Why I Love Odoo as a Developer?

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data>
        <record id="module_category_vehicle" model="ir.module.category">
            <field name="name">Vehicle</field>
        </record>

        <record id="group_vehicle_user" model="res.groups">
            <field name="name">User</field>
            <field name="category_id" ref="module_category_vehicle"/>
        </record>

        <record id="group_vehicle_manager" model="res.groups">
            <field name="name">Manager</field>
            <field name="category_id" ref="module_category_vehicle"/>
            <field name="implied_ids" eval="[(4, ref('group_vehicle_user'))]"/>
        </record>
​</data>
</odoo>

id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
access_vehicle_user,access_vehicle_user,model_vehicle,your_module.group_vehicle_user,1,0,0,0
access_vehicle_manager,access_vehicle_manager,model_vehicle,your_module.group_vehicle_manager,1,1,1,1
access_vehicle_user_sale_order,access_vehicle_user_sale_order,sale.model_sale_order,your_module.group_vehicle_user,1,1,1,0
access_vehicle_manager_sale_order,access_vehicle_manager_sale_order,sale.model_sale_order,your_module.group_vehicle_manager,1,1,1,1

<record model="ir.rule" id="sale_order_personal_rule">
    <field name="name">Personal Orders</field>
    <field name="model_id" ref="model_sale_order"/>
    <field name="domain_force">[('user_id', '=', user.id)]</field>
</record>

<record id="sale_order_comp_rule" model="ir.rule">
    <field name="name">Sales Order multi-company</field>
    <field name="model_id" ref="model_sale_order"/>
    <field name="domain_force">[('company_id', 'in', company_ids)]</field>
</record>

# -*- coding: utf-8 -*-

from odoo import api, fields, models
from odoo.exceptions import ValidationError


class Vehicle(models.Model):
    _name = 'vehicle'
_description = "Vehicle"

name = fields.Char()
    logo = fields.Binary()
    year_model = fields.Integer()
    date_manufactured = fields.Date()
    short_description = fields.Text()
    long_description = fields.Html()
    active = fields.Boolean(default=True)
    state = fields.Selection([('draft', 'Draft'), ('confirmed', 'Confirmed'), ('cancelled', 'Cancelled')])
    vehicle_parts = fields.Many2many("vehicle.parts")
    vehicle_services = fields.One2many("vehicle.services", "vehicle_id")

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data>
        <record id="action_vehicle" model="ir.actions.act_window">
            <field name="name">Vehicle</field>
            <field name="res_model">vehicle</field>
            <field name="view_mode">tree,form,graph,pivot</field>
        </record>

        <menuitem name="Vehicle" id="menu_root_vehicle">
            <menuitem id="menu_vehicle" name="Vehicle" action="action_vehicle"/>
        </menuitem>
    </data>
</odoo>

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data>
        <record id="vehicle_tree_view" model="ir.ui.view">
            <field name="name">vehicle.tree.view</field>
            <field name="model">vehicle</field>
            <field name="arch" type="xml">
                <tree>
                    <field name="name" />
                    <field name="year_model" />
                    <field name="short_description" />
                </tree>
            </field>
        </record>

        <record id="vehicle_form_view" model="ir.ui.view">
            <field name="name">vehicle.form.view</field>
            <field name="model">vehicle</field>
            <field name="arch" type="xml">
                <form>
                    <group>
                        <field name="name" />
                        <field name="logo" />
                        <field name="year_model" />
                        <field name="date_manufactured" />
                        <field name="short_description" />
                        <field name="long_description" />
                    </group>
                </form>
            </field>
        </record>

        <record id="vehicle_graph_view" model="ir.ui.view">
            <field name="name">vehicle.graph.view</field>
            <field name="model">vehicle</field>
            <field name="arch" type="xml">
                <graph string="Vehicle">
                    <field name="name"/>
                </graph>
            </field>
        </record>

        <record id="vehicle_pivot_view" model="ir.ui.view">
            <field name="name">vehicle.pivot.view</field>
            <field name="model">vehicle</field>
            <field name="arch" type="xml">
                <pivot string="Vehicle">
                    <field name="name" type="row"/>
                    <field name="date_manufactured" type="col"/>
                </pivot>
            </field>
        </record>
        <!-- ... -->
</data>
</odoo>

/** @odoo-module */

import { registry } from "@web/core/registry"
const { Component, onWillStart, onMounted, useState } = owl

export class VehicleClientAction extends Component {
    setup(){
        this.states = useState({
            name: "",
            logo: "",
        })

        onWillStart(()=>{

        })

        onMounted(()=>{

        })
    }
}

VehicleClientAction.template = "VehicleClientAction"
registry.category("actions").add("vehicle_client_action", VehicleClientAction)

#...​
class Vehicle(models.Model):
    _name = 'vehicle'
    _description = "Vehicle"

    #...
    vehicle_parts = fields.Many2many("vehicle.parts")
    vehicle_services = fields.One2many("vehicle.services", "vehicle_id")


class VehicleServices(models.Model):
    _name = 'vehicle.services'
    _description = "Vehicle Services"

    name = fields.Char()
    vehicle_id = fields.Many2one("vehicle")


class VehicleParts(models.Model):
    _name = 'vehicle.parts'
    _description = "Vehicle Parts"

    name = fields.Char()

def my_query(self):
    products = self.env['sale.order'].search([('id', '=', 7)]).order_line.filtered(lambda p:p.product_id.categ_id.id == 8).mapped('product_id').sorted(lambda p: p.name).mapped('name')

total_amount = fields.Float(compute="_compute_total_amount")

@api.depends('order_line.product_id.list_price')
def _compute_total_amount(self):
    for order in self:
        order.total_amount = sum(order.order_line.mapped('price_subtotal'))

class Vehicle(models.Model):
    _name = 'vehicle'
   _description = "Vehicle"
​    #...
    active = fields.Boolean(default=True)
    state = fields.Selection([('draft', 'Draft'), ('confirmed', 'Confirmed'), ('cancelled', 'Cancelled')])

    def unlink(self):
        for record in self:
            if record.state == 'confirmed':
                raise ValidationError("You can't delete confirmed vehicles. Archive it instead.")
        super(Vehicle, self).unlink()

<record id="vehicle_form_view" model="ir.ui.view">
    <field name="name">vehicle.form.view</field>
    <field name="model">vehicle</field>
    <field name="arch" type="xml">
        <form>
            <header>
                <field name="state" widget="statusbar" options="{'clickable': '1'}"/>
            </header>
            <!-- ... -->

            <field name="active" invisible="1"/>
        </form>
    </field>
</record>

# -*- coding: utf-8 -*-

from odoo import http
from odoo.http import request


class Vehicle(http.Controller):
    ​@http.route('/vehicles', auth="public", type="http", methods=['GET'], website=True)
    def vehicles(self):
        vehicles = request.env['vehicle'].search([])
        data = {
            "vehicles": vehicles
        }

        return request.render('your_module.vehicles', data)

<?xml version="1.0" encoding="UTF-8" ?>
<odoo>
<data>
     <template id="your_module.vehicles" name="Vehicles">
         <t t-call="website.layout">
            <h1>Vehicles</h1>

             <ul t-foreach="vehicles" t-as="vehicle">
                 <t t-call="your_module.vehicle_subcomponent"/>
             </ul>
         </t>
     </template>

    <template id="your_module.vehicle_subcomponent" name="Vehicle Sub Component">
        <li>
            <span t-out="vehicle.name"/> - <span t-out="vehicle.short_description"/>
        </li>
    </template>
</data>
</odoo>

@http.route('/vehicles', auth="public,user,none", type="http,json", methods=['GET','POST','DELETE'], cors="*", csrf=False, website=True)

class SaleOrder(models.Model):
    _inherit = 'sale.order'

    @api.model_create_multi
    def create(self, vals):
        res = super().create(vals)
        # inherit res values before saving to database
        return res

    def write(self, vals):
        res = super(SaleOrder, self).write(vals)
        # inherit res values before saving to database
    return res

    def unlink(self):
        res = super(SaleOrder, self).unlink()
        # check some condition before deleting the record
    return res

    total_amount = fields.Float(compute="_compute_total_amount") # new field

    @api.depends('order_line.product_id.list_price')
    def _compute_total_amount(self): # new method
    for order in self:
        order.total_amount = sum(order.order_line.mapped('price_subtotal'))

# -*- coding: utf-8 -*-

from odoo import api, fields, models


class VehicleNew(models.Model):
    """ Create new model based from existing model """

    _name = "vehicle.new"
    _inherit = "vehicle"

    added_new_field = fields.Char()

    def added_new_method(self):
        return True

<record id="sale_order_form_view_inherit" model="ir.ui.view">
    <field name="name">sale.order.form.view.inherit</field>
    <field name="model">sale.order</field>
    <field name="inherit_id" ref="sale.view_order_form"/>
    <field name="arch" type="xml">
        <xpath expr="//header" position="inside">
            <button name="my_query" type="object" string="My Query" class="border"/>
        </xpath>
    </field>
</record>

/** @odoo-module */

import { registry } from "@web/core/registry"
import { formView } from "@web/views/form/form_view"
import { FormController } from "@web/views/form/form_controller"

class VehicleFormController extends FormController {
    newButton(url){
        console.log("New Button")
    }
}

VehicleFormController.template = "VehicleFormView"

export const vehicleFormView = {
    ...formView,
    Controller: VehicleFormController,
}

registry.category("views").add("vehicle_form_view", vehicleFormView)

<?xml version="1.0" encoding="UTF-8" ?>
<templates>
    <t t-name="VehicleFormView" t-inherit="web.FormView" owl="1">
        <xpath expr="//button[hasclass('o_form_button_create')]" position="after">
            <button class="btn btn-primary" t-on-click="newButton">New Button</button>
        </xpath>
    </t>
</templates>

<record id="vehicle_form_view" model="ir.ui.view">
    <field name="name">vehicle.form.view</field>
    <field name="model">vehicle</field>
    <field name="arch" type="xml">
        <form js_class="vehicle_form_view">
            <header>
                <field name="state" widget="statusbar" options="{'clickable': '1'}"/>
            </header>
            <!-- ... -->
        </form>
    </field>
</record>

<?xml version="1.0" encoding="UTF-8" ?>
<odoo>
    <template id="your_custom_snippet" name="Your Custom Snippet">
        <section>
            <div class="container">
                <div class="row">
                    <div class="col">
                        <h1 class="py-5">This is my custom snippet</h1>
                    </div>
                </div>
            </div>
        </section>
    </template>

    <template id="custom_snippets" inherit_id="website.snippets" name="Custom Snippets">
        <xpath expr="//div[@id='snippet_structure']" position="before">
            <div id="snippet_structure" class="o_panel">
                <div class="o_panel_header">Custom Snippets</div>
                <div class="o_panel_body">
                    <t t-snippet="your_module.your_custom_snippet" t-thumbnail="/your_module/static/src/img/snippet-icon.png">
                        <keywords>custom snippet</keywords>
                    </t>
                </div>
            </div>
        </xpath>
    </template>
</odoo>

<?xml version="1.0" encoding="UTF-8" ?>
<odoo>
<data>
    <record id="action_report_vehicle" model="ir.actions.report">
        <field name="name">Vehicle</field>
        <field name="model">vehicle</field>
        <field name="report_type">qweb-pdf</field>
        <field name="report_name">your_module.report_vehicle</field>
        <field name="report_file">your_module.report_vehicle</field>
        <field name="print_report_name">(object.name)</field>
        <field name="binding_model_id" ref="model_vehicle"/>
        <field name="binding_type">report</field>
    </record>

    <template id="report_vehicle">
        <t t-call="web.html_container">
            <t t-foreach="docs" t-as="doc">
                <t t-call="web.external_layout">
                    <div class="page">
                        <h1>This is a vehicle report</h1>

                        <p t-out="doc.name"/>
                        <p t-out="other_data"/>
                    </div>
                </t>
            </t>
        </t>
    </template>

</data>
</odoo>

# -*- coding: utf-8 -*-

from odoo import api, fields, models, tools


class ReportVehiclePDF(models.AbstractModel):
    _name = 'report.your_module.report_vehicle'
    _description = 'Vehicle Report'

    @api.model
    def _get_report_values(self, docids, data=None):
        docs = self.env['vehicle'].browse(docids)

        return {
            'doc_ids': docids,
            'doc_model': 'account.move',
            'docs': docs,
            'other_data': "Add any other data you want",
        }

class ReportVehicleView(models.Model):
    _name = 'vehicle.report'
    _description = 'Vehicle Report'
    _auto = False

    name = fields.Char()
    service_id = fields.Many2one('vehicle.services')

    def init(self):
        tools.drop_view_if_exists(self.env.cr, self._table)
        self.env.cr.execute('''
            CREATE OR REPLACE VIEW %s AS (
            SELECT row_number() OVER () as id, v.name, vs.id as service_id
            FROM vehicle v LEFT JOIN vehicle_services vs on vs.vehicle_id = v.id
            )''' % (self._table,)
        )

def send_mail(self):
    self.env['mail.mail'].sudo().create({
        'email_from': self.env.user.email_formatted,
        'author_id': self.env.user.partner_id.id,
        'body_html': "body of the email",
        'subject': 'Email Subject',
        'email_to': "ajscriptmedia@gmail.com",
        'auto_delete': True,
    }).send()