add mail_follower_option module

mail_follower_option/README.rst

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+Mail Follower Option
+====================
+
+This module ensures that the addition of followers on a model is not automatic but that it is an option on each model.
+By default, the option is unchecked on each model, so that the followers are not added.
+
+Credits
+=======
+
+Contributors
+------------
+
+* Chafique Delli (chafique.delli@akretion.com)

mail_follower_option/__init__.py

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+# -*- coding: utf-8 -*-
+
+from . import models

mail_follower_option/__manifest__.py

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+# -*- coding: utf-8 -*-
+{
+    'name': 'Mail Follower Option',
+    'version': '10.0.1.0.0',
+    'category': 'Base',
+    'license': 'AGPL-3',
+    'author': 'Akretion',
+    'website': 'http://www.akretion.com',
+    'depends': ['mail'],
+    'data': [
+        'views/ir_model_view.xml',
+    ],
+    'installable': True,
+}

mail_follower_option/models/__init__.py

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+# -*- 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

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+# -*- 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)

mail_follower_option/views/ir_model_view.xml

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+<?xml version="1.0" encoding="utf-8"?>
+
+<odoo>
+
+<record id="view_model_form" model="ir.ui.view">
+    <field name="model">ir.model</field>
+    <field name="inherit_id" ref="base.view_model_form"/>
+    <field name="arch" type="xml">
+        <field name="transient" position="after">
+            <field name="mail_follower"/>
+        </field>
+    </field>
+</record>
+
+</odoo>