[IMP] improve the wizard for testing email, allow to search on object and to send email for real check

mail_usability/mail.py

@@ -41,3 +41,41 @@ class ResPartner(models.Model):
                 message, force_send=force_send,
                 send_after_commit=send_after_commit,
                 user_signature=user_signature)
+
+
+class TemplatePreview(models.TransientModel):
+    _inherit = "email_template.preview"
+
+    res_id = fields.Integer(compute='_compute_res_id')
+    object_id = fields.Reference(selection='_reference_models')
+
+    @api.model
+    def default_get(self, fields):
+        result = super(TemplatePreview, self).default_get(fields)
+        if result.get('model_id'):
+            model = self.env['ir.model'].browse(result['model_id'])
+            result['object_id'] = model.model
+        return result
+
+    def _reference_models(self):
+        result = self.default_get(['model_id'])
+        if result.get('model_id'):
+            model = self.env['ir.model'].browse(result['model_id'])
+            return [(model.model, model.name)]
+        else:
+            models = self.env['ir.model'].search([('state', '!=', 'manual')])
+            return [(model.model, model.name)
+                    for model in models
+                    if not model.model.startswith('ir.')]
+
+    @api.depends('object_id')
+    def _compute_res_id(self):
+        for record in self:
+            if self.object_id:
+                record.res_id = self.object_id.id
+
+    def send(self):
+        template = self.env['mail.template'].browse(
+            self._context['template_id'])
+        template.send_mail(
+            self.res_id, force_send=True, raise_exception=True)

mail_usability/mail_view.xml

@@ -19,4 +19,23 @@
     </field>
 </record>
 
+<record id="email_template_preview_form" model="ir.ui.view">
+    <field name="model">email_template.preview</field>
+    <field name="inherit_id" ref="mail.email_template_preview_form"/>
+    <field name="arch" type="xml">
+        <field name="res_id" position="attributes">
+            <attribute name="invisible">True</attribute>
+        </field>
+        <field name="res_id" position="after">
+            <field name="object_id"/>
+        </field>
+        <footer position="inside">
+            <button
+                string="Send"
+                name="send"
+                class="btn-primary"
+                type='object'/>
+        </footer>
+    </field>
+</record>
 </odoo>