django-utils.py

# filter_by :: [Kwarg] -> lambda QuerySet
def filter_by(**kwargs):
  return lambda qs: qs.filter(**kwargs)


# filter_by_type :: QuerySet -> QuerySet
filter_by_type = lambda x: filter_by(type=x)


# filter_by_project :: QuerySet -> QuerySet
filter_projects = filter_by_type(Account.PROJECT_TYPE)


# filter_by_unit :: QuerySet -> QuerySet
filter_by_unit = filter_by_type(Account.UNIT_TYPE)


# get_descendants :: QuerySet -> QuerySet
get_descendants = lambda qs: qs.get_descendants()


# get_ancestors :: QuerySet -> QuerySet
get_ancestors = lambda qs: qs.get_ancestors()


# distinct :: QuerySet -> QuerySet
distinct = lambda qs: qs.disctinct()


# first_project :: QuerySet -> Account
first_project = compose(head, filter_projects)
first_project = compose(head, filter_by(type='PROJECT'))

get_uppercase_name = compose(upper, prop('name'))

capitalised_names = compose(fmap(get_uppercase_name), filter_by(type=Account.CONSTRUCTION_TYPE))

# first_project_children :: QuerySet -> QuerySet
first_project_children = compose(filter_projects, get_descendants, first_project)