Hyperlinks for pydantic models

Last update: Apr 18, 2022

Overview

Hyperlinks for pydantic models

In a typical web application relationships between resources are modeled by primary and foreign keys in a database (integers, UUIDs etc.). The most natural way to represent relationships in REST APIs is by URLs to the related resources (explained in this blog).

hrefs makes it easy to add hyperlinks between pydantic models in a declarative way. Just declare a Href field and the library will automatically convert between keys and URLs:

class Book(ReferrableModel):
    id: int

    class Config:
        details_view = "get_book"

class Library(BaseModel):
    books: List[Href[Book]]

@app.get("/library")
def get_library():
    # Will produce something like:
    # {"books":["http://example.com/books/1","http://example.com/books/2","http://example.com/books/3"]}
    return Library(books=[1,2,3]).json()

hrefs was written especially with FastAPI in mind, but integrates to any application or framework using pydantic to parse and serialize models.

Check out the documentation to get started!

Installation

Install the library using pip or your favorite package management tool:

$ pip install hrefs

Comments

`Href` JSON schema

The JSON schema of Href should be that of its URL type. Right now pydantic doesn't support examining subfields of generic models, but provided it did, the Href.__modify_schema__() method should be implemented to use that.

Re: https://github.com/samuelcolvin/pydantic/discussions/2902

opened by jasujm 0

Configurable key type

I would like to configure keys so that they could be called something else than just id. They could even be composite and support more complicated URL structures:

class Page(ReferrableModel):
    book: Href[Book]
    page_number: int

    class Config:
        details_view = "get_page"

@app.get("/books/{book_id}/pages/{page_number}", response_model=Page)
def get_page(book_id: UUID, page_number: int):
    ...

# Href[Page] would have key type consisting of (book_id, page_number): Tuple[UUID, int])

opened by jasujm 0

Self references
I would like to be able to write self href fields for models, so that they would be identified with URL in API responses:

class Book(ReferrableModel): self: Href[ForwardRef(Book)] Book.update_forward_refs()

I would like to populate the self reference from field that may not necessarily be self (i.e. the id field of the underlying database model)

The real primary key of the underlying (database) model doesn't appear in the model definition, so it needs to be configurable

Book(id=123) # this should work and produce -> {"self":"http://example.com/books/123"} or similar
opened by jasujm 0

Releases(0.5.1)

0.5.1(Mar 23, 2022)
Fixed

.readthedocs.yaml file syntax

Source code(tar.gz)
Source code(zip)
0.5(Mar 22, 2022)
Added

Implement Href.__hash__()

hypothesis build strategy for hyperlinks

hrefs.starlette.href_context() for setting things other than Starlette requests as hyperlink context

Source code(tar.gz)
Source code(zip)
0.4(Jan 17, 2022)
Added

Support Python 3.10

Changed

Use URL type in Href schema if using pydantic version 1.9 or later

Fixed

Require pydantic version 1.8 or later, since 1.7 doesn't work with the library

Source code(tar.gz)
Source code(zip)
0.3.1(Dec 29, 2021)
Added

Updated documentation about inheritance

Fixed

Minor documentation fixes

Add package metadata back to PKG-INFO

Source code(tar.gz)
Source code(zip)
0.3(Dec 27, 2021)
Added

tox for test automation

Support for hyperlinks as model keys

Changed

Replace get_key_type() and get_key_url() with parse_as_key() and parse_as_url(), respectively

Source code(tar.gz)
Source code(zip)
0.2(Dec 17, 2021)
Added

Implement Href.__modify_schema__()

Make it possible to configure model key by using hrefs.PrimaryKey annotation.

Changed

Split Referrable.href_types() into get_key_type() and get_url_type(), respectively

Source code(tar.gz)
Source code(zip)

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Hyperlinks for pydantic models

Related tags

Overview

Hyperlinks for pydantic models

Installation

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Comments

`Href` JSON schema

Configurable key type

Self references

Releases(0.5.1)

0.5.1(Mar 23, 2022)

0.5(Mar 22, 2022)

0.4(Jan 17, 2022)

0.3.1(Dec 29, 2021)

0.3(Dec 27, 2021)

0.2(Dec 17, 2021)

Owner

Jaakko Moisio

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