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fix: pydantic dataclass can inherit from stdlib dataclass and arbitrary_types_allowed
is supported
#2051
Merged
samuelcolvin
merged 4 commits into
pydantic:master
from
PrettyWood:fix/dataclass_inheritance
Oct 28, 2020
+143
−6
Merged
fix: pydantic dataclass can inherit from stdlib dataclass and arbitrary_types_allowed
is supported
#2051
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c4e825a
fix: pydantic dataclasses can inherit from stdlib dataclasses
PrettyWood c58afee
docs: add some documentation
PrettyWood 86aaff2
fix: support arbitrary_types_allowed with stdlib dataclass
PrettyWood b4cd195
docs: add documentation for custom types
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,2 @@ | ||
fix: _pydantic_ `dataclass` can inherit from stdlib `dataclass` | ||
and `Config.arbitrary_types_allowed` is supported |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,42 @@ | ||
import dataclasses | ||
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import pydantic | ||
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class ArbitraryType: | ||
def __init__(self, value): | ||
self.value = value | ||
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def __repr__(self): | ||
return f'ArbitraryType(value={self.value!r})' | ||
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@dataclasses.dataclass | ||
class DC: | ||
a: ArbitraryType | ||
b: str | ||
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# valid as it is a builtin dataclass without validation | ||
my_dc = DC(a=ArbitraryType(value=3), b='qwe') | ||
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try: | ||
class Model(pydantic.BaseModel): | ||
dc: DC | ||
other: str | ||
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Model(dc=my_dc, other='other') | ||
except RuntimeError as e: # invalid as it is now a pydantic dataclass | ||
print(e) | ||
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class Model(pydantic.BaseModel): | ||
dc: DC | ||
other: str | ||
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class Config: | ||
arbitrary_types_allowed = True | ||
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m = Model(dc=my_dc, other='other') | ||
print(repr(m)) |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,27 @@ | ||
import dataclasses | ||
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import pydantic | ||
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@dataclasses.dataclass | ||
class Z: | ||
z: int | ||
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@dataclasses.dataclass | ||
class Y(Z): | ||
y: int = 0 | ||
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@pydantic.dataclasses.dataclass | ||
class X(Y): | ||
x: int = 0 | ||
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foo = X(x=b'1', y='2', z='3') | ||
print(foo) | ||
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try: | ||
X(z='pika') | ||
except pydantic.ValidationError as e: | ||
print(e) |
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we should also add a comment about the
arbitrary_types_allowed
logic change since that now behaves different from nested pydantic dataclasses or next pydantic models.