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SQLModel example: Unique constraint over multiple columns

In the following example, we create a Unique constraint over multiple columns (seller and url) in SQLModel.

sqlmodel_unique_constraint.py
from sqlmodel import SQLModel, Field, UniqueConstraint

class Offer(SQLModel, table=True):
    id: Optional[int] = Field(default=None, primary_key=True)
    seller: str = Field(description="Name of the seller")
    url: str = Field(description="URL to the product page for this seller")

    __table_args__ = (
        UniqueConstraint('seller', 'url', name='unique_seller_url'),
    )

You can choose the name parameter of UniqueConstraint to your liking. It’s used to name the constraint in the database.

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