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.")

    # Dynamic field editor
    field_id = fields.Many2one(
        'ir.model.fields', string="Field",
        help="""Select target field from the related document model. If it is a
         relationship field you will be able to select a target field at the
         destination of the relationship.""")
    sub_object_id = fields.Many2one(
        'ir.model', string="Sub-model",
        help="""When a relationship field is selected as first field, this
         field shows the document model the relationship goes to.""")
    sub_model_object_field_id = fields.Many2one(
        'ir.model.fields', string="Sub-field",
        help="""When a relationship field is selected as first field, this
         field lets you select the target field within the destination document
          model (sub-model).""")
    default_value = fields.Char(
        string="Default Value",
        help="Optional value to use if the target field is empty.")
    copyvalue = fields.Char(
        string="Placeholder Expression",
        help="""Final placeholder expression, to be copy-pasted in the desired
         template field.""")

    @api.onchange('field_id')
    def onchange_sub_object_id(self):
        if self.field_id:
            self.sub_object_id = self.env['ir.model'].search(
                [('model', '=', self.field_id.relation)])[0]

    @api.onchange('sub_model_object_field_id', 'default_value')
    def onchange_copyvalue(self):
        if self.sub_model_object_field_id or self.default_value:
            self.copyvalue = "${object.%s.%s or %s}" % \
                             (self.field_id.name,
                              self.sub_model_object_field_id.name,
                              self.default_value or '\'\'')

    # 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