[英]Insert an element into an array of nested model Mongodb with PyMongo on FASTAPI
Recently I stuck on inserting an element into an array that held by a parent document.最近,我坚持将一个元素插入到由父文档保存的数组中。 Basically, my model represents a train that can have many wagons.基本上,我的模型代表可以有许多货车的火车。 The wagons is an array that hold a wagon. wagons 是一个装有货车的阵列。
Here is my database model这是我的数据库模型
rom typing import Optional,Union
from pydantic import BaseModel, EmailStr, Field
#Wagon Model
class Wagon(BaseModel):
no: int = Field(...)
wagon_code: str = Field(...)
wagon_type: str = Field(...)
passengers_on_board: int = Field(...)
max_capacity: int = Field(...)
weight: float = Field(...)
dimension: tuple = Field(...)
class Config:
schema_extra = {
"example": {
"no": 3,
"wagon_code": "GA151-03",
"wagon_type": "Penumpang",
"passengers_on_board": 40,
"max_capacity":80,
"weight":1050.01,
"dimension": (20.62,9.91,4.15)
}
}
class UpdateWagon(BaseModel):
no: Optional[int]
wagon_code: Optional[str]
wagon_type: Optional[str]
passengers_on_board: Optional[int]
max_capacity: Optional[int]
weight: Optional[float]
dimension: Optional[tuple]
class Config:
schema_extra = {
"example": {
"no": 3,
"wagon_code": "GA151-03",
"wagon_type": "Penumpang",
"passengers_on_board": 64,
"max_capacity":80,
"weight":1050.01,
"dimension": (20.62,9.91,4.15)
}
}
#Train Model
class Train(BaseModel):
name: str = Field(...)
no: str = Field(...)
first_station: str = Field(...)
last_station: str = Field(...)
from_: str = Field(...)
to_: str = Field(...)
current_station: str = Field(...)
position: Optional[tuple]
wagons: Union[list[Wagon], None] = None
class Config:
schema_extra = {
"example": {
"name": "Gajayana",
"no": "GA-151",
"first_station": "Malang - Kota Baru",
"last_station": "Jakarta - Gambir",
"from_":"Malang - Kota Baru",
"to_":"Malang - Kota Lama",
"current_station":"Malang - Kota Baru",
"position": (2.12,2.12),
"wagons" : [],
}
}
class UpdateTrain(BaseModel):
name: Optional[str]
no: Optional[str]
first_station: Optional[str]
last_station: Optional[str]
from_: Optional[str]
to_: Optional[str]
current_station: Optional[str]
position: Optional[tuple]
wagons: Optional[list]
class Config:
schema_extra = {
"example": {
"name": "Gajayana",
"no": "GA-151",
"first_station": "Malang - Kota Baru",
"last_station": "Jakarta - Gambir",
"from_":"Malang - Kota Lama",
"to_":"Kepanjen",
"current_station":"Malang - Kota Baru",
"position": (2.08,2.16),
"wagons": [],
}
}
I was using arrayFilters
to attach the newly created wagon to the train.我正在使用arrayFilters
将新创建的货车附加到火车上。 However, I got no luck to attach the model but a new wagon was created as shown in the function below.但是,我没有运气附加模型,而是创建了一个新的货车,如下面的函数所示。
async def add_wagon(train_no: str,wagon_data: dict) -> dict:
wagon = await wagon_collection.insert_one(wagon_data)
new_wagon = await wagon_collection.find_one({"_id": wagon.inserted_id})
train = await train_collection.find_one({"no": train_no})
if train:
train_collection.update_one({"no": train_no},{"$set":{"wagons.$[element]":new_wagon}},array_filters=[{"element":{"$exists":"false"}}],upsert=True)
return wagon_helper(new_wagon)
The model was served as an API with FASTAPI.该模型作为 API 与 FASTAPI 一起使用。 The operation above was done using PUT method with the route as shown below.上面的操作是使用 PUT 方法完成的,路径如下所示。
@router.put("{train_no}/wagons/", response_description="Wagon data added into the database")
async def add_wagon_data(train_no: str,wagon: Wagon = Body(...)):
wagon = jsonable_encoder(wagon)
new_wagon = await add_wagon(train_no,wagon)
return ResponseModel(new_wagon, "Wagon added successfully")
Is my arrayFilters
is wrong ?我的arrayFilters
错了吗? or is the way I use $exists
as exact equality match is incorrect ?还是我使用$exists
作为完全相等匹配的方式不正确?
It turns out I was thinking too complicated.原来我想的太复杂了。 USing $push
with upsert=True
solve the problem.使用$push
和upsert=True
解决问题。
async def add_wagon(train_no: str,wagon_data: dict) -> dict:
wagon = await wagon_collection.insert_one(wagon_data)
new_wagon = await wagon_collection.find_one({"_id": wagon.inserted_id})
train = await train_collection.find_one({"no": train_no})
if train:
train_collection.update_one({"no": train_no},{"$push":{"wagons":new_wagon}},upsert=True)
return wagon_helper(new_wagon)
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