[ADD] web_domain_field_example: Test and demo web_domain_field

web_domain_field_example/models/__init__.py

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+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+from . import product_demonstration
+from . import product_selection_example

web_domain_field_example/models/product_demonstration.py

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+# Copyright 2020 Therp BV <https://therp.nl>.
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+"""Demonstration products.
+
+We do nut use the normal product.template and product.product models because some
+odoo modules had the abhorrent idea of adding required fields to product.template,
+like sale_line_warn in the sale module. In order to make this module not dependant
+on modules that make the terrible mistake of adding required fields to models
+defined in another module, we have our own demo product model.
+"""
+
+from odoo import fields, models
+
+
+class ProductDemonstration(models.Model):
+    """Demonstration product. Just for the sake of this module."""
+    _name = "product.demonstration"
+    _description = "Products to demonstrate workings of web_domain_field module."
+
+    name = fields.Char(required=True)
+    default_code = fields.Char(required=True)
+    categ_id = fields.Many2one(
+        comodel_name="product.category",
+        required=True
+    )

web_domain_field_example/models/product_selection_example.py

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+# Copyright 2020 Therp BV <https://therp.nl>.
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+"""Demonstratie web_domain_field, making product domain dependent on category."""
+import json
+
+from odoo import api, fields, models
+
+
+class ProductSelectionExample(models.Model):
+    """Demonstratie web_domain_field, making product domain dependent on category."""
+    _name = "product.selection.example"
+    _description = "Show web_domain_field in action"
+
+    @api.multi
+    @api.depends("product_category_id")
+    def _compute_product_id_domain(self):
+        for this in self:
+            domain = (
+                [("categ_id", "=", this.product_category_id.id)]
+                if this.product_category_id
+                else []
+            )
+            this.product_id_domain = json.dumps(domain)
+
+    product_category_id = fields.Many2one(
+        comodel_name="product.category",
+        required=True
+    )
+    product_id = fields.Many2one(comodel_name="product.demonstration")
+    product_id_domain = fields.Char(
+        compute="_compute_product_id_domain",
+        readonly=True,
+        store=False,
+    )
+
+    @api.onchange("product_category_id")
+    def _onchange_product_category_id(self):
+        """Clear product_id if not in accordance with category."""
+        for this in self:
+            if (
+                    this.product_category_id
+                    and this.product_id
+                    and this.product_category_id != this.product_id.categ_id
+            ):
+                no_product = self.env["product.demonstration"].browse([])
+                this.product_id = no_product