class_docstr: Task instance schema.
code: def get_attribute(self, obj, attr, default):
      if attr == "sla_miss":
          # Object is a tuple of task_instance and slamiss
          # and the get_value expects a dict with key, value
          # corresponding to the attr.
          slamiss_instance = {"sla_miss": obj[1]}
          return get_value(slamiss_instance, attr, default)
      elif attr == "rendered_fields":
          return get_value(
              obj[0],
              "rendered_task_instance_fields.rendered_fields",
              default,
          )
      return get_value(obj[0], attr, default)
  
imports: from __future__ import annotations
  from typing import TYPE_CHECKING, NamedTuple
  from marshmallow import Schema, ValidationError, fields, validate, validates_schema
  from marshmallow.utils import get_value
  from marshmallow_sqlalchemy import SQLAlchemySchema, auto_field
  from airflow.api_connexion.parameters import validate_istimezone
  from airflow.api_connexion.schemas.common_schema import JsonObjectField
  from airflow.api_connexion.schemas.enum_schemas import TaskInstanceStateField
  from airflow.api_connexion.schemas.job_schema import JobSchema
  from airflow.api_connexion.schemas.sla_miss_schema import SlaMissSchema
  from airflow.api_connexion.schemas.trigger_schema import TriggerSchema
  from airflow.models import TaskInstance
  from airflow.utils.helpers import exactly_one
  from airflow.utils.state import TaskInstanceState
label_desc: Use image node_id 1 for calling the TaskInstanceSchema obj's underlying member method code with example usage: obj.get_attribute(obj, attr, default) and returns: get_value, get_value, get_value