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Added lazy_import to graphene. Fixed #316
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@ -43,6 +43,7 @@ if not __SETUP__:
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PageInfo
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)
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from .utils.resolve_only_args import resolve_only_args
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from .utils.module_loading import lazy_import
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__all__ = [
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'AbstractType',
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@ -72,4 +73,6 @@ if not __SETUP__:
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'ClientIDMutation',
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'Connection',
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'ConnectionField',
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'PageInfo']
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'PageInfo',
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'lazy_import',
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]
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26
graphene/utils/module_loading.py
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26
graphene/utils/module_loading.py
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@ -0,0 +1,26 @@
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from functools import partial
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from importlib import import_module
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def import_string(dotted_path):
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"""
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Import a dotted module path and return the attribute/class designated by the
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last name in the path. Raise ImportError if the import failed.
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"""
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try:
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module_path, class_name = dotted_path.rsplit('.', 1)
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except ValueError as err:
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raise ImportError("%s doesn't look like a module path" % dotted_path)
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module = import_module(module_path)
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try:
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return getattr(module, class_name)
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except AttributeError as err:
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raise ImportError('Module "%s" does not define a "%s" attribute/class' % (
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module_path, class_name)
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)
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def lazy_import(dotted_path):
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return partial(import_string, dotted_path)
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29
graphene/utils/tests/test_module_loading.py
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29
graphene/utils/tests/test_module_loading.py
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@ -0,0 +1,29 @@
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from pytest import raises
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from graphene import String
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from ..module_loading import lazy_import, import_string
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def test_import_string():
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MyString = import_string('graphene.String')
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assert MyString == String
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def test_import_string_module():
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with raises(Exception) as exc_info:
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import_string('graphenea')
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assert str(exc_info.value) == 'graphenea doesn\'t look like a module path'
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def test_import_string_class():
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with raises(Exception) as exc_info:
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import_string('graphene.Stringa')
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assert str(exc_info.value) == 'Module "graphene" does not define a "Stringa" attribute/class'
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def test_lazy_import():
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f = lazy_import('graphene.String')
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MyString = f()
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assert MyString == String
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