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Get select with options (selectinload) using response schema #538

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ProgrammingStore opened this issue Jan 25, 2023 · 2 comments
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@ProgrammingStore
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ProgrammingStore commented Jan 25, 2023

First Check

  • I added a very descriptive title to this issue.
  • I used the GitHub search to find a similar issue and didn't find it.
  • I searched the SQLModel documentation, with the integrated search.
  • I already searched in Google "How to X in SQLModel" and didn't find any information.
  • I already read and followed all the tutorial in the docs and didn't find an answer.
  • I already checked if it is not related to SQLModel but to Pydantic.
  • I already checked if it is not related to SQLModel but to SQLAlchemy.

Commit to Help

  • I commit to help with one of those options 👆

Example Code

from pydantic import BaseModel

class Parent(SQLModel, table=True):
    id: UUID = sm.Field(UUID, primary_key=True)
    childs:List[Child]= sm.Relationship(
        back_populates="parent"
    )

class Child(SQLModel, table=True):
    parent_id:UUID=sm.Field()
        sa_column=sm.Column(
            sm.ForeignKey("parentr.id")
    )
    parent: "Parent" = sm.Relationship(
        back_populates="childs"
    )

#read schemas

class IChildRead(BaseModel):
    id:UUID

class IParentReadWithChilds(BaseModel):
    childs:List[IChildRead]

Description

What i want to get from pydantic response schema ? I want to get a query with select lazy options, using the schema of response, because this information already contains in relationships of pydantic models.
For example:
select(Parent).options(selectinload(Parent.Childs)),

The existance of property in pydantic model gives information about the need to use selectinload. Is there any solutions for it?

Operating System

Linux

Operating System Details

any

SQLModel Version

any

Python Version

any

Additional Context

any

@ProgrammingStore ProgrammingStore added the question Further information is requested label Jan 25, 2023
@ProgrammingStore ProgrammingStore changed the title Get select options (joinedload or selectinload) using response schema Get select options (selectinload) using response schema Jan 25, 2023
@ProgrammingStore ProgrammingStore changed the title Get select options (selectinload) using response schema Get select with options (selectinload) using response schema Jan 25, 2023
@cycledriver
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There are 2 ways to Child load with a selectin (or whatever type of lazy option):

  1. Define the lazyload option in your model:
    childs:List[Child]= sm.Relationship(
        back_populates="parent",
        sa_relationship_kwargs: {"lazyload": "selectin"},
    )

Whenever you select Parent objects, the children will always be loaded.

  1. At query time

If you want to be a bit more selective about when you do the selectin load, you can add it to the query:

from sqlalchemy.orm import selectinload

all_parents = session.exec(select(Parent).options(selectinload(Parent.childs)).all()

Pretty much anything you can do with the loads is described here:

https://docs.sqlalchemy.org/en/14/orm/loading_relationships.html

@Bewinxed
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There are 2 ways to Child load with a selectin (or whatever type of lazy option):

  1. Define the lazyload option in your model:
    childs:List[Child]= sm.Relationship(
        back_populates="parent",
        sa_relationship_kwargs: {"lazyload": "selectin"},
    )

Whenever you select Parent objects, the children will always be loaded.

  1. At query time

If you want to be a bit more selective about when you do the selectin load, you can add it to the query:

from sqlalchemy.orm import selectinload

all_parents = session.exec(select(Parent).options(selectinload(Parent.childs)).all()

Pretty much anything you can do with the loads is described here:

https://docs.sqlalchemy.org/en/14/orm/loading_relationships.html

Any way to use this without type errors? I'm getting this complaint when I use the selectinload

No overloads for "exec" match the provided argumentsPylance[reportCallIssue](https://github.com/microsoft/pyright/blob/main/docs/configuration.md#reportCallIssue)
session.py(50, 15): Overload 2 is the closest match
Argument of type "List[PersonaTrait]" cannot be assigned to parameter "keys" of type "_AttrType" in function "selectinload"
  Type "List[PersonaTrait]" is incompatible with type "_AttrType"
    "List[PersonaTrait]" is incompatible with "QueryableAttribute[Any]"
    "List[PersonaTrait]" is incompatible with type "Literal['*']"Pylance[reportArgumentType](https://github.com/microsoft/pyright/blob/main/docs/configuration.md#reportArgumentType)

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