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object_to_dict.py
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95 lines (79 loc) · 3.11 KB
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# -*- coding: utf-8 -*-
# @Time : 19-1-21 下午10:16
# @Author : ccs
from django.db.models import sql
from django.db.models.expressions import SQLiteNumericMixin, Expression
from django.db.models.query import ModelIterable
class ObjectToDict(object):
def __init__(self, model=None, query=None, using=None, hints=None):
self.model = model
self._db = using
self._hints = hints or {}
self.query = query or sql.Query(self.model)
self._result_cache = None
self._sticky_filter = False
self._for_write = False
self._prefetch_related_lookups = ()
self._prefetch_done = False
self._known_related_objects = {} # {rel_field: {pk: rel_obj}}
self._iterable_class = ModelIterable
self._fields = None
def _clone(self):
"""
Return a copy of the current QuerySet. A lightweight alternative
to deepcopy().
"""
#可见，这样可以将本类初始化参数全部赋给c对象，作为c的属性
c = self.__class__(model=self.model, query=self.query.chain(), using=self._db, hints=self._hints)
c._sticky_filter = self._sticky_filter
c._for_write = self._for_write
c._prefetch_related_lookups = self._prefetch_related_lookups[:]
c._known_related_objects = self._known_related_objects
c._iterable_class = self._iterable_class
c._fields = self._fields
return c
####obj对象通过.__dict__转换成字典
def _chain(self, **kwargs):
"""
Return a copy of the current QuerySet that's ready for another
operation.
"""
obj = self._clone()
if obj._sticky_filter:
obj.query.filter_is_sticky = True
obj._sticky_filter = False
obj.__dict__.update(kwargs)
return obj
###super初始化
class Func(SQLiteNumericMixin, Expression):
"""An SQL function call."""
function = None
template = '%(function)s(%(expressions)s)'
arg_joiner = ', '
arity = None # The number of arguments the function accepts.
def __init__(self, *expressions, output_field=None, **extra):
if self.arity is not None and len(expressions) != self.arity:
raise TypeError(
"'%s' takes exactly %s %s (%s given)" % (
self.__class__.__name__,
self.arity,
"argument" if self.arity == 1 else "arguments",
len(expressions),
)
)
super().__init__(output_field=output_field)
self.source_expressions = self._parse_expressions(*expressions)
self.extra = extra
class Aggregate(Func):
contains_aggregate = True
name = None
filter_template = '%s FILTER (WHERE %%(filter)s)'
window_compatible = True
def __init__(self, *args, filter=None, **kwargs):
self.filter = filter#将非公共参数直接在当前初始化
super().__init__(*args, **kwargs)##将公共参数放到基类初始化，
if __name__ == '__main__':
o_t_d =ObjectToDict()
c = o_t_d._clone()
print(c.__dir__())
print(c.__dict__)