Added base usage example for aiohttp server

[rudyryk]

Simple example of usage with aiohttp server with GET and POST requests.

Btw, Manager.update() seems to be broken. I'd want to restore it first and then go with smooth deprecation process if (really) necessary. Hopefully I'll be able to prepare the next pull request soon.

Hi @kalombos :) Thank you for being such an active contributor and maintaner! Please take a look at this PR.

[kalombos]

Hi @rudyryk Glad to see you :) I totally agree there should be smooth deprecation process but are you sure Manager.update() is broken? Because the tests have passed and i did not change this part of code.

In our projects we created BaseModel classes similiar to AioModel It's more convinient to use such class instead of the Manager. So i decided to create AioModel class with async versions of peewee.Model methods. These methods should have the same name like in peewee with prefix aio and provide the same functionality. When the AioModel class is ready, the Manager class will just repeat its functionality. All Manager methods will be proxy-methods like this one. That's why i decided to make it deprecated. The only unique functionality the Manager has is database swap. I don't know how to use it :) And i thought it is for very rare cases so i decided to remove it in the future.

I will review your PR in a couple of days

[rudyryk]

but are you sure Manager.update() is broken?

It's not completely broken but now it requires models to be subclassed from AioMode. Actually the original intention of having the Manager was the ability to work without changing models hierarchy.

But I guess no big problem here, I've almost prepared a new PR with compatibility module extracted + tests.

[rudyryk]

Manager extracted to compatibility module in PR #232

[rudyryk]

This is first PR in a chain:

• Added base usage example for aiohttp server #231
• Extracted compatibility module to work without AioModel subclassing #232
• Removed AsyncDatabase.fetch_results() + compat logic updated #233