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🚀🌠 Tremendous Traffic: 10M - 20M visitors per month


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Prices on github.com are in US Dollars ($). They range from $4.00/month to $21.00/month.
We estimate that the site has approximately 4,989,889 paying customers.
The estimated monthly recurring revenue (MRR) is $20,957,532.
The estimated annual recurring revenues (ARR) are $251,490,385.

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Keywords {🔍}

import, pydantic, schema, description, children, question, samuelcolvin, generic, issue, node, sign, recursion, class, generict, listnodet, nodes, error, type, commented, issues, models, umvarma, python, navigation, open, code, pull, requests, discussions, actions, security, errors, selfreferencing, closed, version, shown, future, annotations, basemodel, typing, list, typevar, pydanticgenerics, genericmodel, typevart, nodegenericmodel, nodeupdateforwardrefs, treegenericmodel, top, level,

Topics {✒️}

completed samuelcolvin mentioned open issues lyz-code mentioned samuelcolvin closed pydantic import basemodel comment metadata assignees __future__ import annotations typing import list pydantic version n1 = node[str] generics import genericmodel referencing models n0 = node[int] n2 = node[int] import pydantic discussions 👉 question discussion list[node] = schema description = 'node python object code tree[int] nodes = [n0] issues node type node[int] list[node[ list[node] class tree type projects [] issue children type children = [n1 class node conda-forge greatly appreciated projects milestone milestone relationships question python error disappers validation error feel free github pydantic nodes node generic generic[ n2]

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Questions {❓}

• @dmontagu any idea?
• Already have an account?
• Any news on this?
• I have also encountered this issue - @umvarma did you find a workaround?

Schema {🗺️}

DiscussionForumPosting:
      context:https://schema.org
      headline:Recursion errors for self-referencing generic models
      articleBody:# Question Output of `python -c "import pydantic.utils; print(pydantic.utils.version_info())"`: ``` pydantic version: 1.4 pydantic compiled: False install path: F:\Software\Miniconda3\Lib\site-packages\pydantic python version: 3.7.6 | packaged by conda-forge | (default, Jan 7 2020, 21:48:41) [MSC v.1916 64 bit (AMD64)] platform: Windows-10-10.0.18362-SP0 optional deps. installed: [] ``` ## Issue I wrote a generic model named Tree as shown in the following snippet. ```py from __future__ import annotations from pydantic import BaseModel, Schema from typing import List, Generic, TypeVar from pydantic.generics import GenericModel T = TypeVar('T') class Node(GenericModel, Generic[T]): value: T = Schema(..., description = 'Node value') children: List[Node[T]] = Schema([], description = 'Node children') Node.update_forward_refs() class Tree(GenericModel, Generic[T]): nodes: List[Node[T]] = Schema([], description = 'Top level nodes') ``` I get the error "maximum recursion depth exceeded while calling a Python object" when I try to use it. Any suggestions on how I can fix this would be greatly appreciated. If I modify the Node.children type from List[Node[T]] to List[Node], then the error disappers. ```py from __future__ import annotations from pydantic import BaseModel, Schema from typing import List, Generic, TypeVar from pydantic.generics import GenericModel T = TypeVar('T') class Node(GenericModel, Generic[T]): value: T = Schema(..., description = 'Node value') children: List[Node] = Schema([], description = 'Node children') Node.update_forward_refs() class Tree(GenericModel, Generic[T]): nodes: List[Node[T]] = Schema([], description = 'Top level nodes') ``` The problem in this case is that, it accepts any Node type as the children as shown in the following code. ```py n1 = Node[str](value = "j") n2 = Node[int](value = 2) n0 = Node[int](value = 0, children = [n1, n2]) Tree[int](nodes = [n0]).dict() ``` I want it to support only `Node[int]` as children, and I want it throw a validation error in the above case.
      author:
         url:https://github.com/umvarma
         type:Person
         name:umvarma
      datePublished:2020-03-27T06:56:08.000Z
      interactionStatistic:
         type:InteractionCounter
         interactionType:https://schema.org/CommentAction
         userInteractionCount:4
      url:https://github.com/1345/pydantic/issues/1345
      context:https://schema.org
      headline:Recursion errors for self-referencing generic models
      articleBody:# Question Output of `python -c "import pydantic.utils; print(pydantic.utils.version_info())"`: ``` pydantic version: 1.4 pydantic compiled: False install path: F:\Software\Miniconda3\Lib\site-packages\pydantic python version: 3.7.6 | packaged by conda-forge | (default, Jan 7 2020, 21:48:41) [MSC v.1916 64 bit (AMD64)] platform: Windows-10-10.0.18362-SP0 optional deps. installed: [] ``` ## Issue I wrote a generic model named Tree as shown in the following snippet. ```py from __future__ import annotations from pydantic import BaseModel, Schema from typing import List, Generic, TypeVar from pydantic.generics import GenericModel T = TypeVar('T') class Node(GenericModel, Generic[T]): value: T = Schema(..., description = 'Node value') children: List[Node[T]] = Schema([], description = 'Node children') Node.update_forward_refs() class Tree(GenericModel, Generic[T]): nodes: List[Node[T]] = Schema([], description = 'Top level nodes') ``` I get the error "maximum recursion depth exceeded while calling a Python object" when I try to use it. Any suggestions on how I can fix this would be greatly appreciated. If I modify the Node.children type from List[Node[T]] to List[Node], then the error disappers. ```py from __future__ import annotations from pydantic import BaseModel, Schema from typing import List, Generic, TypeVar from pydantic.generics import GenericModel T = TypeVar('T') class Node(GenericModel, Generic[T]): value: T = Schema(..., description = 'Node value') children: List[Node] = Schema([], description = 'Node children') Node.update_forward_refs() class Tree(GenericModel, Generic[T]): nodes: List[Node[T]] = Schema([], description = 'Top level nodes') ``` The problem in this case is that, it accepts any Node type as the children as shown in the following code. ```py n1 = Node[str](value = "j") n2 = Node[int](value = 2) n0 = Node[int](value = 0, children = [n1, n2]) Tree[int](nodes = [n0]).dict() ``` I want it to support only `Node[int]` as children, and I want it throw a validation error in the above case.
      author:
         url:https://github.com/umvarma
         type:Person
         name:umvarma
      datePublished:2020-03-27T06:56:08.000Z
      interactionStatistic:
         type:InteractionCounter
         interactionType:https://schema.org/CommentAction
         userInteractionCount:4
      url:https://github.com/1345/pydantic/issues/1345
Person:
      url:https://github.com/umvarma
      name:umvarma
      url:https://github.com/umvarma
      name:umvarma
InteractionCounter:
      interactionType:https://schema.org/CommentAction
      userInteractionCount:4
      interactionType:https://schema.org/CommentAction
      userInteractionCount:4

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