Add flask async view

[scottweitzner]

Description

MR to address issue #1903

Adds a new async-enabled view for use with Flask. This is specifically helpful when using async dataloaders to handle n+1 cases in your schema

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Documentation

Issues Fixed or Closed by This PR

#1903

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[botberry]

Thanks for adding the RELEASE.md file!

Here's a preview of the changelog:

---

This release adds a new flask view to allow for aysnc dispatching of requests.

This is especially useful when using dataloaders with flask.

from strawberry.flask.views import AsyncGraphQLView

...

app.add_url_rule("/graphql", view_func=AsyncGraphQLView.as_view("graphql_view", schema=schema, **kwargs))

---

Here's the preview release card for twitter:

Here's the tweet text:

🆕 Release (next) is out! Thanks to Scott Weitzner for the PR 👏

Get it here 👉 https://github.com/strawberry-graphql/strawberry/releases/tag/(next)

[codecov]

Codecov Report

Merging #1907 (2b45b61) into main (05c94ae) will decrease coverage by 0.13%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main    #1907      +/-   ##
==========================================
- Coverage   98.17%   98.04%   -0.14%     
==========================================
  Files         143      143              
  Lines        5530     5562      +32     
  Branches     1017     1023       +6     
==========================================
+ Hits         5429     5453      +24     
- Misses         50       56       +6     
- Partials       51       53       +2     

[patrick91]

Looks pretty good! Can you add some docs here? https://strawberry.rocks/docs/integrations/flask

then it will be ready to merge 😊

[scottweitzner]

@patrick91 Added a few more tests to get that coverage up and also added the docs. Thank you for making this an enjoyable process to contribute back. Looking forward to making more contributions down the line

[estyxx]

Thank you for this PR! I added a couple of comments :)

[patrick91]

Looks great! I took the liberty of applying @estyxx suggestions 😊 will merge in a bit :)

[botberry]

Thanks for contributing to Strawberry! 🎉 You've been invited to join
the Strawberry GraphQL organisation 😊

You can also request a free sticker by filling this form: https://forms.gle/dmnfQUPoY5gZbVT67

And don't forget to join our discord server: https://strawberry.rocks/discord 🔥

[scottweitzner]

Looks great! I took the liberty of applying @estyxx suggestions 😊 will merge in a bit :)

Thanks all!