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Name	Size	Permission
__pycache__	[ DIR ]	drwxr-xr-x
fields	[ DIR ]	drwxr-xr-x
functions	[ DIR ]	drwxr-xr-x
sql	[ DIR ]	drwxr-xr-x
__init__.py	2.46 KB	-rw-r--r--
aggregates.py	5.79 KB	-rw-r--r--
base.py	87.95 KB	-rw-r--r--
constants.py	117 B	-rw-r--r--
constraints.py	7.61 KB	-rw-r--r--
deletion.py	19.29 KB	-rw-r--r--
enums.py	2.69 KB	-rw-r--r--
expressions.py	51.01 KB	-rw-r--r--
indexes.py	11.02 KB	-rw-r--r--
lookups.py	22.76 KB	-rw-r--r--
manager.py	6.62 KB	-rw-r--r--
options.py	35.93 KB	-rw-r--r--
query.py	82.58 KB	-rw-r--r--
query_utils.py	12.38 KB	-rw-r--r--
signals.py	1.54 KB	-rw-r--r--
utils.py	1.57 KB	-rw-r--r--

Code Editor : utils.py

import functools
from collections import namedtuple

def make_model_tuple(model):
    """
    Take a model or a string of the form "app_label.ModelName" and return a
    corresponding ("app_label", "modelname") tuple. If a tuple is passed in,
    assume it's a valid model tuple already and return it unchanged.
    """
    try:
        if isinstance(model, tuple):
            model_tuple = model
        elif isinstance(model, str):
            app_label, model_name = model.split(".")
            model_tuple = app_label, model_name.lower()
        else:
            model_tuple = model._meta.app_label, model._meta.model_name
        assert len(model_tuple) == 2
        return model_tuple
    except (ValueError, AssertionError):
        raise ValueError(
            "Invalid model reference '%s'. String model references "
            "must be of the form 'app_label.ModelName'." % model
        )

def resolve_callables(mapping):
    """
    Generate key/value pairs for the given mapping where the values are
    evaluated if they're callable.
    """
    for k, v in mapping.items():
        yield k, v() if callable(v) else v

def unpickle_named_row(names, values):
    return create_namedtuple_class(*names)(*values)

@functools.lru_cache()
def create_namedtuple_class(*names):
    # Cache type() with @lru_cache() since it's too slow to be called for every
    # QuerySet evaluation.
    def __reduce__(self):
        return unpickle_named_row, (names, tuple(self))

return type(
        'Row',
        (namedtuple('Row', names),),
        {'__reduce__': __reduce__, '__slots__': ()},
    )

${this.title}

Code Editor : utils.py