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pydantic/docs/examples/schema_unenforced_constraints.py
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2020-05-31 14:54:12 +01:00

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Python

from pydantic import BaseModel, Field, PositiveInt
try:
# this won't work since PositiveInt takes precedence over the
# constraints defined in Field meaning they're ignored
class Model(BaseModel):
foo: PositiveInt = Field(..., lt=10)
except ValueError as e:
print(e)
# but you can set the schema attribute directly:
# (Note: here exclusiveMaximum will not be enforce)
class Model(BaseModel):
foo: PositiveInt = Field(..., exclusiveMaximum=10)
print(Model.schema())
# if you find yourself needing this, an alternative is to declare
# the constraints in Field (or you could use conint())
# here both constraints will be enforced:
class Model(BaseModel):
# Here both constraints will be applied and the schema
# will be generated correctly
foo: int = Field(..., gt=0, lt=10)
print(Model.schema())