目前我有一個通用函數,你可以傳入一個屬性名和一個類(它也適用于特定的對象實例,但我正在使用類),該函數將通過調用查找并操作該屬性

getattr(model_class, model_attribute)

它將通過調用(此時在對象實例上)來修改屬性

settattr(model_obj,key,value)

但是,我有一個類,我們定義了@property方法而不是簡單屬性,并且setattr不起作用.如何基于該屬性方法的字符串名稱動態獲取@property？

也許我可以使用__dict__,但這看起來很臟而且不那么安全.

編輯：示例代碼

廣義函數

def process_general(mapping, map_keys, model_class, filter_fn, op_mode=op_modes.UPDATE):

"""

Creates or updates a general table object based on a config dictionary.

`mapping`: a configuration dictionary, specifying info about the table row value

`map_keys`: keys in the mapping that we use for the ORM object

`model_class`: the ORM model class we use the config data in

`op_mode`: the kind of operation we want to perform (delete, update, add, etc.)

Note that relationships between model objects must be defined and connected

outside of this function.

"""

# We construct a dictionary containing the values we need to set

arg_dict = make_keyword_args(map_keys, mapping)

# if we are updating, then we must first check if the item exists

# already

if (op_mode == op_modes.UPDATE):

# Find all rows that match by the unique token.

# It should only be one, but we will process all of them if it is the

# case that we didn't stick to the uniqueness requirement.

matches = filter_fn()

# Keep track of the length of the iterator so we know if we need to add

# a new row

num_results = 0

for match in matches:

# and we set all of the object attributes based on the dictionary

set_attrs_from_dict(match, arg_dict)

model_obj = match

num_results += 1

# We have found no matches, so just add a new row

if (num_results < 1):

model_obj = model_class(**arg_dict)

return model_obj

# TODO add support for other modes. This here defaults to add

else:

return model_class(**arg_dict)

傳入的示例類：

class Dataset(db.Model, UserContribMixin):

# A list of filters for the dataset. It can be built into the dataset filter form dict

# in get_filter_form. It's also useful for searching.

filters = db.relationship('DatasetFilter', backref='dataset')

# private, and retrieved from the @property = select

_fact_select = db.relationship('DatasetFactSelect', order_by='DatasetFactSelect.order')

@property

def fact_select(self):

"""

FIXME: What is this used for?

Appears to be a list of strings used to select (something) from the

fact model in the star dataset interface.

:return: List of strings used to select from the fact model

:rtype: list

"""

# these should be in proper order from the relationship order_by clause

sels = [sel.fact_select for sel in self._fact_select]

return sels

總結

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