utils import float_is_zero, float_compare
 from dateutil.relativedelta import relativedelta
 
 
@@ -39,6 +40,14 @@ class Estateproperty(models.Model):
     best_offer = fields.Float(compute="_compute_best_offer")
     offer_accepted = fields.Boolean()
 
+    _expected_property_price_strictly_positive = models.Constraint(
+        'CHECK(expected_price > 0)',
+    )
+
+    _property_selling_price_positive = models.Constraint(
+        'CHECK(selling_price) >= 0',
+    )
+
     @api.depends("garden_area", "living_area")
     def _compute_total_area(self):
         for record in self:
@@ -71,3 +80,10 @@ def set_property_cancelled(self):
                 record.state = 'cancelled'
             else:
                 raise(UserError("Can not cancel sold property"))
+
+    @api.onchange('selling_price', 'expected_price')
+    @api.constrains('selling_price')
+    def _check_selling_price(self):
+        for record in self:
+            if not(float_is_zero(record.selling_price,2)) and record.selling_price < 0.9 * record.expected_price:
+                raise(UserError("Selling price can not be less than 90'%' of Excpected price"))

estate/models/estate_property_offer.py

@@ -19,6 +19,10 @@ class EstatePropertyOffer(models.Model):
     validity = fields.Integer(string="Validity (days)", default=7)
     date_deadline = fields.Date(compute="_compute_date_deadline", inverse="_inverse_date_deadline")
 
+    _offer_price_strictly_positive = models.Constraint(
+        'CHECK(price > 0)',
+    )
+
     @api.depends("validity")
     def _compute_date_deadline(self):
         for record in self:

estate/models/estate_property_tag.py

@@ -7,3 +7,8 @@ class EstatePropertyTag(models.Model):
 
     name = fields.Char('Tag', required=True)
     description = fields.Char('Description')
+
+    _unique_tag = models.Constraint(
+        'UNIQUE(name)',
+        'Tag already exists'
+    )

estate/models/estate_property_type.py

@@ -7,3 +7,8 @@ class EstatePropertyType(models.Model):
 
     name = fields.Char('Type', required=True)
     description = fields.Text()
+
+    _unique_type = models.Constraint(
+        'UNIQUE(name)',
+        'Property type name exists'
+    )