47 lines
1.3 KiB
Markdown
47 lines
1.3 KiB
Markdown
---
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title: Using Enums and Literals in Pydantic for Role Management
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description: Learn how to implement Enums and Literals in Pydantic to manage standardized user roles with a fallback option.
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---
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To prevent data misalignment, we can use Enums for standardized fields. Always include an "Other" option as a fallback so the model can signal uncertainty.
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```python hl_lines="7 12"
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from pydantic import BaseModel, Field
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from enum import Enum
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class Role(Enum):
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PRINCIPAL = "PRINCIPAL"
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TEACHER = "TEACHER"
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STUDENT = "STUDENT"
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OTHER = "OTHER"
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class UserDetail(BaseModel):
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age: int
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name: str
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role: Role = Field(
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description="Correctly assign one of the predefined roles to the user."
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)
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```
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If you're having a hard time with `Enum` an alternative is to use `Literal` instead.
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```python hl_lines="4"
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from typing import Literal
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from pydantic import BaseModel
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class UserDetail(BaseModel):
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age: int
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name: str
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role: Literal["PRINCIPAL", "TEACHER", "STUDENT", "OTHER"]
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```
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## See Also
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- [Types](./types.md) - Working with different data types including Literal
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- [Union Types](./unions.md) - Using unions with enums for multiple choices
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- [Response Models](./models.md) - Using enums in Pydantic models
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- [Fields](./fields.md) - Customizing enum fields with Field metadata
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