Odoo : how to create a Wizard with download a file and auto close

To create a wizard in Odoo that enables file download and automatically closes upon completion, follow the steps below. The solution involves defining a wizard model, its corresponding view, and a server action to handle the file generation and download.

Steps to Create an Odoo Wizard for File Download and Auto Close
1. Define the Wizard Model
Create a new wizard model in a custom Odoo module. The wizard will handle the file download functionality.

from odoo import models, fields, api
import base64

class FileDownloadWizard(models.TransientModel):
    _name = 'file.download.wizard'
    _description = 'File Download Wizard'

    file_data = fields.Binary(string='File', readonly=True)
    file_name = fields.Char(string='File Name', readonly=True)

    def action_download_file(self):
        """Trigger file download and auto-close the wizard."""
        # Example: Generate file content dynamically
        content = "This is a sample file content generated in Odoo."
        file_data = base64.b64encode(content.encode('utf-8'))

        # Set the file data and file name
        self.file_data = file_data
        self.file_name = 'sample_file.txt'

        # Close the wizard by returning an action
        return {
            'type': 'ir.actions.act_url',
            'url': f'/web/content/{self.id}/file_data/{self.file_name}?download=true',
            'target': 'self',
        }

2. Define the Wizard View
Create an XML file for the wizard form view.

    <record id="view_file_download_wizard_form" model="ir.ui.view">
        <field name="name">file.download.wizard.form</field>
        <field name="model">file.download.wizard</field>
        <field name="arch" type="xml">
            <form string="File Download">
                <group>
                    <label string="Click 'Download' to get the file."/>
                </group>
                <footer>
                    <button string="Download" type="object" name="action_download_file" class="btn-primary"/>
                    <button string="Cancel" class="btn-secondary" special="cancel"/>
                </footer>
            </form>
        </field>
    </record>

    <record id="action_file_download_wizard" model="ir.actions.act_window">
        <field name="name">File Download Wizard</field>
        <field name="res_model">file.download.wizard</field>
        <field name="view_mode">form</field>
        <field name="target">new</field>
    </record>
</odoo>

3. Link the Wizard in Your Menu or Action
Add the action to your menu or trigger it programmatically.

    <menuitem id="menu_file_download_wizard" name="File Download Wizard"
              action="action_file_download_wizard" parent="base.menu_custom"/>
</odoo>

How This Solution Works:
Binary Field (file_data): Used to store the base64-encoded file content for download.
Dynamic Content Generation: In the action_download_file method, the file content is dynamically generated or fetched.
Auto Close: Returning an ir.actions.act_url action automatically closes the wizard after initiating the download.

By implementing this solution, you can integrate a wizard that allows downloading files in Odoo while maintaining a seamless user experience by auto-closing the dialog.
This solution demonstrates advanced features that highlight the capabilities of Odoo development services, ensuring optimal customization and user satisfaction.