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Hello, new to Pydantic & FastAPI - I have an Enum: Which I use to define a Model such as: And I have a request hander that looks like: When I submit a POST to my handler, that looks like: I receive the following error: How should I be better handling this to map whatever strings (colors in this case) to the correct Enum values to be validated? Thank you in advance |
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Replies: 3 comments 1 reply
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This can be resolved. I ended up moving this changing my Palette color attribute to be that of type string, but still handle the type checking at the validator which seems to work fine. |
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You can have no validator at all 😃 This works fine and converts the JSON strings into the corresponding enum members: from enum import Enum
from fastapi import FastAPI
from pydantic import BaseModel
class ColorEnum(str, Enum):
orange = "orange"
red = "red"
green = "green"
class Palette(BaseModel):
colors: list[ColorEnum]
app = FastAPI()
@app.post("/create")
def create_palette(item: Palette):
print(item)
print(item.colors)With the body you showed, this prints It also handles invalid enum members, for example if you post {
"detail": [
{
"loc": [
"body",
"colors",
0
],
"msg": "value is not a valid enumeration member; permitted: 'orange', 'red', 'green'",
"type": "type_error.enum",
"ctx": {
"enum_values": [
"orange",
"red",
"green"
]
}
}
]
} |
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This is what I have, and works just like you explained. But now I'm having trouble with the objects I'm getting in my request function as I'm trying to put it directly into my database. My model column: status: Mapped[SwipeSessionEnum] = mapped_column(
default=SwipeSessionEnum.IN_PROGRESS
)My schema: status: SwipeSessionEnum = SwipeSessionEnum.IN_PROGRESSMy enum: class SwipeSessionEnum(str, BaseEnum):
PAUSED = "Gepauzeerd"
CANCELLED = "Gestopt"
IN_PROGRESS = "Is bezig"
COMPLETED = "Voltooid"My error: It seems to be putting in the enum object instead of just its value? EDIT: I fixed it by adding the |
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@brymon68 Have you tried using the
class Palette(BaseModel):
colors: List[ColorEnum]
class Config:
use_enum_values = TrueYou could also use a class Palette(BaseModel):
colors: List[Literal["orange", "red", "green"]] |
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This can be resolved. I ended up moving this changing my Palette color attribute to be that of type string, but still handle the type checking at the validator which seems to work fine.