Settings page can save values but does not display saved values - odoo

Question

I am trying to create a custom settings page using res.config.settings
I'm using res_config_settings_views.xml in the hr addons folder as a reference for the view.
And I'm using res_config_settings.py also in the hr addons folder as a reference for the model.
It worked I can see my custom settings page. I can save the values. But after I saved, the settings page back to its unset state.
When I look at the database, the values were saved. And I can call the value to use in my model.
Just confused why the settings page cannot display the values I saved?
Am I missing something?
# -*- coding: utf-8 -*-
from odoo import fields, models
class ResConfigSettings(models.TransientModel):
_inherit = 'res.config.settings'
president_director_id = fields.Many2one(comodel_name='hr.employee', string="President Director", readonly=False)
head_of_hr_id = fields.Many2one(comodel_name='hr.employee', string="Head of Human Resources", readonly=False)
<?xml version="1.0" encoding="utf-8"?>
<odoo>
<record id="res_config_settings_view_form" model="ir.ui.view">
<field name="name">res.config.settings.view.form.inherit.fhid_recruitment</field>
<field name="model">res.config.settings</field>
<field name="priority" eval="65"/>
<field name="inherit_id" ref="base.res_config_settings_view_form"/>
<field name="arch" type="xml">
<xpath expr="//div[hasclass('settings')]" position="inside">
<div class="app_settings_block" data-string="FHID Settings" string="FHID Settings" data-key="fhid_setting">
<h2>FHID Settings</h2>
<div class="row mt16 o_settings_container">
<div class="col-12 col-lg-6 o_setting_box">
<div class="o_setting_right_pane">
<label for="president_director_id"/>
<!-- <span class="fa fa-lg fa-building-o" title="Values set here are company-specific." role="img" aria-label="Values set here are company-specific." groups="base.group_multi_company"/> -->
<div class="row">
<div class="text-muted col-lg-8">
Set default director, ...
</div>
</div>
<div class="content-group">
<div class="mt16">
<field name="president_director_id" class="o_light_label"/>
</div>
</div>
</div>
</div>
<div class="col-12 col-lg-6 o_setting_box">
<div class="o_setting_right_pane">
<label for="head_of_hr_id"/>
<!-- <span class="fa fa-lg fa-building-o" title="Values set here are company-specific." role="img" aria-label="Values set here are company-specific." groups="base.group_multi_company"/> -->
<div class="row">
<div class="text-muted col-lg-8">
Set default manager, ...
</div>
</div>
<div class="content-group">
<div class="mt16">
<field name="head_of_hr_id"/>
</div>
</div>
</div>
</div>
</div>
</div>
</xpath>
</field>
</record>
<record id="fhid_recruitment_config_settings_action" model="ir.actions.act_window">
<field name="name">Settings Manager</field>
<field name="type">ir.actions.act_window</field>
<field name="res_model">res.config.settings</field>
<field name="view_mode">form</field>
<field name="target">inline</field>
<field name="context">{'module' : 'fhid_recruitment'}</field>
</record>
<menuitem id="fhid_recruitment_menu_configuration"
name="Settings"
parent="hr.menu_human_resources_configuration"
sequence="0"
action="fhid_recruitment_config_settings_action"
groups="base.group_system"/>
</odoo>

Answer 1

You will have to use set_values method to save the field values and then to get the value again you will have to you get_values method.
For example you have the following field in res.config.settings model:
head_of_hr_id = fields.Many2one('hr.employee', string="Head")
Now in order to save this field value after clicking the Save button you will have to use the following code:
def set_values(self):
super(ResConfigSettings, self).set_values()
set_param = self.env['ir.config_parameter'].sudo().set_param
set_param('module_name.head_of_hr_id', int(self.head_of_hr_id.id))
To get the value again in the field, use the following code:
#api.model
def get_values(self):
res = super(ResConfigSettings, self).get_values()
get_param = self.env['ir.config_parameter'].sudo().get_param
res['head_of_hr_id'] = int(get_param('module_name.head_of_hr_id'))
return res
Hope this code help you.