Source code for py_gql.execution.default_resolver

# -*- coding: utf-8 -*-

from import Mapping
from typing import TYPE_CHECKING, Any

    from .wrappers import ResolveInfo

[docs]def default_resolver( root: Any, context: Any, info: "ResolveInfo", *, __isinstance: Any = isinstance, __getattr: Any = getattr, __callable: Any = callable, __mapping_cls: Any = Mapping, **args: Any ) -> Any: """ Resolve a field from dictionaries or objects. This is the default resolver used during query execution and looks up the value from the ``root`` in the following lookup order: - If ``root`` is a dict subclass: - If the field is present return it - If ``root`` has an attribute corresponding to the field name: - If the attribute is non callable, return it - If the attribute is callable, treat it like a method and return the result of calling it passing in ``(context, info, **args)``. - Return ``None``. If the field defined a custom ``python_name`` attribute, this will be used instead of the field name. As this is can be called a lot during execution, the ``__*`` type arguments are there as an optimisation. Args: root: Value of the resolved parent node. context: User provided context value. info (py_gql.execution.ResolveInfo): Resolution context. **args: Coerced field arguments. Returns: Resolved value. """ if __isinstance(root, __mapping_cls): return root.get(info.field_definition.python_name, None) field_value = __getattr(root, info.field_definition.python_name, None) if __callable(field_value): return field_value(context, info, **args) else: return field_value