add mail_follower_option module

mail_follower_option/models/__init__.py

@@ -0,0 +1,4 @@
+# -*- coding: utf-8 -*-
+
+from . import mail_follower
+from . import ir_model

mail_follower_option/models/ir_model.py

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+# -*- coding: utf-8 -*-
+
+from odoo import models, fields
+
+
+class IrModel(models.Model):
+    _inherit = 'ir.model'
+
+    mail_follower = fields.Boolean(string='Follow', default=False,
+                                   help='Check if you want create followers'
+                                        ' on this model')

mail_follower_option/models/mail_follower.py

@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+
+from odoo import models, api
+
+
+class Followers(models.Model):
+    _inherit = 'mail.followers'
+
+    @api.model
+    def create(self, vals):
+        # Do not implicitly create followers on an object
+        model = self.env['ir.model'].search([
+            ('model', '=', vals['res_model']),
+            ('mail_follower', '=', True),
+        ], limit=1)
+        if not model:
+            return
+        return super(Followers, self).create(vals)