contract/agreement/models/agreement_appendix.py

# Copyright (C) 2018 - TODAY, Pavlov Media
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).

from odoo import api, fields, models


class AgreementAppendix(models.Model):
    _name = 'agreement.appendix'
    _description = 'Agreement Appendices'
    _order = "sequence"

    name = fields.Char(string="Name", required=True)
    title = fields.Char(string="Title", required=True,
                        help="The title is displayed on the PDF."
                             "The name is not.")
    sequence = fields.Integer(string="Sequence", default=10)
    content = fields.Html(string="Content")
    dynamic_content = fields.Html(compute="_compute_dynamic_content",
        string="Dynamic Content",
        help='compute dynamic Content')
    agreement_id = fields.Many2one('agreement', string="Agreement",
                                   ondelete="cascade")
    active = fields.Boolean(
        string="Active",
        default=True,
        help="If unchecked, it will allow you to hide this appendix without "
             "removing it.")

    # compute the dynamic content for mako expression
    @api.multi
    def _compute_dynamic_content(self):
        MailTemplates = self.env['mail.template']
        for appendix in self:
            lang = appendix.agreement_id and \
                appendix.agreement_id.partner_id.lang or 'en_US'
            content = \
            MailTemplates.with_context(lang=lang).render_template(
                appendix.content, 'agreement.appendix', appendix.id)
            appendix.dynamic_content = content