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Keywords {🔍}

model, models, fields, koliyo, issue, class, samuelcolvin, pydantic, reconstructed, base, field, foo, feat, avoid, reconstructing, sign, inherited, cfoo, commented, mentioned, prettywood, import, basemodel, printfc, bhello, author, type, return, added, feature, navigation, open, pull, requests, actions, security, closed, subclass, validator, foobasemodel, int, foosubfoo, str, containerbasemodel, foosuba, containerfoofs, printffs, idfs, printfcfoo, idcfoo,

Topics {✒️}

utility decorator/type declaration 548b336 samuelcolvin closed 4da511e prettywood mentioned issue open avoid reconstructing models integrate pydantic basemodels pydantic import basemodel inherited models subclass members intact special flag/configuration comment metadata assignees python type hinting base-class model covariant return types samuelcolvin mentioned main field-api feature packaged base model child models custom validators type projects class foosub custom decorator foosub instance c1 = container explicitly list supported subclasses good idea documented usage origially provided projects milestone milestone relationships fs = foosub c2 = container return cls a5b51bc feat e189506 feat pydantic f'fs prints fs nested basemodel f'c1 current behaviour gmso github f'c2 dict_validator foo=fs assigned validate

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• Already have an account?
• Could this be solved with some custom decorator perhaps?
• Does Python type hinting allow covariant return types?
• How can I achieve this?
• Question/Bug(?
• There might be some construct for this using Generic and/or TypeVar?

Schema {🗺️}

DiscussionForumPosting:
      context:https://schema.org
      headline:Inherited models as fields are reconstructed as base model
      articleBody:I have a model which has a field of a another base-class model. I want this field to be able to contain any sub-class of this model. But when I assign to this field it gets reconstructed to the base model. ```py from pydantic import BaseModel, validator, PyObject, ValidationError, BaseConfig class Foo(BaseModel): a: int class FooSub(Foo): b: str class Container(BaseModel): foo: Foo f = Foo(a=1) c1 = Container(foo=f) # print(f'c1: {c1}') fs = FooSub(a=2, b='hello') c2 = Container(foo=fs) # print(f'c2: {c2}') print(f'fs: {fs} (id: {id(fs)})') print(f'c2.foo: {c2.foo} ({id(c2.foo)})') ``` this prints ``` fs: FooSub a=2 b='hello' (id: 4566162824) c2.foo: Foo a=2 (4566162696) ``` What I want is `c2.foo` to be the `FooSub` instance I created and assigned. How can I achieve this? I have tried using custom validators, but without success.
      author:
         url:https://github.com/koliyo
         type:Person
         name:koliyo
      datePublished:2018-09-20T06:11:05.000Z
      interactionStatistic:
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      url:https://github.com/265/pydantic/issues/265
      context:https://schema.org
      headline:Inherited models as fields are reconstructed as base model
      articleBody:I have a model which has a field of a another base-class model. I want this field to be able to contain any sub-class of this model. But when I assign to this field it gets reconstructed to the base model. ```py from pydantic import BaseModel, validator, PyObject, ValidationError, BaseConfig class Foo(BaseModel): a: int class FooSub(Foo): b: str class Container(BaseModel): foo: Foo f = Foo(a=1) c1 = Container(foo=f) # print(f'c1: {c1}') fs = FooSub(a=2, b='hello') c2 = Container(foo=fs) # print(f'c2: {c2}') print(f'fs: {fs} (id: {id(fs)})') print(f'c2.foo: {c2.foo} ({id(c2.foo)})') ``` this prints ``` fs: FooSub a=2 b='hello' (id: 4566162824) c2.foo: Foo a=2 (4566162696) ``` What I want is `c2.foo` to be the `FooSub` instance I created and assigned. How can I achieve this? I have tried using custom validators, but without success.
      author:
         url:https://github.com/koliyo
         type:Person
         name:koliyo
      datePublished:2018-09-20T06:11:05.000Z
      interactionStatistic:
         type:InteractionCounter
         interactionType:https://schema.org/CommentAction
         userInteractionCount:4
      url:https://github.com/265/pydantic/issues/265
Person:
      url:https://github.com/koliyo
      name:koliyo
      url:https://github.com/koliyo
      name:koliyo
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      interactionType:https://schema.org/CommentAction
      userInteractionCount:4
      interactionType:https://schema.org/CommentAction
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