oca-project/odoo-bringout-oca-project-project_template/project_template/models/project.py

# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
from odoo import api, fields, models


class Project(models.Model):
    _inherit = "project.project"

    is_template = fields.Boolean(copy=False)

    # CREATE A PROJECT FROM A TEMPLATE AND OPEN THE NEWLY CREATED PROJECT
    def create_project_from_template(self):
        if " (TEMPLATE)" in self.name:
            new_name = self.name.replace(" (TEMPLATE)", " (COPY)")
        else:
            new_name = self.name + " (COPY)"
        new_project = self.copy(
            default={"name": new_name, "active": True, "alias_name": False}
        )

        # SINCE THE END DATE DOESN'T COPY OVER ON TASKS
        # (Even when changed to copy=true), POPULATE END DATES ON THE TASK
        for new_task_record in new_project.task_ids:
            for old_task_record in self.task_ids:
                if new_task_record.name == old_task_record.name:
                    new_task_record.date_end = old_task_record.date_end

        # OPEN THE NEWLY CREATED PROJECT FORM
        return {
            "view_type": "form",
            "view_mode": "form",
            "res_model": "project.project",
            "target": "current",
            "res_id": new_project.id,
            "type": "ir.actions.act_window",
        }

    # ADD "(TEMPLATE)" TO THE NAME WHEN PROJECT IS MARKED AS A TEMPLATE
    @api.onchange("is_template")
    def on_change_is_template(self):
        # Add "(TEMPLATE)" to the Name if is_template == true
        # if self.name is needed for creating projects via configuration menu
        if self.name:
            if self.is_template:
                if "(TEMPLATE)" not in self.name:
                    self.name = self.name + " (TEMPLATE)"
                if self.user_id:
                    self.user_id = False
                if self.partner_id:
                    self.partner_id = False
                if self.alias_name:
                    self.alias_name = False

            else:
                if " (TEMPLATE)" in self.name:
                    self.name = self.name.replace(" (TEMPLATE)", "")