[IMP] get partner from Document ID

models.py

@@ -4,13 +4,25 @@ class MailMailStats(models.Model):
 
     _inherit = 'mail.mail.statistics'
 
-    partner_ids = fields.Many2many('res.partner', related='mail_mail_id.recipient_ids', string='Partners')
+    partner_ids = fields.Many2many('res.partner', related='mail_mail_id.recipient_ids', string='Partners (Mail)')
 
     @api.one
-    def _get_partner_ids_text(self):
-        res = []
+    def _get_partner_id(self):
+        if self.model=='res.partner':
+            self.partner_id = self.res_id
+        else:
+            self.partner_id = None
+
+    partner_id = fields.Many2one('res.partner', compute=_get_partner_id, string='Partner (Document ID)')
+
+    @api.one
+    def _get_partners(self):
+        res = {}
         for p in self.partner_ids:
-            res.append('%s <%s>' % (p.name, p.email))
-        self.partner_ids_text = ', '.join(res)
+            res[p.id] = p
+        if self.partner_id and self.partner_id.id not in res:
+            res[self.partner_id.id] = self.partner_id
+        self.partners = ', '.join([('%s <%s>' % (p.name, p.email)) for id,p in res.items()])
+
 
-    partner_ids_text = fields.Char('Partners', compute=_get_partner_ids_text)
+    partners = fields.Char('Partners', compute=_get_partners)

views.xml

@@ -10,6 +10,12 @@
 				<xpath expr="//form" position="inside">
 					<notebook>
 						<page string="Partners">
+							<group>
+								<label for="partners" string="Partners (summary)"/>
+								<field name="partners" readonly="1" nolabel="1"/>
+								<field name="partner_id" readonly="1"/>
+							</group>
+							<label for="partner_ids"/>
 							<field name="partner_ids" readonly="1"/>
 						</page>
 					</notebook>
@@ -23,7 +29,7 @@
 			<field name="inherit_id" ref="mass_mailing.view_mail_mail_statistics_tree"/>
             <field name="arch" type="xml">
 				<xpath expr="//field[@name='mail_mail_id_int']" position="before">
-					<field name="partner_ids_text"/>
+					<field name="partners"/>
 				</xpath>
             </field>
         </record>