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import itertools
from packaging.version import Version
import rest_framework
from rest_framework_extensions.key_constructor.constructors import (
DefaultKeyConstructor,
DefaultObjectKeyConstructor,
DefaultListKeyConstructor,
DefaultAPIModelInstanceKeyConstructor,
DefaultAPIModelListKeyConstructor
)
from rest_framework_extensions.settings import extensions_api_settings
def get_rest_framework_version():
return Version(rest_framework.VERSION).release
def flatten(list_of_lists):
"""
Takes an iterable of iterables,
returns a single iterable containing all items
"""
# todo: test me
return itertools.chain(*list_of_lists)
def prepare_header_name(name):
"""
>> prepare_header_name('Accept-Language')
http_accept_language
"""
return 'http_{0}'.format(name.strip().replace('-', '_')).upper()
def get_unique_method_id(view_instance, view_method):
# todo: test me as UniqueMethodIdKeyBit
return '.'.join([
view_instance.__module__,
view_instance.__class__.__name__,
view_method.__name__
])
def get_model_opts_concrete_fields(opts):
# todo: test me
if not hasattr(opts, 'concrete_fields'):
opts.concrete_fields = [f for f in opts.fields if f.column is not None]
return opts.concrete_fields
def compose_parent_pk_kwarg_name(value):
return '{0}{1}'.format(
extensions_api_settings.DEFAULT_PARENT_LOOKUP_KWARG_NAME_PREFIX,
value
)
default_cache_key_func = DefaultKeyConstructor()
default_object_cache_key_func = DefaultObjectKeyConstructor()
default_list_cache_key_func = DefaultListKeyConstructor()
default_etag_func = default_cache_key_func
default_object_etag_func = default_object_cache_key_func
default_list_etag_func = default_list_cache_key_func
# API (object-centered) functions
default_api_object_etag_func = DefaultAPIModelInstanceKeyConstructor()
default_api_list_etag_func = DefaultAPIModelListKeyConstructor()
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