MongoEngine Python 属性错误

Question

我正在尝试在我的应用程序中使用 mongodb，我制作了一个 Player Class 实例，例如：

class Player(mongoengine.Document):

def __init__(self,name=None,hschool=None,gradclass=None,position=None,
             height=None,weight=None,main_pos=None,side_pos=None,arm=None,
            extVelo=None,infieldVelo=None,outfieldVelo=None,popTime=None,
            catcherVelo=None,sixtyYard=None,fastBallVelo=None,maxfBallVelo=None,
            curveball=None,changeup=None,slider=None,splitter=None,cutter=None,
            knuckle=None,fork=None,profile_url=None):
     self._name = mongoengine.StringField()
    self.p_name = name
    self._hschool = mongoengine.StringField()
    self._gradclass = mongoengine.StringField()
    self._position = mongoengine.StringField()
    self._main_pos = mongoengine.StringField()
    self._side_pos = mongoengine.StringField()
    self._arm = mongoengine.StringField()
    self._height = mongoengine.StringField()
    self._weight = mongoengine.StringField()
    self._extVelo= mongoengine.StringField()
    self.heightFlag = False
    self._infieldVelo = mongoengine.StringField()
    self._outfieldVelo = mongoengine.StringField()
    self._popTime = mongoengine.StringField()
    self._catcherVelo = mongoengine.StringField()
    self._sixtyYard=mongoengine.StringField()
    self._fastBallVelo = mongoengine.StringField()
    self._maxfBallVelo = mongoengine.StringField()
    self._curveball = mongoengine.StringField()
    self._changeup = mongoengine.StringField()
    self._slider = mongoengine.StringField()
    self._splitter = mongoengine.StringField()
    self._cutter = mongoengine.StringField()
    self._knuckle = mongoengine.StringField()
    self._fork = mongoengine.StringField()
    self._profile_url = mongoengine.StringField()
    self.p_profile_url = profile_url

在此之后，我有播放器属性的 setter 和 getter，我将所有这些属性设置为字符串。完成所有这些之后，我想将这个 Player 实例保存到数据库中，以便以后可以访问它们。在我的主 python 文件中，我有这段代码：

def LoadData_click(url):
    p_arr=[]
    # javascript func for clearing the list here
    try:
        table1_string,table2_string,soup,page_title = get_data(url)
    except Exception as e:
        print(e)     
        return
    p_arr = get_roster(soup)
    print('button worked')
    for i,p in enumerate(p_arr):
        print(i+1/len(p_arr)*100)
        eel.progressBarUpdate(int((i+1)/len(p_arr)*100))
        set_position(p,table2_string)
        set_pitching(p,table1_string)
        set_link_props(p)
        p.save()
        # add Item to list
    return p_arr


if __name__ == "__main__":
    mongoengine.register_connection(alias='core',name='database')

当我运行主应用程序时，它给我以下错误：

File "c:\Users\tolga\Desktop\PlayerEditorJS\main.py", line 33, in LoadData_click p.save() File "C:\Python\lib\site-packages\mongoengine\document.py", line 369, in save self.validate(clean=clean) File "C:\Python\lib\site-packages\mongoengine\base\document.py", line 384, in validate self._data.get(name)) for name in self._fields_ordered] File "C:\Python\lib\site-packages\mongoengine\base\document.py", line 384, in self._data.get(name)) for name in self._fields_ordered] AttributeError: _dynamic_fields

Answer 1

这不是使用 MongoEngine 的方式，您的 class 必须继承自 Document 基础 class，如果您不这样做，您的 class 和实例将缺少 MongoEngine 正常工作所需的大部分内部构件。

编辑：您还必须将字段定义为 class 属性，而不是在构造函数中。这是因为 metaclass（Document 的）如何在幕后工作，它会在解释 class 时扫描您的 class 属性，这就是它期望的地方找到你的字段。

确保检查 readme and the docs

中的示例

例如：

from mongoengine import Document, StringField, IntField

class Player(Document):
    name = StringField()
    height = IntField()

MongoEngine Python 属性错误

MongoEngine Python AttributeError

python

mongodb

pymongo

mongoengine