[T3523] Preview communication templates on a communication that uses them

partner_communication/i18n/de_DE.po

@@ -1750,3 +1750,10 @@ msgstr "Vorschau"
 #: model:mail.template,subject:partner_communication.default_communication_template
 msgid "{{object.subject or ' '}}"
 msgstr ""
+
+#. module: partner_communication
+#. odoo-python
+#: code:addons/partner_communication/wizards/email_template_preview_view.py:0
+msgid ""
+"No communication uses this template yet. Choose one in Record to preview it."
+msgstr "Noch keine Kommunikation verwendet diese Vorlage. Wählen Sie eine unter Datensatz, um sie in der Vorschau anzuzeigen."

partner_communication/i18n/fr_CH.po

@@ -1729,3 +1729,10 @@ msgstr "aperçu"
 #: model:mail.template,subject:partner_communication.default_communication_template
 msgid "{{object.subject or ' '}}"
 msgstr "\t{{object.subject or ' '}}"
+
+#. module: partner_communication
+#. odoo-python
+#: code:addons/partner_communication/wizards/email_template_preview_view.py:0
+msgid ""
+"No communication uses this template yet. Choose one in Record to preview it."
+msgstr "Aucune communication n'utilise encore ce modèle. Choisissez-en une dans Enregistrement pour le prévisualiser."

partner_communication/i18n/it_IT.po

@@ -1725,3 +1725,10 @@ msgstr "anteprima"
 #: model:mail.template,subject:partner_communication.default_communication_template
 msgid "{{object.subject or ' '}}"
 msgstr "{{oggetto.soggetto o ' '}}"
+
+#. module: partner_communication
+#. odoo-python
+#: code:addons/partner_communication/wizards/email_template_preview_view.py:0
+msgid ""
+"No communication uses this template yet. Choose one in Record to preview it."
+msgstr "Nessuna comunicazione utilizza ancora questo modello. Sceglierne una in Record per visualizzarne l'anteprima."

partner_communication/tests/__init__.py

@@ -6,3 +6,5 @@
 #    The licence is in the file __manifest__.py
 #
 ##############################################################################
+
+from . import test_template_preview

partner_communication/tests/test_template_preview.py

@@ -0,0 +1,49 @@
+from odoo.tests.common import TransactionCase
+
+
+class TestTemplatePreview(TransactionCase):
+    """The preview of a communication template renders a communication of a
+    rule using it (T3523)."""
+
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        job_model = cls.env["ir.model"]._get("partner.communication.job")
+        cls.template = cls.env["mail.template"].create(
+            {
+                "name": "T3523 preview",
+                "model_id": job_model.id,
+                "body_html": "<p>Hello <t t-out='object.config_id.name'/></p>",
+            }
+        )
+        cls.config = cls.env.ref("partner_communication.default_communication").copy(
+            {"name": "T3523 preview rule", "email_template_id": cls.template.id}
+        )
+        cls.partner = cls.env["res.partner"].create({"name": "T3523 preview"})
+
+    def _preview(self):
+        return self.env["mail.template.preview"].create(
+            {"mail_template_id": self.template.id}
+        )
+
+    def test_preview_uses_a_communication_of_the_template(self):
+        job = self.env["partner.communication.job"].create(
+            {"partner_id": self.partner.id, "config_id": self.config.id}
+        )
+        # A newer communication of another rule
+        self.env["partner.communication.job"].create(
+            {
+                "partner_id": self.partner.id,
+                "config_id": self.env.ref(
+                    "partner_communication.default_communication"
+                ).id,
+            }
+        )
+        preview = self._preview()
+        self.assertEqual(preview.resource_ref, job)
+        self.assertFalse(preview.error_msg)
+
+    def test_preview_without_communication_says_so(self):
+        preview = self._preview()
+        self.assertFalse(preview.resource_ref)
+        self.assertTrue(preview.error_msg)

partner_communication/wizards/email_template_preview_view.py

@@ -8,37 +8,37 @@
 #
 ##############################################################################
 
-from odoo import api, fields, models
+from odoo import _, api, models
+
+JOB_MODEL = "partner.communication.job"
 
 
 class TemplatePreview(models.TransientModel):
     _inherit = "mail.template.preview"
 
-    res_id = fields.Reference(
-        selection=lambda s: s._reference_models(), default=lambda s: s._default_model()
-    )
-
-    @api.model
-    def _reference_models(self):
-        template = self.env["mail.template"].browse(self._context.get("active_id"))
-        domain = [("model", "=", template.model)]
-        models = self.env["ir.model"].search(domain)
-        result = [(model.model, model.name) for model in models]
-        return result
+    def _is_communication_template(self):
+        return self.mail_template_id.sudo().model == JOB_MODEL
 
-    @api.model
-    def _default_model(self):
-        recs = self._reference_models()
-        model = recs[0][0]
-        model_obj = self.env[model]
-        has_partner_field = hasattr(model_obj, "partner_id")
-        if has_partner_field:
-            domain = [("partner_id", "!=", False)]
-        else:
-            domain = []
-        result = model + "," + str(model_obj.search(domain, limit=1).id)
-        return result
+    @api.depends("mail_template_id")
+    def _compute_resource_ref(self):
+        """A communication template reads the objects of its own rule (e.g. a
+        registration): preview it on a communication of a rule using it, not
+        on the latest communication of any rule."""
+        res = super()._compute_resource_ref()
+        for preview in self.filtered(lambda p: p._is_communication_template()):
+            job = self.env[JOB_MODEL].search(
+                [("config_id.email_template_id", "=", preview.mail_template_id.id)],
+                limit=1,
+            )
+            preview.resource_ref = f"{JOB_MODEL},{job.id}" if job else False
+        return res
 
-    @api.onchange("res_id")
-    def on_change_res_id(self):
-        return super().on_change_res_id()
+    @api.depends("lang", "resource_ref")
+    def _compute_mail_template_fields(self):
+        res = super()._compute_mail_template_fields()
+        if self._is_communication_template() and not self.resource_ref:
+            self.error_msg = _(
+                "No communication uses this template yet. Choose one in Record "
+                "to preview it."
+            )
+        return res