Define the Models for implementing Quizzes (collections of Questions) and their
Responses (collections of Answers to those Questions). These Models would
form the basis of storage for such items as:
Terms of Service (Quiz)
Question ("I agree...")
Response -> Answer (answer to "I agree..." confirmation)
solution ("Yes" Answer to the "I agree..." Question)
Mentor and Student surveys (Quiz)
Questions (including "Pay this student?")
Response -> Answers
solution ("Yes" Answer to the "Pay this student?" Question)
Organization applications
Student Proposal review, comment, and scoring system
GHOP task tracking (a specific task list item would be a Quiz)
Patch by: Todd Larsen
Review by: Pawel Solyga, Sverre Rabbelier, Chen Lunpeng
Review URL: http://codereviews.googleopensourceprograms.com/1403
"""
Various data structures used in query construction.
Factored out from django.db.models.query so that they can also be used by other
modules without getting into circular import difficulties.
"""
from copy import deepcopy
from django.utils import tree
class QueryWrapper(object):
"""
A type that indicates the contents are an SQL fragment and the associate
parameters. Can be used to pass opaque data to a where-clause, for example.
"""
def __init__(self, sql, params):
self.data = sql, params
class Q(tree.Node):
"""
Encapsulates filters as objects that can then be combined logically (using
& and |).
"""
# Connection types
AND = 'AND'
OR = 'OR'
default = AND
def __init__(self, *args, **kwargs):
super(Q, self).__init__(children=list(args) + kwargs.items())
def _combine(self, other, conn):
if not isinstance(other, Q):
raise TypeError(other)
obj = deepcopy(self)
obj.add(other, conn)
return obj
def __or__(self, other):
return self._combine(other, self.OR)
def __and__(self, other):
return self._combine(other, self.AND)
def __invert__(self):
obj = deepcopy(self)
obj.negate()
return obj
def select_related_descend(field, restricted, requested):
"""
Returns True if this field should be used to descend deeper for
select_related() purposes. Used by both the query construction code
(sql.query.fill_related_selections()) and the model instance creation code
(query.get_cached_row()).
"""
if not field.rel:
return False
if field.rel.parent_link:
return False
if restricted and field.name not in requested:
return False
if not restricted and field.null:
return False
return True