Implement Mechanism to Selectively Override Automatic Field Creations

[jnak]

This implements the overriding mechanism discussed in #209.

Changes include:

• Add ORMField class
• The main overridable parameters are: type, description, deprecation_reason and required
• We can name fields differently using prop_name. This was preferred over name to avoid confusion / collision with graphene.Field parameters.
• Add tests for all types of SQLAlchemy properties: columns, relationships, column properties, hybrid properties and and composite properties.
• Cleanups and re-organize some tests.

TODOs that I'm planning to address as soon as this PR is merged:

• Add a way to override relationship types.
• Add a way to override composite fields default parameters.
• Add example and documentation

[coveralls]

Coverage increased (+3.1%) to 97.093% when pulling 36675c0 on jnak:saot-override into 8ad1f75 on graphql-python:master.

[jnak]

FYI I moved those tests to test_types.py because it was not clear where to add new tests.

[jnak]

Thanks for the feedback @wyattanderson!

[wyattanderson]

LGTM

[Nabellaleen]

Soooooo nice !

Add documentation would be very nice, to see a "how to" automatically integrated to the website published documentation.
Do you plan to do it in another PR ? Otherwise, could you add it in this one ?

[Nabellaleen]

Is there a reason to "de-name" the query here ?

[jnak]

There was no reason to name the query so I removed to make tests more consistent and simple.

[Nabellaleen]

Why ? ;)

[jnak]

I realized that was not needed because the global registry is reset between tests (see confest.py).

[jnak]

@Nabellaleen Thanks for the review!

For now, I've added detailed docstrings witth examples to ORMField. I'm planning to add proper documentation in an upcoming PR once I'm done relationships and hybrid overriding (see my first comment on this thread).

Cheers

[jnak]

There was no reason to name the query so I removed to make tests more consistent and simple.

[jnak]

I realized that was not needed because the global registry is reset between tests (see confest.py).