odoo report track 报表中找到追踪字段

class MailThread(models.AbstractModel):
    message_ids = fields.One2many(
        'mail.message', 'res_id', string='Messages',
        domain=lambda self: [('message_type', '!=', 'user_notification')], auto_join=True)
        
class Message(models.Model):
    
    tracking_value_ids = fields.One2many(
        'mail.tracking.value', 'mail_message_id',
        string='Tracking values',
        groups="base.group_system",
        help='Tracked values are stored in a separate model. This field allow to reconstruct '
             'the tracking and to generate statistics on the model.')
             
class MailTracking(models.Model):
    _name = 'mail.tracking.value'
    _description = 'Mail Tracking Value'
    _rec_name = 'field'
    _order = 'tracking_sequence asc'

    field = fields.Many2one('ir.model.fields', required=True, readonly=1, ondelete='cascade')
    field_desc = fields.Char('Field Description', required=True, readonly=1)
    field_type = fields.Char('Field Type')
    field_groups = fields.Char(compute='_compute_field_groups')

    old_value_integer = fields.Integer('Old Value Integer', readonly=1)
    old_value_float = fields.Float('Old Value Float', readonly=1)
    old_value_monetary = fields.Float('Old Value Monetary', readonly=1)
    old_value_char = fields.Char('Old Value Char', readonly=1)
    old_value_text = fields.Text('Old Value Text', readonly=1)
    old_value_datetime = fields.Datetime('Old Value DateTime', readonly=1)

    new_value_integer = fields.Integer('New Value Integer', readonly=1)
    new_value_float = fields.Float('New Value Float', readonly=1)
    new_value_monetary = fields.Float('New Value Monetary', readonly=1)
    new_value_char = fields.Char('New Value Char', readonly=1)
    new_value_text = fields.Text('New Value Text', readonly=1)
    new_value_datetime = fields.Datetime('New Value Datetime', readonly=1)